在维生素B_2(Ⅱ)生产中的最后工序是由3,4-二甲基-D-核糖胺(Ⅲ)制取3,4-二甲基-6-苯偶氮-D-核糖胺(Ⅱ),并使其缩合成Ⅰ。 1.Ⅱ的合成:在苯胺重氮化操作中,根据电位差的改变来控制苯胺重氮反应过程。测定系统为铂和氯化银电极,并采用碘-淀粉试纸,当电势达到700～720mV时反应结束。另外,提高温度,在15～20℃下进行重 The final step in the production of vitamin B 2 (Ⅱ) is the preparation of 3,4-dimethyl-6-phenylazo-D-ribosamine from 3,4-dimethyl-D-ribosamine ), And make it condensed into Ⅰ. 1. Ⅱ synthesis: In the aniline diazotization operation, according to changes in potential difference to control the aniline diazo reaction. The measurement system was platinum and silver chloride electrodes and iodine-starch test strips were used. The reaction was completed when the potential reached 700-720 mV. In addition, the temperature is increased and the weight is carried out at 15 to 20 ° C