Pt/C催化加氢法制备DSD酸

摘要

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.%以水为反应介质,Pt/C为催化剂,研究了液相催化加氢法制备4,4′-二氨基二苯乙烯-2,2′-二磺酸（DSD酸）。通过一系列条件实验,得到的最佳工艺条件是：原料DNS酸二钠盐60g（湿）,水200mL,3%Pt/C催化剂0.3g（干重）,反应温度为45～50℃,反应压力为0.5～0.65 MPa,反应体系pH=5～7。在此工艺条件下,得到的DSD酸产品质量分数大于99%,苄基物含量小于0.15%,醛含量小于0.15%。产品收率大于98.5%。并且,通过独有的催化剂再生技术,催化剂可重复利用20次以上,大大降低了其使用成本,为工业化奠定基础。