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Preparation method for 5-amino-2,4-dihydroxybenzoic acid

A technology of dihydroxybenzoic acid and amino, which is applied in the preparation of nitro compounds, organic compounds, cyanide reaction, etc., can solve the problems of fire and explosion, unfavorable safety production, etc., achieve fast response, improve production efficiency, reduce The effect of production costs

Pending Publication Date: 2019-04-12
上海博栋化学科技有限公司
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Problems solved by technology

Diazonium salt is used in this process. Due to the instability of diazonium salt, there is a potential production hazard, which may cause accidents such as fire and explosion, which is not conducive to safe production.

Method used

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  • Preparation method for 5-amino-2,4-dihydroxybenzoic acid
  • Preparation method for 5-amino-2,4-dihydroxybenzoic acid
  • Preparation method for 5-amino-2,4-dihydroxybenzoic acid

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Experimental program
Comparison scheme
Effect test

Embodiment

[0035] (1) Preparation of intermediates

[0036] a) The reaction equation is as follows:

[0037]

[0038] b) The material ratio is shown in Table 1 below:

[0039] Table 1

[0040]

[0041] c) Specific operation:

[0042] Add 8.166kg of glacial acetic acid and 10.18kg of nitric acid into a 20L four-neck flask in turn, mechanically stir and mix evenly, lower the internal temperature of the mixed solution to 5-10°C, and add 2,4-dihydroxybenzoic acid 2000g in three times on average, the first time Remove the ice bath after adding material (one-third), the reaction system is exothermic violently, the temperature of the ice bath is controlled below 90°C, when the reaction system is no longer exothermic, cool down to 5-10°C and add one-third of the 2 , 4-dihydroxybenzoic acid, repeat the above operation until all the raw materials are added, and stir the reaction at 20-30°C overnight (in the control 1).

[0043] After the reaction was completed, the reaction liquid was po...

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Abstract

The invention provides a preparation method for 5-amino-2,4-dihydroxybenzoic acid. The method comprises the steps that the raw material 2,4-dihydroxybenzoic acid is provided; the 2,4-dihydroxybenzoicacid is subjected to a nitration reaction to generate 5-nitro-2,4-dihydroxybenzoic acid; the 5-nitro-2,4-dihydroxybenzoic acid is reduced by sodium hydrosulfite to the 5-amino-2,4-dihydroxybenzoic acid. By means of the method, the production cost can be reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a preparation method of 5-amino-2,4-dihydroxybenzoic acid. Background technique [0002] Poly-p-phenylenebenzobisoxazole (PBO) fibers are widely used in military, aerospace, weapons, civil and other fields. PBO has excellent breaking strength, modulus, elongation at break and other properties, making it in Reinforcing materials are widely used; at the same time, they are widely used as heat-resistant and flame-resistant materials due to their high cracking temperature; they are widely used in the aerospace field due to their excellent physical properties, heat-resistant and flame-resistant properties, and light weight. The performance and price of PBO fiber are in a leading position, so its research and development value is very high. [0003] In order to improve the composite bonding performance of materials and expand the application of PBO fibers in the field of composite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/04C07C229/64
CPCC07C201/08C07C227/04C07C229/64C07C205/59
Inventor 傅志伟贺宝元潘新刚余文卿陆伟谷春燕蒋小惠
Owner 上海博栋化学科技有限公司
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