A kind of separation method and separation system of trace benzene in vinyl acetate

A vinyl acetate and separation method technology, applied in the field of separation method and separation system of trace benzene in vinyl acetate, can solve the problems of small polarity difference, high technical difficulty, inapplicability, etc., achieve low raw material loss, The effect of simple process flow and simple structure optimization

Active Publication Date: 2018-10-02
CHINA PETROCHEMICAL CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high cost of cyclodextrins and their low specific selectivity to benzene
Therefore, this technology has not yet been industrialized, and the process of removing benzene is only a preliminary separation, which cannot meet the requirements of separating benzene at the ppm level
[0007] In addition, there is no literature report on the current research on the separation method suitable for trace amounts of benzene in vinyl acetate.
Exploratory studies have found that the difficulty of removing trace amounts of benzene in vinyl acetate is mainly due to the similar physical properties of vinyl acetate and benzene, such as boiling point: benzene 80.1°C, vinyl acetate 72.7°C, molecular size: benzene 0.65nm, vinyl acetate 0.52nm , and the difference in polarity between the two is small, conventional physical methods are not suitable for vinyl acetate-benzene system; and vinyl acetate is chemically active, and the structure of benzene is stable and difficult to undergo chemical reactions, so chemical reaction methods are not suitable for acetic acid Vinyl acetate-benzene system based on vinyl ester
At the same time, the difficulty of vinyl acetate debenzene technology is to further reduce the trace amount of benzene, which is already at the ppm level, to below 1PPm. The requirements for debenzene removal are high and the technology is difficult. The standard debenzene method can be followed

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
  • A kind of separation method and separation system of trace benzene in vinyl acetate
  • A kind of separation method and separation system of trace benzene in vinyl acetate
  • A kind of separation method and separation system of trace benzene in vinyl acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for separating trace amounts of benzene in vinyl acetate, the method adopts the structure as attached figure 1 The conventional production device shown is carried out, and the purity of its raw material vinyl acetate is 99.93wt%, and benzene content is 1.91PPm, and extractant adopts C 12 ~C 14The mixed alkanes, and the mass ratio of extractant and raw material vinyl acetate is 0.6, and the polymerization inhibitor p-benzoquinone that adds content to be 5PPm in raw material vinyl acetate; This raw material vinyl acetate enters through raw material vinyl acetate inlet pipe 1 The lower part of the extractive distillation tower 3, the extractant in the extractant storage tank 28 is sent to the upper part of the extractive distillation tower 3 through the solvent pump 30, the raw material vinyl acetate and the extractant are countercurrently contacted for mass transfer, the heating temperature in the extractive distillation tower 3 at 92°C, normal pressure, and a r...

Embodiment 2-7

[0041] Embodiment 2-7 is carried out by following materials, technique and parameter, and all the other settings are identical with embodiment 1:

[0042]

[0043]

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

No PUM Login to view more

Abstract

The invention relates to a separation method of trace benzene in vinyl acetate and a separation system for the separation method. One kind or a mixture of more kinds of alkane of which the carbon number is 10-18 is used as an extracting agent, and through extractive distillation, the trace benzene in the vinyl acetate is separated. The method can remove the trace benzene in the vinyl acetate, so that the content of benzene is reduced to 1PPm or below.

Description

technical field [0001] The invention relates to the technical field of chemical extraction, rectification and separation, in particular to a method for separating trace amounts of benzene in vinyl acetate and a separation system thereof. Background technique [0002] Vinyl acetate is an important chemical basic raw material, which is widely used in the production of chemical and chemical fiber products such as polyvinyl alcohol, coatings, adhesives, vinylon, and films. There are two main production methods of vinyl acetate: ethylene method and acetylene method. Due to the characteristics of the production process, there is a small amount of benzene in the synthesis of vinyl acetate by the acetylene method, and the content is about 2-10PPm. The existence of benzene affects its application in the fields of downstream chemical products such as medical treatment and food. For example, the new national standard requires that the benzene content of the water-based tobacco sizing...

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 Patents(China)
IPC IPC(8): C07C69/15C07C67/54B01D3/40
Inventor 赖先熔汪清泉黎园陈仕萍周海峰
Owner CHINA PETROCHEMICAL CORP
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