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Method for separating m- and p-methylethylbenzene from aromatic hydrocarbon mixture

A p-toluene and mixture technology, applied in the field of p-toluene and separation, can solve the problems of theoretical plate number and high reflux

Active Publication Date: 2017-07-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High theoretical plate count and reflow ratio required for this method

Method used

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  • Method for separating m- and p-methylethylbenzene from aromatic hydrocarbon mixture
  • Method for separating m- and p-methylethylbenzene from aromatic hydrocarbon mixture
  • Method for separating m- and p-methylethylbenzene from aromatic hydrocarbon mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] according to figure 1 As shown, 3000g of aromatics mixture is introduced into the crude fractionation tower, and carbon eight and carbon eight components are extracted from the top of the crude fractionation tower, and the bottom liquid of the crude fractionation tower is introduced into the first fractionation column for intermittent rectification. The stream containing m- and p-methylethylbenzene is drawn from the top of the sub-column to enter the second fractionating column for intermittent rectification, and m- and p-methylethylbenzene products are obtained from the bottom of the second fractionating column. The first fine fractionation tower and the second fine fractionation tower are respectively provided with double accumulation tanks. Based on the total mass of the aromatic hydrocarbon mixture, in the aromatic hydrocarbon mixture, the mass percentage of toluene is 71.71%, the mass percentage of n-propylbenzene is 0.77%, the mass percentage of m-methylethylbenze...

Embodiment 2

[0036] according to figure 1 As shown, 3000g of aromatics mixture is introduced into the crude fractionation tower, and carbon eight and carbon eight components are extracted from the top of the crude fractionation tower, and the bottom liquid of the crude fractionation tower is introduced into the first fractionation column for intermittent rectification. The stream containing m- and p-methylethylbenzene is drawn from the top of the sub-column to enter the second fractionating column for intermittent rectification, and m- and p-methylethylbenzene products are obtained from the bottom of the second fractionating column. The first fine fractionation tower and the second fine fractionation tower are respectively provided with double accumulation tanks. Based on the total mass of the aromatic hydrocarbon mixture, in the aromatic hydrocarbon mixture, the mass percentage of toluene is 79.47%, the mass percentage of n-propylbenzene is 0.65%, the mass percentage of m-methylethylbenze...

Embodiment 3

[0038] according to figure 1 As shown, 3000g of aromatics mixture is introduced into the crude fractionation tower, and carbon eight and carbon eight components are extracted from the top of the crude fractionation tower, and the bottom liquid of the crude fractionation tower is introduced into the first fractionation column for intermittent rectification. The stream containing m- and p-methylethylbenzene is drawn from the top of the sub-column to enter the second fractionating column for intermittent rectification, and m- and p-methylethylbenzene products are obtained from the bottom of the second fractionating column. The first fine fractionation tower and the second fine fractionation tower are respectively provided with double accumulation tanks. Based on the total mass of the aromatic hydrocarbon mixture, in the aromatic hydrocarbon mixture, the mass percentage of toluene is 75.78%, the mass percentage of n-propylbenzene is 0.89%, the mass percentage of m-methylethylbenze...

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Abstract

The invention relates to a method for separating m- and p-methylethylbenzene from aromatic hydrocarbon mixtures, and mainly solves the technical problem that the intermediate and p-methylethylbenzene of aromatic hydrocarbon mixtures are difficult to separate. The present invention introduces the aromatic hydrocarbon mixture into the rough fractionation tower, removes carbon 8 and carbon 8 former components from the top of the rough fractionation tower, and introduces the bottom liquid of the crude fractionation tower into the first fine fractionation tower with double liquid accumulation tanks on the top of the tower. , the light components containing m- and p-methylethylbenzene are drawn from the top of the first fractionation column to enter the second fractionation column with double liquid accumulation tanks, and the mixture of n-propylbenzene and cumene is drawn from the top of the second fractionation column. The technical scheme of extracting m- and p-methylethylbenzene products from the tower kettle of the difinishing tower solves the above-mentioned technical problems well, and can be applied in the field of separating aromatic hydrocarbon mixtures. The advantage of the double liquid accumulation tanks on the top of the tower is that the batch rectification can always be operated under the condition of total reflux, thereby reducing the number of theoretical plates of the column, and the alternate operation of the double liquid accumulation tanks can realize the vacuum intermittent distillation.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for separating aromatic hydrocarbon mixtures, in particular to a method for separating m- and p-methylethylbenzene from aromatic hydrocarbon mixtures. Background technique [0002] In addition to triphenyl, the C9 aromatics in the aromatic mixture are also important chemical raw materials, especially m- and p-methylethylbenzene. Its dehydrogenation product, methyl styrene, has a wide range of uses. [0003] At present, the separation of m- and p-methylethylbenzene from C9 aromatics mainly includes catalyst addition rectification and precision rectification. Among them, precision rectification has always been a hopeful research direction for the separation of C9 aromatics because it does not need to add other components and the process is simple. However, due to the small difference in boiling points of the components in C9 aromatics, the number of theoretical plates requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/02C07C7/04
Inventor 田立达顾军民韩诚康
Owner CHINA PETROLEUM & CHEM CORP
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