CN101270042B - Method for separating calcium sulphate in lactic acid production - Google Patents
Method for separating calcium sulphate in lactic acid production Download PDFInfo
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- CN101270042B CN101270042B CN2008100496444A CN200810049644A CN101270042B CN 101270042 B CN101270042 B CN 101270042B CN 2008100496444 A CN2008100496444 A CN 2008100496444A CN 200810049644 A CN200810049644 A CN 200810049644A CN 101270042 B CN101270042 B CN 101270042B
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Abstract
The present invention relates to a method used for separating calcium sulfate in the production of lactic acid. The concentrated solution of calcium lactate is heated until crystals are completely dissolved; sulfuric acid is added for acidolysis so that the reaction can be fully completed to prepare decomposing material solution; ammonium oxalate and barium chloride are used for testing; the decomposing terminal is controlled to be slightly in excess; after 3 to 6 hours, the reaction terminal is adjusted to be in balance to prevent the excess of the sulfuric acid, lower the viscosity of the material solution and prevent the production of slightly soluble calcium sulfate; after the reaction, the material solution is heated to boil and is continuously mixed to form lamellar crystals; a belt filter is used for filtering; the filtrate is filtered again by an ultrafiltration membrane; the treated solution is treated according to the ordinary way in the next process. In the method, the belt filter reduces the occupied area, solves the problem of the crossflow of sewage that has caused trouble in production for a plurality of years, and improves the production environment. The automated operation lowers the labor intensity, and improves the operating conditions. The equipment has the advantages of simple structure, small size, light weight and low investment in infrastructure. The method greatly improves the production efficiency and saves the labor power and materials.
Description
Technical field:
The present invention relates to the separation method in a kind of lactic acid-producing, relate in particular to a kind of method of utilizing the band filter separating calcium sulphate in lactic acid-producing, it not only can move continuously, and can also improve the yield of product.
Background technology:
At present, in fermentation industry, extensively adopt flame filter press or horizontal centrifuge separating calcium sulphate, and widely apply in the lactic fermentation factory that builds or building, there is following problems: 1, adopt flame filter press to filter filter residue, cake moisture is lower, but labour intensity is very big, and production efficiency is low.Though 2, horizontal centrifuge can improve efficiency greatly, has reduced labour intensity, because the restriction of equipment, can't guarantee the water content of filter residue, can't guarantee the yield of product.Fermentation industry is as the high pollution industry, the problem that always perplexs us is exactly the minimizing contamination level of how to try one's best, and adopt traditional Plate Filtration, though the high advantage of its yield is arranged, do the wash filter cloth and produced a large amount of sour waters again, increased environmental pollution greatly, and the employing horizontal centrifuge, though do not have above-mentioned situation, because water content height itself, put into the acidification that causes that environment also can be serious.
Summary of the invention:
The objective of the invention is striding forward in the process to mass-producing, automatization at above-mentioned big-and-middle-sized lactic acid-producing enterprise; use the problem that method occurred of traditional separating calcium sulphate; and provide a kind of method of in lactic acid-producing, utilizing the band filter separating calcium sulphate; it not only can move continuously; and can also improve the yield of product; waste residue greatly reduces the pollution to environment because acid content is few simultaneously.
Technical scheme of the present invention realizes with following method:
The method of separating calcium sulphate in a kind of lactic acid-producing, the calcium lactate solution that concentrates 35%-45% of learning from else's experience is heated, after dissolving fully to crystal, the sulfuric acid that adds content and be 45%-55% carries out acidolysis, the limit adds sour limit and stirs, react fully thoroughly, be made as the decomposition feed liquid, for basic condition is created in the long-term normal operation that guarantees band filter; Ammonium oxalate with 5% and 5% bariumchloride reagent detect, and the control decomposing terminal is excessive slightly, after 3-6 hour, reaction end is adjusted to balance, prevents excess sulfuric acid, reduce the feed liquid viscosity, are beneficial to band filter and filter, and prevent to produce sl. sol. calcium sulfate; Reaction is warming up to boiling after finishing, keep stirring 8-10 hour, after forming tabular crystal, begin to filter with band filter, wherein, this machine is a medium with filter cloth or filter screen, and feed liquid places on the filtration medium by the sparger level, the sparger bore is 75 centimetres-85 centimetres, the filter cloth aperture is the 200-250 order, makes full use of feed liquid gravity and pull of vacuum and realizes solid-liquid separation, and pull of vacuum is 2-3Kg, wash water divides three grades, the wash water flow is 400kg/h, and by multistage wash water, has reduced the rate of loss of lactic acid in the calcium sulfate slag, filtrate is used the ultrafiltration membrance filter of 0.4-0.6 micron again, and treatment solution enters subsequent processing and handles in the usual way.
The present invention can also be achieved in that the ultra-filtration membrane aperture is 0.5 micron.
It is that 40% calcium lactate solution is heated that the present invention can also be achieved in that degree of enrichment, and the Heating temperature of calcium lactate solution is 75 ℃-85 ℃.
The invention has the beneficial effects as follows:
1, the vacuum band-type filter machine of the present invention's application is to adopt continuous horizontal vacuum band-type to filter, applicable to the material under the multiple concentration conditions, and the filtration efficiency height.
2, the present invention adopts band filter to reduce floor space greatly, has solved the sewage crossing current phenomenon that puzzlement is for many years produced, and has improved production environment.
3, the present invention can automatic feed, discharging, automatic deflection adjusting, wash the operation automation of strainer automatically, reduced labour intensity and improved operational condition.
4, the used device structure of the present invention is simple, volume is little, in light weight, initial cost is few.
5, applied range of the present invention only need be changed the various suspended materials of strainer with regard at least 75 microns in energy filtering particle footpath during use, improved production efficiency greatly, has reduced labour intensity, has saved manpower and materials.
6, the waste residue produced of the present invention is because acid content is few, adds that waste residue carries out the secondary flushing in the production process, improved the production of units yield, and pulp water part can reach 50%-60%, and acid content reduces to 0.2%, for lactic acid-producing has improved efficient.
Embodiment:
Below in conjunction with embodiment technical scheme of the present invention is further described:
Embodiment one:
The method of separating calcium sulphate in a kind of lactic acid-producing, learn from else's experience and concentrate 40% calcium lactate solution and heat, its temperature is 80 ℃, after dissolving fully to crystal, add content and be 50% sulfuric acid and carry out acidolysis, the limit adds sour limit stirs, and reacts fully thoroughly, be made as the decomposition feed liquid, for basic condition is created in the long-term normal operation that guarantees band filter; Ammonium oxalate with 5% and 5% bariumchloride reagent detect, and the control decomposing terminal is excessive slightly, after 3 hours, reaction end is adjusted to balance, prevents excess sulfuric acid, reduce the feed liquid viscosity, are beneficial to band filter and filter, and prevent to produce sl. sol. calcium sulfate; Reaction is warming up to boiling after finishing, keep stirring 9 hours, after forming tabular crystal, begin to filter with band filter, this machine of band filter is that 220 purpose terylene filter clothes are medium with the aperture, making the feed liquid 'go'gage is that 80 centimetres sparger level places on the filtration medium, makes full use of feed liquid gravity and 2.5Kg pull of vacuum and realizes solid-liquid separation; Filtrate is used 0.4 micron ultrafiltration membrance filter again, and treatment solution enters subsequent processing and handles in the usual way.
Embodiment two:
The method of separating calcium sulphate in a kind of lactic acid-producing, learn from else's experience and concentrate 45% calcium lactate solution and heat, its temperature is 82 ℃, after dissolving fully to crystal, add content and be 55% sulfuric acid and carry out acidolysis, the limit adds sour limit stirs, and reacts fully thoroughly, be made as the decomposition feed liquid, for basic condition is created in the long-term normal operation that guarantees band filter; Ammonium oxalate with 5% and 5% bariumchloride reagent detect, and the control decomposing terminal is excessive slightly, after 4 hours, reaction end is adjusted to balance, prevents excess sulfuric acid, reduce the feed liquid viscosity, are beneficial to band filter and filter, and prevent to produce sl. sol. calcium sulfate; Reaction is warming up to boiling after finishing, keep stirring 8.5 hours, after forming tabular crystal, begin to filter with band filter, this machine of band filter is that 230 purpose terylene filter clothes are medium with the aperture, making the feed liquid 'go'gage is that 83 centimetres sparger level places on the filtration medium, makes full use of feed liquid gravity and 2Kg pull of vacuum and realizes solid-liquid separation; Filtrate is used 0.5 micron ultrafiltration membrance filter again, and treatment solution enters subsequent processing and handles in the usual way.
Embodiment three:
The method of separating calcium sulphate in a kind of lactic acid-producing, learn from else's experience and concentrate 40% calcium lactate solution and heat, its temperature is 80 ℃, after dissolving fully to crystal, add content and be 50% sulfuric acid and carry out acidolysis, the limit adds sour limit stirs, and reacts fully thoroughly, be made as the decomposition feed liquid, for basic condition is created in the long-term normal operation that guarantees band filter; Ammonium oxalate with 5% and 5% bariumchloride reagent detect, and the control decomposing terminal is excessive slightly, after 6 hours, reaction end is adjusted to balance, prevents excess sulfuric acid, reduce the feed liquid viscosity, are beneficial to band filter and filter, and prevent to produce sl. sol. calcium sulfate; Reaction is warming up to boiling after finishing, keep stirring 8 hours, after forming tabular crystal, begin to filter with band filter, this machine of band filter is that 250 purpose terylene filter clothes are medium with the aperture, making the feed liquid 'go'gage is that 79 centimetres sparger level places on the filtration medium, makes full use of feed liquid gravity and pull of vacuum and realizes solid-liquid separation; Filtrate is used 0.6 micron ultrafiltration membrance filter again, and treatment solution enters subsequent processing and handles in the usual way.
Claims (6)
1. the method for separating calcium sulphate in the lactic acid-producing, the calcium lactate solution that concentrates 35%-45% of learning from else's experience is heated, after dissolving fully to crystal, add content and be 45%55% sulfuric acid and carry out acidolysis, the limit adds sour limit and stirs, react fully thoroughly, be made as the decomposition feed liquid, for basic condition is created in the long-term normal operation that guarantees band filter; Ammonium oxalate with 5% and 5% bariumchloride reagent detect, and the control decomposing terminal is excessive slightly, after 3-6 hour, reaction end is adjusted to balance, prevents excess sulfuric acid, reduce the feed liquid viscosity, are beneficial to band filter and filter, and prevent to produce sl. sol. calcium sulfate; Reaction is warming up to boiling after finishing, keep stirring 8-10 hour, after forming tabular crystal, begin to filter with band filter, it is characterized in that: band filter is a medium with filter cloth or filter screen, feed liquid places on the filtration medium by the sparger level, make full use of feed liquid gravity and pull of vacuum and realize solid-liquid separation, and reduce the rate of loss of lactic acid in the calcium sulfate slag by multistage washing, filtrate is used the ultrafiltration membrance filter of 0.4-0.6 micron again, and treatment solution enters subsequent processing and handles in the usual way.
2. the method for separating calcium sulphate in a kind of lactic acid-producing according to claim 1 is characterized in that: described filter cloth aperture is the 200-250 order.
3. the method for separating calcium sulphate in a kind of lactic acid-producing according to claim 1 is characterized in that: described sparger bore is 75 centimetres-85 centimetres.
4. the method for separating calcium sulphate in a kind of lactic acid-producing according to claim 1 is characterized in that: described pull of vacuum is 2-3Kg, and washing divides three grades, and the washing flow is 400kg/h.
5. the method for separating calcium sulphate in a kind of lactic acid-producing according to claim 1 is characterized in that: described ultra-filtration membrane aperture is 0.5 micron.
6. the method for separating calcium sulphate in a kind of lactic acid-producing according to claim 1 is characterized in that: the calcium lactate solution that concentrates 35%-45% of learning from else's experience is heated, and the Heating temperature of calcium lactate solution is 75 ℃-85 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100496444A CN101270042B (en) | 2008-04-28 | 2008-04-28 | Method for separating calcium sulphate in lactic acid production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100496444A CN101270042B (en) | 2008-04-28 | 2008-04-28 | Method for separating calcium sulphate in lactic acid production |
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| Publication Number | Publication Date |
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| CN101270042A CN101270042A (en) | 2008-09-24 |
| CN101270042B true CN101270042B (en) | 2010-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2484674A (en) * | 2010-10-18 | 2012-04-25 | Plaxica Ltd | Process for producing a lactic acid-amine complex |
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Free format text: FORMER OWNER: RESEARCH CENTER OF PRECISE COPPER PIPE ENGINEERING, CHINESE ACADEMY OF SCIENCES |
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Address after: 477150 east section of North Ring Road, Dancheng County, Henan Patentee after: Henan Jindan Lactic Acid Technology Co., Ltd. Address before: 477150 east section of North Ring Road, Dancheng County, Henan Patentee before: Henan Jindan Lactic Acid Co., Ltd. |
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Owner name: HE NAN JINDAN LACTIC ACID TECH. CO., LTD. Free format text: FORMER NAME: HENAN JINDAN LACTIC ACID TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 477150 east section of North Ring Road, Dancheng County, Henan Patentee after: Henan Jindan Lactic Acid Tech Co.,Ltd. Address before: 477150 east section of North Ring Road, Dancheng County, Henan Patentee before: Henan Jindan Lactic Acid Technology Co., Ltd. |