Catalytic processing of the С₃-С₄ fraction to produce arenes

Process Description
Feedstock – С₃-С₄ hydrocarbons are mixed with recycle streams of unconverted raw material components and part of the methane from unit 4. The combined stream is heated in heat exchanger 3 and fed into reactor 1, into which heated methane is fed before each catalyst layer . The resulting catalyzate is cooled in heat exchanger 3 and separated in unit 4 to produce gaseous products, aromatic hydrocarbons and unconverted raw material components. Recycle methane stream is also removed from unit 4, which is partially mixed with raw materials, and partially sent to mix with natural gas. Combined stream is fed to heater 5, into which the regeneration gas is supplied. Heated methane is discharged from heater 5. Oxidative regeneration of the catalyst is carried out in reactor 2. The catalyst is purged with an oxygen-rich gas, and the resulting regeneration gas is removed from the unit or fed to the heater 5 for afterburning.

Process features

• High yield of aromatic hydrocarbons
• Using a mixture of methane (NG) with С₃-С₄ hydrocarbons as raw materials
• Possibility to process olefin-rich raw materials

Technical Specification

• Process temperature: 490–545 °С
• Pressure 0,35–0,45 MPa
• Benzene-toluene-xylene fraction withdrawal:up to 72% wt.

Patents of the Russian Federation No.
2565229, 2641692, 2653849, 2710935, 2719385, 2724583,
2726373, 2758350, 2758765, 2762507, 2762508

Development level, industrial application

• Basic projects for the production of benzene-toluene-xylene fractions with a capacity of 30 and 100 KTA have been developed