Pt-Cu-Zn/C催化加氢制备DSD酸工艺

Preparation of DSD Acid by Pt-Zn-Cu/C Catalytic Hydrogenation

本文研究了4,4＇-二硝基二苯乙烯-2,2＇-二磺酸（DNS酸）,在Pt/C催化剂存在下,Zn和Cu为抑制剂,水相体系中液相催化加氢制备DSD酸。Pt-Cu-Zn/C催化剂制备DSD酸具有很好的活性和选择性,能有效抑制苄基物及影响色度的杂质的生成。较佳的工艺条件为：DNS酸钠盐质量浓度为12~20%、Pt/C催化剂量为硝基物的0.5~0.7%,反应温度40~60℃、pH4~6、氢气压力1.0 MPa。DNS酸转化率100%,DSD酸选择性98.5%以上,收率98%,DSD酸含量均达到95%以上（氨基值法）,苄基物含量低于0.1%（外标法）,色度低于0.2。新工艺生产每吨DSD酸产生废水12吨,废水COD值为24 mg/L,无色透明。

DSD acid was prepared from DNS acid by liquid phase catalytic hydrogenation in the presence of Pt-Cu-Zn /C catalyst. The catalyst could effectively inhibit benzyl compound and the by-productions which affected the chrominance of DSD acid. The optimum conditions were： concentration of the DNS sodium salt 12%- 20%,the amount of catalyst 0. 5%- 0. 7%（ in DNS acid）,reaction temperature was 40℃- 60℃,pH4- 6,and hydrogen pressure 1. 0 MPa. Through the study on liquid phase catalytic hydrogenation,we found the content of benzyl compound was contrary to the chrominance. In this new process： the conversion of DNS acid was100%; the regioselectivity was 98. 5%; the yield was 98%; the concentration purity of product was more than 95%（ the value of amino-group was detected）. The benzyl compound was less than 0. 1%; the chrominance was less than 0. 2,and other targets were reached sector standard. The new process generated 11 ton wastewater per 1 ton DSD acid,the wastewater was colorless and transparent,and COD volue was 24 mg /L.