The amount of lignosulphonate in 6% of the 20 times the amount of ammonia, Pressure is 2.94~ 3.92MPa, Temperature of 180 ~ 250 ℃, Reaction time is 3 ~ 5 h, Air quantity is 5 ~ 10 L/min. In the first phase of carboxylic acid ammonium salt, low-level fatty acid amide and indole ring, pyrrole […]