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A kind of toluoxime solution washing device and method

A toluoxime and solution technology, which is applied to the field of devices for washing toluoxime solution, can solve the problems of increased difficulty in removing impurities in a rear rectification system, low quality of finished cyclohexanone oxime, limited ability to remove impurities, and the like. The effect of reducing wastewater treatment load, low cost, and lowering production cost

Active Publication Date: 2017-10-13
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this process is that the amount of washing water is large, and the ability to remove impurities in the toluene phase is limited, and the removal efficiency of some components such as cyclohexanone and cyclohexanol is low, which will increase the difficulty of removing impurities in the rear rectification system , the quality of the finished cyclohexanone oxime is not high

Method used

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  • A kind of toluoxime solution washing device and method

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Embodiment 1

[0026] A toluene oxime solution washing device, comprising a water washing separator 1 and a scrubber 3, one end of the water washing separator 1 is connected to the feed pump 2 through a line pipeline and then connected to the washer 3, and the upper part of the washer 3 is connected to the coalescence pump through the line pipeline The coalescer 4 is connected to the toluene oxime storage tank 5 through the line pipeline, and the line pipeline at the bottom of the scrubber 3 merges with the line pipeline at the bottom of the coalescer 4 before being connected to the waste water treatment device.

[0027] The other end of the water-washing separator 1 is connected to the mixer 6 through the line pipeline, and the front end of the mixer 6 is provided with a desalted water delivery pipe and a toluene oxime solution delivery pipe, and the desalted water delivery pipe and the toluene oxime solution delivery pipe are merged with Mixer connection. A desalinated water flow meter 7 a...

Embodiment 2

[0030] A process for washing with toluene oxime solution. The toluene oxime solution and desalted water are mixed uniformly through a mixer 6 in a certain ratio and then enter the washing separator 1. The washing separator 1 is connected to the feed pump 2, and the feed pump 2 is connected to the washing machine. The bottom of the device 3 is connected through a feeding pipe, the top of the scrubber 3 is connected with the coalescer 4 through a feeding pipe, and the coalescer 4 is connected with the toluoxime storage tank 5 through a feeding pipe.

[0031] Wherein the washing liquid is the heavy phase and enters from the upper part of the scrubber 3, and the toluene oxime solution is the light phase and enters from the lower part of the scrubber 3, and the washing liquid and the toluene oxime are countercurrently contacted and mass-transferred in the scrubber 3 under a certain ratio to remove the toluene oxime. Impurities, waste water in the scrubber 3 and coalescer 4 are conne...

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Abstract

The invention provides a toluene oxime solution washing device and method, including a water washing separator and a scrubber, one end of the water washing separator is connected to a feed pump through a line pipeline and then connected to the washer, and the upper part of the washer is connected to a coalescer through a line pipeline Connection, the coalescer is connected to the toluene oxime storage tank through the pipeline, and the pipeline at the bottom of the scrubber merges with the pipeline at the bottom of the coalescer before connecting to the wastewater treatment device. Using cheap and easy-to-obtain raw materials such as desalted water and sodium hydroxide solution, the cost is low; after adding a scrubber, the amount of desalted water used in the initial washing can be greatly reduced, reducing production costs, and at the same time reducing the load of wastewater treatment; after alkaline washing by the scrubber The toluene oxime solution has low impurity content, which can effectively improve the quality of the finished cyclohexanone oxime.

Description

technical field [0001] The invention relates to a device for washing the toluene oxime solution in the ammoximation process of cyclohexanone. Background technique [0002] Cyclohexanone oxime is an important intermediate product in the production of caprolactam. It is generally prepared by cyclohexanone ammoximation method, and then purified and separated by solvent recovery, toluene extraction, water washing, and toluene oxime. 5 0 H. [0003] The traditional toluene oxime water washing unit is to carry out circulating water washing in the water washing separator to remove soluble inorganic and organic impurities in the toluene phase and reduce the conductivity of the toluene phase; the water phase enters the wastewater treatment after secondary extraction of part of the oxime by the extraction tower. The disadvantage of this process is that the amount of washing water is large, and the ability to remove impurities in the toluene phase is limited, and the removal efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C249/14C07C251/44
Inventor 李万清游华彬车小军李军万军
Owner HUBEI SANNING CHEM