- Method for preparing amino-naphthol-sulfonic acid through catalytic hydrogenation
-
The invention discloses a method for preparing amino-naphthol-sulfonic acid through catalytic hydrogenation, belonging to the technical field of organic synthesis. The method is characterized by using Raney nickel, Pt/C or Pd/C as a catalyst and carrying out catalytic hydrogenation reaction at a temperature of 50-120 DEG C and a pressure of 0.5-4MPa for 0.5-5 hours, thus preparing amino-naphthol-sulfonic acid, wherein the amount of the added catalyst is 0.5-8% of the mass of added nitroso group or nitro-naphthol-sulfonic acid. The product has liquid chromatography content of more than 98% and yield of more than 90%. The method has the advantages that the process is simple and convenient to operate and avoids equipment corrosion; the product obtained after reaction is completed can be directly used in the next reaction, without after-treatment, and does not generate any solid or liquid waste, thus avoiding the problems of difficulty in solid waste treatment and pollution in sodium hyposulfite processes; the product obtained by applying the process has good quality; and the production process is environment-friendly and green.
- -
-
Paragraph 0025
(2016/11/17)
-
- Sulfochlorination of 1,2-Naphthoquinone-(2)-diazide by Chlorosulfonic acid
-
The sulfochlorination of 1,2-naphthoquinone diazide-(2) (1) by chlorosulfonic acid was investigated.The yields of the formed products (1,2-naphthoquinone diazide-(2)-4-sulfonic acid (4), 1,2-naphthoquinone diazide-(2)-5-sulfonic acid (5), 1,2-naphthoquinone diazide-(2)-4-sulfochloride (2) and 1,2-naphthoquinone diazide-(2)-5-sulfochloride (3)) depend on the temperature and on the time of reaction.The highest yields of the favoured 1,2-naphthoquinone diazide-(2)-4-sulfochloride (2) are obtained at 63 deg C and after a reaction time of 80 minutes (50percent).
- Sauer, E.,Polz, K.,Schopf, G.,Bendig, J.
-
p. 467 - 473
(2007/10/02)
-