Preparation method of 4,4`-diaminobibenzyl-2,2`-disulfonic acid

A disulfonic acid and diamino technology, which is applied in the direction of sulfonic acid preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of many side reactions, high reaction temperature, and aggravation, so as to improve chemical selectivity, The effect of reducing production cost and reducing dosage
CN110143897BInactive Publication Date: 2020-03-31ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2020-03-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of 4,4'-diaminodiphenyl-2,2'-disulfonic acid. The preparation method comprises the following steps: mixing a DNS, a iron-nickel composite carrier-type catalyst and a solvent in a reactor; then dropwise adding hydrazine hydrate for carrying out a reaction, wherein the solvent is ethylene glycol or diethylene glycol; and after the reaction is finished, carrying out cooling to room temperature, carrying out filtering, adjusting the pH value of the filtrate to 2-3, and drying the separated solid to obtain the 4,4'-diaminodiphenyl-2,2'-disulfonic acid. According to the method, the reaction can be carried out under normal pressure, a precious metal catalyst is not needed, production cost is low, and the yield is high.
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Description

technical field

[0001] The invention belongs to the field of organic synthesis, and in particular relates to a preparation method of 4,4'-diaminobibenzyl-2,2'-disulfonic acid. Background technique

[0002] 4,4'-diaminobibenzyl-2,2'-disulfonic acid, referred to as DADB, its molecular formula is C 14 h 16 N 2 o 6 S 2 , with a molecular weight of 372 and a structural formula as shown in formula 1, is an important chemical intermediate and has important applications in the dye industry.

[0003]

[0004] Judging from the domestic and foreign literature reported so far, the main preparation method of DADB is to use 4,4'-dinitrostilbene 2,2'-disulfonic acid (DNS) as raw material, and then reduce to obtain the product, according to the reducing agent The differences are mainly divided into the following categories:

[0005] Literature (Shiyou Huagong, 32(11), 941-943; 2003) reported a method for preparing DADB using DNS and hydrogen as raw materials, water as a solvent, an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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