Technology for separating n-hexane-methylcyclopentane through extractive distillation

Abstract

A technology for separating n-hexane-methylcyclopentane through extractive distillation comprises the steps as follows: light components are removed from industrial raw materials containing n-hexane and methylcyclopentane in a light component removal column, the materials without light components enter a heavy component removal column for separation to obtain heavy components and the material without the heavy components, and the materials without the heavy components enter an extractive distillation column for separation of n-hexane and methylcyclopentane; n-hexane flows out of the column top, and a mixed solution of an extraction agent and methylcyclopentane is extracted from a column kettle; and the mixed solution is subjected to regeneration treatment in an extraction agent recovery tower to realize recycling of the extraction agent. The technology has the advantages of simple technological process, low extraction agent price, recycling, high product purity, high yield, lower energy consumption and environmental friendliness.

Description

technical field [0001] The invention belongs to a process for separating n-hexane-methylcyclopentane, in particular to a process for separating the mixture of n-hexane and methylcyclopentane through extraction and rectification. Background technique [0002] n-Hexane is an important chemical raw material and solvent, widely used in medicine, chemical analysis and chemical production industries. Industrial hexane production widely uses straight-run gasoline or aromatic raffinate as raw material. Due to the complexity of the components in the raw materials, the content of each component in the raw materials from different sources fluctuates greatly. At the same time, considering that the boiling point of n-hexane (68.7°C) is very close to that of methylcyclopentane (71.8°C), ordinary rectification High-purity n-hexane and methylcyclopentane cannot be obtained with high-purity technology; when using methanol azeotropic distillation for separation and purification, because meth...

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Problems solved by technology

Due to the complexity of the components in the raw materials, the content of each component in the raw materials from different sources fluctuates greatly. At the same time, considering that the boiling point of n-hexane (68.7°C) is very close to that of methylcyclopentane (71.8°C), ordinary rectification High-purity n-hexane and methylcyclopentane cannot be obtained with high-purity technology; when using methanol azeotropic distillation for separation and purification, because methanol and n-hexane can also form an azeotrope, high-purity n-hexane products cannot be obtained; there are also domestic and foreign The laboratory uses molecular sieve adsorption to conduct separation research, and can obtain more than 99% high-purity n-hexane. However, molecular sieves have defects such as easy saturation of adsorption, difficult regeneration, and high cost of industrial-scale production, so it is difficult to put into industrial-scale production. In the process; extractive distillation is a relatively good method for separating n-hexane and methylcyclopentane, which can reduce the cost of large-scale production while producing high-purity n-hexane. However, using extractive distillation The key to obtaining high-purity n-hexane and methylcyclopentane is to find a suitable extractant for n-hexane and methylcyclopentane

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