Supercharge Your Innovation With Domain-Expert AI Agents!

Method for treating terephthalic acid subjected to hydrorefining

A technology for terephthalic acid and hydrorefining, which is used in the separation/purification of carboxylic acid compounds, organic chemistry, etc., and can solve the problems of high moisture content in the filter cake and high energy consumption for drying

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the washing process, water is used as the washing liquid to cause a high moisture content of the filter cake, resulting in high energy consumption for subsequent drying

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 treating terephthalic acid subjected to hydrorefining
  • Method for treating terephthalic acid subjected to hydrorefining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The terephthalic acid (containing about 15% of residual mother liquor) from the centrifuge of the refining unit is added with a 0.5% sodium lauryl sulfate aqueous solution for beating and washing, and the washing temperature is 150 ° C. The weight ratio of the added amount of the alkyl sodium sulfate aqueous solution to the terephthalic acid is 1.2, and then the obtained slurry is filtered in a rotary vacuum filter, and the water content of the obtained filter cake is 6.5%. Dry the filter cake at 135°C, and after further dispersing, qualified purified terephthalic acid powder can be obtained.

[0010] In order to further test the influence of residual surfactant on the production of polyethylene terephthalate (PET) through esterification and polycondensation reaction of purified terephthalic acid and ethylene glycol, the obtained purified terephthalic acid was mixed with ethylene Glycol carries out esterification and polycondensation reaction successively, and esterific...

Embodiment 2-26

[0012] Except that the type of surfactant, the concentration of surfactant, and the amount of aqueous surfactant solution are different, other operating conditions are the same as in Example 1. The changes in operating conditions and the experimental results are shown in Table 1.

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 method for treating terephthalic acid subjected to hydrorefining, and mainly aims to solve the problem that terephthalic acid filter cakes subjected to hydrorefining are high in water ratio in the prior art. According to the method, the problem is well solved by adopting the technical scheme which is as follows: the method comprises the following steps of: washing a terephthalic acid material from a hydro-refining unit centrifugal separator by using liquid and filtering, wherein the liquid is an anionic type surfactant aqueous solution. The method can be used for industrial production of terephthalic acid.

Description

technical field [0001] The invention relates to a treatment method of hydrorefined terephthalic acid. Background technique [0002] Since the solubility of terephthalic acid in 100g of water is only 0.03g at 150°C, it is basically insoluble; while p-toluic acid is almost completely dissolved, so in the refining process of PTA production, the content of purified terephthalic acid P-toluic acid can be removed by physical methods of crystallization and separation by taking advantage of the different solubility of the two in water. In most of the current PTA production processes, the separation operation of the refining unit is usually pressure centrifugation at 150°C. The obtained terephthalic acid centrifuged material is re-pulped, dissolved and washed with water, and filtered and separated, and then the obtained filter cake enters the atmospheric pressure steam tube. Type rotary dryer for drying (Du Guangxu, Jiang Guoguang. Application analysis of filter press in PTA product...

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): C07C63/26C07C51/42
Inventor 朱庆才畅延青陈大伟
Owner CHINA PETROLEUM & CHEM CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com