CN100410258C - New super critical CO2 extraction process - Google Patents

New super critical CO2 extraction process Download PDF

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Publication number
CN100410258C
CN100410258C CNB2006101273745A CN200610127374A CN100410258C CN 100410258 C CN100410258 C CN 100410258C CN B2006101273745 A CNB2006101273745 A CN B2006101273745A CN 200610127374 A CN200610127374 A CN 200610127374A CN 100410258 C CN100410258 C CN 100410258C
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extraction
supercritical
fluid
tower
temperature
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CN1944436A (en
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叶明汤
叶姝
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids

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Abstract

The new supercritical CO2 extraction process includes the steps of CO2 extraction and CO2 circulation, separation, system cool energy utilization, and two tower operation and CO2 recovery. The technological process is practical in industrial production and has the features one low power consumption, high efficiency, high arteannuim yield and system CO2 recovering rate up to 98 %.

Description

Supercritical CO 2Extracting process
Technical field
The invention belongs to tcm field, relate to supercritical CO 2Extraction and separation technology.
Background technology
Supercritical CO 2Extraction process be last century the eighties develop novel process.Many in the world countries have been widely used in food and have extracted from plant in the field such as organism.Supercritical CO 2Extraction process research, device structure etc. have the patent report more.Patent CN1095381A proposes Artemisinin extraction process condition by laboratory test; CN1297782A has reported with this technology and has extracted Hops Extract, and CO when reclaiming by increase equipment that extraction kettle once stops discharging in the supercritical extraction process 2Recovery method.
Artemisinin proves through the pharmacology clinical application, and for treatment Asia property malaria, encephalic malaria and chloroquine resistant disease etc. has the characteristics of quick-acting low toxicities, is medical market medicine very in short supply both at home and abroad.Extract sweet wormwood and have several different methods from dried artemisia leaf, being used for industrial at present is traditional solvent leaching method.Patent CN87101346A, CN1092073A, CN1281859A all report for work.Solvent leaching method mainly is to be solvent with alcohols, ethers, hydro carbons.With ebullient solvent leaching, evaporation (or reduction vaporization) obtains the syrup paste crystallization treatment of decolouring and obtains product then.Solvent leaching method generally will be given processing through long-time dipping, and then through secondary sometimes in addition three heating extract and most Artemisinin could be leached out, product yield is low, production cost is also high relatively.It is also long that solvent leaching method consumes solvent, contaminate environment, recovery solvent energy consumption height, production cycle.
Supercritical CO by contrast 2Extracting artemisine technology is more advanced, and the high production cost of product yield is low, and the product Artemisinin does not contain any impurity, belongs to pure natural substance.Production environment does not have any pollution, factory belongs to clean and environment-friendly factory.But this technical process wants the industrialization difficulty big, invests also big.This almost is experts' view out of question in this field.
Summary of the invention
The present invention is from realizing the suitability for industrialized production target design.The present invention relates to a kind of supercritical CO 2Extracting process, described technology comprises supercritical CO 2Extraction and CO 2Working cycle, sepn process and recovery CO 2Process is characterized in that the operation of (1) two tower, i.e. supercritical CO 2Two extraction towers are set during extraction, and two extraction towers use by turns, (2) CO 2Comprise in the working cycle that system's cold energy utilizes process, it is the temperature that reduces the hot-fluid that returns extraction tower by the cold fluid that the heat exchanging apparatus that is arranged between extraction tower and the separating device forms because of decompression with the extraction tower effluent.
Above-mentioned supercritical CO 2 extracting process, its feature also is, cooling fluid temperature Da Yue-5 ℃ of utilizing the extraction tower effluent in the process to form because of decompression of described system cold energy, return matter such as the hot-fluid of extraction tower and above-mentioned cold fluid and temperature and be not more than about 40 ℃, reduce to 5～10 ℃ by the temperature of described hot-fluid after the heat exchange, pressure is about 4Mpa.
Above-mentioned supercritical CO 2Extracting process, its feature also be, the shared cover of described two extraction towers is reinforced, separation, after-treatment system.
Above-mentioned supercritical CO 2Extracting process, its feature also are, use two separators in the sepn process.
Above-mentioned supercritical CO 2Extracting process, its feature are that also it reclaims CO 2Reach 98%, described CO 2Total amount comprises and adds CO in extraction tower in the extraction process, heat exchanging apparatus, the separating device 2Total amount and.
Above-mentioned supercritical CO 2Extracting process can be used for Artemisinin; Various lipotropy products such as lecithin, caffeine; Flavour ingredient in the fruit such as citrus, lemon; And the extraction of multiple herbal medicine effective ingredient.Preferably, the present invention's supercritical CO 2Extract from the dried artemisia leaf of artificial growth as solvent and to obtain the product Artemisinin.
Supercritical CO of the present invention 2Extracting process has following beneficial effect:
1, practical: this invention is conceived to the energy industrialization design, can specifically be implemented on the industrialization running fully.
2, energy consumption is low: make full use of the effusive CO of extraction tower by heat exchanging apparatus 2The cold fluid that forms because of step-down reduces the CO that returns extraction tower 2The temperature of hot-fluid; Energy is saved more than 50%.
3, efficient height: design two tower flow processs, the Artemisinin production throughput is doubled, full extracting system CO 2The rate of recovery reaches 98%.
4, suitability is wide: supercritical CO of the present invention 2The extracting artemisine novel process is suitable for various lipophilics and produces thing such as lecithin, caffeine; Fragrance ingredient in the fruit such as citrus, lemon; And the extraction of various herbal medicine effective ingredients.
Description of drawings
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is a kind of concrete supercritical CO of the present invention 2The schema of extraction process.
Wherein, 1-CO 2Basin 2-strainer 3-supercooler 4-ram pump 5,6-extraction tower 7-heat exchanger 8-separator A 9-separator B
Embodiment
Be that the present invention describes in detail below.
CO 2Extraction and working cycle:
Be in supercritical CO 2Enter temperature and closely contact greater than solid matter (as artemisia leaf, citrus, fruit, various herbal medicine etc.) in about 45 ℃ extraction tower and the tower, effective constituent wherein (as Artemisinin etc.) is dissolved in CO 2In, contain the CO of effective constituent (as Artemisinin etc.) 2Fluid flows out from extraction tower top, by parsing the thick product of extraction (as the Artemisinin crude product etc.) through the step-down of two separator secondaries again in the Tube Sheet of Heat Exchanger.From the effusive CO of last separator 2About 40 ℃ of temperature, pressure is greater than about 4Mpa.Through the interchanger skin flow through with the extraction cat head flow out the CO that its quality equates 2Fluid carries out heat exchange temperature and reduces to 5-10 ℃, sends into extraction tower through the recycle pump pressurization again, realizes CO 2Extract the whole process of described product (as Artemisinin etc.) and circular flow.
Sepn process:
The CO that contains extracted products (as Artemisinin etc.) 2Fluid enters separator from first separator middle part, and pressure drops to about 7.5Mpa, about 50 ℃ of separator temperature, described extracted products under this state (as Artemisinin etc.) at CO 2In solubleness reduce, and from CO 2In separate out; Fully preferably carry out secondary separation, CO in order to separate 2Fluid flows out from second separator middle part from above-mentioned first separator top and enters second separator, CO 2Hydrodynamicpressure is reduced to about 4Mpa, and separator temperature is greater than about 40 ℃, and described extracted products under this state (as Artemisinin etc.) is almost all from CO 2In parse.Emit extraction crude product (is that example is a black paste Artemisinin crude product with the Artemisinin) from two separator bottoms and collect together, handle by subsequent handling.
System's cold energy is utilized process:
CO 2Fluid mass is identical only to be the temperature difference, and the present invention is provided with a heat exchanging apparatus (as an interchanger) between extraction tower and first separator, realize from the effusive cold fluid of cat head with return the extraction tower hot-fluid from second separator and carry out heat exchange.
CO 2Fluid flows out from extraction tower top and enters first separator, and pressure is reduced to about 7.5Mpa from＞about 15Mpa, and the pressure reduction makes a little CO 2Vaporization becomes or gas phase from liquid phase, makes CO 2Fluid produces dry ice or cloud point becomes cold fluid, and system temperature reaches sub-zero zero.In order to eliminate this phenomenon, available technology adopting is used the method for chuck hot water heat temperature raising before entering first separator.Then realize the intensification of described cold fluid among the present invention, i.e. the about 4Mpa of pressure, the about 40 ℃ CO of temperature that discharges from second separator top by above-mentioned heat exchanging apparatus 2Hot-fluid flows through through the interchanger outer tube, and the above-mentioned cold fluid in the pipe is heated up, and makes the temperature of above-mentioned hot-fluid grand to 5～10 ℃ first; Hot-fluid after the described cooling returns extraction tower through ram pump pressurization again and recycles.Separator hot water consumption can reduce in the production process like this, and no longer uses the CO of cryogen refrigeration cycle 2Fluid, it is very tangible cutting down the consumption of energy.
Operation of two towers and recovery CO 2Process:
Two extraction towers are set, and two cone pulleys change use in the production, and extracting system equipment is fully used, and the production product is doubled.Utilize two Tower Systems to reclaim CO 2When extraction tower is finished a collection of production, CO in the tower 2The about 4Mpa of pressure, every cubic metre CO 2About 80 kilograms, very big as not reclaiming waste.With double-column process recyclable half.When tower stops, open between two towers connecting pipe at short notice the pressure of two towers reach balance, at this moment cut off two tower connecting pipelines, tower to be opened enters the driving program for the treatment of.Parking tower pressure is reduced to 2Mpa, every cubic metre of CO 2Weight only is the CO of system for about 40 kilograms 22% of total amount, it is little to reclaim economic worth again.
Again the present invention is done further specific description by the following examples, but the present invention is not limited by these fully.
Adopt supercritical CO of the present invention 2The technical process of extracting process extracting artemisine from dried artemisia leaf as shown in Figure 1.Operating process divided for four steps implemented:
The first step: add the artemisia leaf that is extracted in the extraction tower, open or close that related valve is in the state of can driving by system in the extracting system.Open CO 2The bleeder valve of basin 1 slowly injects COs by the charge pump bypass pipe to extraction tower 5, heat exchanger 7, separator 8,9 by self pressure 2, when the system pressure balance reaches 4Mpa, close the discharging valve of extraction tower 5 and separator 8.
Second step: with supercooler 3 precoolings, through each chuck of equipment extraction tower 5 is heated to 40 ℃ with hot water with cryogen, separator 8 is heated to 50 ℃, and separator 9 is heated to 40 ℃.
The 3rd step: starting ram pump 4 adds CO through extraction tower 5 bottoms in tower when each device temperature reaches requirement 2, when extraction tower 5 pressure reach 15Mpa, slowly open the discharging valve and send into CO to separator 8 through heat exchanger 7 2When separator 8 pressure reach 7.5Mpa, slowly open top discharging valve and send into CO to separator 9 2, separator 9 pressure maintain 4～4.5Mpa fluctuation, discharge CO from separator 9 tops 2Flow through after heat exchanger outer tube cooling strainer 2, supercooler 3 return extraction tower by ram pump 4 again.After each equipment pressure of total system, temperature reach operation index, close CO 2The outlet valve of basin 1.Realize the running of whole process closed circulation.CO through heat exchanger 7 coolings 2When fluid can satisfy the normal reinforced work of ram pump 4, turn down or close the refrigerant of supercooler 3.Whole process extraction time need were finished in about 3 hours.Whether the extraction time is enough, can determine from the black Artemisinin crude product amount that two separators are emitted.
The 4th step: parking discharging.Extraction stops ram pump 4 earlier when finishing, and closes the bleeder valve of separator 8, through the CO of bypass tube with extraction tower 2Put into separator 9, be higher than the CO of 4Mpa pressure through separator 9 2Enter CO 2Basin 1 when separator 9 pressure reach 4Mpa, is closed the discharging valve, closes CO 2Basin 1 charging valve is closed extraction tower top discharge valve.Two separators are in the state of can driving.Open two extraction tower bottoms and be communicated with valve, with CO in the extraction tower 5 2After entering extraction tower 6, two pressure tower balances, cut off two towers and be communicated with valve.Extraction tower 6 communicates with extracting system, repeats the driving state of front.
Open extraction tower 5 upper and lower covers and put artemisia leaf in the clean tower, after artemisia leaf had been put, the lower cover that resets earlier refilled artemisia leaf, installed the loam cake that resets behind the artemisia leaf, extraction tower 5 is in is equipped with the driving state.

Claims (6)

1. supercritical CO 2Extracting process comprises supercritical CO 2Extraction and CO 2Working cycle; Sepn process and recovery CO 2Process is characterized in that, the operation of (1) two tower, i.e. supercritical CO 2Two extraction towers are set during extraction, and two extraction towers use by turns, (2) CO 2Comprise in the working cycle that system's cold energy utilizes process, it is the temperature that reduces the hot-fluid that returns extraction tower by the cold fluid that the heat exchanging apparatus that is arranged between extraction tower and the separating device forms because of decompression with the extraction tower effluent.
2. supercritical CO as claimed in claim 1 2Extracting process, its feature also is, described system cold energy utilizes the extraction tower effluent in the process to reach-5 ℃ because of the cooling fluid temperature that decompression forms, return matter such as the hot-fluid of extraction tower and above-mentioned cold fluid and temperature and be not more than 40 ℃, reduce to 5～10 ℃ by the temperature of described hot-fluid after the heat exchange, pressure is 4Mpa.
3. supercritical CO as claimed in claim 1 2Extracting process, its feature also be, the shared cover of described two extraction towers is reinforced, separation, after-treatment system.
4. supercritical CO as claimed in claim 1 2Extracting process, its feature also are, use two separators in the sepn process.
5. as each described supercritical CO in the claim 1 to 4 2Extracting process, its feature also be, the product of its extraction is Artemisinin, be selected from flavour ingredient in lipotropy product, citrus or the lemon of lecithin and caffeine and the effective ingredient in the multiple herbal medicine.
6. supercritical CO as claimed in claim 5 2Extracting process, its feature are that also the product of its extraction is an Artemisinin.
CNB2006101273745A 2005-09-22 2006-09-18 New super critical CO2 extraction process Expired - Fee Related CN100410258C (en)

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CN200510104908 2005-09-22
CN200510104908.8 2005-09-22
CNB2006101273745A CN100410258C (en) 2005-09-22 2006-09-18 New super critical CO2 extraction process

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101781475A (en) * 2010-03-15 2010-07-21 叶明汤 Industrial production method for extracting capsicum oleoresin and capsanthin by using supercritical CO2
CN102477035B (en) * 2010-11-23 2014-12-10 成都合盛生物技术有限公司 Cleaning process for extracting and purifying tabersonine from voacango Africana stapf seeds
CN104140433A (en) * 2013-05-10 2014-11-12 天津瑞信医药科技有限公司 Artemisinin preparation method
CN104073362B (en) * 2014-07-02 2016-05-11 沈阳化工研究院有限公司 Extracting method, its product and the application of sweet wormwood volatile oil
CN105268209A (en) * 2014-07-21 2016-01-27 陈双亭 Supercutical fluid extraction energy-saving process method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1101236C (en) * 1999-11-26 2003-02-12 中国寰球工程公司 New supercritical CO2 extraction technology

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1101236C (en) * 1999-11-26 2003-02-12 中国寰球工程公司 New supercritical CO2 extraction technology

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