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Caprolactam extract washing tower, system and process

A caprolactam and extraction liquid technology, applied in the field of caprolactam extraction liquid washing towers, can solve the problems affecting extraction effect and product quality, high conductivity of caprolactam aqueous solution, equipment corrosion, etc., and achieves the effects of large load elasticity, reduced electrical conductivity, and reduced corrosion.

Active Publication Date: 2020-09-22
LIAOCHENG MEISI NEW MATERIAL TECH CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors of the present invention have found through production practice that the crude caprolactam obtained by neutralization and crystallization has higher inorganic salts and free acids, which seriously affects the extraction effect and product quality, and causes corrosion to equipment. The conductivity of the caprolactam aqueous solution after stripping is high rate

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  • Caprolactam extract washing tower, system and process

Examples

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Embodiment approach

[0030] The third embodiment of the present invention provides a caprolactam extract washing process. The caprolactam extract washing tower is provided, and the caprolactam solution after neutralization and crystallization is subjected to benzene extraction, and the caprolactam extract after benzene extraction enters the caprolactam extract for washing The tower is washed with water to obtain the washed caprolactam extract, and the washed caprolactam extract is back-extracted.

[0031] In some examples of this embodiment, the water feed pressure of the water phase feed distributor in the caprolactam extract washing tower is 0.5-0.6 Mpa.

[0032] In some examples of this embodiment, the volume ratio of the washing water in the caprolactam extract washing tower to the caprolactam extract is 0.01˜0.05:1. According to the characteristics of caprolactam, it is both soluble in water and soluble in benzene (the solubility in water is slightly greater than that of benzene), but in the ...

Embodiment 1

[0035] A caprolactam extract scrubber, such as figure 1 As shown, it includes a vertical tower body, and the tower body includes oil phase feed distributor 1, several sieve plates 2, random packing layer 3, water phase feed distributor 4, structured packing layer 5 and Wire mesh coalescer6.

[0036] The outlet of the oil phase feed distributor 1 is set upward, and the water outlet hole of the water phase feed distributor 4 is set downward. The water phase feed distributor 4 forms a "feng"-shaped structure by the main water pipe and the branch water pipe. The branch water pipe A number of water outlet holes with a diameter of 1-2mm are opened, the water phase outlet is installed at the bottom of the tower body, the online pH meter is installed at the water phase outlet, and the oil phase outlet is installed at the top of the tower body. 38# random saddle ring random packing is used in the random packing layer 3.

[0037] The caprolactam extraction liquid washing tower is inst...

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Abstract

The invention discloses a caprolactam extract washing tower, system and process. The washing tower comprises a tower body which is vertically arranged, wherein an oil-phase feeding distributor, a random packing layer, a water-phase feeding distributor and a structured packing layer are sequentially arranged in the tower body from bottom to top; a discharge port of the oil-phase feeding distributoris arranged upwards, water outlet holes of the water-phase feeding distributor are arranged downwards, the water-phase feeding distributor is of a structure shaped like a Chinese character'feng 'formed by a main water pipe and branch water pipes, a plurality of water outlet holes are formed in the branch water pipes, a water-phase outlet is formed in the bottom of the tower body, and an oil-phaseoutlet is formed in the top of the tower body. The washing tower can effectively remove inorganic salts and free acids in the caprolactam extract, reduce the conductivity of the caprolactam aqueous solution and improve the quality of the caprolactam product.

Description

technical field [0001] The invention relates to a caprolactam extraction liquid washing tower, system and process. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The traditional caprolactam refining process is to obtain a caprolactam aqueous solution with a lower conductivity (generally <30 μs / cm) after the crude caprolactam aqueous solution neutralized with ammonia water is subjected to benzene extraction and back extraction. In order to save energy and reduce consumption, most manufacturers of caprolactam adopt neutralization and crystallization process. The rearrangement liquid of the reaction unit reacts directly with gaseous ammonia to obtain crude caprolactam aq...

Claims

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Application Information

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IPC IPC(8): B01D11/04
CPCB01D11/0492
Inventor 蒋加新楚守宾付衍胜耿维绪肖杨张晓辉李国华
Owner LIAOCHENG MEISI NEW MATERIAL TECH CO LTD
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