Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for synthetic using oxidation residue of para-xylene

A technology of p-xylene and p-toluic acid, which is applied in the field of comprehensive utilization of p-xylene oxidation residues, can solve problems such as the exit of TA residues, achieve good economic benefits, improve utilization rates, and reduce production costs

Inactive Publication Date: 2006-07-05
中国石化集团天津石油化工公司
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention effectively solves the problem of comprehensive utilization of TA residues, has good adaptability to changes in the composition of TA residues, and solves the ever-existing problem of outlets for TA residues that plague PTA devices through rational utilization of TA residues, thereby making The PTA residue can be returned to the oxidation unit according to the original design, and the economic benefits are obvious. At the same time, it also solves the environmental pollution caused by the landfill and neutralization treatment of the TA residue, improves the utilization rate of resources, and effectively reduces the cost of the comprehensive utilization process of the TA residue. Has good economic benefits and certain social benefits

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 synthetic using oxidation residue of para-xylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 Vacuum drying and dehydration

[0054] Put 454.6Kg of TA residue (with a water content of 45%) into a vacuum drying oven, heat and evacuate, the temperature in the drying oven is controlled between 50-80°C, the vacuum is 680-720mmHg, and the drying time is 5- 6 hours. The water content of TA residue was reduced from 45% to below 3%.

Embodiment 2

[0055] Example 2 Azeotropic dehydration of monoalcohol.

[0056] Put 454.6Kg of TA residue (water content is 45%) into the kettle with water separator, add 300Kg of monohydric alcohol, heat until the temperature rises to 95-100°C, monohydric alcohol and water are azeotropically distilled out. Stratify in the device, emit the water of the lower layer, when the amount of emitted water reaches the theoretical value of 204Kg, the dehydration is completed.

Embodiment 3

[0057] Example 3 Esterification of TA residue

[0058] Add the catalyst tetrabutyl titanate 500g to the residue after the azeotropic dehydration of monohydric alcohol in Example 2 (or the dried TA residue in Example 1) for esterification, the esterification temperature is 160-250°C, and the reaction pressure is 0.3-0.6 Mpa, the phase separation temperature is 30-80°C, the monohydric alcohol and the reaction water are distilled out azeotropically, layered in the water separator, and the water in the lower layer is released until anhydrous is distilled out. The reaction water released is about 42Kg.

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
Acid valueaaaaaaaaaa
Login to View More

Abstract

The present invention discloses a method for comprehensively utilizing paraxylene oxidative residue. Said method includes the following steps: firstly, dehydrating paraxylene oxidative residue; making the dehydrated residue and monobasic alcohol undergo the process of esterification reaction under the action of catalyst; distilling or rectifying the esterification product to obtain recovered monobasic alcohol, monoester fraction, diester fraction and residue; rectifying and separating monoester fraction to obtain solvent A, high-purity benzoic acid monoester, high-purity p-methyl benzoic acid monoester and solvent B; making the high-purity benzoic acid monoester and high-purity p-methyl benzoic acid monoester undergo the process of catalytic hydrolysis reaction to obtain high-purity benzoic acid and high-purity p-methyl benzoic acid.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing oxidation residues. In particular, it relates to a method for comprehensively utilizing p-xylene oxidation residues. Background technique [0002] P-xylene oxidation residue (TA residue) is an organic compound containing a small amount of catalysts such as cobalt acetate and manganese acetate discharged from the terephthalic acid (PTA) plant in order to maintain the balance of system impurities. By-products, the main components are benzoic acid, p-toluic acid, isophthalic acid, terephthalic acid and other impurities, while containing the remainder of water. In recent years, with the rapid development of the polyester industry, the total industrial production of PTA has increased rapidly, resulting in a large amount of TA residues to be treated. In my country alone, 30,000-40,000 tons of TA residues are discharged every year. [0003] In my country, the waste residue produced by the PTA p...

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): B09B3/00
Inventor 齐彦伟吴俊华张志全司晓郡李洁
Owner 中国石化集团天津石油化工公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com