CN106755137A - A kind of electroosmose process produces the production technology of citric acid - Google Patents
A kind of electroosmose process produces the production technology of citric acid Download PDFInfo
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- CN106755137A CN106755137A CN201510830790.0A CN201510830790A CN106755137A CN 106755137 A CN106755137 A CN 106755137A CN 201510830790 A CN201510830790 A CN 201510830790A CN 106755137 A CN106755137 A CN 106755137A
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Abstract
The present invention provides the production technology that a kind of electroosmose process produces citric acid, and described production technology is comprised the following steps：The first step, produces citric acid fermentation broth；Potato dry grinding, mashing, liquefaction are added in fermentation tank, wheat bran strain is added in fermentation tank, and be passed through filtrated air；Second step, citric acid fermentation broth is filtered；3rd step, citric acid fermentation broth is separated in electric dialyzator, and concentrates 2 times；4th step, depigmentaton and foreign ion are removed with activated carbon and ion exchange, obtain faint yellow, the high-purity citric acid aqueous solution；5th step, high-purity citric acid solution is concentrated, crystallization, is made product.Solve existing Citric Acid Production technique citric acid yield low, unit operational losses are big, seriously polluted, the problem strict to fermentation raw material requirement, there is provided one kind increases citric acid yield, reduces unit consumption loss, reduce environmental pollution, the Citric Acid Production technique not required fermentation raw material.
Description
Technical field
The invention belongs to organic acid preparation technique field, and in particular to a kind of electroosmose process produces the production technology of citric acid.
Background technology
Citric acid is widely used in the industries such as food, medicine, cosmetics, detergent, packaging, metal cleaning, building, environmental protection, and appropriate hundreds of thousands t is needed every year.For many years, growth rate is consumed the year of world's citric acid always 7.5% or so.The method that past citric acid is mainly the present production citric acid of the extraction from the fruits such as lemon, oranges and tangerines, pineapple substantially has two kinds:One kind is chemical synthesis, another kind is biological fermentation process wherein chemical synthesis due to raw material, yield, pollution, it is economical the problems such as cannot compared with fermentation method, rule of fermenting is because abundant raw materials, yield are high, low cost and gain great popularity, so now based on fermentation method production.Citric acid is at present in the world with the organic acid that biochemical method production yields is maximum, the global t of annual production (50 1 60) ten thousand) China is a big producer for citric acid, and critical role is occupied in the international market.Citric acid fermentation broth complicated component, and because raw material different and different with zymotechnique is in addition to citric acid, also include thalline, residual sugar, protein, pigment, colloid, organic heteroacid, the plurality of impurities such as inorganic salts, generally speaking, they derive from raw material, the nutritive salt or the intermediate by-products of fermentation not consumed are in advanced international standard so extracting the direct tank fermentation method technique of potato powder that citric acid is relatively difficult China original creation from citric acid fermentation broth, and independently developed black-koji mould produces sour efficiency and is approached with foreign countries, but in recovery rate, the aspect such as mechanization degree and labor productivity is relatively backward, thus study at home from zymotic fluid efficiently, it is that the method that a very meaningful problem extracts citric acid from citric acid fermentation broth mainly has calcium salt method and extraction that low energy consumption ground extracts citric acid.
Calcium salt method is a kind of traditional method that organic acid is extracted from zymotic fluid, and it is water insoluble using calcium citrate to obtain the most universal in middle national expenditures, but the characteristics of can be dissolved in acid, in the supernatant containing citric acid plus people CaCo3Or Ca (OH)2Neutralize, make citric acid generate calcium citrate to precipitate, after separation of solid and liquid, calcium citrate uses sulfuric acid solution again by washing, generation aqueous citric acid solution, then through decolouring, removal yin, yang heteroion after obtain extract solution enter people concentration, Crystallization Procedure obtain pure citric acid solid product.Calcium salt method is at home and abroad widely used because of the features such as technical maturity, equipment are simple, raw material are easy to get with product quality stabilization but by application so for many years, its defect increasingly appears:One is that citric acid mass fraction is relatively low in the extract solution for obtaining, generally below 20%, increase the load of subsequent concentration section;Two is that unit operational losses are more, and total recovery is low, and domestic manufacturer is little more than 70% typically 60% ~ 70%, lower (China is mainly done as raw material with potato) to doing production technology yield as raw material with potato;Three is that citric acid experienced multiple phase transformation in extraction process, and consumption industrial chemicals is more, and separation of solid and liquid amount is big, high energy consumption;Four is serious environmental pollution, produces substantial amounts of solid waste, and in today that environmental problem becomes increasingly conspicuous, this method does not apply to the demand of environmental protection increasingly.And extraction is stricter to fermentation raw material requirement, it is general to be only used for the better simply zymotic fluid of composition, and because with the addition of extractant, such as separating can not exclusively influence product quality, some extractants are even poisonous, may limit the use scope of citric acid product.
The content of the invention
It is low that the technical problems to be solved by the invention are directed to existing Citric Acid Production technique citric acid yield, unit operational losses are big, it is seriously polluted, it is strict to fermentation raw material requirement, a kind of increase citric acid yield is provided, unit consumption loss is reduced, environmental pollution, the Citric Acid Production technique not required fermentation raw material is reduced.
The technical scheme that present invention solution above-mentioned technical problem is used is as follows：
A kind of electroosmose process produces the production technology of citric acid, it is characterised in that described production technology is comprised the following steps：
The first step, produces citric acid fermentation broth；Potato dry grinding, mashing, liquefaction are added in fermentation tank, wheat bran strain is added in fermentation tank, and be passed through filtrated air；The stronger ventilation condition of citric acid fermentation requirement, is conducive to being maintained in zymotic fluid certain dissolved oxygen content.Ventilation is the main method for increasing dissolved oxygen in culture medium.As thalline is generated, the dissolved oxygen in zymotic fluid can be reduced gradually, so as to inhibit the synthesis of citric acid.Method using air velocity is increased, dissolved oxygen reaches 60% saturation degree to producing acid favorably in making nutrient solution.
Second step, citric acid fermentation broth pretreatment；Citric acid fermentation broth is filtered；
3rd step, citric acid fermentation solution electrodialysis；Citric acid fermentation broth is separated in electric dialyzator, and concentrates 2 times；
4th step, decolouring, ion exchange；Depigmentaton and foreign ion are removed with activated carbon and ion exchange, faint yellow, the high-purity citric acid aqueous solution is obtained；
5th step, condensing crystallizing；High-purity citric acid solution is concentrated, crystallization, is made product.
The principle that electric dialyzator extracts citric acid is using the selective penetrated property of anions and canons exchange membrane, the citrate in mixed liquor and thousand are separated respectively in the presence of electric field force, generation citric acid, without the transition step in ion-exchange, so its process is simple;Again because being acidified two procedures without calcium citrate precipitation and calcium citrate, citric acid loss is few, and the rate of recovery can reach 85%;Not to adding any chemical reagent in system, will not discharge harmful pollution environment, do not interfere with product quality yet.The working environment of workman improves, and producers reduce half, with short production cycle, easily realize technology.
Further, the fermentation temperature in the fermentation tank is 28 ~ 30 DEG C.Temperature is too high to cause thalline amount reproduction, and sugar is reduced by a large amount of consumption so that producing acid, while also generating more oxalic acid and gluconic acid；The too low then longer fermentation times of temperature.
Further, it is described to cross electrodialysis for bipolar membrane electrodialysis.
Further, one film of the electric dialyzator includes Bipolar Membrane, cavity block and each one of anode membrane, there is 3 rooms:Sour room, alkali room and feed liquid room.It is divided into 3 kinds by extract solution after this electric dialyzator:For the more common electrodialysis of this methods of the feed liquid of acid solution, alkali lye and dilution based on citric acid, it neutralize zymotic fluid obvious advantage is that the alkali that alkali room is produced can be recycled, can not only separation of citric acid, it can also be concentrated simultaneously, technology is simple.
Further, the activated carbon is granular activated carbon.
Further, the crystallization time is 10 ~ 12h.
Further, the film is polysulfones film.Due to containing the impurity such as a large amount of protein, sugar, pigment, mould in zymotic fluid, it is necessary to select the acidproof milipore filter of suitable hole, such as all good polysulfones film of inoxidizability and acid resistance, the short CA films of service life should not be selected.
Specific embodiment
In order that technical problem solved by the invention, technical scheme and beneficial effect become more apparent, with reference to embodiments, the present invention is described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., should be included within the scope of the present invention.
Embodiment 1
The production technology that a kind of electroosmose process produces citric acid is comprised the following steps：
The first step, produces citric acid fermentation broth；Potato dry grinding, mashing, liquefaction are added in fermentation tank, wheat bran strain is added in fermentation tank, and be passed through filtrated air；Fermentation temperature in fermentation tank is 28 DEG C；
Second step, citric acid fermentation broth pretreatment；Citric acid fermentation broth is filtered；
3rd step, citric acid fermentation broth bipolar membrane electrodialysis；Citric acid fermentation broth is separated in electric dialyzator, and concentrates 2 times；One film of the electric dialyzator includes Bipolar Membrane, cavity block and each one of anode membrane, there is 3 rooms:Sour room, alkali room and feed liquid room；The film is polysulfones film.
4th step, decolouring, ion exchange；Depigmentaton and foreign ion are removed with granular activated carbon and ion exchange, faint yellow, the high-purity citric acid aqueous solution is obtained；
5th step, condensing crystallizing；High-purity citric acid solution is concentrated, crystallization 12h, is made product.
Embodiment 2
The production technology that a kind of electroosmose process produces citric acid is comprised the following steps：
The first step, produces citric acid fermentation broth；Potato dry grinding, mashing, liquefaction are added in fermentation tank, wheat bran strain is added in fermentation tank, and be passed through filtrated air；Fermentation temperature in fermentation tank is 30 DEG C；
Second step, citric acid fermentation broth pretreatment；Citric acid fermentation broth is filtered；
3rd step, citric acid fermentation broth bipolar membrane electrodialysis；Citric acid fermentation broth is separated in electric dialyzator, and concentrates 2 times；One film of the electric dialyzator includes Bipolar Membrane, cavity block and each one of anode membrane, there is 3 rooms:Sour room, alkali room and feed liquid room；The film is polysulfones film.
4th step, decolouring, ion exchange；Depigmentaton and foreign ion are removed with granular activated carbon and ion exchange, faint yellow, the high-purity citric acid aqueous solution is obtained；
5th step, condensing crystallizing；High-purity citric acid solution is concentrated, crystallization 10h, is made product.
Embodiment 3
The production technology that a kind of electroosmose process produces citric acid is comprised the following steps：
The first step, produces citric acid fermentation broth；Potato dry grinding, mashing, liquefaction are added in fermentation tank, wheat bran strain is added in fermentation tank, and be passed through filtrated air；Fermentation temperature in fermentation tank is 29 DEG C；
Second step, citric acid fermentation broth pretreatment；Citric acid fermentation broth is filtered；
3rd step, citric acid fermentation broth bipolar membrane electrodialysis；Citric acid fermentation broth is separated in electric dialyzator, and concentrates 2 times；One film of the electric dialyzator includes Bipolar Membrane, cavity block and each one of anode membrane, there is 3 rooms:Sour room, alkali room and feed liquid room；The film is polysulfones film.
4th step, decolouring, ion exchange；Depigmentaton and foreign ion are removed with granular activated carbon and ion exchange, faint yellow, the high-purity citric acid aqueous solution is obtained；5th step, condensing crystallizing；High-purity citric acid solution is concentrated, crystallization 11h, is made product.
Claims (7)
1. a kind of electroosmose process produces the production technology of citric acid, it is characterised in that described production technology is comprised the following steps：
The first step, produces citric acid fermentation broth；Potato dry grinding, mashing, liquefaction are added in fermentation tank, wheat bran strain is added in fermentation tank, and be passed through filtrated air；
Second step, citric acid fermentation broth pretreatment；Citric acid fermentation broth is filtered；
3rd step, citric acid fermentation solution electrodialysis；Citric acid fermentation broth is separated in electric dialyzator, and concentrates 2 times；
4th step, decolouring, ion exchange；Depigmentaton and foreign ion are removed with activated carbon and ion exchange, faint yellow, the high-purity citric acid aqueous solution is obtained；
5th step, condensing crystallizing；High-purity citric acid solution is concentrated, crystallization, is made product.
2. electroosmose process according to claim 1 produces the production technology of citric acid, it is characterised in that the fermentation temperature in the fermentation tank is 28 ~ 30 DEG C.
3. electroosmose process according to claim 1 produces the production technology of citric acid, it is characterised in that described to cross electrodialysis for bipolar membrane electrodialysis.
4. electroosmose process according to claim 3 produces the production technology of citric acid, it is characterised in that one film of the electric dialyzator includes Bipolar Membrane, cavity block and each one of anode membrane, there is 3 rooms:Sour room, alkali room and feed liquid room.
5. electroosmose process according to claim 1 produces the production technology of citric acid, it is characterised in that the activated carbon is granular activated carbon.
6. electroosmose process according to claim 1 produces the production technology of citric acid, it is characterised in that the crystallization time is 10 ~ 12h.
7. electroosmose process according to claim 3 produces the production technology of citric acid, it is characterised in that the film is polysulfones film.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112521274A (en) * | 2020-12-21 | 2021-03-19 | 杭州蓝然环境技术股份有限公司 | Process for extracting citric acid from fermentation liquor |
| CN114426481A (en) * | 2021-12-30 | 2022-05-03 | 福建省延润膜环保科技有限公司 | Method for producing citric acid by biological fermentation coupled bipolar membrane electrodialysis technology |
Citations (4)
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|---|---|---|---|---|
| US5532148A (en) * | 1995-08-30 | 1996-07-02 | Ntec, Inc. | Process for producing of citric acid and monovalent citrate salts |
| CN1673385A (en) * | 2004-03-25 | 2005-09-28 | 刘华祥 | Method for producing citrin and saponin from tuber crops by biotechnology |
| CN101781190A (en) * | 2010-03-23 | 2010-07-21 | 安徽丰原发酵技术工程研究有限公司 | Method for extracting refined citric acid from citric acid fermentation liquid |
| CN103693787A (en) * | 2013-12-18 | 2014-04-02 | 潍坊英轩实业有限公司 | Purification treatment technology of sodium citrate crystalline mother solution |
-
2015
- 2015-11-25 CN CN201510830790.0A patent/CN106755137A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5532148A (en) * | 1995-08-30 | 1996-07-02 | Ntec, Inc. | Process for producing of citric acid and monovalent citrate salts |
| CN1673385A (en) * | 2004-03-25 | 2005-09-28 | 刘华祥 | Method for producing citrin and saponin from tuber crops by biotechnology |
| CN101781190A (en) * | 2010-03-23 | 2010-07-21 | 安徽丰原发酵技术工程研究有限公司 | Method for extracting refined citric acid from citric acid fermentation liquid |
| CN103693787A (en) * | 2013-12-18 | 2014-04-02 | 潍坊英轩实业有限公司 | Purification treatment technology of sodium citrate crystalline mother solution |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112521274A (en) * | 2020-12-21 | 2021-03-19 | 杭州蓝然环境技术股份有限公司 | Process for extracting citric acid from fermentation liquor |
| CN114426481A (en) * | 2021-12-30 | 2022-05-03 | 福建省延润膜环保科技有限公司 | Method for producing citric acid by biological fermentation coupled bipolar membrane electrodialysis technology |
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