Method for preparing benzene and co-producing ethylene from acetylene

Abstract

The invention discloses a method for preparing benzene and co-producing ethylene from acetylene. The method comprises the following steps: (1) mixing the acetylene, hydrogen, methane and steam to obtain feed gas; (2) supplying the feed gas to a reactor with a catalyst for reaction; (3) performing separation treatment on a material obtained by reaction in step (2) to obtain the benzene and the ethylene. According to the method, multiple reactions are coupled, so that the shortcomings of complexity in catalyst preparation, poor selectivity, harsh process conditions, high carbon deposition rate and requirements on use of a toxic solvent during alkyne aromatization reaction are overcome, the problem of high catalyst deactivation rate caused by heat transfer difficulty and high green oil production rate of a high-concentration acetylene hydrogenation process is solved, and the benzene and the ethylene can be prepared at the same time; moreover, the method has the advantages of simple process, easiness for temperature control and product selectivity adjustability, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of chemical industry. Specifically, the invention relates to a method for preparing benzene and co-producing ethylene from acetylene. Background technique [0002] Both benzene and ethylene are important petrochemical raw materials, and their downstream products are widely used in the fields of environment, energy, industry, and biology. However, ethylene is mainly produced by the cracking of petroleum hydrocarbons, and benzene is mainly extracted from petroleum products. my country is rich in coal, lacks oil and gas, and is highly dependent on foreign oil. This poses a serious strategic threat to our country, which is not rich in oil reserves. Therefore, seeking another new source and process to prepare bulk basic chemical raw materials—benzene and ethylene, and replacing petroleum as raw materials in the field of industrial production can largely alleviate my country's dependence on petroleum. [0003] W...

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose a kind of method that acetylene prepares benzene and co-produces ethylene, and this method solves the multiple problems that exist in the prior art by coupling multiple reactions, for example, avoids the alkyne aromatic The defects of complex catalyst preparation, poor selectivity, harsh process conditions, easy carbon deposition and the need to use toxic solvents in the structuring reaction; overcome the difficulties of heat removal in the high-concentration acetylene hydrogenation process, and the problems of easy production of green oil that cause catalyst deactivation, thus Benzene and ethylene can be prepared at the same time, and has the advantages of simple process, easy temperature control, and adjustable product selectivity, suitable for large-scale production

Images