supercritical co2 extraction machine
Home >> Supercritical Fluid System >> Supercritical CO2 Fluid Extraction Information >> Preparation of biodiesel by supercritical reaction

Preparation of biodiesel by supercritical reaction


In recent years, biodiesel has become a research hotspot as a green and renewable energy source.The supercritical method is favored because of its fast reaction speed, high conversion rate, no need for catalyst, and simple separation. The continuous supercritical methanol method can greatly improve production efficiency and biodiesel quality. Based on the two processes of continuous supercritical extraction and transesterification, this paper proposes a supercritical extraction-transesterification reaction coupling process, which realizes the direct production of biodiesel from oily raw materials with local materials, which is of great significance to the industrialization of biodiesel .

The extraction temperature is 40C, the CO2 flow rate is 2 L/min, the n-hexane flow rate is 0.4 ml/min, the reaction pressure is 20 MPa, and the transesterification reaction temperature is 250-350C. The supercritical coupling reaction and the supercritical extraction reaction are compared. The results are shown in Figure 1. It is shown that as the reaction temperature increases, the coupling reaction yield also increases. This is because increasing the temperature aggravates molecular motion, promotes molecular diffusion, and facilitates the reaction, which is consistent with the law of simple esterification. It can be found that in the coupling of supercritical CO2 extraction with or without co-solvent and supercritical transesterification, adding n-hexane can not only increase the rate of the extraction stage, but also facilitate the transesterification reaction and increase the yield of methyl esters. This may be Because the n-hexane in the extraction stage enters the transesterification stage together with the oil, it can be miscible with alcohol and oil, and acts as a co-solvent under high temperature and high pressure, making the reactants contact more fully, thereby increasing the yield.

Related Posts

Supercritical CO2 fluid extraction to remove coffee oil

Crush to coffee bean, about 500 grams Supercritical CO2 fluid extraction to remove coffee oil Pressure (20MPa) extraction for 25 minutes Pressure (30MPa) extraction for 40 minutes Extract obtained total of 5.3g Coffee powder after extraction

Supercritical reaction and vitamin industry

Supercritical reaction and vitamin industry

Supercritical CO2 extraction of peony seed oil

Comprehensive investigation of various factors to obtain the best extraction process parameters: crush peony seed cuttings to 30 meshes, extraction temperature is 45℃, extraction pressure is 30MPa, separation temperature is 40℃, separation pressure..

Supercritical CO2 extraction of linseed oil from linseed meal

The effect of pressure on extraction rateEffect of temperature on extraction rate Effect of extraction time on extraction rate

Supercritical CO2 fluid cleaning system feature

The supercritical cleaning device mainly uses the principle of supercritical CO2 extraction to realize the cleaning of semiconductor silicon wafers: all in the CO2 supercritical state: the semiconductor silicon wafers are placed in a supercritical CO..

Comparison of Different Process Extraction of Propolis

For comparison of total flavonoid content, the quality of propolis obtained by supercritical CO2 + alcohol extraction process is the best.