CN-121990634-A - Phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning

CN121990634ACN 121990634 ACN121990634 ACN 121990634ACN-121990634-A

Abstract

The invention belongs to the technical field of recycling treatment of waste liquid, and particularly relates to a phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning. The combined pipeline comprises a continuous S-shaped flow passage formed by alternately connecting vertical sections and horizontal sections, a heating system and a plurality of condensation recovery devices, wherein each condensation recovery device is respectively connected with the corresponding horizontal section. By adopting the S-shaped transpiration multi-section combined pipeline, the transpiration, separation and condensation are integrated, the space utilization rate is high, and the flow is continuous. The pneumatic device is arranged in the pipeline, so that gas flow conveying in a specific direction is realized, the conveying flow of the gas-fog mixture can be regulated, the heating efficiency is high, the phase separation process can be controlled more accurately through the combination of multi-stage gradient heating comprising external heating and inert gas mixing heating, and the DMSO and water separation efficiency and the product purity are effectively improved through the design of the condensation recovery device.

Inventors

LV JIANGUO
CAO WEIWEI
ZHU ANPING
ZHANG YE
SUN YONGLIAN

Assignees

东华能源(茂名)碳纤维有限公司

Dates

Publication Date: 20260508
Application Date: 20260224

Claims (10)

1. A phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning, which is characterized by comprising: the transpiration multi-section type combined pipeline comprises a continuous S-shaped flow passage formed by alternately connecting vertical sections and horizontal sections; The heating system is arranged at the vertical section of the transpiration multi-section type combined pipeline and is used for carrying out gradient heating on the aerosol mixture in the pipeline; The condensation recovery system comprises a plurality of condensation recovery devices which are matched with the number of the horizontal sections, and each condensation recovery device is connected with the corresponding horizontal section through a porous gas partition board; the inner part of the transpiration multi-section type combined pipeline is provided with a pneumatic device for driving the aerosol mixture to flow from bottom to top.
2. The phase separation and recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 1, wherein said pneumatic device comprises a plurality of built-in fan groups arranged on the inner wall of the transpiration multi-section combined pipeline.
3. The phase separation recovery device for the wastewater containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 1, wherein the condensation recovery device is of a tank tower structure, a plurality of layers of aerosol condensation baffles are arranged in the condensation recovery device, and the aerosol condensation baffles are connected with a liquid guiding pipeline.
4. The phase separation recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 1, wherein the condensation recovery device arranged on the most downstream horizontal stage is connected with DMSO collecting tank via liquid guiding-out pipeline, and the condensation recovery devices arranged on other horizontal stages are connected with water storage tank via liquid guiding-out pipeline.
5. The phase separation and recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 1, wherein said transpiration multi-stage combination pipeline comprises at least three vertical stages and at least three horizontal stages, said heating system comprises at least three stages of heating devices sequentially arranged along the flow direction of the aerosol, and said three stages of heating devices are respectively arranged on different vertical stages.
6. The phase separation and recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 5, wherein said at least three stages of heating means comprises a first stage heating means, a second stage heating means and a third stage heating means which are arranged in order along the flow direction of the aerosol.
7. The phase separation and recovery device for the wastewater containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 6, wherein the first-stage heating device is an external linear heating body which is wound on the outer wall of the initial vertical section of the transpiration multi-section combined pipeline; And/or the second-stage heating device and the third-stage heating device adopt high-temperature inert gas mixed heating devices.
8. The phase separation and recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 7, wherein the high-temperature inert gas mixing type heating device comprises an inert gas source pipeline and a gas injection pipe, the outlet end of the inert gas source pipeline stretches into the corresponding vertical section and then is connected with the gas injection pipe, and the injection direction of the gas injection pipe is the same as the flow direction of the gas fog.
9. The phase separation and recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 8, wherein the gas jet pipe is of L-shaped structure, and 3-5 groups of gas jet pipes are respectively arranged in the second-stage heating device and the third-stage heating device.
10. The phase separation and recovery device for waste water containing dimethyl sulfoxide for polyacrylonitrile spinning according to claim 5, wherein said transpiration multi-section combined pipeline comprises three vertical sections and three horizontal sections.

Description

Phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning Technical Field The invention belongs to the technical field of recycling treatment of waste liquid, and particularly relates to a phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning. Background In a Polyacrylonitrile (PAN) precursor wet spinning or dry-jet wet spinning process, dimethyl sulfoxide (DMSO) is widely used as a polymer solvent due to its excellent solubility and thermal stability. In the steps of dope preparation, spinning formation, and subsequent coagulation, washing, drawing, etc., a large amount of wastewater mixture containing DMSO at different concentrations is produced. The wastewater has complex components, has the characteristics of high COD, difficult biochemical degradation and the like, and can cause serious pollution to water and atmospheric environment if being directly discharged. Meanwhile, DMSO itself is used as a high-value solvent, and direct waste also causes obvious economic loss and resource waste. The existing treatment methods for the DMSO-containing wastewater mainly comprise an oxidation method, a membrane separation method and a rectification method. Although the oxidation method can degrade pollutants, DMSO cannot be recovered and secondary pollution is easy to generate, the membrane separation method is limited by the problems of the tolerance of a membrane material to DMSO and membrane pollution, high-concentration wastewater is difficult to treat, the purity of produced water is generally difficult to meet the recycling requirement, and the rectification method is a relatively wide method applied in industry at present and is used for separating and recovering by utilizing the boiling point difference of DMSO and water. However, due to the higher boiling point of DMSO (189 ℃) and the strong hydrogen bonding with water molecules, the conventional rectification process requires high heat input, resulting in huge energy consumption. In addition, under the high-temperature operation condition, DMSO has thermal decomposition risk, and malodor such as dimethyl sulfide and toxic byproducts can be generated, so that the subsequent treatment difficulty and the environmental protection risk are increased. The multistage rectifying tower equipment also has the problems of high investment cost, complex operation and maintenance, large occupied area and the like. Therefore, aiming at the urgent demands of DMSO-containing wastewater treatment and recycling recovery in the PAN spinning industry, development of a novel, efficient and energy-saving treatment device capable of realizing solvent recovery is needed to overcome the defects of the prior art and promote the green, low-carbon and cyclic development of the industry. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning, which realizes high-efficiency phase separation in the aerosol conveying process and recovery of dimethyl sulfoxide. In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the invention provides a phase separation recovery device for waste water containing dimethyl sulfoxide in polyacrylonitrile spinning, which comprises: the transpiration multi-section type combined pipeline comprises a continuous S-shaped flow passage formed by alternately connecting vertical sections and horizontal sections; The heating system is arranged at the vertical section of the transpiration multi-section type combined pipeline and is used for carrying out gradient heating on the aerosol mixture in the pipeline; The condensation recovery system comprises a plurality of condensation recovery devices which are matched with the number of the horizontal sections, and each condensation recovery device is connected with the corresponding horizontal section through a porous gas partition board; the inner part of the transpiration multi-section type combined pipeline is provided with a pneumatic device for driving the aerosol mixture to flow from bottom to top. Optionally, the pneumatic device comprises a plurality of built-in fan groups arranged on the inner wall of the transpiration multi-section combined pipeline. Optionally, the condensation recovery device is a tank tower structure, a plurality of layers of aerosol condensation partition plates are arranged in the condensation recovery device, and the aerosol condensation partition plates are connected with a liquid guiding pipeline. Optionally, the condensation recovery device arranged on the most downstream horizontal section is connected with the DMSO collecting tank through a liquid guiding-out pipeline, and the condensation recovery devices arranged on other horizontal sections are connected with the water storage tank through