1. Main structure composition:
● Refrigeration system
● CO2 storage tank
● Extraction kettle
● Separation kettle
● Distillation column
● Carbon dioxide injection pump
● Carrier pump
● Pressure control system
● Cold and hot water circulation system,
● Lifting device
● Joint operation platform,
● Pipeline components
● Safety protection device
● Data acquisition
● Electric control cabinet rack panel etc.
The whole set of equipment is made of stainless steel containers and pipes commonly used in medicine and food industry, and the bracket is made of stainless steel. The auxiliary equipment and system can meet the requirements of supercritical extraction and process. The extraction kettle has high safety and reliability. The extraction medium is CO2, which can be recycled. All equipments are arranged in a centralized way, neat, compact and reasonable. The operation is convenient, intuitive, safe and reliable.
Working description of CO2 system:
CO2 enters the condenser from the steel cylinder and is filled into the CO2 storage tank. The liquid CO2 in the CO2 storage tank is pumped into the heat exchanger by the CO2 main pump and heated by the heat exchanger, so that the CO2 phase changes into supercritical state and meets the requirements of the process flow. The supercritical CO2 enters the extraction kettle from the bottom of the extraction furnace and fully contacts with the material, and the material is extracted in the extraction kettle.
The extracted mixture and CO2 from the top outlet of the extraction kettle, through the high-pressure control valve at the outlet of the extraction kettle, enters the primary separation kettle for analysis. The process conditions of the first stage separation kettle were controlled to separate the extraction mixture. The analyte was removed from the bottom of the separation vessel.
The extraction mixture that does not meet the analytical conditions is regulated by the high-pressure control valve at the outlet of the primary separation kettle to enter the secondary separation kettle. The process conditions of the secondary separation kettle are controlled, and the extraction mixture is analyzed and separated again. The analyte was removed from the bottom of the separation vessel. Finally, the gaseous CO2 is filtered into the condenser through the filter. After condensation, the gaseous CO2 becomes liquid and enters into the CO2 storage tank for repeated circulation extraction.