Pd/C催化加氢法制备DSD酸

Preparation of 4,4′-Diaminostilbene-2,2′-disulfonic Acid by Pd/C Catalytic Hydrogenation

用水作反应介质,Pd/C为催化剂,研究了液相催化加氢法还原4,4′ 二硝基二苯乙烯 2,2′ 二磺酸(DNS)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,确定的最佳工艺条件是:原料DNS10g,质量浓度为180g/L;Pd/C催化剂0 8g;助催化剂OVN80mg;反应体系pH=6;反应温度65℃;压力0 8MPa。在此工艺条件下,制得产品的质量分数大于99%,产品收率可达95%。

Preparation of 4,4′diaminostilbene2,2disulfonic acid (DSD acid) via reduction of 4,4′dinitrostilbene2,2′disulfonic acid (DNS) with liquidphase catalytic hydrogenation method using palladiumcarbon as catalyst in water medium is studied.The optimum technical conditions determined by a series of experiments are as follows:10 g of feed material DNS with a concentration of 180 g/L,08 g of catalyst palladiumcarbon,80 mg of assistant catalyst OVN,pH value of 6 in reaction system,reaction temperature of 65 ℃ and pressure of 08 MPa.Under these optimum technical conditions,purity of the product can exceed 99% and the yield can come up to 95%.