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Extractive distillation process for extracting cyclohexanol from cyclohexanone liquid waste

A cyclohexanone waste liquid, extraction and distillation technology, applied in the field of organic solvent recovery, can solve the problems of limited application of extraction and rectification, low solubility, solvent immiscibility, etc., achieve comprehensive utilization of resources, shorten operation cycle, The effect of reducing production costs

Inactive Publication Date: 2015-11-18
TAISHAN MEDICAL UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0017] Extractive distillation generally uses a single solvent as the extractant traditionally, but solvents with high selectivity are often accompanied by immiscibility or low solubility, so it is necessary to select a suitable solvent through trade-offs so that it has good selectivity , and has high solubility, the two are often difficult to balance perfectly, which also directly limits the application of extractive distillation in more fields

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  • Extractive distillation process for extracting cyclohexanol from cyclohexanone liquid waste
  • Extractive distillation process for extracting cyclohexanol from cyclohexanone liquid waste
  • Extractive distillation process for extracting cyclohexanol from cyclohexanone liquid waste

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Embodiment 1

[0037] A method for extracting cyclohexanol from cyclohexane oxidation system cyclohexanone waste liquid, comprising the following steps:

[0038] Atmospheric crude distillation:

[0039] (1) Vacuum the cyclohexanone waste liquid into the still, open the steam valve, and heat the materials in the still;

[0040] (2) Adjust the steam pressure to 0.2-0.7MPa, and observe the temperature changes in the kettle and at the top of the tower;

[0041] (3) The light oil components in the waste liquid azeotrope with a small amount of water and gradually evaporate from the distillation tower, and intercept the condensate with a gas phase temperature of 40-100 °C. When it is observed that the gas phase temperature rises after a pause of 100°C for a period of time, close the steam valve to stop heating. Put the intercepted condensate with a gas phase temperature of 40-100°C into the settling tank from the receiving tank, and after 24-48 hours of natural settlement in the settling tank, th...

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Abstract

The invention discloses a method for extracting cyclohexanol from waste liquor obtained by cyclohexanone preparation by cyclohexane oxidation. The method comprises the steps of normal-pressure crude distillation and reduced-pressure extraction and rectification. The extractant in the reduced-pressure extraction and rectification is a double-component extractant composed of triglycol and polyethyleneglycol (PEG-300), and the weight ratio of the triglycol to the PEG-300 to the cyclohexanone waste liquor is 1:(0.8-1.2):(1.4-3.1). By adopting the cyclohexanol extraction method, the cyclohexanol yield is higher than 92%, and the purity of the prepared cyclohexanol finished product is higher than 99.3%.

Description

[0001] The present invention is a divisional application of application number 201410420015.3, application date: August 25, 2014, and title of invention: "A method for extracting cyclohexanol from waste liquid of cyclohexanone oxidized to cyclohexanone". technical field [0002] The invention relates to a method for recovering organic solvents in the field of hazardous waste disposal industry, more specifically, relates to a method for extracting cyclohexanol from cyclohexanone oxidation waste liquid produced from cyclohexanone. Background technique [0003] Cyclohexanol is mainly used in the production of adipic acid, caprolactam, nitrocellulose paint, nylon 66, nylon 6, plasticizers, disinfectants, insecticides, herbicides, fungicides, fiber finishing agents, petroleum processing aids, Rubber additives, pharmaceuticals, cosmetics, etc.; as a widely used high-boiling solvent, used as a solvent for paint, shellac, varnish, rubber, resin, and dyes; used as a leather degrease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/28C07C27/32C07C29/80C07C29/84C07C35/08C07C45/82C07C45/83C07C49/403
CPCC07C29/80C07C29/84C07C45/82C07C45/83C07C2601/14C07C35/08C07C49/403
Inventor 张恭孝张泽玮郭学阳刘梅王青青熊激光朱浩慧
Owner TAISHAN MEDICAL UNIV
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