天津一化化工有限公司开发出橡胶防老剂4020合成新工艺。将催化剂通入氢气加热预处理;将对氨基二苯胺和甲基异丁基酮按摩尔比1:2.5~4.5加入反应釜,加入质量百分比20%~25%预处理催化剂,通入氢气1.0~4.0MPa,反应温度100~130℃,反应时间3~6h,得到加氢反应液;将所得加氢反应液过滤,催化剂回收套用,蒸除容积得到残余物倾出,放置,得到防老剂4020固体。该方法以Pt/C进行催化加氢反应,高收率、高纯度的得 Tianjin Chemical Co., Ltd. developed a rubber antioxidant 4020 synthetic new technology. The catalyst is heated to preheat the hydrogen; the p-aminodiphenylamine and the methyl isobutyl ketone are added to the reaction kettle at a molar ratio of 1: 2.5-4.5, the catalyst is pretreated with the mass percentage of 20% -25% 4.0MPa, the reaction temperature is 100 ~ 130 ℃, the reaction time is 3 ~ 6h, to obtain a hydrogenation reaction solution; the resulting hydrogenation reaction solution was filtered, the catalyst recovered and applied, the volume was evaporated to give the residue was poured and placed to obtain antioxidant 4020 solid . The method uses Pt / C for catalytic hydrogenation, high yield and high purity