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Method for separation of m/4-ethyltoluene from aromatic hydrocarbon mixture

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

Active Publication Date: 2016-04-20
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 separation of m/4-ethyltoluene from aromatic hydrocarbon mixture
  • Method for separation of m/4-ethyltoluene from aromatic hydrocarbon mixture
  • Method for separation of m/4-ethyltoluene from aromatic hydrocarbon mixture

Examples

Experimental program
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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 separation of m / 4-ethyltoluene from an aromatic hydrocarbon mixture, and mainly solves the technical problem of difficult separation of m / 4-ethyltoluene from an aromatic hydrocarbon mixture. According to a technical scheme, the aromatic hydrocarbon mixture is introduced into a coarse separation tower, C8 and C8 pre-components are removed from the coarse separation tower top, the coarse separation tower bottom liquid is introduced into a first fine separation tower equipped with double liquid accumulation tanks at the top, a light component containing m / 4-ethyltoluene is led out from the first fine separation tower top into a second fine separation tower equipped with double liquid accumulation tanks, a n-propylbenzene and cumene mixture is led out from the second fine separation tower top, and the m / 4-ethyltoluene product is led out from the second fine separation tower bottom. The method provided by the invention well solves the technical problem, and can be applied to the aromatic hydrocarbon mixture separation field. With double tower top liquid accumulation tanks, batch rectification can be operated under the total reflux condition, thereby reducing the number of theoretical plates of the tower, and the alternating operation of the double liquid accumulation tanks can realize pressure reduced batch rectification.

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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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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