Comprehensive recovery treatment process of aniline tar

A kind of technology for recovery and treatment of aniline tar, which is applied in tar processing, tar processing through chemical method, petroleum industry, etc. It can solve problems such as economic loss, air and environmental pollution, and unutilized resources.

Active Publication Date: 2021-07-16
WANHUA CHEM GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, aniline tar is mostly treated by incineration, but it will produce a large amount of nitrogen oxides, causing certain air and environmental pollution, and valuable components such as precious metal catalysts have not been utilized as resources, resulting in large economic losses

Method used

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  • Comprehensive recovery treatment process of aniline tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like figure 1 In the process flow diagram shown, acetic acid and toluene are used to configure the organic solvent according to the mass ratio of 1:500, and a rectification tower with a theoretical plate number of 62 is used to mix the organic solvent and aniline tar according to the mass ratio of 50:1 Mix, and enter the rectification tower from the 7th tray, and pass into hydrogen below the 62 trays of the rectification tower, and control the hydrogen feed rate to be 10wt% of the tar feed amount; A stream of water is fed into each tray, and the mass ratio of water and tar is controlled to be 1:2; The upper section of the rectification tower realizes the hydrocracking of heavy components such as tar, and the organic solvent-containing material is obtained at the top of the rectification tower; the lower section of the rectification tower realizes the hydrogenation of tar cracking products, and the The catalyst and cracked hydrogenation products are discharged from the ...

Embodiment 2

[0041] The recovery and treatment process of aniline tar described in this embodiment is the same as that of Example 1, the only difference being that the mass ratio of the organic solvent to the tar is controlled to be 70:1, wherein the organic solvent is formic acid and toluene according to the mass ratio 1:700 is configured, and the temperature of the distillation tower is controlled at 242°C, the reflux ratio is 2.5, and the other parameters and rectification parameters remain unchanged.

[0042] After the operation of the rectification tower is stable, the light component product containing the organic solvent discharged from the top of the tower is collected, and after it is separated into two phases, the separated water phase is returned to the rectification tower for replenishing water.

[0043] After the distillation tower device is running stably, the components discharged from the tower kettle are collected and separated by suction filtration to obtain solid precious...

Embodiment 3

[0046] The recovery and treatment process of aniline tar described in this embodiment is the same as in Example 1, the only difference being that a rectifying tower with 75 theoretical plates is used, and the mixture of organic solvent and tar is controlled from the 7th plate. Enter the rectification tower, pass hydrogen gas under the 75 trays of the rectification tower, pass a stream of water at the 42nd tray of the rectification tower, control the temperature of the tower kettle at 240 ° C, the reflux ratio of 2, and other parameters and rectification The parameters are unchanged.

[0047] After the operation of the rectification tower is stable, the light component product containing the organic solvent discharged from the top of the tower is collected, and after it is separated into two phases, the separated water phase is returned to the rectification tower for replenishing water.

[0048] After the device is running stably, the components discharged from the tower kettle...

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Abstract

The invention belongs to the technical field of comprehensive recovery and utilization of chemical wastes, and particularly relates to a comprehensive recovery treatment process of aniline tar in aniline production. According to the comprehensive recovery treatment process of aniline tar, aniline tar and an organic solvent at least containing organic acid are mixed and then introduced into a rectifying tower for hydrotreating, tar is subjected to cracking reaction to generate corresponding ketoamine and other micromolecular components in the upper section of the rectifying tower under the action of a catalyst and the organic solvent, the lower section of the rectifying tower realizes hydrogenation of tar cracking products, and generated alcohol amine and other components and the catalyst are discharged from the bottom of the rectifying tower together. According to the process disclosed by the invention, the tar is changed into micromolecular components through hydrocracking, so that high-economic-value products such as alkylol amine and the like are obtained, the toxic action of the tar on the activity of the catalyst is solved, the activity of the separated noble metal catalyst can be effectively recovered, and the separated noble metal catalyst can be returned to a device, so that the recycling of the catalyst is realized, and the comprehensive utilization benefit of the device is improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery and utilization of chemical waste, and in particular relates to a process for comprehensive recovery and treatment of aniline tar in aniline production, in particular to a process for the treatment of aniline tar and the recovery of catalysts. Background technique [0002] Aniline compounds are important chemical raw materials, widely used in the production of dye intermediates, pharmaceuticals, pesticides, rubber additives, antioxidants, and fine chemical intermediates. At present, industrialized aniline compounds are mainly prepared by reduction of nitro compounds. The main synthetic methods include metal reduction method, alkali sulfide reduction method, electrochemical reduction method and catalyst hydrogenation method, etc. Among them, catalyst hydrogenation method It has good industrial optimization, and has the advantages of simple reaction process, high selectivity and high ...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/80C07C35/08C07C209/86C07C211/35C10C1/20B01J8/00B01D3/00
CPCC07C29/76C07C29/80C07C209/86C10C1/205B01J8/0035B01D3/009C07C2601/14C07C35/08C07C211/35Y02P20/584
Inventor 李江吴雪峰刘俊李艳杰陆洋张宏科
Owner WANHUA CHEM GRP
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