CO2 extraction pressure
The extraction pressure has the greatest impact on the experiment. When the temperature is constant, the pressure increases, and the density of supercritical CO2 also increases, thereby increasing the solubility of CO2. When the pressure increases to a certain level, the solubility of CO2 increases very slowly. We set the extraction experiment conditions as raw material particle size 20-40 mesh, extraction temperature 40°C, extraction time 2h, CO2 flow rate: 20~30L/h, separator I pressure 14MPa, separator I temperature 45°C, separator II pressure 6MPa, The temperature of separator II is 40°C, and the experimental results show that the optimal extraction pressure is 70MPa.
co2 extraction temperature
The extraction temperature is restricted by the stability of astaxanthin. The storage of astaxanthin requires low temperature, protection from light, and oxygen isolation. According to the characteristics of astaxanthin, we set the extraction experiment conditions as follows: raw material particle size 20-40 mesh, extraction pressure 70MPa, Extraction time 2h, CO2 flow rate: 20~30L/h, Separator I pressure 14MPa, Separator I temperature 45°C, Separator II pressure 6MPa, Separator II temperature 40°C, and the experimental results are shown in the table below.
The experimental results show that the optimal extraction temperature is 40°C.
When the extraction pressure, temperature, flow rate, and other conditions are constant, the longer the extraction time, the higher the extraction yield. The CO2 extraction experiment conditions are set as follows: raw material particle size 20-40 mesh, extraction pressure 70MPa, extraction temperature 40°C, CO2flow rate: 20 ~30L/h, Separator I pressure is 14MPa, Separator I temperature is 45°C, Separator II pressure is 6MPa, Separator II temperature is 40°C.
The broken wall Haematococcus Pluvialis powder is made into three different particle sizes for the CO2 extraction machine;
The particle size was 10-20 mesh; 20-40 mesh*40-60 mesh 丨 Compare the effect of the particle size of Haematococcus Pluvialis on the extraction yield. The supercritical CO2 extraction process conditions are extraction pressure 70MPa, extraction temperature 40C, extraction time 7 hours, and CO2 flow rate: 2O~3OL/h.
The experimental results show that the particle size of 20-40 mesh is the best particle size.
CO2 flow rate
If the flow rate of CO2 is too low, the extraction time will be prolonged; if the flow rate is too high, the CO2 will leave without reaching saturation with the raw materials in the circulation, resulting in waste of CO? and other resources. Therefore, the flow rate generally adopts empirical values, according to our Experience, the flow rate of CO2 is 20~30L/h.