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CN-224207423-U - Device for improving stability and purity of propylene carbonate device rectification product

CN224207423UCN 224207423 UCN224207423 UCN 224207423UCN-224207423-U

Abstract

The utility model provides equipment for improving stability and purity of propylene carbonate device rectification products, which relates to the technical field of propylene carbonate rectification and comprises a rear dehydrogenation tower, a front dehydrogenation tower, a heavy-duty removal tower and a synchronous processing device, wherein the synchronous processing device comprises silk screen structured packing fixedly connected inside the rear dehydrogenation tower and the front dehydrogenation tower, a water inlet pipe is fixedly connected to the top ends inside the rear dehydrogenation tower and the front dehydrogenation tower, a water distributing disc is fixedly connected to the output end of the water inlet pipe, and an air duct is fixedly connected inside the front dehydrogenation tower. And secondly, switching between series connection and parallel connection is realized through a switching valve, so that different production requirements are met. And the heat return pipe is used for recovering waste heat at the top of the tower, so that the steam consumption of the heavy-removal tower is reduced, and the filler of the heavy-removal tower is optimized and the pressure is controlled, thereby avoiding back mixing and polluting products.

Inventors

  • SUN CHENGJIAO
  • LI RUICHEN
  • WU ZHAOHAI

Assignees

  • 山东利兴新材料科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250530

Claims (6)

  1. 1. The equipment for improving the stability and purity of the propylene carbonate device rectification product comprises a rear dehydrogenation tower (1), a front dehydrogenation tower (2) and a weight removal tower (3), and is characterized by further comprising a synchronous processing device (4), wherein the synchronous processing device (4) comprises a silk screen structured packing (41) fixedly connected inside the rear dehydrogenation tower (1) and the front dehydrogenation tower (2), a water inlet pipe (42) is fixedly connected to the inner top ends of the rear dehydrogenation tower (1) and the front dehydrogenation tower (2), a water distribution disc (43) is fixedly connected to the output end of the water inlet pipe (42), an air duct (44) is fixedly connected to the inner part of the front dehydrogenation tower (2), and a switching valve (45) is fixedly connected to the top end of the air duct (44); the multistage condensation assembly (5), multistage condensation assembly (5) are including fixed connection in inside one-level condenser (51) of preceding dehydrogenation tower (2) and second grade condenser (52), the inside top fixedly connected with tertiary condenser (53) of back dehydrogenation tower (1).
  2. 2. The apparatus for improving the stability and purity of propylene carbonate apparatus rectification products of claim 1, wherein the top end of the on-off valve (45) is fixedly connected to the bottom end of the post dehydrogenation tower (1).
  3. 3. The apparatus for improving the stability and purity of propylene carbonate apparatus rectification products of claim 1, wherein the outside of the water diversion tray (43) is fixedly connected to the inner walls of the rear dehydrogenation tower (1) and the front dehydrogenation tower (2).
  4. 4. The device for improving the stability and purity of the propylene carbonate device rectification product according to claim 1, wherein the heat return pipes (6) are fixedly connected to the outer sides of the rear dehydrogenation tower (1) and the front dehydrogenation tower (2), and the other ends of the heat return pipes (6) are fixedly connected to the weight removing tower (3).
  5. 5. The device for improving the stability and purity of the propylene carbonate device rectification product according to claim 1, wherein the outer sides of the rear dehydrogenation tower (1) and the front dehydrogenation tower (2) are fixedly connected with mounting rings (7).
  6. 6. The device for improving the stability and purity of the propylene carbonate device rectification product according to claim 1, wherein the air inlet pipes (8) are fixedly connected to the outer bottom ends of the rear dehydrogenation tower (1) and the front dehydrogenation tower (2), and the air outlet pipes (9) are fixedly connected to the outer top ends of the rear dehydrogenation tower (1) and the front dehydrogenation tower (2).

Description

Device for improving stability and purity of propylene carbonate device rectification product Technical Field The utility model relates to the technical field of propylene carbonate rectification, in particular to equipment for improving stability and purity of a propylene carbonate device rectification product. Background Propylene carbonate is used as a key solvent in the fields of lithium battery electrolyte, high polymer materials and gas separation, and a traditional propylene carbonate rectification device generally adopts a single-tower or double-tower continuous rectification process and comprises a tower body, tower plates, a reboiler, a condenser and other components; The raw materials are fed from the middle part of the tower body, the light components are condensed by a tower top condenser and then partially refluxed, part of the light components are taken as the tower top, the heavy components are heated by a tower bottom reboiler and then partially vaporized, part of the heavy components are taken as the tower bottom residual liquid and discharged, and the target products are taken from a side line or a specific position of the tower bottom; However, in practical application, the single tower is adopted in the partial propylene carbonate rectification device, so that when high-purity separation is performed, the reflux ratio needs to be greatly improved, the treatment capacity is reduced, when high yield is pursued, the purity of the product is difficult to ensure, and the dual requirements of yield and purity cannot be flexibly met under different production scenes. The utility model provides equipment for improving the stability and purity of a propylene carbonate device rectification product. Disclosure of utility model The utility model aims to solve the defects in the prior art and provides equipment for improving the stability and purity of a propylene carbonate device rectification product. In order to achieve the aim, the equipment for improving the stability and purity of the propylene carbonate device rectifying product comprises a rear dehydrogenation tower, a front dehydrogenation tower, a heavy-duty removal tower and a synchronous processing device, wherein the synchronous processing device comprises silk screen structured packing fixedly connected inside the rear dehydrogenation tower and the front dehydrogenation tower, a water inlet pipe is fixedly connected to the inner top ends of the rear dehydrogenation tower and the front dehydrogenation tower, a water distribution disc is fixedly connected to the output end of the water inlet pipe, an air duct is fixedly connected inside the front dehydrogenation tower, and a switching valve is fixedly connected to the top end of the air duct; The multistage condensation assembly comprises a first-stage condenser and a second-stage condenser which are fixedly connected inside the front dehydrogenation tower, and a third-stage condenser is fixedly connected to the inner top end of the rear dehydrogenation tower. As a preferred embodiment, the top end of the on-off valve is fixedly connected to the bottom end of the post dehydrogenation tower. As a preferred embodiment, the outside of the water dividing tray is fixedly connected to the inner walls of the rear dehydrogenation tower and the front dehydrogenation tower. As a preferable implementation mode, the outer sides of the rear dehydrogenation tower and the front dehydrogenation tower are fixedly connected with a heat return pipe, and the other end of the heat return pipe is fixedly connected to the weight removing tower. As a preferable implementation mode, the outer sides of the rear dehydrogenation tower and the front dehydrogenation tower are fixedly connected with mounting rings. As a preferred implementation mode, the outside bottom ends of the rear dehydrogenation tower and the front dehydrogenation tower are fixedly connected with air inlet pipes, and the outside top ends of the rear dehydrogenation tower and the front dehydrogenation tower are fixedly connected with air outlet pipes. Compared with the prior art, the utility model has the advantages and positive effects that: According to the utility model, raw material gas enters the bottoms of the rear dehydrogenation tower and the front dehydrogenation tower from an air inlet pipe, the gas-liquid contact area is increased through the honeycomb structure of the silk screen structured packing in the rising process, the light components are primarily separated, and the water distributing disc at the top of the tower evenly sprays liquid through the water inlet pipe, so that the shower effect enhanced gas-liquid mass transfer is formed. The series and parallel modes can be switched through the linkage of the air duct and the switch valve, the heat return pipe at the top of the rear dehydrogenation tower and the front dehydrogenation tower can convey high-temperature steam to the heavy component removal tower to preheat feed liquid