Study On The Synthesis Of Trichloroacetyl Chloride From Acetyl Chloride By Gas-Solid Catalytic Chlorination

Methytriacetaloxidesilane is widely used as an important coupling agent of the room temperature vulcanized single component silicon rubber. It is synthesized mainly from methyltrichlorosilane and acetic anhydride. However, the process produces a large volume of acetyl chloride which contains many other impurities such as methyltrichlorosilane, dimethyldichlorosilane and trimethylchlorosilane that are difficut to be seperated from the acetyl chloride. Therefore, the purity of acetyl chloride in the by-products is only about 90-95%. As a result, the usage of the Acetyl Chloride is very limited.The acetyl chloride is one kind of colorless,transparent and fuming liquid with irritant smell. Its boiling point, molecular formula and structural formula are respectively 52℃, C2H3ClO andBecause the acetyl chloride is easy to volatilize and has intense irritant smell. It will lead to resource waste and environment pollution if discharged without being processed.. With the increase of the market demand and the further enlargement of the production scale of Methytriacetaloxidesilane, the quantity of these coupled-products will increase as well. Therefore, how to reasonably utilize the 90-95% coupled-product acetyl chloride directly affects the production of Methytriacetaloxidesilane.There are two ways to utilize the 90-95% acetyl chloride: One is to separate the acetyl chloride from the impurities directly and to purify it to 99%. The other way is to transform the 90-95% acetyl chloride into other material with more extensive uses and than separate the impurities to obtain a new product.The emphasis of this research is to combine the present market situation and feasibility of forefathers' scheme, synthetically consider to find a more effective and simpler technical route that can also obtain big economic profits, and realize the most rational use of this coupled-product.A new way is studied and developed to utilize the coupled-product acetyl chloride and transform the acetyl chloride into another important organic intermediate, Trichloroacetyl chloride, by means of gas-solid catalysis and chlorination with the aid of active charcoal. The reactor type is determined and the operation conditions for preparation of trichloroacetyl chloride is optimized.In this process, the conversion rate and the yield reach above 99% and 95% respectively. In addition, this work tries to...