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Production method for oxalic acid

A technology of oxalic acid and mixed acid, applied in separation methods, chemical instruments and methods, separation/purification of carboxylic acid compounds, etc., can solve the problems of large consumption of raw materials, long production time, low yield, etc., and achieve short production time, Contains the effect of low NOx content and high yield

Inactive Publication Date: 2016-02-03
王晓伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of large raw material consumption, long production time, low yield and a large amount of NO in the existing method for producing industrial oxalic acid by carbohydrate oxidation. x Serious technical problems of pollution, providing a method for producing oxalic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for producing oxalic acid, the preparation steps of which are:

[0018] ①To prepare hot mother liquor, first add 59% by weight of sulfuric acid, 42% by weight of oxalic acid, 4% by weight of nitric acid and 10% by weight of water into the container and mix evenly, then add it to the mother liquor concentration equipment for heating to 55°C;

[0019] ② Dissolving sugar Add glucose and the hot mother liquor prepared in step ① into the hydrolysis tank according to the weight ratio of 6:13 and stir for 5 hours;

[0020] 3. the concentrated nitric acid of 98% is added in the dilute nitric acid of 42% to the dilute nitric acid that the concentration of preparation standard acid is absorbed in water absorption tower, and the concentration of regulating dilute nitric acid is 55%;

[0021] 4. Prepare mixed acid Add the mixed acid mixed acid absorbed by the mother liquor absorption tower into the mixed acid preparation tank, then add the sulfuric acid with a concentrati...

Embodiment 2

[0028] A method for producing oxalic acid, the preparation steps of which are:

[0029] ①To prepare hot mother liquor, first add 59% by weight of sulfuric acid, 42% by weight of oxalic acid, 4% by weight of nitric acid and 10% by weight of water into the container and mix evenly, then add it to the mother liquor concentration equipment for heating to 55°C;

[0030] ② Dissolving sugar Add glucose and the hot mother liquor prepared in step ① into the hydrolysis tank according to the weight ratio of 6:13 and stir for 5-8 hours;

[0031] 3. it is 98% concentrated nitric acid to add the concentrated nitric acid that concentration is 98% in the dilute nitric acid that the concentration that the preparation standard acid absorbs to water absorption tower absorbs, regulates the concentration of dilute nitric acid to be 62%;

[0032] 4. Prepare mixed acid Add the mixed acid mixed acid absorbed by the mother liquor absorption tower into the mixed acid preparation tank, then add the sul...

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PUM

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Abstract

The invention specifically relates to a production method for oxalic acid, which belongs to the technical field of industrial oxalic acid production. The method comprises the following steps: preparation of hot mother liquor; dissolving of glucose; preparation of standard acid; preparation of mixed acid; jet oxidation; crystallization; filtering and drying; absorption of tail gas; and condensation of the mother liquor and washing liquor. Thus, the production method overcomes the technical problems of great consumption of raw materials, long production time, low yield and severe pollution caused by considerable NOx in tail gas in conventional carbohydrate oxidation processes for production of industrial oxalic acid. Compared with the prior art, the production method provided by the invention has the advantages of low consumption of raw materials, short production time, high yield and low content of NOx in the tail gas.

Description

technical field [0001] The invention belongs to the technical field of industrial oxalic acid production, and in particular relates to a method for producing oxalic acid. Background technique [0002] Oxalic acid, or oxalic acid, is one of the simplest organic dibasic acids. Oxalic acid plays an important role in industry and is widely used in industries such as medicine, metallurgy, construction and plastics. The methods for industrial production of oxalic acid mainly include: sodium formate method, carbohydrate oxidation method, oxo synthesis method, ethylene glycol oxidation method, propylene oxidation method and carbon monoxide coupling method. The characteristics of mild conditions and low cost play an important role in the production of industrial oxalic acid. The existing method of producing industrial oxalic acid by oxidation of carbohydrates has the disadvantages of large consumption of raw materials, long production time, low yield and a large amount of NO in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/06C07C51/305C07C51/27C07C51/42B01D53/78B01D53/75B01D53/56
CPCC07C51/305B01D53/56B01D53/75B01D53/78B01D2257/404B01D2258/0225C07C51/27C07C51/42
Inventor 王晓伟
Owner 王晓伟