CN105237386A - Environment-friendly lactic acid production technology - Google Patents
Environment-friendly lactic acid production technology Download PDFInfo
- Publication number
- CN105237386A CN105237386A CN201510700802.8A CN201510700802A CN105237386A CN 105237386 A CN105237386 A CN 105237386A CN 201510700802 A CN201510700802 A CN 201510700802A CN 105237386 A CN105237386 A CN 105237386A
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- China
- Prior art keywords
- lactic acid
- acid solution
- friendly
- environment
- calcium lactate
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses an environment-friendly lactic acid production technology. Main chemical raw materials for producing lactic acid comprise calcium lactate and sulfuric acid. The lactic acid production technology mainly comprises metathesis (displacement reaction), decoloring, concentration, ion exchange and refining. The environment-friendly lactic acid production technology is simple in technological process, rapid in reaction and short in production period, is suitable for large-scale continuous production, free of exhaust gas and wastewater discharge in the whole lactic acid preparation process, is friendly to environment, is safe in operation by utilizing anionic and cationic resin for removing ions, and is capable of thoroughly completely removing dissociative anions and cations in crude lactic acid for obtaining a pure lactic acid solution. The produced lactic acid is nontoxic and environment-friendly, accords with green and environment-friendly requirements, and can reach domestic and international standards even food-grade standards.
Description
Technical field
The invention belongs to the producing and manufacturing technique field of lactic acid, relate to a kind of environmental protection, free of contamination lactic acid production process method in particular.
Background technology
Lactic acid is widely used in food, medicine, industry, agricultural, multiple field such as daily use chemicals and industry, along with the development of our technology, the application of lactic acid can be more extensive, but, in prior art, industrial production lactic acid method mainly fermentation method and chemical synthesis, fermentation method because of its technique simple, raw material is sufficient, development comparatively early becomes the production method of lectic acid of comparative maturity, account for more than 70 of lactic acid-producing, but the cycle is long, can only interval or semi-continuous production, and domestic lactic acid-fermenting quality does not reach international standard, chemical synthesis can realize the large-scale continuous production of lactic acid, and synthesizing lactic acid has also obtained the accreditation of U.S. food and drug administration (FDA), but raw material generally has toxicity, do not meet Green Chemistry requirement, so, a kind of environmental protection of urgent need research, nontoxic, scale operation can be realized, the lactic acid production process that cycle is short.
Summary of the invention
That the object of the present invention is to provide a kind of environmental protection, that nontoxic, that can realize scale operation, the cycle is short lactic acid production process.
The lactic acid production process of a kind of environmental protection of technical solution of the present invention, the primary chemical raw material of described lactic acid-producing has: calcium lactate and sulfuric acid;
Described lactic acid production process mainly comprises: metathesis, decolouring, concentrated, ion-exchange and refining;
The step of described lactic acid production process is as follows:
The first step, metathetical is for lactic acid solution
First, in reactor, drop into calcium lactate and water, heating is also slowly stirred, and treats that calcium lactate white powder dissolves completely, in reactor, adds water, regulate calcium lactate solution concentration to be 21%;
Then, in reactor, slowly add the sulphuric acid soln that concentration is 45%, fully stir, leave standstill 4 hours, treat that calcium lactate all participates in chemical reaction and is converted into lactic acid and calcium sulfate completely, and utilize ammonium chloride to correct calcium lactate reaction end, filter, obtain rare lactic acid solution;
Second step, decolouring
Add gac directly in rare lactic acid solution obtained in the first step, leave standstill 30 minutes, treat that gac realizes decolouring completely to rare lactic acid solution, filter, obtain colourless rare lactic acid solution;
3rd step, concentrated
Utilize vacuum concentrator to realize carrying out concentrating under reduced pressure to colourless rare lactic acid solution, thickening temperature asks 85 DEG C, and after concentrated, colourless rare lactic acid solution concentration is 21%, obtains crude lactic acid;
4th step, ion-exchange and refining
Utilize yin and yang resin deionization, the calcium ion, sulfate ion, the muriate that contain in removing crude lactic acid, filter, and filtrate is placed in vacuum concentrator carries out concentrating under reduced pressure, obtained lactic acid solution.
Described yin and yang resin deionization, for utilizing strongly acidic styrene's cation resin decationizing, utilizes weakly alkaline styrene series anion resin to remove negatively charged ion.
The technology of the present invention beneficial effect:
The lactic acid production process of a kind of environmental protection of technical solution of the present invention, technological process is simple, reaction fast, with short production cycle, be applicable to large scale continuous prod, without waste gas, discharge of wastewater in the preparation process of whole lactic acid, environmental protection, utilizes yin and yang resin deionization, operational safety, thoroughly the zwitterion dissociated in crude lactic acid can be removed completely, obtain pure lactic acid solution, the lactic acid asepsis environment-protecting produced, meets the requirement of environmental protection, standard both at home and abroad can be reached, or even food grade standard.
Embodiment
Understand technical solution of the present invention for ease of those skilled in the art, now in conjunction with embodiment, technical solution of the present invention is described further.
First in reactor, calcium lactate powder and water is added, slowly be stirred to calcium lactate to dissolve completely, adding water regulates calcium lactate solution concentration to be 12%, in reactor, add concentration is again 45% sulphuric acid soln, leave standstill 4 hours, treat that calcium lactate total overall reaction is complete, slowly ammonium chloride solution is added in reactor, bubble-free is had to produce in observing response still, if bubble-free produces can represent calcium lactate solution complete reaction, if have bubble to produce sulphuric acid soln quantity not sufficient is described, continue to add sulphuric acid soln and calcium lactate reacts, treat that bubble-free produces, filter, obtain rare lactic acid solution, the gac of 0.2% number of amount of solution is added in rare lactic acid solution, leave standstill 30 minutes, realize the decolouring to rare lactic acid solution, filter, filtrate is placed in vacuum concentrator and carries out concentrating under reduced pressure, being concentrated into lactic acid solution concentration is 21%, lactic acid solution after concentrated is utilized strongly acidic styrene's cation resin decationizing, weakly alkaline styrene series anion resin is utilized to remove negatively charged ion, obtain pure lactic acid solution, pure lactic acid solution is placed in vacuum concentrator and carries out concentrating under reduced pressure, obtain lactic acid.
Technical solution of the present invention is exemplarily described invention in conjunction with embodiment above; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out to improve; or the design of invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (2)
1. a lactic acid production process for environmental protection, is characterized in that,
The primary chemical raw material of described lactic acid-producing has: calcium lactate and sulfuric acid;
Described lactic acid production process mainly comprises: metathesis, decolouring, concentrated, ion-exchange and refining;
The step of described lactic acid production process is as follows:
The first step, metathetical is for lactic acid solution
First, in reactor, drop into calcium lactate and water, heating is also slowly stirred, and treats that calcium lactate white powder dissolves completely, in reactor, adds water, regulate calcium lactate solution concentration to be 21%;
Then, in reactor, slowly add the sulphuric acid soln that concentration is 45%, fully stir, leave standstill 4 hours, treat that calcium lactate all participates in chemical reaction and is converted into lactic acid and calcium sulfate completely, and utilize ammonium chloride to correct calcium lactate reaction end, filter, obtain rare lactic acid solution;
Second step, decolouring
Add gac directly in rare lactic acid solution obtained in the first step, leave standstill 30 minutes, treat that gac realizes decolouring completely to rare lactic acid solution, filter, obtain colourless rare lactic acid solution;
3rd step, concentrated
Utilize vacuum concentrator to realize carrying out concentrating under reduced pressure to colourless rare lactic acid solution, thickening temperature asks 85 DEG C, and after concentrated, colourless rare lactic acid solution concentration is 21%, obtains crude lactic acid;
4th step, ion-exchange and refining
Utilize yin and yang resin deionization, the calcium ion, sulfate ion, the muriate that contain in removing crude lactic acid, filter, and filtrate is placed in vacuum concentrator carries out concentrating under reduced pressure, obtained lactic acid solution.
2. the lactic acid production process of a kind of environmental protection according to claim 1, is characterized in that, described yin and yang resin deionization, for utilizing strongly acidic styrene's cation resin decationizing, utilizes weakly alkaline styrene series anion resin to remove negatively charged ion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510700802.8A CN105237386A (en) | 2015-10-27 | 2015-10-27 | Environment-friendly lactic acid production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510700802.8A CN105237386A (en) | 2015-10-27 | 2015-10-27 | Environment-friendly lactic acid production technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105237386A true CN105237386A (en) | 2016-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510700802.8A Pending CN105237386A (en) | 2015-10-27 | 2015-10-27 | Environment-friendly lactic acid production technology |
Country Status (1)
| Country | Link |
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| CN (1) | CN105237386A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306993A (en) * | 2007-05-14 | 2008-11-19 | 张家港三源生物工程有限公司 | Refine process of L-lactic acid of polymerization grade |
| CN102517346A (en) * | 2011-12-16 | 2012-06-27 | 安徽中粮生化格拉特乳酸有限公司 | Method for preparing L-lactic acid and/or L-lactate |
-
2015
- 2015-10-27 CN CN201510700802.8A patent/CN105237386A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306993A (en) * | 2007-05-14 | 2008-11-19 | 张家港三源生物工程有限公司 | Refine process of L-lactic acid of polymerization grade |
| CN102517346A (en) * | 2011-12-16 | 2012-06-27 | 安徽中粮生化格拉特乳酸有限公司 | Method for preparing L-lactic acid and/or L-lactate |
Non-Patent Citations (2)
| Title |
|---|
| 王慎敏主编: "《实用精细化学品生产工艺1》", 30 September 2008 * |
| 胡维胜: "食用级L-乳酸分离精制工艺的研究", 《中国优秀硕士学位论文全文数据库》 * |
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Application publication date: 20160113 |
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| WD01 | Invention patent application deemed withdrawn after publication |