Supercritical fluid extraction technology: a new favorite of traditional Chinese medicine extraction
Supercritical fluid extraction technology
Supercritical fluid extraction (SFE) is a process of extracting and separating specific components from liquids or solids by utilizing the high solubility of supercritical fluids to solutes under supercritical conditions. There are many substances that can be used as supercritical fluids, but considering the low cost, low critical temperature and pressure, low latent heat of evaporation, safety and environmental protection, supercritical fluids widely used for extraction are carbon dioxide.
The supercritical carbon dioxide extraction (SFE-CO2) process is different according to different extraction objects and tasks. The simplest process can be divided into extraction section and separation section, in which the extraction section refers to the transfer of solutes from raw materials to carbon dioxide fluid, and the separation section refers to the separation of solutes and carbon dioxide and the separation of different solutes. In the actual operation of SFE-CO2, there are many factors, such as extraction pressure, extraction temperature, particle size of raw materials, CO2 flow rate and CO2 entrainer, etc. So the extraction process is different.
Super Critical CO2 Extraction Device:
1L, 2L, 5L/50Mpa, 10L, 24L/40Mpa, 50-200L/32Mpa,
Fine Distillation Column
inner diameter 25X2-3m/30Mpa,35X2-3m/30Mpa, 48X4-6m/30Mpa, 78X4-6m/30Mpa
High Pressure Pump
20L/40Mpa.h double-plunger, 50L/50Mpa.h double-plunger frequency-modulating, 400L/40Mpa.h three-plunger frequency-modulating, 800l/40Mpa.h three-plunger frequency-modulating, the pump head application.
in the course of extraction, the entraner is used to change polarities of CO2 so as to extend range of application.
equipped with semi-sealed or full-sealed compressor to meet technological requirement.
Heat Exchange and Temperature Control System
according to technological requirement, the heat exchange and temperature control system are equipped for extraction kettle, separtion kettle and fine distillation column respectively to control the temperature of water circulation at -85℃ and the temperature pf oil circulation at -150℃; the digital display double-screen is used to control the temperature of water bath and to measure the temperature of CO2 fluid with accuracy of temperatire control at ±1℃.
Pressure Control (Protection)
equipped with the electro connecting pressure gauge at the outlet of the high pressure pump and set the working prssure to release pressure and make automatic protection in case overpressure occurs; equipped with safety valves for high pressure pump, extraction kettle, separtio kettle, fine distillation column according to their maximum working pressure to release pressure and make automatic protection in case overpressure occurs; equipped with back-pressure valve system at the outlet of the extraction kettle which has stable pressure and is easy to make adjustment. The control accuracy of pressure (dynamic) is ± 0.1MPa.
Display of Flow
the metal rotor flow meter with remote transferable digital display for instant flow and accumulated flow respectively.
all containers, valves, pipe fittings and pipelines contacting with fluid are all made of stainless steel.
three-phase-four-wire power supply with 380V/50Hz and CO2 with foodstuff grade ≥99.5% are prepared by customer itself.