Device and method for purifying n-hexane with N,N-dimethylacetamide solvent

A technology of dimethylacetamide and n-hexane, applied in distillation purification/separation, extractive distillation, etc., can solve the problems of high regeneration temperature, high energy consumption, high heat source grade, and achieve a small solvent ratio, low heat source grade, and product quality. high purity effect

Inactive Publication Date: 2017-03-22
DALIAN UNIV OF TECH
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Problems solved by technology

The purity of n-hexane products can reach 98%, but the regeneration temperature of dibutyl phthalate is higher than 220°C, the grade of heat source required for solvent regeneration is high, and the energy consumption of the whole system is relatively large

Method used

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  • Device and method for purifying n-hexane with N,N-dimethylacetamide solvent

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Embodiment

[0022] For a petrochemical company's 8,000-ton / year n-hexane plant, the content of n-hexane in the mixture of alkanes such as n-hexane, methylcyclopentane, 2,3-dimethylbutane, and 2,2-dimethylpentane The content of methylcyclopentane is 12.7%; the content of 2,3-dimethylbutane is 1.3%; the content of 2,2-dimethylpentane is 6.9%; the content of remaining hydrocarbons was 53.5%. After being separated by the device and method of the present invention, the purity of n-hexane reaches 99.1%; wherein, the content of methylcyclopentane is ≤0.8%; 200ppm; the purity of the N,N-dimethylacetamide solvent at the bottom of the solvent regeneration tower is greater than 99.9%.

[0023] Process parameters of the n-hexane tower: the position of the mixed feed plate is 50, the feed temperature is 109°C; the position of the solvent feed plate is 10, the solvent feed temperature is 40°C, the solvent ratio is 8; the operating pressure is 150kPa, and the tower top temperature is 82 °C, the temper...

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Abstract

The invention provides a device and a method for purifying n-hexane with a N,N-dimethylacetamide solvent. The device comprises an n-hexane tower, an n-hexane tower top condenser, an n-hexane tower reflux tank, an n-hexane tower reflux pump, an n-hexane tower reboiler, an n-hexane tower reactor liquid pump, a solvent regeneration tower, a solvent regeneration tower top condenser, a solvent regeneration tower reflux tank, a solvent regeneration tower reflux pump, a solvent regeneration tower reboiler, a solvent regeneration tower reactor liquid pump and a poor solvent cooler. The method comprises the following steps: firstly, introducing mixed materials into the n-hexane tower, wherein the n-hexane tower is an extraction and rectification tower; introducing N,N-dimethylacetamide, serving as an extraction solvent, from the upper part of the n-hexane tower. A tower top n-hexane product is up to 99.1 percent in purity. Compared with the conventional process, the method has the advantages of simple flow, high product purity, small solvent ratio, low level of a required thermal source in a solvent regeneration process, small loss amount of the solvent and the like.

Description

technical field [0001] The invention belongs to the field of petrochemical hexane solvents, and relates to a device and method for purifying n-hexane by using N,N-dimethylacetamide solvent. Specifically, on the basis of the existing conventional technology, the extractive distillation method is used to separate the n-hexane-methylcyclopentane system. Wherein, N, N-dimethylacetamide is selected as the extractant, and the purity of n-hexane after purification is greater than 99%. Background technique [0002] n-Hexane is an important chemical raw material and solvent, widely used in medicine, food industry, petrochemical industry and other fields. The raw material for the production of n-hexane is mostly the raffinate oil from the aromatics extraction unit in the reforming unit. The components in the raffinate oil are complex, mainly C4-C8 alkanes, mixed with a small amount of olefins and aromatics. The main methods for separating n-hexane in industry are: ordinary distilla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/15C07C7/08B01D3/40
CPCC07C7/08B01D3/40C07C9/15
Inventor 杨书航王涛邹雄韩志忠
Owner DALIAN UNIV OF TECH
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