CN-224207975-U - Cyclohexanone ammoximation membrane filtration system

CN224207975UCN 224207975 UCN224207975 UCN 224207975UCN-224207975-U

Abstract

The cyclohexanone ammoximation membrane filtration system comprises a heterogeneous ammoximation reaction kettle and a cross-flow membrane filter, wherein the upper end and the lower end of the reaction kettle are communicated with the tube pass of the cross-flow membrane filter through a first pipeline, the shell pass of the cross-flow membrane filter is communicated with an extraction tower through a second pipeline, a kettle liquid circulating pump is arranged on the first pipeline, and a clear liquid discharging cut-off valve, a clear liquid flowmeter and a clear liquid regulating valve are arranged on the second pipeline. The utility model solves the problems of large clear liquid discharge amount, membrane pollution, membrane blockage and catalyst leakage and loss existing in the prior art.

Inventors

WEI TIANRONG
XU SIHONG
LI XIAOQIANG
WANG ZHENLIN
WAN JUN
FENG YUANYUAN

Assignees

湖北三宁化工股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250430

Claims (7)

1. A cyclohexanone ammoximation membrane filtration system is characterized by comprising a heterogeneous ammoximation reaction kettle and a cross-flow membrane filter, wherein the upper end and the lower end of the reaction kettle are communicated with the tube pass of the cross-flow membrane filter through a first pipeline, the shell pass of the cross-flow membrane filter is communicated with an extraction tower through a second pipeline, a kettle liquid circulating pump is arranged on the first pipeline, and a clear liquid discharging cut-off valve, a clear liquid flowmeter and a clear liquid regulating valve are arranged on the second pipeline.
2. The cyclohexanone ammoximation membrane filtration system of claim 1, further comprising a regeneration tank, wherein the regeneration tank is connected to one side of the tube side of the cross-flow membrane filter through a third pipeline, and a regeneration pump is arranged on the third pipeline.
3. The cyclohexanone ammoximation membrane filtration system of claim 1, wherein the second pipeline is communicated with a backflushing liquid source through a fourth pipeline, and a backflushing cut-off valve is arranged on the fourth pipeline.
4. A cyclohexanone ammoximation membrane filtration system according to claim 1 to 3, wherein a feed pressure gauge and a discharge pressure gauge are respectively arranged on the first pipeline and the second pipeline.
5. A cyclohexanone ammoximation membrane filtration system according to any one of claims 1 to 3, wherein a fifth pipeline is communicated with a first pipeline communicated with a tube side of a cross-flow membrane filter by a kettle liquid circulating pump, and a drain valve is arranged on the fifth pipeline.
6. A cyclohexanone ammoximation membrane filtration system according to any one of claims 1 to 3, wherein a jacket is arranged outside the reaction kettle, and the upper end and the lower end of the jacket are respectively communicated with an air inlet pipe and an air outlet pipe.
7. A cyclohexanone ammoximation membrane filtration system according to any one of claims 1 to 3, wherein the top of the reaction kettle is sequentially communicated with the condensing tank and the adsorption tank through a pressure reducing pipe, and a pressure reducing valve is arranged on the pressure reducing pipe.

Description

Cyclohexanone ammoximation membrane filtration system Technical Field The utility model relates to the field of chemical production, in particular to a membrane filtration system used in the process of cyclohexanone ammoximation for producing caprolactam. Background The cyclohexanone ammoximation reaction is an important process link for producing caprolactam, a homogeneous system with tertiary butanol as a solvent is mainly adopted at present, and after cyclohexanone oxime (oxime for short) generated by the reaction is mixed with tertiary butanol, water and the like, a catalyst is separated through a cross-flow membrane filter or a dead-end membrane tube filter, so that the subsequent treatment of a reaction solution is realized. However, the process has the defects of large clear liquid discharge amount, membrane pollution, membrane blockage, catalyst leakage, running loss and the like, and seriously affects the stable and safe operation of the device. Disclosure of utility model The utility model aims to provide a cyclohexanone ammoximation membrane filtration system which is used for solving the problems of large clear liquid discharge amount, membrane pollution, membrane blockage and catalyst leakage and loss in the prior art. In order to solve the problems, the technical scheme of the utility model is as follows: The cyclohexanone ammoximation membrane filtration system comprises a heterogeneous ammoximation reaction kettle and a cross-flow membrane filter, wherein the upper end and the lower end of the reaction kettle are communicated with the tube pass of the cross-flow membrane filter through a first pipeline, the shell pass of the cross-flow membrane filter is communicated with an extraction tower through a second pipeline, a kettle liquid circulating pump is arranged on the first pipeline, and a clear liquid discharging cut-off valve, a clear liquid flowmeter and a clear liquid regulating valve are arranged on the second pipeline. Further, the device also comprises a regeneration tank, wherein the regeneration tank is connected to one side of the tube side of the cross-flow membrane filter through a third pipeline, and a regeneration pump is arranged on the third pipeline. Further, the second pipeline is communicated with a backflushing liquid source through a fourth pipeline, and a backflushing cut-off valve is arranged on the fourth pipeline. Further, a feeding pressure gauge and a discharging pressure gauge are respectively arranged on the first pipeline and the second pipeline. Further, a fifth pipeline is communicated with a first pipeline of the kettle liquid circulating pump communicated with the tube side of the cross-flow membrane filter, and a drain valve is arranged on the fifth pipeline. Further, a jacket is arranged outside the reaction kettle, and the upper end and the lower end of the jacket are respectively communicated with an air inlet pipe and an air exhaust pipe. Furthermore, the top of the reaction kettle is communicated with the condensing tank through a decompression pipe, and a decompression valve is arranged on the decompression pipe. The beneficial effects of the utility model are as follows: 1. the cross-flow membrane filter can simultaneously meet the requirements of effluent and oxime production of a reaction system, thereby eliminating the existing cyclone separation and alkane oxime security filtration system, simplifying the process flow and equipment of the catalyst filtration system, and reducing the operation difficulty and the equipment investment cost. 2. The high-temperature hot water and the high Wen Woshui clear liquid are alternately used as the backflushing medium, and the high-pressure backflushing is maintained through the medium-pressure nitrogen, so that the backflushing effect is greatly improved, the running period of the cross-flow membrane filter is further prolonged, and the production stability is improved. Drawings The utility model is further described with reference to the accompanying drawings: Fig. 1 is a schematic structural view of the present utility model. In the figure, an adsorption tank 1, a condensation tank 2, a pressure reducing valve 3, a reaction kettle 4, a regeneration tank 5, a cross-flow membrane filter 6, a discharge pressure gauge 7, a clear liquid flowmeter 8, a kettle liquid circulating pump 9, a regeneration pump 10, a feed pressure gauge 11, a hot water tank 12, an oxime water clear liquid tank 13, an extraction tower 14, a blow-down valve 15 and a jacket 16 are shown. Detailed Description The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive ef