Method for dewatering solvent during aromatic acid production process

A production process, a technology for aromatic acids, which is applied in the separation/purification of carboxylic acid compounds, the preparation of carboxylic acids by oxidation, organic chemistry, etc. It can solve the problems of affecting product quality, high energy consumption of azeotropic distillation process, and reduce steam consumption. , the effect of increasing production capacity and reducing load

Inactive Publication Date: 2017-02-15
SINOPEC YANGZI PETROCHEM +1
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to further reduce the energy consumption of the solvent dehydration process and the loss of the entrainer in the aromatic hydrocarbon production process, and reduce the impact of the decomposition of the entrainer on the quality of the aromatic hydrocarbon product, the present invention directly uses one of the reactants as the dilute acetic acid to concentrate the aromatic hydrocarbon The extraction agent and the entrainer of acetic acid dehyd

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 dewatering solvent during aromatic acid production process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] Take the production process of terephthalic acid (PTA) as an example. PTA uses p-xylene (PX) as a raw material to catalyze and oxidize each strand of acetic acid from the reaction system under a catalyst and a certain temperature and pressure to enter the solvent dehydration system.

[0029] Such as figure 1 As shown, the low-concentration acetic acid aqueous solution 1 from the oxidation reaction system has a flow rate of 5610kg / hr (containing acetic acid 26.92wt.%, water 72.90wt.%, PX 0.09wt.%, methyl acetate 0.09wt.%) enters the top of extraction tower T1 , 15895kg / hr (containing 0.01wt.% of acetic acid, 0.05wt.% of water, 95.40wt% of PX, 4.54wt.% of methyl acetate) solvent from the bottom of the extraction tower T1 Enter, countercurrent contact in the extraction tower T1, the top of the extraction tower T1 to obtain the extraction phase 3 is 18668kg / hr (containing 8.09wt.% of acetic acid, 6.96wt.% of water, PX 81.24wt.%, methyl acetate 3.7 wt. %), th...

Example Embodiment

[0031] Example 2

[0032] The low-concentration acetic acid aqueous solution 1 from the oxidation reaction system flows into the top of the extraction tower at a flow rate of 1700kg / hr (containing 20wt.% of acetic acid, 80wt.% of water), and 3564kg / hr (containing 0.01wt of acetic acid) from the azeotropic agent refining tower. %, water 0.05wt.%, PX95.40wt%, methyl acetate 4.54wt.%) enters from the bottom of the extraction tower, contacts in the extraction tower countercurrently, the top of the extraction tower obtains the extraction phase 4438kg / hr (containing acetic acid 1.83wt.%, water 2.97wt.%, PX 81.16wt.%, methyl acetate 3.69wt.%), the bottom of the extraction tower obtains a raffinate phase of 816kg / hr.

[0033] The extraction phase from the top of the extraction tower 4438kg / hr (containing acetic acid 1.83wt.%, water 2.97wt.%, PX 81.16wt.%, methyl acetate 3.69wt.%) and high-concentration acetic acid aqueous solution 34450kg from the oxidation reaction system / hr (70.10wt.% ...

Example Embodiment

[0034] Example 3

[0035] In the process of producing terephthalic acid with p-diethylbenzene (PDEB) as raw material, the low-concentration acetic acid aqueous solution 1 from the oxidation reaction system has a flow rate of 3910kg / h (containing 29.92wt.% of acetic acid and 69.82wt.% of water), and then enters the extraction process. At the top of tower T1, the flow rate of the extractant 14 returned to the extraction tower from the azeotropic agent refining tower T3 tower kettle is 12264kg / h (including PDEB 96.01wt.%), enters the bottom of the extraction tower T1, and contacts in the extraction tower T1 countercurrently The flow rate of the extraction phase 3 obtained from the top of the extraction tower T1 is 14250 kg / h (containing 6.29 wt.% of acetic acid, PDEB, 81.19 wt.%), and the flow rate of the raffinate phase 4 obtained from the top of the tower is 1924 kg / h.

[0036] The extraction phase 3 from the top of the extraction tower T1 and the high-concentration acetic acid aque...

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 discloses a method for dewatering a solvent during an aromatic acid production process. According to the present invention, an aromatic hydrocarbon for aromatic acid production is adopted as a solvent, the acetic acid in the acetic acid aqueous solution produced during the aromatic acid production process is recovered through an extraction-azeotropic coupling process, and the used equipment in the whole process comprises an extraction tower, an azeotropic rectification tower, an oil-water separation tank, an azeotropic agent refining tower, and a methyl acetate recovery tower; and with the method of the present invention, the load of the acetic acid azeotropic rectification tower can be effectively reduced and the steam consumption of the acetic acid azeotropic rectification tower can be reduced, and the PTA production capacity can be increased.

Description

technical field [0001] The invention relates to a method for solvent dehydration in the production process of aromatic carboxylic acid. Background technique [0002] The solvent dehydration system is an important unit in the production process of aromatic acids, which is used to recover the solvent acetic acid required for the oxidation reaction of aromatic hydrocarbons. At present, the azeotropic distillation process is commonly used in industry to recover acetic acid. With the improvement of the process, an acetic acid extraction device is introduced in the aromatic acid production process, and the dilute acetic acid produced in the oxidation system is extracted and separated from water with a solvent, and then added Acetic acid azeotropic distillation column to obtain acetic acid with higher purity. This can not only effectively reduce the load of the acetic acid azeotropic rectification tower, but also reduce the steam consumption of the acetic acid azeotropic rectifica...

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): C07C63/26C07C63/24C07C63/307C07C57/34C07C51/48C07C51/16C07C51/42
CPCC07C51/48C07C51/16C07C51/42C07C63/26C07C63/24C07C63/307C07C57/34
Inventor 刘宗健汪洋王保正任珉陈韶辉袁浩
Owner SINOPEC YANGZI PETROCHEM
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