Method for preparing salt-free 2-amino-1,5-naphthalenedisulfonic acid

A technology for salt sulfonating Tuburic acid and Tuburic acid, applied in chemical instruments and methods, preparation of sulfonic acid, preparation of organic compounds, etc., can solve the problems of general product quality, immature process, environmental pollution, etc., and achieve economical Significant benefits and social benefits, low labor intensity, and the effect of reducing pollution
CN101973914BInactive Publication Date: 2013-11-13山西翔宇化工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
山西翔宇化工有限公司
Publication Date
2013-11-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing salt-free 2-amino-1,5-naphthalenedisulfonic acid, which comprises the following steps: (1) performing a sulfonation reaction; (2) refining sulfonation solution; (3) performing acid eduction; (4) decreasing and maintaining temperature; (5) centrifuging; (6) refining acid filtrate; and (7) recovering sulphuric acid tail gas and SO3 gas. Based on the technical scheme of the invention, the method for preparing salt-free 2-amino-1,5-naphthalenedisulfonic acid is suitable for industrial production, requires low sulfonation reaction temperature and mild reaction conditions, causes fewer byproducts, realizes high conversion rate and high selectivity, lowers labor intensity, allows the acid filtrate and harmful gas to be recycled and relieves environment pollution.
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Description

technical field

[0001] The invention belongs to the field of preparation methods of chemical raw materials, and in particular relates to a method for preparing salt-free sulfonated torezic acid, which uses fuming sulfuric acid and torezic acid as raw materials, and adopts the operation process of circulating acid-containing filtrate, continuously Preparation of salt-free sulfonated turezic acid. Background technique

[0002] Salt-free sulfonated tunic acid can be used as an intermediate in the synthesis of reactive dyes, photosensitive materials and organic dyes. Reactive dyes, photosensitive materials and organic dyes are widely used in the textile industry, plate making industry, and dye industry, and the application fields are further expanding. Therefore, the demand for salt-free sulfonated turezic acid as an intermediate is also constantly increasing. Large, with broad market prospects and development space.

[0003] At present, most domestic manufacturers produce sal...

Claims

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