Method for synthesizing dyestuff intermediate H acid by naphthalene
A technology for synthesizing dyes and intermediates, applied in 1 field, can solve problems such as difficult treatment of high-salt COD wastewater, and achieve the effects of reducing secondary pollution, reducing emissions, and reducing reaction time
Active Publication Date: 2010-06-02
泰兴锦汇化工有限公司
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The invention discloses a method for synthesizing dyestuff intermediate H acid by using naphthalene. In the method, the H acid is prepared by carrying out the steps of sulfonating with sulfonating agent sulfuric acid, nitrating with concentrated nitric acid, separating and neutralizing, reducing by catalytic hydrogenation, acid hydrolysis, and segregating on refined naphthalene. The H acid prepared by the method is suitable for various dyestuffs of active azo and the like, and can also be used for synthesizing medicaments. The synthesis method has the advantages of no tri-sulfonation, little waste acid amount, no alkali solution, less generated sulfur dioxide gas and inorganic salt, high yield, and reduced COD and secondary pollution of waste slag because of no iron cement generated by hydrogenation reduction.
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