Process for producing olefin from methanol and for co-producing gasoline and aromatic hydrocarbon

Abstract

The invention provides a process for producing olefin from methanol and for co-producing gasoline and aromatic hydrocarbon. The process comprises the following steps: (1) introducing a methanol solution into an MTO fixed bed reactor, facilitating a reaction in the existence of an MTO catalyst, cooling a reaction product, separating the product in a separation tower to obtain a gas phase containing low-carbon olefin and a liquid phase containing the aromatic hydrocarbon; (2) separating ethylene, propylene, butylenes and methane from the gas phase in the step (1), introducing the residual gas into a light-hydrocarbon aromatization reactor, facilitating a reaction in the existence of an aromatization catalyst to obtain an aromatization reaction product, mixing the aromatization reaction product and the reaction product in the step (1), and separating a mixture in the separation tower of the step (1). According to the process, the low-additional-value byproduct formed after the MTO reaction is sufficiently utilized and is converted into the gasoline and aromatic hydrocarbon by virtue of the light-hydrocarbon aromatization reaction, so that the zero emission of the byproduct is realized, the yield of liquid hydrocarbon is increased, and the economic benefit of an enterprise is increased.

Description

technical field [0001] The invention relates to the field of methanol conversion technology, in particular to a technology for producing olefins from methanol and co-producing gasoline and aromatics. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic chemical raw materials. With the development of my country's national economy, especially the development of modern chemical industry, the demand for low-carbon olefins is increasing day by day. The MTO process of methanol to low-carbon olefins has become increasingly important chemical technology. The MTO process refers to the chemical process technology that uses coal-based or natural gas-based synthetic methanol as a raw material to produce low-carbon olefins with the help of a fluidized bed reaction similar to a catalytic cracking unit. Its main products are ethylene, propylene, etc. Resources to produce core technologies for ethylene, propylene and other products. [0003] W...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that low-value-added by-products cannot be fully utilized in the production of low-carbon olefins from coal-based methanol in the prior art, thereby providing a process for co-producing gasoline and aromatics from methanol to olefins

Images