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System and method for continuous removal of impurities from solvent benzene in a caprolactam extraction process

A technology of caprolactam and solvent benzene, which is applied in the field of recycling solvent benzene purification, can solve the problems of affecting the impurity removal effect of the refining process, impacting the quality of caprolactam finished products, and the rapid accumulation of circulating benzene impurities, so as to increase the effective separation time, reduce running loss, prolong The effect of the run cycle

Active Publication Date: 2020-04-28
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the current problem of improving the quality of caprolactam products and the rapid accumulation of circulating benzene impurities in the extraction and refining process of caprolactam, the low efficiency of impurity removal, the impact on the impurity removal effect of the rear refining process, and the final impact on the quality of caprolactam finished products. System and method for continuous removal of impurities from solvent benzene in a caprolactam extraction process

Method used

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  • System and method for continuous removal of impurities from solvent benzene in a caprolactam extraction process
  • System and method for continuous removal of impurities from solvent benzene in a caprolactam extraction process
  • System and method for continuous removal of impurities from solvent benzene in a caprolactam extraction process

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Experimental program
Comparison scheme
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Embodiment 1

[0043]A system for continuous removal of impurities from solvent benzene in a caprolactam extraction process, comprising a benzene decanter 1, the benzene decanter 1 is connected to the first static mixer 2 through a benzene delivery pump 7, the first static mixer The mixer 2 is connected with the second static mixer 3, and the second static mixer 3 is connected with the high-efficiency coalescer 4, and the high-efficiency coalescer 4 is connected with the benzene rectification tower 5 through the crude benzene delivery pump 9, so The high-efficiency coalescer 4 is also connected with the benzene stripper 6.

[0044] Preferably, the miscellaneous benzene decanter 1 is also connected to the benzene stripper 6 through the bottom liquid delivery pump 8, and the bottom of the high-efficiency coalescer 4 is also connected to the benzene stripper 6 through a pipeline,

[0045] Preferably, the bottom of the benzene rectification tower 5 is connected to the first waste liquid concentr...

Embodiment 2

[0071] The purity of benzene is 99.90%wt, the extinction value at 290nm is 0.5, and the amount of benzene to be treated is 50m 3 / h, implement according to the following condition table 1, other are the same as embodiment 1, the quality of purified benzene is shown in table 1.

[0072] Table 1

[0073]

[0074]

Embodiment 3

[0076] A method for continuous removal of impurities from solvent benzene in the caprolactam extraction process, the purity of the recycled solvent benzene extracted by extraction is 99.90%wt, the extinction value at 290nm is 0.5, and the amount of benzene treated is 50m 3 / h, implement according to the following condition table 2, other is the same as embodiment 1, and the quality of purified benzene is shown in table 2.

[0077] Table 2

[0078]

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Abstract

The invention relates to a system and a method of continuously removing impurities in solvent benzol in a caprolactam extraction process. The system comprises an impure benzene decanter which is connected to a first static mixer through an impure benzene delivery pump; the first static mixer is connected to a second static mixer; the second static mixer is connected to an efficient coalesce; the efficient coalescer is connected to a benzene rectifying tower through a coarse benzene delivery pump; and the efficient coalescer is also connected to a benzene stripping tower. The method comprises the following steps: separating heavy phases which are not dissolved in benzene in solvent benzol by means of decanting, initially separating free impurities in benzene and then feeding water-washed and alkaline-washed coalescer to remove a water phased; and feeding the separated benzene through the coalescer into the benzene rectifying tower for continuous rectification and impurity removal to remove recombinant impurities in benzene, and feeding the rectified and condensed benzene to a coarse caprolactam extraction section, wherein the extinction value of rectified benzene at 290nm is reduced from 0.25 to 0.1 or below, and the purity is greater than 99.98%.

Description

technical field [0001] The invention relates to the field of recycling solvent benzene purification, in particular to a system and method for continuous removal of impurities from solvent benzene in a caprolactam extraction process. Background technique [0002] Caprolactam is an important raw material for the production of nylon-6, engineering plastics, films and other chemical products, and the quality of caprolactam has a great impact on the quality of downstream products, especially high-speed spinning. A powerful means, in the pre-extraction section of the caprolactam production process. At present, the production of caprolactam adopts the traditional cyclohexanone oxime Beckmann rearrangement technology. Due to the introduction of impurities in raw materials and the control of intermediate processes, a large number of impurities that affect the quality of the finished caprolactam will be produced. In the refining process of caprolactam, benzene extraction of crude capr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D201/16C07D223/10
CPCC07D201/16C07D223/10
Inventor 周学军游华彬罗岩王海军尤进冬施江黎胡小华杨军唐瑞
Owner HUBEI SANNING CHEM