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Method for separating calcium sulphate in lactic acid production

A technology of calcium sulfate and calcium lactate, which is applied in the preparation of calcium/strontium/barium sulfate and carboxylate, can solve the problems of inability to guarantee the water content of filter residue, inability to guarantee product yield, increase environmental pollution, etc., and save manpower Material resources, improvement of production environment, and improvement of operating conditions

Active Publication Date: 2010-07-28
河南金丹乳酸科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the fermentation industry, plate and frame filters or horizontal centrifuges are widely used to separate calcium sulfate, and they are widely used in lactic acid fermentation plants that have been built or are under construction. There are the following problems: 1. Use plate and frame filters to filter filter residues , the water content of the filter cake is relatively low, but the labor intensity is very high and the production efficiency is low
2. Although the horizontal centrifuge can greatly improve the labor efficiency and reduce the labor intensity, due to the limitation of the equipment, the water content of the filter residue cannot be guaranteed, and the yield of the product cannot be guaranteed
As a high-pollution industry, the fermentation industry has always troubled us with how to reduce the amount of pollution as much as possible. Although the traditional plate and frame filtration has the advantage of high yield, a large amount of acid water is produced when the filter cloth is washed. Greatly increased environmental pollution, and the use of horizontal centrifuges, although there is no such situation, but due to its high water content, it will also seriously cause land acidification when placed in the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for separating calcium sulfate in the production of lactic acid. Take the concentrated 40% calcium lactate solution and heat it at 80°C. After the crystals are completely dissolved, add sulfuric acid with a content of 50% for acidolysis, and stir while adding acid , to make the reaction fully and thoroughly, and make it into a decomposed feed liquid, creating basic conditions for ensuring the long-term normal operation of the belt filter; use 5% ammonium oxalate and 5% barium chloride reagents to detect, control the decomposition end point to a little excessive, 3 hours Finally, adjust the end point of the reaction to be balanced to prevent excessive sulfuric acid, reduce the viscosity of the feed liquid, facilitate the filtration of the belt filter, and prevent the production of slightly soluble calcium sulfate; after the reaction is completed, the temperature is raised to boiling and kept stirring for 9 hours until the formation of flakes After crystallization...

Embodiment 2

[0019] A method for separating calcium sulfate in the production of lactic acid. Take the concentrated 45% calcium lactate solution and heat it at 82°C. After the crystals are completely dissolved, add sulfuric acid with a content of 55% for acid hydrolysis, and stir while adding acid , to make the reaction fully and thoroughly, and make it into a decomposed feed liquid, creating basic conditions for ensuring the long-term normal operation of the belt filter; use 5% ammonium oxalate and 5% barium chloride reagents to detect, control the decomposition end point slightly excessive, 4 hours Finally, adjust the end point of the reaction to be balanced to prevent excessive sulfuric acid, reduce the viscosity of the feed liquid, facilitate the filtration of the belt filter, and prevent the production of slightly soluble calcium sulfate; after the reaction is completed, the temperature is raised to boiling, and kept stirring for 8.5 hours until the formation of flakes After crystalliz...

Embodiment 3

[0021] A method for separating calcium sulfate in the production of lactic acid. Take the concentrated 40% calcium lactate solution and heat it at 80°C. After the crystals are completely dissolved, add sulfuric acid with a content of 50% for acidolysis, and stir while adding acid , to make the reaction fully and thoroughly, and make it into a decomposed feed liquid, which creates basic conditions for ensuring the long-term normal operation of the belt filter; use 5% ammonium oxalate and 5% barium chloride reagents to detect, control the decomposition end point slightly excessive, 6 hours Finally, adjust the end point of the reaction to be balanced to prevent excessive sulfuric acid, reduce the viscosity of the feed liquid, facilitate the filtration of the belt filter, and prevent the production of slightly soluble calcium sulfate; after the reaction is completed, the temperature is raised to boiling, and kept stirring for 8 hours until the formation of flakes After crystallizat...

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PUM

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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 beltfilter 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 beltfilter 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: [0001] The invention relates to a separation method in the production of lactic acid, in particular to a method for separating calcium sulfate by using a belt filter in the production of lactic acid, which can not only operate continuously, but also improve the yield of the product. Background technique: [0002] At present, in the fermentation industry, plate and frame filters or horizontal centrifuges are widely used to separate calcium sulfate, and they are widely used in lactic acid fermentation plants that have been built or are under construction. There are the following problems: 1. Use plate and frame filters to filter filter residues , the water content of the filter cake is relatively low, but the labor intensity is very high and the production efficiency is low. 2. Although the horizontal centrifuge can greatly improve the labor efficiency and reduce the labor intensity, due to the limitation of the equipment, the water content of the filter resid...

Claims

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Application Information

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IPC IPC(8): C07C51/02C07C59/08C01F11/46
Inventor 张鹏于培星崔耀军刘哲王然明王心学郭廷张国宣李冰刘聚胜
Owner 河南金丹乳酸科技股份有限公司