Method for separating and purifying trimethyl benzene from C9 heavy aromatics

A technology for separation and purification of trimethylbenzene, applied in the field of aromatic hydrocarbon separation, can solve problems such as low yield, and achieve the effect of high yield and good purity
CN112457150AInactive Publication Date: 2021-03-09连云港鹏辰特种新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
连云港鹏辰特种新材料有限公司
Publication Date
2021-03-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for separating and purifying trimethyl benzene from C9 heavy aromatics. The method comprises the following steps: carrying out alkylation reaction on C9 heavy aromatics by using methanol as an alkylation reagent in a nitrogen atmosphere under the action of an alkylation catalyst; wherein the alkylation catalyst is a niobium oxide material loaded by a graphene / porous magnesium / aluminum metal oxide composite nano sheet; placing the alkylated solvent in a rectifying tower for reduced pressure distillation, collecting the (90-150) DEG C / 750mmHg fraction, and performing de-alkylation reaction on the collected fraction in a tubular furnace reactor in the presence of water vapor; putting the de-alkylated solvent into a cryogenic crystallizer, carrying out multi-stage cryogenic crystallization treatment, and then carrying out centrifugal treatment to obtain the trimethyl benzene crystal. The trimethyl benzene obtained by the method not only has high yield, butalso has high purity.
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Description

technical field

[0001] The invention relates to the technical field of separation of aromatics, in particular to a 9 A method for separating and purifying trimethylbenzene from heavy aromatic hydrocarbons. Background technique

[0002] mix C 9 Aromatics mainly come from the bottom of the xylene tower of the reforming unit of the refinery. It is an important petrochemical basic raw material and is very rich in resources. It contains a large amount of trimethylbenzene, mesitylene, trimethylbenzene, indane, etc. Precious resource with high economic value. Trimethylbenzene, also known as 1,2,3-trimethylbenzene, is mainly used in the preparation of aniline dyes, alkyd resins, polyester resins and diphthalic acid. At present, trimethylbenzene mainly exists in the by-product solvent oil of trimethylbenzene. Due to the disclosure of the purity, it is mostly used as a component of blending gasoline or as a general solvent, resulting in a serious waste of resources and low economic...

Claims

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