DNS加氢还原制备DSD酸

在水相中,以磷酸氢二钠和磷酸二氢钾为缓冲剂和Raney Ni为催化剂,研究液相催化加氢还原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)。试验结果表明,适宜的工艺条件为:原料质量浓度150~175 g/L、催化剂为原料质量的4%、温度为45~50℃和压力为0.8 MPa。在此工艺条件下的产品纯度为98.4%。

Reduction of DNS to DSD Acid by Hydrogenation

4, 4＇-diaminostilbene-2, 2＇ -disulfonic acid （DSD acid） was prepared via reduction of 4, 4＇- dinitrostiibene-2, 2＇-disulfonic acid （DNS） with liquid-phase catalytic hydrogenation method using Raney nickel as catalyst in water medium. The optimum technical conditions determined by a series of experiments were as follows：the concentration of DNS is 150--175 g/L, the amount of the catalyst used preferably 4% by weight based on DNS, temperature is 45--50℃, hydrogen pressure is 0.8 MPa. Under these optimum technical conditions, the purity of the product comes up to 98.4%.