CN1147428C - Process for preparing food-class high-purity liquid CO2 - Google Patents
Process for preparing food-class high-purity liquid CO2 Download PDFInfo
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- CN1147428C CN1147428C CNB001161873A CN00116187A CN1147428C CN 1147428 C CN1147428 C CN 1147428C CN B001161873 A CNB001161873 A CN B001161873A CN 00116187 A CN00116187 A CN 00116187A CN 1147428 C CN1147428 C CN 1147428C
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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
Abstract
The present invention relates to a production method of high-purity food-class liquid CO2. CO2 from a battery limit is treated through the processes in sequence: saturation elimination of a water separator, medium pressure rise of a compressor, conversion of an organic sulfur converter, desulfurization of a desulfuring tank, and impurity removal of an activated carbon adsorber; the discharged gas is cooled by a cooler and enters the water separator, and then the gas enters a molecular sieve purifier and a fine filter in sequence; the filtrated CO2 gas enters a precooler and a liquefier, and finally enters a product storage tank of liquid CO2. The recovery rate of the product of the present invention is high, the product quality reaches the quality requirement for international food-class CO2 at a time, and the production method can be applied to special fields of welding, supercritical extraction, medicine, optics, etc. The scale of the production method of the present invention can be enlarged, the scale benefit can be gained, and the production cost can be reduced. The product produced by the method is convenient for transportation.
Description
The present invention relates to the production method of a kind of production method of Liquid carbon dioxide, particularly a kind of food-class high-purity liquid CO 2.
The production method of Liquid carbon dioxide adopts three kinds of methods at home and abroad substantially: low-pressure process, middle-pressure process and high-pressure process.The main at present high-pressure process that adopts of China is 22～30 ℃ of normal temperature, liquefy under pressure 6.0MPa～9.0MPa condition, this method pressure height, the shipment of product needed high-pressure cylinder, labour intensity is big, liquefied fraction and production efficiency are low, and industrial scale can not maximize, and produce Liquid carbon dioxide per year and only are 2000～3000 tons; The middle-pressure process that adopts is that carbonic acid gas separates through washing, enter charcoal trap, enter the gas mixer again, compressed machine compression is boosted, and enters filtered through silica gel adsorber, molecular sieve adsorber and gas heater, enters liquefier and liquefied ammonia heat exchange at last, be cooled to-20～-25 ℃, enter the product storage tank, the quality product that this method is produced does not reach the requirement of using in welding, food and supercritical extraction field, mainly be impurity, water, sulphur deviate from not reach requirement.
The object of the present invention is to provide the production method of a kind of quality product height, food-class high-purity liquid CO 2 that efficient is high.
The present invention is achieved in that the production method of a kind of high purity food and Liquid carbon dioxide, it is characterized in that: it will separate through water separator successively from the carbonic acid gas of battery limit (BL), compressor rises to middle pressure, and the organosulfur convertor transforms, and desulfurizer desulfurization and active carbon adsorber take off impurity; The gas that comes out cools off through water cooler, enters water separator, enters molecular sieve purification device and fine filter then successively; Carbon dioxide after the filtration enters pre-cooler, liquefier, enters the Liquid carbon dioxide storage tank at last.
Aforementioned production method specifically is meant: from the carbonic acid gas of battery limit (BL), enter the carbonic acid gas water separator and separate saturation water, enter carbon dioxide compressor, gauge pressure adds to 2～2.5MPa, be warming up to 80～130 ℃, enter the organosulfur convertor then organosulfur is converted into inorganic sulfur, enter desulfurizer and active carbon adsorber again, organosulfur, inorganic sulfur and part moisture are fallen in absorption, make the sulfur-bearing total amount less than 0.1 milligram/cubic metre; The gas that comes out through water cooler be water-cooled to≤40 ℃, enter the carbonic acid gas water separator and separate saturation water, enter carbon dioxide molecule sieve cleaner and carbonic acid gas fine filter then, thoroughly unwatering, bacterium and peculiar smell make water＜10PPm; Carbon dioxide after the filtration enters the carbon dioxide precooling device and is chilled to-5～0 ℃ in advance, enters the co 2 liquefaction device, makes carbonic acid gas become liquid by gas, and its temperature is-19～-15 ℃, enters the Liquid carbon dioxide storage tank at last.
The rate of recovery height of product of the present invention; The disposable international food grade carbon-dioxide specification of quality that reaches of quality product, and can use in the special dimensions such as medicine, optics at welding, supercritical extraction; The scale of production method of the present invention can maximize, can reach the scale benefit, can reduce production costs; The product that this law is produced is convenient to transportation.
The invention will be further described below in conjunction with embodiment:
Embodiment: from the unstripped gas carbonic acid gas outside the battery limit (BL), its purity is 99.5%, and gauge pressure is 0.02MPa, temperature≤40 ℃, and flow is 1100Nm
3/ h enters the carbonic acid gas water separator and separates saturation water, and compressed again machine rises gauge pressure to 2.5MPa, temperature rises to 100 ℃, pass through organosulfur convertor, desulfurizer, charcoal absorption groove successively, remove organosulfur and inorganic sulfur and other impurity, make the sulfur-bearing total amount less than 0.1 milligram/cubic metre; The gas that comes out is removed saturation water through watercooler and water separator, and temperature≤40 ℃ are passed through molecular sieve purification device, carbonic acid gas fine filter more successively, thoroughly unwatering (water＜10PPm), bacterium and peculiar smell; Carbon dioxide after the filtration is cooled to-5 ℃ through pre-cooler, is cooled to Liquid carbon dioxide through the co 2 liquefaction device again, and input Liquid carbon dioxide storage tank is stored, and the pressure of product liquid carbonic acid gas is 2.0MPa, and temperature is-16 ℃.
Products obtained therefrom detects through Sichuan Province Bureau of Technical Supervision gas products quality monitoring testing station, and product quality indicator is as follows:
Purity＞99.8% moisture:＜0.1%
Oil content: do not detect smell: free from extraneous odour
Acidity: meet the GB1917-94 standard
As seen, adopt the present invention can obtain meeting the food-grade carbon-dioxide national standard.
Claims (2)
1, a kind of production method of food-class liquid CO 2, it is characterized in that: it will separate through water separator successively from the carbonic acid gas of battery limit (BL), compressor boosts to 2～2.5MPa, and the organosulfur convertor transforms, and desulfurizer desulfurization and active carbon adsorber take off impurity; The gas that comes out cools off through water cooler, enters water separator, enters molecular sieve purification device and fine filter then successively; Carbon dioxide after the filtration enters pre-cooler, liquefier, enters the Liquid carbon dioxide storage tank at last.
2, the production method of food-class liquid CO 2 as claimed in claim 1, it is characterized in that: described production method specifically is meant: from the carbonic acid gas of battery limit (BL), enter the carbonic acid gas water separator and separate saturation water, enter carbon dioxide compressor, gauge pressure adds to 2～2.5Mpa, be warming up to 80～130 ℃, enter the organosulfur convertor then organosulfur is converted into inorganic sulfur, enter desulfurizer and active carbon adsorber again, organosulfur, inorganic sulfur and part moisture are fallen in absorption, make the sulfur-bearing total amount less than 0.1 milligram/cubic metre; The gas that comes out through water cooler be water-cooled to≤40 ℃, enter the carbonic acid gas water separator and separate saturation water, enter carbon dioxide molecule sieve cleaner and carbonic acid gas fine filter then, thoroughly unwatering, bacterium and peculiar smell make water＜10PPm; Carbon dioxide after the filtration enters the carbon dioxide precooling device and is chilled to-5～0 ℃ in advance, enters the co 2 liquefaction device, makes carbonic acid gas become liquid by gas, and its temperature is-19～-15 ℃, enters the Liquid carbon dioxide storage tank at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001161873A CN1147428C (en) | 2000-10-17 | 2000-10-17 | Process for preparing food-class high-purity liquid CO2 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001161873A CN1147428C (en) | 2000-10-17 | 2000-10-17 | Process for preparing food-class high-purity liquid CO2 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1289720A CN1289720A (en) | 2001-04-04 |
| CN1147428C true CN1147428C (en) | 2004-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001161873A Expired - Fee Related CN1147428C (en) | 2000-10-17 | 2000-10-17 | Process for preparing food-class high-purity liquid CO2 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339149C (en) * | 2002-11-20 | 2007-09-26 | 中国科学院大连化学物理研究所 | Co2 pressured purifying liquefying method and device and use in area refrigeration |
| CN101040674B (en) * | 2007-04-29 | 2010-12-01 | 湖南凯美特气体股份有限公司 | Method for producing food level liquid carbon dioxide product |
| CN101871717B (en) * | 2010-07-01 | 2011-11-09 | 代建钢 | Complete equipment for CO2 recycling with CO2 vaporization and cool recycling device |
| CN102410703B (en) * | 2011-08-12 | 2014-07-16 | 湖南凯美特气体股份有限公司 | Improved method for producing food grade liquid carbon dioxide product and distillation and purification tower |
| CN102410704B (en) * | 2011-08-12 | 2013-11-06 | 湖南凯美特气体股份有限公司 | Production method of food grade liquid carbon dioxide product for recycling resurgent gases |
| CN102502633A (en) * | 2011-10-24 | 2012-06-20 | 湖北三宁化工股份有限公司 | Fine desulfurization pretreatment method for carbon dioxide (CO2) for synthesizing urea |
| CN102706102B (en) * | 2012-05-09 | 2014-12-10 | 深圳市明鑫高分子技术有限公司 | System and method for purifying carbon dioxide in flue gas |
| CN102828371A (en) * | 2012-07-17 | 2012-12-19 | 大连工业大学 | Diversified integrated dyeing device for supercritical carbon dioxide |
| CN105883807B (en) * | 2016-04-11 | 2017-03-22 | 辽宁洁镁科技有限公司 | Method for purifying carbon dioxide as by-product in magnesite processing |
| CN106348297B (en) * | 2016-08-25 | 2018-09-04 | 重庆同辉气体有限公司 | The technique for producing food-grade carbon-dioxide using the resolution gas of synthesis ammonia MDEA method decarbonization process |
| WO2018094762A1 (en) * | 2016-11-25 | 2018-05-31 | 南通盛世王朝家纺设计有限公司 | Carbon dioxide recovery system for supercritical carbon dioxide dyeing equipment |
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2000
- 2000-10-17 CN CNB001161873A patent/CN1147428C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1289720A (en) | 2001-04-04 |
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