Methanol and light hydrocarbon coupling cracking device and method

Abstract

The invention discloses a methanol and light hydrocarbon coupling cracking device and method, and belongs to the technical field of petrochemical engineering. The device comprises a riser reactor anda fluidized bed reactor, a light hydrocarbon feed port and a catalyst inlet are arranged at one end of the riser reactor, the other end of the riser reactor is communicated with the fluidized bed reactor, and a methanol feed port is arranged at the end, communicated with the riser reactor, of the fluidized bed reactor. According to the device, a series reactor combining the riser and the fluidizedbed is used, so that the coupling of light hydrocarbon cracking reaction and methanol cracking reaction can be realized, the gas-solid contact time required by light hydrocarbon cracking is ensured,and the one-way yield of low-carbon olefin is improved. The device is adopted, light hydrocarbon and a first catalyst are contacted in the riser reactor and are subjected to cracking reaction, generated low-carbon olefin and the reacted first catalyst enter the fluidized bed reactor to contact methanol for reaction, and the two reactions share one catalyst and one reactor, so that the coupling ofenergy and reaction is realized, and the purpose of increasing the yield of low-carbon olefin is achieved.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a methanol and light hydrocarbon coupled cracking device and method. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important raw materials for the petrochemical industry. The production technologies of low-carbon olefins include steam cracking, catalytic cracking, propane dehydrogenation, methanol-to-olefins, olefins disproportionation and catalytic cracking of light hydrocarbons. At present, the production of light olefins mainly adopts steam cracking process, and its raw materials are usually straight run naphtha, hydrocracked naphtha, hydrogenated light wax oil and top oil from reforming unit. After decades of development, steam cracking has become a very mature technology, but there are still the following problems: high reaction energy consumption and low yield of low-carbon olefins. [0003] In view of this, the present inventi...

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Problems solved by technology

After decades of development, steam cracking has become a very mature technology, but there are still the following problems: high reaction energy consumption, low yield of low-carbon olefins

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