聚乙烯（polyethylene）.docVIP

聚乙烯（polyethylene） It is now combined with the method of body, gas and ontology. 1 slurry process Slurry process (Slurry Process), also known as slurry or solvent process, is the worlds earliest technology for the production of polypropylene. From the first industrialized plant in 1957 to the middle and late 1980s, the slurry process has been the most important polypropylene production process for 30 years. Typical processes include Italys Montedison process, the United States Hercules process, Japan Mitsui East pressure chemical process, the United States Amoco process, Mitsui Mitsui oil refining process, and process. These processes were developed on the basis of the first generation of catalysts, using a vertical stirred tank reactor requiring removal of ash and removal of random solids. The process and operating conditions vary with the solvent used. In recent years, the proportion of traditional slurry process in the production of the product significantly reduced, slurry is mainly used for some high value retention areas, such as special BOPP film, high molecular weight and high strength pipe blown film. In recent years, people have improved the method of slurry production process improvement after the use of the second generation of high activity catalyst, catalyst can remove the ash removal steps can reduce random polymer production, can be used in the production of homopolymer, copolymer and impact copolymer products etc.. At present, the production capacity of PP in the world slurry process accounts for about 13% of the total PP production capacity of the world. 2 body process The research and development of the bulk process began in 1960s. In 1964, the United States Dart company built the first set of industrialized polypropylene production equipment in the world using a kettle reactor. After 1970, Sumitomo, Phillips, USA EI, Psao and other companies realized the industrialization of liquid phase polypropylene process. Compared with the method using slurry