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Vitamin C clean production method

A technology of clean production and vitamins, applied in the direction of organic chemistry, etc., to achieve the effect of reducing investment costs, solving environmental pollution, and reducing production costs

Inactive Publication Date: 2009-01-28
陈星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a clean production method of vitamin C that neither produces a large amount of sewage nor causes yield loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: the sodium guronate solution that is made with existing technology method, add the concentrated sulfuric acid that mass fraction is 70% in sodium guronate solution, adjust solution pH to 3.5; Then the solution membrane ultrafiltration after above-mentioned adjustment pH , remove protein; add mass fraction in the solution after ultrafiltration and be 98.3% concentrated sulfuric acid, adjust pH to 1.65; Concentrate, crystallize, centrifuge and make gulong acid and Na after the solution of above-mentioned pH to 1.65 is decolorized with active carbon 2 SO 4 The mixed dry product; dissolve the above mixed dry product in methanol, wherein the feed ratio of mixed dry product and methanol is: every 1000kg mixed dry product is dissolved to 3m 3 The methanol solution of gulonic acid was filtered to obtain the methanol solution of gulong acid; finally, Vc-Na and Vc were prepared from the methanol solution of gulong acid by using the existing process steps.

Embodiment 2

[0010] Embodiment 2: the sodium guronate solution that is made with existing technology method, add the concentrated sulfuric acid that mass fraction is 98% in sodium guronate solution, adjust solution pH to 4; Then the solution membrane ultrafiltration after above-mentioned adjustment pH ; In the solution after ultrafiltration, add the concentrated sulfuric acid that mass fraction is 98%, adjust PH to 1.65; Concentrate, crystallize, centrifuge and make gulong acid and Na after the solution of above-mentioned PH to 1.65 2 SO 4 The mixed dry product; dissolve the above mixed dry product in methanol, wherein the feed ratio of mixed dry product and methanol is: every 1000kg mixed dry product is dissolved to 7m 3 The methanol solution of gulonic acid was filtered to obtain the methanol solution of gulong acid; finally, Vc-Na and Vc were prepared from the methanol solution of gulong acid by using the existing process steps.

Embodiment 3

[0011] Embodiment 3: the sodium guronate solution that is made with existing technology method, add the concentrated hydrochloric acid that mass fraction is 36% in sodium guronate solution, adjust solution pH to 3.0; Then the solution membrane ultrafiltration after above-mentioned adjustment pH Add concentrated hydrochloric acid with a mass fraction of 36% to the solution after ultrafiltration to adjust the pH to 1.6; decolorize the solution with the above pH to 1.6, concentrate, crystallize, and centrifuge to obtain a mixed dry product of gulong acid and NaCl; Dissolve the above mixed dry product in methanol, wherein the feed ratio of mixed dry product and methanol is: every 1000kg mixed dry product is dissolved to 6m 3 The methanol solution of gulonic acid was filtered to obtain the methanol solution of gulong acid; finally, Vc-Na and Vc were prepared from the methanol solution of gulong acid by using the existing process steps.

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Abstract

The invention discloses a cleaner production method of Vitamin C. In the method, the steps of converting sodium gulonic acid into gulonic acid are as follows: a. strong acid is added into sodium gulonic acid solution and then the pH of the solution is regulated to be 3.0 to 4.5; b. the solution film with the regulated pH is ultrafiltered; c. the strong acid is added into the ultrafiltered solution so as to regulate the pH to be 1.6 to 1.7; d. the solution with regulated pH in step c is subjected to concentration, crystallization and centrifugation so as to prepare mixed dry products; e. the mixed dry products are dissolved in methanol and then filtered so as to prepare the methanol solution of the gulonic acid. The production method of the invention has the advantages that a large amount of water, caustic soda liquid and hydrochloric acids are saved, and basically no sewage is discharged in the process of conversion, thereby solving the problem of environmental contamination, and meeting the discharge standard prescribed by the state. The production method has basically no loss on yield in the process of conversion, thereby greatly reducing investment and production costs.

Description

technical field [0001] The invention relates to the field of pharmaceutical production, in particular to a clean production method of vitamin C. Background technique [0002] At present, vitamin C (Vc) production enterprises generally adopt the ion exchange method to transform the sodium gulonic acid solution into the gulong acid solution, then concentrate, crystallize, and centrifuge to obtain the dry product of the gulong acid, and then put the dry product of the gulong acid into a certain amount of methanol Carry out esterification conversion in the middle, and finally make Vc-Na or Vc. In the transformation method, gulonate crystals are prepared by going through a cation exchange step from a gulonate sodium solution. In this step, after the cation exchange resin is saturated, it needs to be backwashed with a large amount of tap water, then regenerated by adding 4% liquid caustic soda for 2 hours, then washed with tap water until the pH is 8, and regenerated by adding 7-...

Claims

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Application Information

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IPC IPC(8): C07D307/62
Inventor 陈星
Owner 陈星
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