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Method for producing DL-aspartic acid from waste radix asparagi

A technology of aspartic acid and waste asparagus, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as accumulation, unqualified products, and poor fluidity of products, and solve environmental problems and alleviate The effect of environmental pressure

Active Publication Date: 2014-12-31
宜兴市前成生物有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this scheme: the light transmittance of the produced materials is low due to the addition of waste asparagus in the production process, and even the products are unqualified
Due to the unknown impurities in the added waste asparagus, the particle size of asparagus in the extraction process is relatively small, and the fluidity of the product is poor
However, if the waste asparagus is discarded, it will accumulate over time and cause increasingly serious environmental problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Determination of optimal racemization temperature and time in the process of preparing DL-aspartic acid by low-temperature racemization of L-aspartic acid in waste asparagus

[0019] Take deionized water and heat it to 80°C, take an appropriate amount of industrial liquid caustic soda with a mass percentage of 40% and gradually add it, and at the same time, add asparagus waste and completely dissolve it to make a solution with a concentration of 25% (100ml solution contains 25g asparagus waste), The mass volume ratio g:ml of the waste asparagus and industrial liquid caustic soda is 100:50. Add an appropriate amount of ammonia water to adjust the pH of the solution to 7.5, and keep stirring during the adjustment of the pH. Add an appropriate amount of activated carbon for decolorization and suction filtration, transfer the filtrate to a high-temperature and high-pressure reactor and add salicylaldehyde (the volume ratio of salicylaldehyde and filtrate is 1ml: 1...

Embodiment 2

[0023] Example 2 Determination of the optimum reaction temperature and time for synthesizing DL-aspartic acid from residual fumaric acid in asparagine waste

[0024] Take deionized water and heat it to 80°C, take an appropriate amount of industrial liquid caustic soda with a mass percentage of 40% and gradually add it, and at the same time, add asparagus waste and completely dissolve it to make a solution with a concentration of 25% (100ml solution contains 25g asparagus waste), The mass volume ratio g:ml of the waste asparagus and industrial liquid caustic soda is 100:50. Add an appropriate amount of ammonia water to adjust the pH of the solution to 7.5, and keep stirring during the adjustment of the pH. Add an appropriate amount of activated carbon for decolorization and suction filtration, transfer the filtrate to a high-temperature and high-pressure reactor and add salicylaldehyde (the volume ratio of salicylaldehyde and filtrate is 1ml: 1000ml). For the first heating, ra...

Embodiment 3

[0031] After heating deionized water to 85°C, take an appropriate amount of industrial liquid alkali with a mass percentage of 35% and gradually add it. At the same time, add asparagus waste and completely dissolve it to make a solution with a concentration of 30% (100ml solution contains 30g asparagus waste) , the mass-to-volume ratio g:ml of the waste asparagus and industrial liquid caustic soda is 100:60. Add an appropriate amount of ammonia water to adjust the pH of the solution to 7.5, and keep stirring during the adjustment of the pH. Add an appropriate amount of activated carbon for decolorization and suction filtration, transfer the filtrate to a high-temperature and high-pressure reactor and add salicylaldehyde (the volume ratio of salicylaldehyde and filtrate is 2ml: 1000ml). Raise the temperature to 120°C and maintain it for 4 hours, then raise the temperature to 150°C and maintain it for 8 hours; after cooling, release the feed liquid and undergo decolorization, ad...

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Abstract

The invention discloses a method for producing DL-aspartic acid from waste radix asparagi, which comprises the following steps: heating deionized water, and adding liquid alkali and waste radix asparagi to completely dissolve the waste radix asparagi, thereby obtaining a solution of which the waste radix asparagi concentration is 20-30%; adding ammonia water to regulate the pH value, decolorizing, carrying out vacuum filtration, transferring the filtrate into a reaction kettle, adding a catalytic amount of catalyst, heating to 110-125 DEG C, keeping for 3-5 hours, heating to 130-160 DEG C, and keeping for 7-12 hours; cooling, discharging the liquid, decolorizing, and carrying out isoelectric point extraction to obtain the DL-aspartic acid crude product; and refining the crude product to obtain the finished product. At present, the waste radix asparagi is received by no man, and accumulated over a long period, so that the environmental protection problem becomes increasingly serious. The method disclosed by the invention solves the problem of abundant waste radix asparagi generated in the existing production process, and relieves the environmental protection pressure caused by solid waste of the enterprises. The invention changes wastes into valuable substances, solves the environmental protection problem, and can bring about economic benefit to the enterprises.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to the reuse of waste asparagus produced in the production of L-aspartic acid. It specifically relates to a process for producing DL-aspartic acid from waste asparagine. Background technique [0002] Process plan 1 for the preparation and extraction of L-aspartic acid in the prior art: fumaric acid and ammonia react to form ammonium fumarate, and then transform the fermentation broth to produce L-aspartic acid. After the transformation, activated carbon is added to the transformation solution for decolorization and pressure filtration, followed by direct sulfuric acid isoelectric extraction of L-aspartic acid, soluble impurity ions are washed with deionized water, and the washing solution and isoelectric mother liquor are combined into a sedimentation tank. The environmental protection workshop extracts the mixed liquid from the settling tank and concentrates it until some solids are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C229/24C07C227/36C07C227/06C07C227/40
Inventor 席日新李海涛
Owner 宜兴市前成生物有限公司