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FAQ

co2 extraction system

1.What is the maximum capacity (kg dry flower) in the feeding tank? Are there 1 or 2 tanks?

The amount of feed depends on the specific gravity of the dried flowers. If the specific gravity is 0.3, the weight of the load is equal to the volume * 0.3

What is the capacity (lts) of the collection tanks?

Let's take the following two models as examples

SCF220-40-01 equipment collection tank capacity is 0.6L 2 Sets

SCF220-40-05 equipment collection tank capacity equipment collection tank capacity is 2L & 1L

3.Does the equipment use liquid or gaseous CO2?

The intake air of the equipment is gaseous CO 2 , and the carbon dioxide is turned into a liquid state through a refrigeration system, and then injected into the extraction vessel through a CO2 high-pressure pump to become a supercritical state, which is turned into a gaseous state by depressurization, and the extracted product CO2 is separated. The kettle is separated, enters the secondary separation through decompression, and finally enters the circulation pipeline to enter the CO2 storage tank, enters the CO2 high pressure pump, and is recycled.

4.Does the equipment has a CO2 recovery system?5.If so, then what is it your capacity?

Equipment recycling can recover part of the carbon dioxide, only about 4MPa can be recovered, and the recovery pump can be selected to improve the recovery efficiency, generally recovering 0.5MPa.

6.If so, then how many recovery tanks does the equipment has?7.What is the capacity of the recovery system tanks?

Recycling can be recycled into CO2 storage tanks and CO2 empty bottles without the need to add recycling tanks.

8.Does the equipment have a CO2 recirculation system to the process?

The equipment is CO2 circulating work, environmental protection and energy saving, but it is necessary to empty the unrecoverable pressure when unloading.

9.What is the performances Of the equipment? (specify performance units kg / hr))

Here we take a 1L device as an example:Recycling of 15Nm3 / h

10. What is the CO2 flow (lts / hr?)

Is the flow of CO2 circulating during the extraction process.

11.Is it possible that the extraction equipment (all its parts) could be built in selected materials?

Mainly preferet 316 stainless steelThe conventional one is S30408, and 316 stainless steel can be selected according to requirements.

12.What is the brand of equipment gaskets?

The washer is a spring seal made of PTFE and is developed by us.

13.What is the exact external size of the instaled equipment? H*W*D

When the 1L device is 2500×2000×2000 m/m, the operation space is added, and when the 5L device is 2800×2500×2000 m/m, the operation space is added.

14.What is the performance of the spare parts?

We have more than 30 years of experience in the production of supercritical extraction equipment.All parts development has been confirmed by our practice, their quality and performance are reliable

15.How long can a full extraction process take?

Cannabis is usually about 2 hours

17.What and how many security systems does the equipment has?

A total of 4 safety protection valves, CO2 high pressure pump with electronic upper limit protection device

18.Which and how are the equipment control systems?

The temperature control can be controlled by a pressure control system, and the temperature is adjusted by a PID control solid state relay. The pressure is controlled by a back pressure valve.

19.What are the minimum yields (kg / hr?) reached by the equipment specifically on the extraction of cannabis?

Since cannabis is a contraband in China, we do not have detailed data. According to our experience, 1L equipment loading is about 0.3 kg, and 5L equipment loading is about 1.5 kg.

20.what is the expected useful life of the equipment and all its parts?

More than 10 years

21.Is it posible for you to send some one specialized on the equipment to train the end user? how much will it cost?, we could pay for air tickets, hotel full food transport and will you be able to making for free?

Yes, you need to pay for airline tickets, meals and hotel expenses.

Salary $100/day

22.what coolant system the equipment use?Does it comes with a chiller included? what is it's brand?

R407 refrigeration parts chiller, Chinese brand.

23. What is the pressure size volum and capacity of the CO2 tanks that we need to buy to fits the equipment requirements (SCF 220-40-01 )?

40L, cylinder net weight 22 kg

23. What is the pressure size volum and capacity of the CO2 tanks that we need to buy to fits the equipment requirements (SCF 220-40-01 )?

40L, cylinder net weight 22 kg

24. How many extraction processes could be completed with your recommended CO2 tank WITHOUT recovery and without recirculation? How many extraction processes could be completed with your recommended CO2 tank WITH recovery and with recirculation?

1L equipment A bottle of CO2 is about 2-3 batch samples.

1L-10L equipment is not recommended to increase the recovery pump to recover CO2.

25.What are the storage conditions of CO2 tanks?

Stored in a gas cabinet

26.Which safety system has the equipment for handling CO2 tanks, leaks of pressure, ...?

The carbon dioxide tank has a safety release hole for safety. The nozzle adopts a high-pressure sealing structure and has no leakage.

28.Which or what extra external security system should be installed to avoid danger in the eviroment of the instaled the equipment

As far as our system is concerned, you don't need other security measures.But you may need other routine protection measures: for example, the workplace must be clean, ventilated, etc.

29.Does the equipment have a GMP certificate?

We are implementing Chinese standards.

However, we can produce according to GMP standards and do not provide GMP certificates.

30.Is the given "ex-factory basic price" net or gross? What more parts of total amount are gonna be added?

Factory Base Price: The price of a device that can be used, which contains all the components of the most basic supercritical extraction. You may notice that its price is low. This is because our equipment is exported through a third party. The quotes of other companies must include their reasonable profits. Now it is our factory direct export, there is no intermediate link, so the price is It looks low.

31.How much CO2 is recirculated? "CO2 recovery system" - how much does it cost?The CO2 when the system works is recycled. Only at the end of the extraction work, the gas needs to be emptied. Therefore, a part of CO2 can be recovered before the gas is emptied.

The carbon dioxide recovery system can recover about 30% of the carbon dioxide.

Its price is: $10,000.00

32. What about the third separator? Is it usefull to remove water and other pollutants to purify CO2? What does "purification system" mean?In the first separator only waxes can be taken out. What then if we use the other two to separate fractions of extract? Does it make sense according to your experience?

Cannabis does THC suggest using 3 separators. Just extracting the CBD requires only two separators.

The purification system purifies the CO2 of the separated outlet. Some impurities in the carbon dioxide cycle can be cleaned and filtered.

The first separator, which separates the CBD paste. (Please note that the wax is separated at this stage and is included in the paste of the CBD.)

A second separator that separates the mixture of alcohol and THC.

A third separator that separates a small amount of THC, alcohol, and water.

If you need three separate processes, 48L and 72L will increase by $5,700.00 based on our offer.

33.What about the control and recording by a computer unit? "digital control" - how much does it cost?"Automatic control valve" - what's the profit of using it and how does it cost?

What about the control and recording by a computer unit? Basic configuration It includes a pointer meter that works perfectly.

"digital control" - how much does it cost? Digital acquisition and display system cost is $3,000.00. Acquisition control mainly collects pressure temperature and flow in real time, and can control pump start and stop

Automatic control valve:

It sets the pressure and is automatically adjusted by the digital control system.

It costs $8,450.00

If it is 2 separations, two valves are required.

Three valves are required to use three separations.

34. Work cycle of 2 extractors: first vessel is working while the second is maintained.work cycle of 3 extractors: first and second vessel are working in series, the third is maintained.Yes, they work like this.Is above scheme actual with your equipment? If so then I would gladly learn about prices of 3-extractor arrangements.

SCF330-50-*** is 3-extractor

What is the method of controlling a 3-extractor arrangement: manual or automatic by computer?The CO2 flow is automatically cycled, and the pressure can be controlled by hand or automatically by a digital system.

The extraction container is loaded with marijuana or unloaded marijuana for manual work.

Quick opening device on the top of the container

35. What do the flow meters measure: volume or mass?

Knowledge of the flowing mass can give information about the content of extract in the passing liquid.

volume

But it can also be measure mass.

Is it possible to mount a distillation column on the 2x24L or 3x24L unit? Is it profitable for fractionation?

It is completely possible to install a distillation column, and recently we will install a distillation column in one of the equipment exported to the United States.

The distillation column can separates the wax.This way you will reduce the winterization process.

The cost of the distillation column is $8,700.00

How do supercritical fluids work?

When a gas such a carbon dioxide is compressed and heated, its physical properties change and it is referred to as a supercritical fluid. Under these conditions, it has the solvating power of a liquid and the diffusivity of a gas. In short, it has the properties of both a gas and a liquid. This enables supercritical fluids to work extremely well as a processing media for a wide variety of chemical, biological, and polymer extraction.

Near liquid densities increase the probability of interactions between the carbon dioxide and the substrate, similar to a liquid solvent. The gas-like diffusivities of supercritical fluids are typically one to two orders of magnitude greater than liquids, allowing for exceptional mass transfer properties. Moreover, near zero surface tension as well as low viscosities similar to gases, allow supercritical fluids to easily penetrate a microporous matrix material to extract desired compounds. The synergistic combination of density, viscosity, surface tension, diffusivity, and pressure and temperature dependence, allow supercritical fluids to have exceptional extraction capabilities.< p>Another powerful aspect of supercritical fluid extraction (SFE) is the ability to precisely control which component(s) in a complex matrix are extracted and which ones are left behind. This is accomplished through precise control of several key parameters such a temperature, pressure, flow rates and processing time. Yields from SFE are typically much greater than those of extractions performed by traditional techniques. Product purity is high, and decomposition of material almost never occurs due to the relatively mild processing temperatures.

Why is carbon dioxide used most often in SFE?

Supercritical fluid extraction has emerged as an attractive separation technique for the food and pharmaceutical industries due to a growing demand for “natural” processes that do not introduce any residual organic chemicals. Supercritical carbon dioxideis by far the most commonly used supercritical fluid. The unique solvent properties of supercritical carbon dioxide have made it a desirable compound for separating antioxidants, pigments, flavors, fragrances, fatty acids, and essential oils from plant and animal materials. In the supercritical state, carbon dioxidebehaves as a lipophillic solvent and therefore, is able to extract most nonpolar solutes. Separation of the carbon dioxidefrom the extract is simple and nearly instantaneous. No solvent residue is left in the extract as would be typical with organic solvent extraction. Unlike liquid solvents, the solvating power of supercritical carbon dioxidecan be easily adjusted by slight changes in the temperature and pressure, making it possible to extract particular compounds of interest. With the addition of small amounts of polar co-solvents, even polar materials can be extracted. Additional advantages of carbon dioxide are that it is inexpensive, it is available in high purity, it is FDA approved, and it is generally regarded as a safe compound (GRAS). Supercritical carbon dioxideis also desirable for extraction of compounds that are sensitive to extreme conditions because it has a relatively low critical temperature (31°C).

Why is carbon dioxide most often the media of choice for SFR?

The properties which make supercritical carbon dioxide an attractive solvent for extraction also apply to its use as a medium for reaction chemistry. A fluid’s most important physical and transport properties that influence the kinetics of a chemical reaction are intermediate between those of a liquid and a gas in the supercritical carbon dioxide. The reactants and the supercritical carbon dioxide frequently form a single supercritical fluid phase. Supercritical fluids share many of the advantages of gas phase reactions including: miscibility with other gases, low viscosities, and high diffusivities, thereby providing enhanced heat transfers and the potential for fast reactions. Supercritical fluids are especially attractive as a reaction medium for diffusion-controlled reactions involving gaseous reagents such as hydrogen or oxygen.

An example of using supercritical fluids as a reaction medium is the hydrogenation of pharmaceuticals to promote enantio selective hydrogenation to favor a cis or trans version of a molecule during hydrogenation. By performing the reaction in two, instead of three phases, the rate of hydrogenation reactions can be increased over 1,000 times. As a results, the size of the reactor and the associated equipment is less than 1/10th that of conventional autoclave systems. Oils and fatty acid esters, as well as hydrogenare soluble in supercritical carbon dioxide. The reaction rate is increased because excess hydrogenis always available for reaction, and the catalyst pores are not filled with stagnant liquid.

How does SFT’s carbon dioxide pump work?

Various types of pumps can be used for supercritical fluid applications. For medium to large volume processes, a pneumatic booster pump is most often used. A diaphragm pushes against a piston to compress the liquid carbon dioxide to a set pressure point. The air that drives the pump increases the liquid carbon dioxide pressure (boosts) in a ratio of about 100 to 1. So, for every 1 psi of air delivered to the pump, the carbon dioxide pressure is boosted by 100 psi (i.e. air at 50 psi will deliver about 5,000 psi of carbon dioxide). The CO2 pressure is controlled by an air regulator which in turn controls the pump operation. Once the desired pressure is selected, the pump pressurizes the overall system to this set point. When the restrictor valve is opened, the pump will continue to actuate to maintain the desired set point.

Does the liquid carbon dioxide pump shut off during a static extraction?

Yes, the pump will fill/pressurize the extraction vessel up to the set point. If there is no flow of material out of the vessel, the pump will shut off. As soon as the variable restrictor is opened, dissolved materials (analyte) and carbon dioxide begin to flow out of the pressure vessel. The pump will begin to actuate to maintain a pressure set point. Think of the restrictor as a Back Pressure Regulator. As you adjust the restrictor to various flows, the pump will speed up or slow down accordingly to maintain the overall system set point pressure.

Why do require a chiller / recirculator?

The chiller is used to transfer heat away from the pump head. Cooling the pump head ensures that only liquid carbon dioxide reaches the pump. This is important because the unit cannot pump gaseous carbon dioxide. The chiller essentially does two things. It counteracts the heat of compression which occurs inside the pump head, and it removes heat caused by friction of the piston moving back and forth. Both of these heat sources need to be controlled. If the pump head is not cooled, liquid carbon dioxide will enter and immediately flash to gas. The pump will cavitate and will operate inefficiently or not at all.

Why not use a helium head space C02 tank instead of a chiller?

The chiller eliminates the need for helium headspace carbon dioxide tanks. The action of pumping heats up the liquid carbon dioxide causing the liquid carbon dioxide to flash in the pumping head to gas. This results in cavitations and low pump efficiency. Cavitation can be eliminated two ways: first, by use of a chiller assembly to cool the pump head and/or carbon dioxide fluid to about –5 degrees Celsius, eliminating the cavitation problem. Or, second, by use of a higher delivery pressure of carbon dioxide (as delivered in a helium headspace tank at 1,500 psi). Higher delivery pressure keeps the carbon dioxide from flashing to gas, causing the cavitation problem. However, helium headspace tanks cost about $145.00/tank. A standard carbon dioxide is on the order of $30/tank. The chiller assembly pays for itself quickly after about 4-6 months of standard operation. Supercritical Fluid Technologies, Inc. holds a Patent on its “Chill Can” assembly.

Why and how are co-solvents sometimes used in SFE processes?

A small amount of a co-solvent increases the ability of supercritical carbon dioxide to dissolve polar compounds. Neat supercritical CO2 has dissolving properties similar to hexane. This means that, by itself, carbon dioxide is very good for dissolving relatively non-polar materials. The addition of just a small quantity of co-solvent enhances the solubilizing power of the supercritical carbon dioxide, making it possible to extract much more polar molecules. Typical co-solvents include: methanol, ethanol, and water.

< p>Co-solvent addition is typically done using an HPLC type pump. There are two traditional methods a co-solvent pump can be used. Firstly, as a co-solvent doping module where co-solvent is added to the sample to a desired % of the vessel’s overall volume and then the CO2 pump is actuated to bring the vessel up to the desired set pressure for extraction. Secondly, the CO2 and co-solvent pump are both actuated at the same time with the restrictor valve open to maintain a set ratio of co-solvent to CO2 in the sample vessel.< p>Is there a correlation to use with the flow rate of CO2 to maintain a fixed percentage of ethanol in the vessel? Base the amount of co-solvent in the system as a function of the vessel volume. If your vessel is a 100 ml and you want 5% ethanol in your extraction, you would want to add 5 ml of co-solvent to the vessel before you begin the extraction. Once the dynamic flow/extraction has begun, you want to replace the amount of co-solvent that is flushed out of the vessel with the carbon dioxide, maintaining a 5% level throughout the vessel. A Mass Flow Meter (a simple flow meter will suffice) can be used to gauge the amount of carbon dioxide flowing out of the vessel under your dynamic extraction flow step. Take 5% of this volume of carbon dioxide flow adding back that amount of ethanol to the vessel with the co-solvent pump. This is the least complex method of keeping a constant amount of co-solvent in the vessel throughout your extraction.

When and why is a “pre-heater” for the fluid recommended?

A liquid CO2 pre-heater is recommended for all extraction work. Regardless of vessel size and despite the use of band heaters, heating efficiency is limited because of the relatively small vessel surface area relative to the total vessel volume. Especially at high flow rates, SFE’s with larger vessels but no preheater will not hold temperatures with a high degree of accuracy during dynamic flow. To compensate for the physical limitations of the vessel heaters, a fluid pre-heater is used to regulate the temperature of the carbon dioxide and co-solvent before they reach the main sample vessel. For the most efficient and reproducible extraction work, it is highly recommended that a pre-heater always be used.

Which extraction / reaction vessel is right for me?

Supercritical Fluid Technologies, Inc. offers a wide variety of sample vessels and options to meet our clients’ needs. Vessels ranging from 5 ml up to 5000 ml are available for our standard bench scale units. 20 liter and larger vessels may be used in our pilot scale processing systems. Many options are available for these vessels from windows to mixing, as required by the application. One issue to keep in mind as you decide on a vessel for your application is that these are ASME designed vessels and they are heavy! For example, a 4000 ml vessel in our bench scale system weighs in at 280 lbs. You will need an engine hoist to move this vessel around the laboratory! Fortunately, vessels in both the SFT-150 and SFT-250 are mounted on sliding racks. The weight of the vessel becomes an issue only when interchanging vessels. The 5 ml, 25 ml, 50 ml, 100 ml, 300 ml, 500 ml, and 1000 ml vessels, which are ideal for preliminary work, can be handled with little difficulty.

How do I change a hand-tight series vessel seal?

Remove the existing o-ring carefully. Be sure that you do not scratch the vessel’s o-ring groove surface with any tools. We recommend using a plastic or wood stick to remove existing o-ring. Clean all surfaces thoroughly with solvent. Clean the inside of the vessel seal. The inside surface is where the o-ring actually seals. Carefully install the new o-ring in the groove of the cover. New o-rings tend to be stiff and may need to be slowly worked into position. It is sometimes helpful to heat the o-ring in a pot of hot water before installation. This will help relax the o-ring material long enough for installation. Lubricate the o-ring and seal area of the vessel with o-ring grease. A small amount of grease works best. Also lubricate the threads of the nut with process compatible thread lubricant. Thread the cover into the body of the vessel until you feel the resistance of the o-ring being forced into the seal area. Do not try to force the o-ring all at once. Work the threads back and forth gently until the o-ring has worked into the seal area. Continue to tighten until the threads bottom out.

What is a variable restrictor?

A variable restrictor, also known as a Back Pressure Regulator (BPR) is a key component in the successful application of supercritical fluid technology. You will note that all of our products have this key component. The restrictor valve allows for the controlled and metered release of the pressure built up in the sample vessel into the collection assembly. Materials that have been solubilized in the SCF CO2 can now be collected at atmospheric pressure. Beyond the metering out of the flow, the restrictor valve assembly also compensates for the Joule-Thompson cooling that occurs through expansion of pressurized CO2 by adding heat to the assembly. The heating ensures that the valve will not freeze and solubilized analytes precipitate plugging this valve.

Can I process with supercritical water in my SFE unit?

Applications for water as a process media range from subcritical water extraction to supercritical water oxidation to supercritical water reaction processes in this application niche. Supercritical Water Oxidation (SCWO) is among the most challenging applications of supercritical technology. Very high temperatures (over 400oC) and moderately high pressures are required to achieve the critical point of water. An additional difficulty is corrosion, which is a problem for all sub-critical and supercritical water systems. Special materials for vessel linings and tubing are needed to resist the highly reactive chemical species generated during the process.These challenges demand superior engineering and design expertise for all system components. The water and process streams must both be pumped to high initial pressures under exact flow and pressure control. The heat exchangers are subjected to high heat transfer rates at high temperatures, but must maintain precise temperature control. The reaction vessel requires exact temperature, pressure and flow control. The vessel must seal reliably and be leak free each time it is used, regardless of the harsh operating environment. Downstream processing such as cooling heat exchangers, collection vessels, gas/liquid separation and pressure control must be efficient.

It would be much less expensive to purchase a dedicated supercritical water type unit than go through the detailed modifications needed to change the traditional SFE unit to use water as the supercritical fluid.

What is the best solvent to use??

Some herbs are best extracted with a 50-50 mix of ethanol and water or vodka. In some cases, a desired constituent is not soluble in alcohol or water and must be extracted in a more sophisticated solvent like chloroform or ether. If that is the Carbon dioxide is also an ideal solvent because it has different solvent properties at different pressures and temperatures while not leaving trace residuals in the final product.

What will the yield be using Supercritical Fluid Extraction (SFE)??

Generally, the CO2 is used to extract oil, so the more resinous your material is, the better your yields will be. We have experience with a wide variety of botanicals and the parameters needed To get the best results.

What are the different pumps used in SFE and how do they work?

What kind of routine maintenance do supercritical co2 extraction systems require?

The systems which run through the vessel are soluble, so almost no cleaning is required. For example, when using the system to extract new materials, the only maintenance required is to run the system while it is Empty in order to clean it out. If you need to be certain there are no residuals, you flush the system with ethanol. Minimal maintenance required consists of cleaning the filter behind the pump, testing the relief valves, monitoring compressor oil levels, and occasionally Having gaskets and O-rings. To keep you and your business consistently running, routine maintenance will be taught during your training.

What’s the ideal environment to operate the supercritical CO2 extraction system?

Maximum environmental temperature should be about 22°C / 72°F. Humidity should be in the range of 30%-60%. You will want 10 - 15 air exchanges per hour or as required by regulation. For ventilation, you will most enough To apply remove gases released from vent points on the Hi-Flo system.

How should I prep the plant material?

As dry as possible, a fine grind, with a light pack is best used in the extraction vessel. View some grind recommendations on the Eden Labs Extraction Forum here.

Will heat damage my herbal extract?

Different herbs have varying sensitivities to heat. It is usually good to have some heat when processing herbs. Moderation is the key. Temperature ranges from 100-150 degrees Fahrenheit are usually ideal. All of our CO2 extraction system will operate in this temperature range and more If you want to follow this rule, a cold percolation unit, the Professional Round Bottom unit, or a mixing tank is the way to go.

How are solvents removed from the extract when using the supercritical CO2 extraction system?

Solvents are distilled (removed) generally by one of the following manners: under gentle heat; gent

What are the different pumps used in SFE and how do they work?

supercritical co2 extraction equipment