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Disadvantages of the Preparation Method of Amino Silanes

At present, domestic companies produce amino silanes still using ammonia hydrolysis. This method is characterized by an aminolysis reaction with chloropropyltriethoxysilane. There are many unavoidable disadvantages to this approach. First, in the synthesis process, due to poor selectivity, more by-products such as secondary amines and tertiary amines are produced, thereby reducing the yield and increasing the manufacturing cost. Second, in the production process, there will be ammonia emissions and the release of dangerous waste such as ammonium chloride as a by-product. This does not meet the basic principles of green chemistry and has a huge adverse impact on the ecological environment. Third, due to the high reaction pressure, the equipment is strictly required, which not only increases the production cost, but also has a large safety hazard in the production process. In this context, the research and development of industrial processes and industrialization of amino silanes are particularly important, and are an important direction for the industrialization of silanes. The amino silane produced by the new process not only has the advantages of high purity, but also has a green process and low cost. At the same time, in the synthesis of the target product, more high value-added products are co-produced. The utilization of atoms is high and the economic value is significant.

In the preparation method of the existing amino silanes, the conversion ratio of the amino silane is 97.4% and the selectivity of the primary amine is 95.8%. Although the conversion rate and the selectivity of primary amines in the existing methods are already high, as the state pays more and more attention to environmental protection issues in the chemical industry, the treatment of ammonia nitrogen compounds is becoming more stringent. Secondary amines, tertiary amines, and ammonium chloride by-products produced by the old process require significant processing costs. This increases production costs. Moreover, the concentration of chloride and amine ions in the amino silane product produced by the old method is too high. This still does not meet the needs of industry.