Method for extracting 2,6-dimethylphenol from crude phenol and device applied to method

A technology of xylenol and crude phenol, which is applied in the field of coal chemical industry, can solve the problems of poor selectivity, and achieve the effects of high quality, reduced gas phase load, and good stability

Active Publication Date: 2018-01-09
SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of 2,6-xylenol in nature is very small. At present, the synthesis method is mainly used to obtain 2,6-xylenol. Metal oxides such as magnesium oxide are often used as catalysts, which need to be reacted at high temperature and have high selectivity. Not strong, and will produce a large proportion of para-products at the same time
[0004] Although the above-mentioned technology separates m-p-cresol and xylenol, in the separation proces

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting 2,6-dimethylphenol from crude phenol and device applied to method
  • Method for extracting 2,6-dimethylphenol from crude phenol and device applied to method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1

[0037] This embodiment provides a method for extracting 2,6-xylenol from crude phenol, which includes the following steps:

[0038] 1) Select crude phenol raw material, which contains 0.18wt% of light components such as phenol, 5.03wt% of 2,6-xylenol, 66.51wt% of meta-cresol and 28.28wt% of other two Heavy components such as cresol, and preheat the crude phenol raw material to 155°C;

[0039] 2) The crude phenol raw material preheated in step 1) is continuously sent to the first-stage distillation tower at a flow rate of 2.5t / h for the first-stage distillation treatment, and the operating pressure of the first-stage distillation treatment is controlled to 25KPa and the operating temperature The temperature is 130℃, the reflux ratio is 14, and the lighter components that are lighter than 2,6-xylenol are removed and drawn from the top of the primary distillation tower. The primary distillation product and the primary distillation product are collected from the botto...

Example Embodiment

[0041] Example 2

[0042] This embodiment provides a method for extracting 2,6-xylenol from crude phenol, which includes the following steps:

[0043] 1) Select crude phenol raw material, which contains 0.22wt% of light components such as phenol, 2.07wt% of 2,6-xylenol, 66.56wt% of meta-cresol and 31.15wt% of other two Heavy components such as cresol, and preheat the crude phenol raw material to 154°C;

[0044] 2) The crude phenol raw material preheated in step 1) is continuously sent to the first-stage rectification tower at a flow rate of 2.5t / h for the first-stage rectification treatment, and the operating pressure of the first-stage rectification treatment is controlled to be 0.5Pa. The temperature is 160℃, the reflux ratio is 5, the lighter components lighter than 2,6-xylenol are removed, and they are drawn from the top of the primary distillation tower, and the primary distillation product is collected from the bottom of the tower, and the primary distillation The content of ...

Example Embodiment

[0046] Example 3

[0047] This embodiment provides a method for extracting 2,6-xylenol from crude phenol, which includes the following steps:

[0048] 1) Select crude phenol raw material, which contains 0.05wt% of light components such as phenol, 15wt% of 2,6-xylenol, 60wt% of meta-cresol and 24.5wt% of other xylenol Equal weight components, and preheat the crude phenol raw material to 153°C;

[0049] 2) The crude phenol raw material preheated in step 1) is continuously sent to the first-stage distillation tower at a flow rate of 2.5t / h for the first-stage distillation treatment, and the operating pressure of the first-stage distillation treatment is controlled to 50KPa and the operating temperature It is 100℃, reflux ratio is 20, and the lighter components lighter than 2,6-xylenol are removed, and they are drawn from the top of the primary distillation tower, and the primary distillation product and primary distillation product are collected from the bottom of the tower. The conte...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for extracting 2,6-dimethylphenol from crude phenol and a device applied to the method. A two-stage distillation technology is adopted for the method, primary distillation treatment is performed on crude phenol firstly to remove light components lighter than 2,6-dimethylphenol, the light components are prevented from affecting the effect of follow-up secondary distillation treatment, and product yield and quality of 2,6-dimethylphenol are improved; then secondary distillation treatment under specific operation conditions is performed, especially, the operationpressure of the secondary distillation treatment is controlled to be not higher than 5 KPa, so that on one hand, the relative volatility of 2,6-dimethylphenol and other components in a primary distillation product is improved and high-concentration 2,6-dimethylphenol can be obtained by extraction, on the other hand, 2,6-dimethylphenol cannot have an isomerism change in the distillation processes,and the 2,6-dimethylphenol separation effect is guaranteed. Tests prove that the yield of 2,6-dimethylphenol is as high as 99.98%, and the purity is as high as 99.9%.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a method and device for extracting 2,6-xylenol from crude phenol, in particular to a method for extracting 2,6-xylenol from crude meta-p-cresol Method and device thereof. Background technique [0002] 2,6-Xylenol is an important chemical raw material and fine chemical intermediate, which can be used in the production of polyphenylene ether resins, photographic chemicals, pesticides, polyester and polyether resins, and can also be used as raw materials for antiarrhythmic drugs. The amount of 2,6-xylenol in nature is very small. At present, the synthesis method is mainly used to obtain 2,6-xylenol. Metal oxides such as magnesium oxide are often used as catalysts, which need to be reacted at high temperature and have high selectivity. Not strong, and a larger proportion of para-products will be produced at the same time. [0003] The crude phenol extracte...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07C37/74C07C39/08B01D3/14B01D3/32
Inventor 不公告发明人
Owner SHAANXI COAL & CHEM IND GRP SHENMU TIANYUAN CHEM IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap