Method for preparing dimethylbenzene

A xylene and toluene technology, applied in the field of xylene preparation, can solve problems such as waste and increased separation costs
CN101723792AActive Publication Date: 2010-06-09MICROVAST POWER SYST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MICROVAST POWER SYST CO LTD
Publication Date
2010-06-09

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Abstract

The invention discloses a method for preparing dimethylbenzene, comprising on modified HZSM-5 molecular-sieve-based catalyst, adopting methyl bromide as methylation reagent, leading the methyl bromide to react with methylbenzene, and generating the target product dimethylbenzene and byproduct hydrogen bromide. The method has the advantages of comparatively low reaction temperature, higher conversion rate of reactant, less by product, long service life of the catalyst, high efficiency and low cost.
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Description

technical field

[0001] The present invention relates to a method for preparing xylene from toluene. Background technique

[0002] Xylene, also known as mixed xylene, is a mixture of p-xylene, o-xylene, m-xylene and ethylbenzene. The mixture is mainly used as a solvent for paint coatings and as an additive for aviation gasoline. When used as a chemical raw material, each isomer can be separated in advance. Among them, p-xylene is an important chemical raw material, the most important application (accounting for more than 80%) is used to produce PTA (terephthalic acid) and DMT (dimethyl terephthalate), and these two substances are It is mainly used in the synthesis of PET (polyester); p-xylene is also a commonly used organic solvent and can also be used in the synthesis of pharmaceutical intermediates.

[0003] The common method for industrial production of xylene is toluene selective disproportionation catalytic technology. Exxon Mobil proposed the MSTDP and MTPX toluene ...

Claims

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