关键词: 4,4′-二氨基二苯乙烯-2,2′-二磺酸（DSD酸）, 催化加氢, Pt/C, 催化剂套用, 4, 4′-二氨基二苯乙烯-2, 2′-二磺酸（DSD酸）, 催化加氢, Pt/C, 催化剂套用

Abstract: Preparation of 4,4'-diaminostilbene-2,2'-disulfonic acid (DSD acid) with the liquid-phase catalytic hydrogenation method using Pt/C as catalyst in water medium was studied. The optimum technical conditions determined by a series of experiments were as follows: 60 g (wet) of feed material DNS，200 mL of H2O，0.3 g (dry) of catalyst 3%Pt/C，reaction temperature of 45—50 ℃，reaction pressure of 0.5—0.65 MPa and pH value of 5—7 in the reaction system. Under these optimum technical conditions，purity of the product could exceed 99%，by-products of benzyl and aldehyde compounds were less than 0.15%. The yield of product came up to 98.5%. And，through a proprietary catalyst regeneration technology，the catalyst could be reused more than 20 times，reducing the cost greatly and providing the foundation for its commercialization.

Key words: 4,4’-diaminostilbene-2,2’-disulfonic acid(DSD acid), catalytic hydrogenation, Pt/C, reused of catalyst., 4,4'-diaminostilbene-2,2'-disulfonic acid (DSD acid), catalytic hydrogenation, Pt/C, reuse of catalyst