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Method and equipment for separating and purifying ethylene glycol-cyclohexanone mixed solvent

A technology for separation and purification and mixed solvent, which is applied in the field of separation and purification of ethylene glycol-cyclohexanone mixed solvent, and can solve the problems of difficult separation of ethylene glycol low-boiling substances, difficulty in cooling low-boiling substances, and burden on environmental protection facilities. , to achieve the effect of stable operation, simple production process and cost saving

Inactive Publication Date: 2021-10-22
四川熔增环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high boiling point of ethylene glycol, it has the characteristics of high energy consumption when using normal pressure distillation, and it is difficult to separate the low boiling substances in ethylene glycol.
If vacuum distillation is used, it will make it difficult to cool the low-boiling matter, which will cause a greater burden on environmental protection facilities. In view of this, this case arises after in-depth research on the above-mentioned problems.

Method used

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  • Method and equipment for separating and purifying ethylene glycol-cyclohexanone mixed solvent
  • Method and equipment for separating and purifying ethylene glycol-cyclohexanone mixed solvent
  • Method and equipment for separating and purifying ethylene glycol-cyclohexanone mixed solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: Take the waste material containing 80% ethylene glycol and 10-20% cyclohexanone from the waste liquid tank 1. After preheating to 90 ° C, feed low-pressure steam to drain into the desorption tower 2, and open the transfer valve 21 Close the feeding valve 20, run through the relay driver 14, drive the relay drive helical gear 15 on the drive end of the relay driver 14 to rotate, and drive the relay drive helical gear 16 meshed with it to rotate through the relay drive helical gear 15, The transfer threaded pipe 17 on it is driven to rotate through the transfer transmission helical gear 16, and the transfer threaded rod 18 inside is driven to rotate through the transfer threaded pipe 17, so that the transfer threaded rod 18 moves up and down along the transfer threaded pipe 17, so as to drive the transfer The transfer lifting extrusion plate 19 on the threaded rod 18 rises through the transfer lifting extrusion plate 19, so that the gas in the raw material bo...

Embodiment 2

[0040]Embodiment 2: Take the waste material containing 70% of ethylene glycol and 20-30% of cyclohexanone from the waste liquid tank 1. After preheating to 85°C, feed low-pressure steam into the desorption tower 2 and open the transfer valve 21 Close the feeding valve 20, run through the relay driver 14, drive the relay drive helical gear 15 on the drive end of the relay driver 14 to rotate, and drive the relay drive helical gear 16 meshed with it to rotate through the relay drive helical gear 15, The transfer threaded pipe 17 on it is driven to rotate through the transfer transmission helical gear 16, and the transfer threaded rod 18 inside is driven to rotate through the transfer threaded pipe 17, so that the transfer threaded rod 18 moves up and down along the transfer threaded pipe 17, so as to drive the transfer The transfer lifting extrusion plate 19 on the threaded rod 18 rises through the transfer lifting extrusion plate 19, so that the gas in the raw material box 12 is...

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Abstract

The invention discloses a method and equipment for separating and purifying an ethylene glycol-cyclohexanone mixed solvent. The method and equipment have the beneficial effects that a series of low-energy-consumption processes for removing low-boiling-point impurities such as cyclohexanone in waste ethylene glycol are carried out through gas stripping, reduced-pressure rectification, normal-pressure recovery and reduced-pressure recovery, the waste ethylene glycol with the purity of only 40-95% (wt) is purified into industrial organic solvent ethylene glycol with the purity of more than or equal to 99.0% (wt) and industrial cyclohexanone with the purity of more than or equal to 99.5%, so that the waste ethylene glycol is recycled, and the production cost is saved. The purification method provided by the invention also has the advantages of high yield, low energy consumption, high quality, recyclability, simple and convenient production process, stable operation, suitability for industrial production and the like.

Description

technical field [0001] The invention relates to the technical field of separation and recovery of mixed solvents, in particular to a separation and purification method and equipment for ethylene glycol-cyclohexanone mixed solvents. Background technique [0002] At present, the application of extractive distillation is more and more common, and it has become an important separation method in the petrochemical industry. Extractive distillation is to add an extractant to the mixture, whose boiling point is significantly higher than any component in the raw material liquid, and has a strong attraction with a certain component in the raw material liquid, which can significantly reduce the concentration of this component. Vapor pressure, thereby increasing the relative volatility between the two components of the raw material liquid, the azeotropic point disappears, and then the method of rectification is used to achieve separation. Extractive distillation can be divided into ord...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/76C07C29/80C07C31/20C07C45/81C07C45/80C07C45/82C07C49/403B01D3/10B01D3/14B01D3/38
CPCC07C29/76C07C29/80C07C45/81C07C45/80C07C45/82B01D3/14B01D3/143B01D3/10B01D3/38C07C2601/14C07C31/202C07C49/403
Inventor 范文林鲁加峰张怡黄啟虓
Owner 四川熔增环保科技有限公司