Production of tert-butylamine from isobutylene

This post was last edited by Look up on 2019-6-15 at 15:45. The market for tert-butylamine is not very large; there are mainly 4 production methods: 1. Hydrolysis of tert-butyl urea – In this method, urea is reacted with tert-butanol at low temperatures in the presence of sulfuric acid to produce tert-butyl urea sulfate. The sulfuric acid is then neutralized with an alkali to obtain tert-butyl urea, which is subsequently hydrolyzed to yield tert-butylamine. This is the traditional method for producing tert-butylamine, and the reaction process involves a large amount of strong acids and strong bases. The equipment is severely corroded, resulting in low product yields, poor quality, high costs, and difficulties in scaling up production. In China, production is mainly carried out by companies such as Shandong Sanyi Fine Chemicals Factory, Shandong Huantai Social Welfare Rubber Additives Factory, and Shandong Yanggu Huatai Additives Factory; this method has been phased out abroad. 2. The isobutylene amination method has low production costs and minimal pollution; however, its drawback is the high technical complexity of the process, as the reaction takes place under high temperature and pressure, which requires sophisticated equipment. Industrial production of this method has not been carried out in China, while companies such as BASF in Germany, Texaco in the United States, and AkzoNobel have achieved large-scale production. Domestic Yuhuang Chemical possesses this technical process package, which is available for external transfer. 3. The isobutylene-cyanide method is relatively simple, yields high-quality products with high yields. However, it requires equipment with high corrosion resistance; moreover, the cyanide raw materials cause significant environmental pollution and increase production costs. As a result, it has little industrial significance in China. Representative manufacturers abroad include Bayer in Germany, Rohm and Haas in the United States, and Sumitomo Chemical in Japan. 4-Methyltert-butyl ether-hydrogen cyanide method: This method yields products of high quality, and its production process causes no environmental pollution. In particular, China’s acrylonitrile industry has developed rapidly in recent years; however, hydrogen cyanide, being highly toxic, presents difficulties in terms of sales, storage, and transportation. Zibo Fufeng Tonghui Chemical Co., Ltd. in China took advantage of the available hydrogen cyanide resources, establishing its factory near the acrylonitrile plant operated by Qilu Petrochemical. By utilizing the hydrogen cyanide byproduct from that plant, the company was able to produce tert-butylamine on a large scale. Through continuous improvements, the company has now developed a unique manufacturing process, though the quality of its products is slightly inferior to that obtained using the direct ammoniaation of isobutylene. Some manufacturers of the accelerator NS still specify the purchase of products produced by the direct amination of imported isobutylene. The more promising method is the direct amination of isobutylene; in China, only BASF has an industrial plant with a capacity of 15,000 tons.