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Title:
PROCESS FOR SYNTHESIZING 2,4-DIAMINO BENZENE SULFONIC ACID AND SALTS THEREOF
Document Type and Number:
WIPO Patent Application WO/2008/011830
Kind Code:
A1
Abstract:
A process for synthesizing 2, 4-diamino benzene sulfonic acid, which comprises the following step: reacting m-phenylenediamine and sulfuric acid or oleum in a solvent at the temperature of 140-250°C to obtain 2,4-diamino benzene sulfonic acid, said solvent being one or more solvents selected from inorganic solvent phosphoric acid or polyphosphoric acid and organic solvent having a boiling point above 140°C under the normal pressure. A preparation process of 2,4-diamino benzene sulfonate, which comprises the following steps: obtaining 2, 4-diamino benzene sulfonic acid by the above-mentioned process, then conducting the salt forming reaction to obtain 2, 4-diamino benzene sulfonate. The present invention can effectively resolve the environmental problem caused by large amount of sulfuric acid and high cost problem, together with high yield and quality.

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Inventors:
TANG, Huilin (8th Floor, 88 Building No. 1199 North Qinzhou Rd, Shanghai 3, 200233, CN)
唐会林 (中国上海市钦州北路1199号88幢8楼, Shanghai 3, 200233, CN)
Application Number:
CN2007/070308
Publication Date:
January 31, 2008
Filing Date:
July 17, 2007
Export Citation:
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Assignee:
SHANGHAI WORLD-PROSPECT INTERNATIONAL TRADE CO., LTD. (8th Floor, 88 Building No. 1199 North Qinzhou Rd, Shanghai 3, 200233, CN)
上海世景国际贸易有限公司 (中国上海市钦州北路1199号88幢8楼, Shanghai 3, 200233, CN)
SHANGHAI WORLD-PROSPECT INDUSTRIAL CO., LTD. (8th Floor, 88 Building No. 1199 North Qinzhou Rd, Shanghai 3, 200233, CN)
上海世展实业有限公司 (中国上海市钦州北路1199号88幢8楼, Shanghai 3, 200233, CN)
International Classes:
C07C303/06; C07C309/46; C07C303/00; C07C309/00
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (435 Guiping Road, Xuhui, Shanghai 3, 200233, CN)
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