Production method for maximizing ethylene or propylene

Abstract

The invention discloses a production method for maximizing ethylene or propylene. The method comprises the following main steps of: crude oil and distillate oil thereof, urban mixed waste plastics andthe like are used as raw materials, the raw materials are pretreated and then enter a catalytic cracking reactor, and high-temperature oil gas after reaction is cooled by a two-stage pre-washing tower to remove impurities and is subjected to related separation to obtain light distillate oil and heavy distillate oil; hydrogenation reaction operation is carried out on the heavy distillate oil; light distillate oil separation treatment: olefin is subjected to recombination operation, alkane enters a steam cracking device to produce ethylene in a rich manner, and aromatic hydrocarbon components are separated to serve as byproducts; and a product of the hydrogenation and recombination reaction and distillate oil of steam cracking are circulated to the catalytic cracking reactor. According to the production method disclosed by the invention, the yield of ethylene and propylene is 45-75m% of that of the raw material, and the yield of aromatic hydrocarbon is 15-30m% of that of the raw material; particularly, when the urban mixed waste plastic is used as a raw material, ethylene or propylene is produced by the urban mixed waste plastic, new plastic is reproduced by a conventional polymerization process, and the chemical cyclic utilization of the waste plastic is realized.

Description

technical field [0001] The invention belongs to the technical field of ethylene or propylene production, and in particular relates to a production method for maximizing ethylene or propylene. At the same time, the invention also belongs to the technical field of solid waste treatment and utilization, and specifically relates to a method for chemical recovery of waste plastics in domestic garbage and industrial garbage. Background technique [0002] Steam cracking to produce ethylene, its traditional raw material has always been limited to naphtha, due to the limited resources of naphtha, and part of the naphtha will be sent to the reforming unit to produce aromatics, so the limited raw material has always restricted the production capacity of ethylene; how to expand in large quantities Steam cracking feedstock is one of the keys to solve the ethylene production. [0003] Plastics are widely used in various industries, such as textile industry, home appliance industry, const...

AI Technical Summary

Problems solved by technology

[0004] Compared with metal recycling, the biggest problem of plastic recycling is that it is difficult to use machines for automatic sorting, and the process involves a lot of manpower

The repeated recycling rate of plastics is generally low, forming a huge waste of resources, and the waste generated by the use of a large number of plastic products will cause serious environmental pollution problems if they are disposed of by landfills, incineration, etc.

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