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Method for separating isopropanol and water by extractive distillation

A technology of extractive distillation and extractive distillation tower, which is applied in the field of wastewater treatment, can solve the problems of low economic return and low efficiency of cyclohexane entrainer, and achieve the effect of improving economic benefits

Pending Publication Date: 2022-01-25
江苏三贵资源再生有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For above-mentioned deficiencies in the prior art, the present invention provides the method for extraction rectification separation isopropanol and water, purpose is in order to solve the existing extraction method to waste liquid isopropanol, can only obtain isopropanol and water by ordinary rectification The azeotropic composition of water has low economic returns; and the technical problem that cyclohexane is not efficient as an entrainer in the process of azeotropic dehydration with cyclohexane

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  • Method for separating isopropanol and water by extractive distillation
  • Method for separating isopropanol and water by extractive distillation

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Embodiment 1

[0019] The method for extracting and rectifying separation of isopropanol and water provided by the invention, the specific technical scheme is as follows:

[0020] The method for separating isopropanol and water by extractive distillation comprises the steps:

[0021] S1, after the isopropanol waste liquid containing 20wt% isopropanol is separated through the azeotropic rectification tower, the azeotrope of isopropanol and water containing 87wt% isopropanol is obtained at the top of the azeotropic rectification tower , water is obtained at the bottom of the azeotropic distillation tower. The top pressure of the azeotropic rectification tower is 50kpa absolute pressure, the top temperature is 63°C, the bottom temperature is 81°C, and the reflux ratio is 1.5.

[0022] S2, using the extractant to extract the azeotrope of isopropanol and water in the rectification separation step S1, the extractant is ethylene glycol, after being separated by the extractive distillation tower, t...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for separating isopropanol and water through extractive distillation. The method for separating isopropanol and water through extractive distillation comprises the following steps: carrying out azeotropic distillation in an azeotropic distillation tower to obtain an azeotrope of isopropanol and water, and carrying out extractive distillation on the azeotrope of isopropanol and water by adopting ethylene glycol as an extracting agent to obtain isopropanol with the purity of 99%. According to the invention, the economic benefit is improved, and the extraction agent is recycled without loss.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for separating isopropanol and water through extraction and rectification. Background technique [0002] Isopropyl alcohol is an important raw material and solvent for pesticides, dyes, medicines and spices, mainly used in pharmaceuticals, cosmetics, plastics, spices, coatings and electronics industries as a dehydrating agent, as well as raw materials and solvents for the preparation of pesticide intermediates; in addition, It is also widely used as a cleaning agent for circuit boards and electronic equipment manufacturing industries. In the production of chemical, pharmaceutical and pesticide intermediates and semiconductors, isopropanol is widely used as a solvent or raw material. During the production process, a certain amount of mixed solution of isopropanol and water will be produced. For the separation of isopropanol and water, domestic and...

Claims

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Application Information

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IPC IPC(8): C07C31/10C07C29/82C07C29/84C07C29/80
CPCC07C29/80C07C29/82C07C29/84C07C31/10
Inventor 柴青王毅张新党龚丽芳
Owner 江苏三贵资源再生有限公司