Method for extracting high-purity cyclohexanol from waste liquid resulting from cyclohexanone production from cyclohexane

Through the method of combining normal pressure crude distillation and vacuum extraction distillation, using triethylene glycol and polyethylene glycol PEG-300 as extraction agents, the problem of difficult separation of cyclohexanol in cyclohexanone waste liquid was solved, and a high-efficiency process was achieved. Purity and high yield separation results, reducing energy consumption and operational complexity.

CN105152865AInactive Publication Date: 2015-12-16TAISHAN MEDICAL UNIV
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Patent Information

Application Number
CN201510471909.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2014-08-25
Publication Date
2015-12-16
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

When the existing technology extracts cyclohexanol from the waste liquid of cyclohexane oxidation to cyclohexanone, the yield is low, the purity is difficult to meet the requirements, the operation is complex, the energy consumption is high, and it is difficult to achieve efficient separation.

Method used

Using a method that combines normal pressure crude distillation and vacuum extraction and distillation, triethylene glycol and polyethylene glycol PEG-300 are used as two-component extraction agents. By adjusting process parameters and extraction agent ratio, the efficient separation of cyclohexanol is achieved.

Benefits of technology

The yield and purity of cyclohexanol are improved, the operation cycle is shortened, energy consumption is reduced, and the separation of cyclohexanol with high purity (>99.3%) and high yield (>92%) is achieved.

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Abstract

The invention discloses a method for extracting cyclohexanol from a waste liquid resulting from cyclohexanone production through oxidation of cyclohexane. The method comprises steps of normal-pressure simple distillation and reduced-pressure extractive distillation. In the step of reduced-pressure extractive distillation, a double-component extractant consisting of triglycol and polyethylene glycol (PEG-300), wherein the weight ratio of triglycol to polyethylene glycol (PEG-300) to the waste liquid resulting from cyclohexanone production is 1:0.8-1.2:1.4-3.1. By adopting the method for extracting cyclohexanol, the yield of cyclohexanol is over 92%, and the purity of prepared cyclohexanol is over 99.3%.
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