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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

Inactive Publication Date: 2021-03-09
连云港鹏辰特种新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent CN201811520713.5 provides a process for separating and purifying pyrylene, which uses reformed heavy aromatics as raw material, and uses rectification to separate the raw material oil, and the light components can be refined to obtain mesitylene and mesitylene. The components with a distillation range of 170-190°C in the heavy fraction enter the molecular sieve membrane separator, the pressure is normal pressure, the temperature is 60-180°C, the pore size of the molecular sieve membrane is 5.0-7.0Aring, and the purity obtained after separation is not less than 95%. trimethylbenzene, other heavy components can be used as heavy aromatics solvent oil, as can be seen from the above-mentioned prior art, although the higher purity of trimethylbenzene can be obtained in the current technology, the yield is low, and the purity needs to be further improved

Method used

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  • Method for separating and purifying trimethyl benzene from C9 heavy aromatics
  • Method for separating and purifying trimethyl benzene from C9 heavy aromatics

Examples

Experimental program
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Effect test

Embodiment 1

[0028](1) 10g graphene nanosheets and 100ml dehydrated alcohol are mixed and ultrasonically treated, and the graphene nanosheets after the treatment are placed in the mixed solution of 42ml magnesium chloride and aluminum chloride, and the concentrations of magnesium chloride and aluminum chloride in the mixed solution are respectively 2mol / L, 1mol / L, then slowly drop 12g15wt% urea solution and 10g5wt% polyvinyl alcohol solution, the rate of addition of urea solution, polyvinyl alcohol solution is controlled to be 1.55ml / min, 1.25ml / min; Under reflux for 15 hours, cool to room temperature after the reaction, filter the reaction liquid, wash the obtained solid and dry it, and finally place it in the air atmosphere of the muffle furnace, firstly raise the temperature to 300°C at a rate of 3°C / min, and keep it warm for 10min , and then heated up to 450°C at a rate of 7°C / min, and kept for 1h; a porous magnesium / aluminum metal oxide coating was prepared on the surface of the graphe...

Embodiment 2

[0034] (1) 10g graphene nanosheets and 100ml dehydrated alcohol are mixed and ultrasonically treated, and the graphene nanosheets after the treatment are placed in the mixed solution of 42ml magnesium chloride and aluminum chloride, and the concentrations of magnesium chloride and aluminum chloride in the mixed solution are respectively It is 3mol / L, 1mol / L, then slowly add dropwise 20g15wt% urea solution and 10g5wt% polyvinyl alcohol solution, the rate of addition of urea solution, polyvinyl alcohol solution is controlled as 1.55ml / min, 1.25ml / min; Under reflux for 20 hours, after the reaction, cool to room temperature, filter the reaction solution, wash and dry the obtained solid, and finally place it in the air atmosphere of the muffle furnace, first raise the temperature to 300°C at a rate of 3°C / min, and keep it for 10 minutes , and then heated up to 450°C at a rate of 7°C / min, and kept for 3h; a porous magnesium / aluminum metal oxide coating was prepared on the surface of ...

Embodiment 3

[0040] (1) 10g graphene nanosheets and 100ml dehydrated alcohol are mixed and ultrasonically treated, and the graphene nanosheets after the treatment are placed in the mixed solution of 42ml magnesium chloride and aluminum chloride, and the concentrations of magnesium chloride and aluminum chloride in the mixed solution are respectively Be 2mol / L, 1mol / L, then slowly drop 15g15wt% urea solution and 10g5wt% polyvinyl alcohol solution, the rate of addition of urea solution, polyvinyl alcohol solution is controlled as 1.55ml / min, 1.25ml / min; Under reflux for 15 hours, cool to room temperature after the reaction, filter the reaction liquid, wash the obtained solid and dry it, and finally place it in the air atmosphere of the muffle furnace, firstly raise the temperature to 300°C at a rate of 3°C / min, and keep it warm for 10min , and then heated up to 450°C at a rate of 7°C / min, and kept for 2h; a porous magnesium / aluminum metal oxide coating was prepared on the surface of the graph...

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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.

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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Application Information

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IPC IPC(8): C07C2/86C07C7/00C07C7/04C07C7/14C07C7/148C07C15/02B01J23/20B01J35/10B01J37/02B01J37/03
CPCC07C2/864C07C7/005C07C7/04C07C7/14C07C7/14866B01J37/035B01J37/0242B01J23/20B01J35/61C07C15/02
Inventor 江晓龙谈勇谈俊
Owner 连云港鹏辰特种新材料有限公司
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