A method for extracting and rectifying separation of toluene and n-butanol mixture

An extractive distillation and extractive distillation column technology, which is applied in the separation and purification field of the chemical industry, can solve the problems of high energy consumption, complex operation process and large reflux in the rectification process, and achieves strong operability, simple process, solvent The effect of ratio and reflux ratio is small

Active Publication Date: 2018-09-28
QINGDAO UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] The defects and deficiencies existing in the above-mentioned existing separation technology are: in the operation process of separating the azeotrope in the high and low pressure column of pressure swing rectification, the pressure requirement is relatively strict, so higher requirements are put forward for the performance of the column equipment; In the case of distillative separation of acetonitrile-toluene, due to the selection of the extractant, the reflux is relatively large, and the energy consumption in the rectification process is too high; the operation process is relatively complicated; the purity of the recovered products is less than 99.9%, and the purity is relatively low

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  • A method for extracting and rectifying separation of toluene and n-butanol mixture

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Effect test

Embodiment 1

[0057] The feed temperature is 25° C., the flow rate is 500 kg / h, the pressure is 1 atm, and the feed contains 40% toluene and 60% n-butanol. The number of theoretical plates of the extractive distillation column is 36, the inner diameter of the column is 0.31m, the number of feeding plates of the mixture of toluene and n-butanol is 25, and the flow rate of the extractant dimethyl sulfoxide is 1000kg / h (the solvent ratio is 2:1), The number of feeding plates for the extractant is 15; the number of theoretical plates for the extraction agent recovery tower is 40, the inner diameter of the tower is 0.32m, and the number of feeding plates is 20. The operating pressure of the extractive distillation tower is 1 atm, the reflux ratio is 0.85, the temperature at the top of the tower is 110.7°C, and the temperature at the bottom of the tower is 160.5°C; The bottom temperature is 190.7°C. The purity of toluene after separation is 99.9%, the recovery rate of toluene is 99.9%, the purit...

Embodiment 2

[0059] The feed temperature is 25° C., the flow rate is 500 kg / h, the pressure is 1 atm, and the feed contains 60% toluene and 40% n-butanol. The number of theoretical plates of the extractive distillation column is 38, the inner diameter of the column is 0.34m, the number of feeding plates of the mixture of toluene and n-butanol is 28, and the flow rate of the extractant dimethyl sulfoxide is 1000kg / h (the solvent ratio is 2:1), The number of feeding plates for the extractant is 18; the number of theoretical plates for the extraction agent recovery tower is 42, the inner diameter of the tower is 0.35m, and the number of feeding plates is 20. The operating pressure of the extractive distillation tower is 1 atm, the reflux ratio is 0.9, the temperature at the top of the tower is 111°C, and the temperature at the bottom of the tower is 162.2°C; The bottom temperature is 191.3°C. The purity of toluene after separation is 99.9%, the recovery rate of toluene is 99.9%, the purity o...

Embodiment 3

[0061] The feed temperature is 25° C., the flow rate is 500 kg / h, the pressure is 1 atm, and the feed contains 80% toluene and 20% n-butanol. The theoretical plate number of the extractive distillation column is 40, the inner diameter of the column is 0.38m, the number of feeding plates for the mixture of toluene and n-butanol is 30, and the flow rate of the extractant dimethyl sulfoxide is 1000kg / h (the solvent ratio is 2:1), The number of feeding plates for the extractant is 20; the number of theoretical plates for the extraction agent recovery tower is 45, the inner diameter of the tower is 0.39m, and the number of feeding plates is 22. The operating pressure of the extractive distillation tower is 1 atm, the reflux ratio is 0.94, the temperature at the top of the tower is 119.5°C, and the temperature at the bottom of the tower is 164.1°C; The bottom temperature is 192.2°C. The purity of toluene after separation is 99.9%, the recovery rate of toluene is 99.9%, the purity o...

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Abstract

The invention relates to a method for separating methylbenzene and n-butyl alcohol mixture through extractive distillation. The method comprises the steps that dimethyl sulfoxide is used as an extracting agent to be introduced from the upper portion of an extractive distillation tower to make sufficient contact with the methylbenzene and n-butyl alcohol mixture introduced from the middle of the extractive distillation tower, after extractive distillation, methylbenzene is extracted from the top of the extractive distillation tower, and the extracting agent and n-butyl alcohol mixture enters an extracting agent recycling tower from the bottom of the extractive distillation tower. Through effective separation, n-butyl alcohol is extracted from the top of the extracting agent recycling tower, and the extracting agent is extracted from the bottom of the extracting agent recycling tower to be recycled. The process has the advantages of being low in energy consumption, simple in process, high in separation purity and the like.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in the chemical industry, in particular to a method for extracting and rectifying the separation of a mixture of toluene and n-butanol. 【Background technique】 [0002] Toluene is widely used as a solvent and high-octane gasoline additive, and is also an important raw material for organic chemical industry. A series of intermediates derived from toluene are widely used in the production of fine chemicals such as dyes, medicines, pesticides, gunpowder, additives, and spices, as well as in the synthetic material industry. Benzyl chloride, benzyl dichloride and benzyl trichloride obtained by side-chain chlorination of toluene, including their derivatives benzyl alcohol. The cyclic chlorination products of toluene are intermediates of pesticides, medicines and dyes. Toluene is oxidized to obtain benzoic acid, which is an important food preservative and also used as an intermediate in orga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/08C07C15/06C07C29/84C07C31/12B01D11/04
CPCB01D11/0492C07C7/08C07C29/84C07C15/06C07C31/12
Inventor 朱兆友王勇赵婷然贾慧王英龙
Owner QINGDAO UNIV OF SCI & TECH
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