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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
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  • Abstract
  • Description
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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 dehydration are significantly different from the existing extraction-azeotropic process using esters as the extractant and the azeotropic distillation process using aromatic hydrocarbons as the entrainer. The present invention not only It solves the problem of extraction agent / azeotrope decomposition loss and product quality in the existing extraction-azeotropic process, and can also solve the problem of high energy consumption in the azeotropic distillation process

Method used

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  • Method for dewatering solvent during aromatic acid production process

Examples

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Embodiment 1

[0028] Taking the production process of terephthalic acid (PTA) as an example, PTA uses p-xylene (PX) as a raw material, and is catalytically oxidized under a catalyst and a certain temperature and pressure to prepare each strand of acetic acid aqueous solution from the reaction system and enter the solvent dehydration system.

[0029] Such as figure 1 Shown, the low concentration acetic acid aqueous solution 1 flow rate 5610kg / hr (containing acetic acid 26.92wt.%, water 72.90wt.%, PX 0.09wt.%, methyl acetate 0.09wt.%) from the oxidation reaction system enters the top of extraction tower T1 15895kg / hr (containing acetic acid 0.01wt.%, water 0.05wt.%, PX 95.40wt%, methyl acetate 4.54wt.%) solvent from the bottom of the extraction tower T1 in the T3 tower still of the entrainer refining tower Enter, countercurrent contact in the extraction tower T1, the extraction phase 3 obtained at the top of the extraction tower T1 is 18668kg / hr (containing acetic acid 8.09wt.%, water 6.96wt....

Embodiment 2

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

[0033] The extraction phase from the top of the extraction tower is 4438kg / hr (containing acetic acid 1.83wt.%, water 2.97wt.%, PX 81.16wt.%, methyl acetate 3.69wt.%) and 34450kg of high-concentration acetic acid aqueous solution from the oxidation reaction system / hr (containing 70.10wt.% of acetic acid, containing 29.46...

Embodiment 3

[0035] In the process of producing terephthalic acid with p-diethylbenzene (PDEB) as raw material, the flow of low-concentration acetic acid aqueous solution 1 from the oxidation reaction system is 3910kg / h (containing 29.92wt.% of acetic acid and 69.82wt.% of water), and enters the extraction At the top of the tower T1, the flow rate of the extraction agent 14 returning to the extraction tower from the tank of the entrainer refining tower T3 is 12264kg / h (containing PDEB 96.01wt.%), and enters the bottom of the extraction tower T1, and is contacted countercurrently in the extraction tower T1. The flow rate of the extract phase 3 obtained from the top of the extraction tower T1 is 14250 kg / h (containing 6.29 wt.% 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 aqueous solution 5 flow from the o...

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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

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Application Information

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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
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