Catalyst traditional transesterification method is mainly used on inorganic acids, organic acids or acid salts thereof, the advantage of cheaper prices. But they have a strong corrosive methacrylate, equipment, equipment and operating conditions more stringent requirements. And the long reaction time, side effects and more serious waste supply of methyl methacrylate, easy to make product color darker. Such catalysts in the transesterification method is gradually being phased out. Non-acidic catalyst is the new direction of development in recent years. Its main feature is the corrosive effect of methyl methacrylate no use, good quality, light color, less side effects, relatively mild reaction conditions. For now, the organic tin titanate compound with an alkali metal alkoxide is an ideal catalyst for the transesterification method, as long as the recovery of heavy use problem solving sales methyl methacrylate, industrial production in the future will be widely used. [3] ammonia gas production process ⑴ raw coal and natural gas and other raw materials crude material containing hydrogen and nitrogen gas. For solid raw coal and coke gasification commonly used methods of synthesis gas; residual method can be obtained non-catalytic partial oxidation synthesis gas; gaseous hydrocarbons and naphtha, the use of two-stage steam reforming industry Preparation syngas. ⑵ purification of the crude feed gas purification, except for hydrogen and nitrogen impurities, including the transformation process, desulfurization and decarbonization process gas purification process. ① carbon monoxide conversion process in the production of synthetic ammonia, various methods are taken feed gas comprising CO, the volume fraction thereof is generally 12% to 40%. Ammonia required two components is H? N ?, and CO in the synthesis gas thus needs to be removed. Conversion reaction is as follows:??? CO + H O → H + CO ΔH = -41.2kJ / mol Cheung dry chemical (Figure), the supply of methyl methacrylate, methyl methacrylate, Liaoning Xiang dry by Jinan Chemical Co. . Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) adhere to the "people-oriented" business philosophy, has a professional staff, and strive to provide the best products and services to contribute to the community, and welcome to new and old customers to visit us and sincere cooperation for a better future. Xiang dry chemical - your trusted friend, Company Address: Industrial Road chemical market, Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_38808025.html), for more information about the company.