Method for preparing aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in fixed bed reactor

Abstract

The invention relates to a method for preparing an aromatic hydrocarbon mixture rich in benzene, toluene and xylene (BTX) by conversion of methanol in a fixed bed reactor. The method comprises the following steps of feeding a catalyst for preparation of low-carbon olefin by conversion of methanol and a catalyst for aromatization of low-carbon olefin in the same fixed bed reactor to form a catalyst combined unit in which the lower layer is the catalyst for aromatization of low-carbon olefin and the upper layer is catalyst for preparation of low-carbon olefin by conversion of methanol; dividing methanol steam into a plurality of blasts, mixing one blast of the methanol steam, circulating LPG and water steam to obtain a mixture, feeding the mixture into the fixed bed reactor from a material inlet formed in the top of the fixed bed reactor, feeding the residual methanol steam into the fixed bed reactor from a material inlet formed in the side wall of the reactor to obtain the aromatic hydrocarbon mixture rich in BTX. The method has the advantages that the process is simple, the cost is low and the large-scale production can be achieved.

Description

technical field

[0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method for preparing an aromatic hydrocarbon mixture rich in benzene, toluene and xylene by converting methanol in a fixed-bed reactor. Background technique

[0002] Aromatics refer to a class of compounds containing benzene rings in their molecular structure. There are many types of such compounds, but the aromatics used on a large scale in industry refer to the so-called "triphenyls" including benzene, toluene and xylene, that is, BTX. So far, aromatics are mainly obtained from the reforming of naphtha in the petroleum processing process, and only a small amount of BTX products in the coal chemical industry come from the processing of crude benzene products in the coking process.

[0003] Methanol can be obtained from coal conversion on a large scale and is an important cornerstone of the coal chemical industry. So far, a number of technologies for...

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