# Supercritical CO2 extraction of chili oleoresin

#### Optimum experimental process parameters for supercritical extraction of chilli oleoresin

** Laboratory equipment:** HA120-50-01 Supercritical co2 extraction equipment

** Pulverization degree:** 50 mesh

** Extraction pressure: **30 MPa

** Extraction temperature: **315k

** Extraction time: **36 min

#### Summary

In summary, the experimental extraction pressure is 30 MPa, temperature is 315 K, time is 3.0 h, and CO2 flow is 0.40 m3 / h.

#### Foreword:

Capsicum belongs to the Solanaceae family. Currently, there are dozens of varieties of it. It is widely planted in North and South China, and its output ranks first in the world. Pepper contains a variety of effective ingredients, and its fruits contain capsaicin, pigments, vitamins, organic acids, proteins, sugars and minerals.

As a green and environmentally friendly food, capsicum red pigment has been widely used in cosmetics, beverages, candy, medicine, feed and other industries.

#### Experimental method:

*Process flow*

In the experiment, supercritical extraction with chili powder was used to obtain chili oleoresin.

Before starting the experiment, check the pressure of the CO2 gas in the cylinder. The experimental conditions require that the pressure in the cylinder must be above 4 MPa. After the raw materials are added and started, the CO2 gas in the cylinder passes through the filter and enters the cooling system. Then the pump is pressurized to the required pressure to become Supercritical CO2 enters the purifier and the preheater in turn, and then enters from the bottom of the extraction kettle and passes through the material layer in the extraction kettle.

The CO2 fluid with part of the solute dissolved flows out from the top of the extraction kettle, enters the top of the separation kettle through the regulating valve and goes deep into the separation kettle for gas-liquid phase separation. The extracted products are collected through the bottom sampling valve of the separation kettle Ⅰ and the separation kettle Ⅱ. The gas phase passes through the separation kettle The top comes out, passes the regulating valve, and then enters the secondary separation kettle, and then the CO2 gas is re-entered into the system after flow measurement, and recycled.

Shut down and close all valves after extraction. After depressurizing, remove the product in the extraction kettle through the barrel.

The fineness range of paprika is selected. When the particle size is 20, 30, 50, 50 ～ 60 mesh, the extraction rate is 2.73%, 3.22%, 3.75%, 3.83%. Therefore, it is recommended to use 30 ～ 50 mesh size Range. The crushed particle size of this experiment is 50 mesh, and the water content is less than 5%.

The selection of the optimal extraction conditions, the extraction pressure has a significant effect on the extraction rate. At 28 MPa extraction pressure, the extraction rate is quite fast. In a short time (4 h), a higher extraction rate can be obtained, which are 3.96 %, 4.50%, 4.16%.

The extraction temperature curve is relatively gentle. Only when the extraction pressure is 16 MPa, the effect of extraction temperature is slightly enhanced. The relative deviation between the maximum extraction rate and the minimum extraction rate is 51.90%, and the maximum extraction is at an extraction pressure of 22, 28 MPa. The relative deviations between the extraction rate and the minimum extraction rate were 22.10% and 16.20%. And when the extraction pressure is lower than 22 MPa, the extraction temperature has a greater effect on the extraction effect. With the increase of the extraction pressure, the effect of the extraction temperature has a downward trend. .

In the range of 1 to 3 h, the extraction rate is large. With the extension of time, the extraction rate decreases. After 6 hours of extraction at 22 MPa, the extraction rate reaches 4.30%. An extraction with an extraction pressure of 28 MPa was obtained. The same extraction rate at 4 h.

When the CO2 flow rate is 0.10 to 0.40 m3 / h, the change of the extraction curve is basically a straight line; when the CO2 flow rate is 0.40 to 0.45 m3 / h, the change of the extraction curve is relatively gentle, and the extraction rate changes from 3.86% to 4.10%; During the change of CO2 flow rate from 0.10 to 0.45 m3 / h, the relative deviations of the extraction rate changes were 50.90%, 27.80%, 19.90%, and 6.20%, respectively; continuing to increase the CO2 flow rate, the effect on the extraction rate is no longer significant. It shows that under certain extraction conditions, considering the comprehensive use of CO2 utilization efficiency and extraction effect, there is an optimal flow rate.

In summary, the experimental extraction pressure is 30 MPa, temperature is 315 K, time is 3.0 h, and CO2 flow is 0.40 m3 / h.