Method and apparatus for separating and purifying ethyl vanillin by decompression and continuous distillation in dividing wall column

A technology for ethyl vanillin and rectification separation, which is applied in the field of separation and purification of ethyl vanillin by continuous vacuum distillation of a dividing wall column, can solve problems such as no reports, and achieve the effect of reducing investment costs.

Inactive Publication Date: 2009-04-29
HUNAN ASTAR BIO CHEM TECH
View PDF4 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separation and purification of ethyl vanillin by continuous distillation under reduced pressure in a dividing wall column has not been reported at home and abroad so far

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 and apparatus for separating and purifying ethyl vanillin by decompression and continuous distillation in dividing wall column
  • Method and apparatus for separating and purifying ethyl vanillin by decompression and continuous distillation in dividing wall column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The composition of crude ethyl vanillin is as follows: light component 4.5%, ethyl vanillin 82.5%, heavy component 13%. It is separated and purified by conventional continuous distillation under reduced pressure. The diameter of the two towers is 500mm, and the height of the packing layer is 5m and 2m respectively. The vacuum degree of the tower kettle is controlled at about 10mmHg, and the falling film reboiler is heated. Feed from the first tower at a feed rate of 62.5kg / hr; extract light components from the top of the first tower; extract heavy components from the bottom of the second tower; and harvest 46.5kg / hr from the top of the second tower Ethyl vanillin was extracted at a high speed, with a purity of 99.5% and a yield of 90.2%. (see figure 1 )

Embodiment 2

[0028] The crude ethyl vanillin in Example 1 is separated and purified by the method of the present invention. The inner diameter of the rectification tower is 500mm, and the height of the packing is 5m. Install a 2.5m high divider in the tower to make the filler height of the public rectification section I 2m, the filler height of the public stripping section IV is 0.5m, the position of the feed inlet is set at the 2.5m height filler, and the side line The mining outlet position is set at the filling height of 1m. The vacuum degree of the control tower kettle is about 10mmHg, and the falling film reboiler is heated. Feed from the upper part of zone II at a feed rate of 62.5kg / hr; extract light components from the top of zone I; extract heavy components from the bottom of zone IV; extract from the middle and lower side lines of zone III at a rate of 49.1kg / hr Ethyl vanillin was obtained with a purity of 99.5% and a yield of 95.2%. (see figure 2 )

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
diameteraaaaaaaaaa
heightaaaaaaaaaa
heightaaaaaaaaaa
Login to view more

Abstract

The invention relates to a method and device for separating and purifying vanillin by comparting wall tower to reduce pressure and continuous distillation. A vertical wall which is arranged in the middle and lower part of a distillation tower divides the tower into four areas, which are area one, area two, area three and area four. The coarse ethyl vanillin waiting to be separated, is put in from the middle and upper part of the area two which mainly finishes the separation of ethyl vanillin from the heavy components; the area three is the area in which ethyl vanillin is separated from light components, and the pure components ethyl vanillin is obtained from the lateral line in the middle and lower part of the area three; the area one is the public distillation section of the area two and the area three, and the light components is obtained from the top of the area one; the area four is the public distillation section of the area two and the area three, and the heavy components is obtained from the bottom of the area four. The single column continuous distillation of coarse ethyl vanillin is realized and high-purity ethyl vanillin is obtained from the lateral line. The invention overcomes the disadvantages of the high demand for equipment in the molecular distillation, and high energy consumption and low yield in the double tower pressure reduction continuous distillation method, and has the advantages of 'low invest, low energy consumption, high yield and high purity', large spreading and applying value and high social and economical benefits.

Description

Technical field [0001] The invention relates to a method for rectifying, separating and purifying heat-sensitive substances, in particular to a method for separating and purifying ethyl vanillin under reduced pressure and continuous distillation in a dividing wall tower, which can realize continuous separation of target products in a single tower. Background technique [0002] Ethyl vanillin is a heat-sensitive substance. It is easy to polymerize when exposed to heat for a long time, which affects product quality and yield. The rectification yield generally does not exceed 90%. This is a common problem encountered in the separation and purification of high-boiling heat-sensitive materials. In order to solve this problem, it was proposed to use molecular distillation to separate ethyl vanillin (Chemical Engineering, Vol. 35, No. 10, Qian Shenghua, etc.), which increased the yield to about 93%-95%. Although this method improves the yield, it requires a very high degree of vacuum (4...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/575C07C45/82B01D3/14
Inventor 易宗明
Owner HUNAN ASTAR BIO CHEM TECH
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