CN210409565U - Phosgene purification system - Google Patents
Phosgene purification system Download PDFInfo
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- CN210409565U CN210409565U CN201921129142.2U CN201921129142U CN210409565U CN 210409565 U CN210409565 U CN 210409565U CN 201921129142 U CN201921129142 U CN 201921129142U CN 210409565 U CN210409565 U CN 210409565U
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- phosgene
- tower
- purifying column
- packing layer
- condenser
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Abstract
The utility model relates to a phosgene clean system, including purifying column (1), its characterized in that: be equipped with two sections packing layers in purifying column (1), upper segment packing layer (2) and hypomere packing layer (3), be equipped with on purifying column (1) tower body between upper packing layer (2) and lower part packing layer (3) and retrieve phosgene intake pipe (4), the blast pipe and condenser (5) access connection at the purifying column (1) top of the tower, condenser (5) outlet pipe is connected with purifying column (1) top of the tower return current mouth, the blast pipe of condenser (5) connects to tail gas destruction system. The method has the advantages of improving the purity of phosgene used in the TDI production line, effectively reducing the influence of hydrogen chloride on the TDI synthesis reaction, improving the yield of TDI products, reducing the production of residues and reducing the pollution of waste residues to the environment, along with simple process and low investment.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry, concretely relates to phosgene clean system.
Background
Toluene diisocyanate, TDI for short, is a colorless to light yellow liquid, has strong pungent odor and toxicity, is dissolved in ether, acetone and some other organic solvents, and can be used for preparing synthetic fibers, foamed plastics, rubber, coatings, adhesives and the like. In the prior art, toluene diisocyanate is generally prepared by the reaction of toluene diamine and phosgenation: toluene diamine and excessive phosgene enter a reactor together, and the reaction is carried out in two steps to finally generate toluene diisocyanate and hydrogen chloride. The excessive phosgene is recycled by rectification, because hydrogen chloride gas is generated in the TDI synthesis reaction, part of hydrogen chloride gas which is not removed is carried in the phosgene, the molecular weight of the hydrogen chloride gas is low, the diffusivity is high, if the hydrogen chloride gas reacts with the phosgene, the hydrogen chloride gas reacts with toluenediamine to generate impurities in advance, the TDI yield is reduced, the TDI product yield is reduced, and the economic cost is increased.
Disclosure of Invention
The utility model aims at completely removing the hydrogen chloride gas impurity in the phosgene, improving the purity of the phosgene, providing a simple process, a little phosgene clean system of investment to solve the bottleneck problem in the former technology, finally reach the target of improving TDI product yield.
In order to achieve the purpose, the utility model adopts the technical proposal that: the phosgene purification system comprises a purification tower and is characterized in that: two sections of packing layers, an upper section packing layer and a lower section packing layer are arranged in the purification tower, a phosgene recovery air inlet pipe is arranged on a purification tower body between the upper section packing layer and the lower section packing layer, an exhaust pipe on the top of the purification tower is connected with an inlet of a condenser, an outlet pipe of the condenser is connected with a return port on the top of the purification tower, and the exhaust pipe of the condenser is connected to a tail gas destruction system.
The outer wall of the tower kettle of the purification tower is provided with a heat tracing coil, and the heat of the heat tracing coil is from the waste heat in the TDI production device; and a light exhaust pipe is arranged at the bottom of the tower kettle of the purification tower and is connected to the phosgene storage tank.
The principle of the utility model is that: utilize the difference of each component volatility in the liquid mixture, make the phosgene of retrieving get into the ordinary pressure district from the hyperbaric region-the utility model discloses phosgene clean system, make the mixed material boiling point reduce through the decompression, the material gasifies rapidly in the phosgene purifying column, isolate hydrogen chloride gas, it is clean in order to further get rid of hydrogen chloride gas, design both ends filler in the phosgene purifying column, separation efficiency is improved, for the energy saving, the tower cauldron does not design the reboiler, but continues the waste heat utilization in the TDI apparatus for producing, increase warm water coiler heat tracing at the outer wall of phosgene purifying column tower cauldron, provide the heat for the phosgene purifying column, finally reach the desorption with hydrogen chloride gas, purify the purpose of phosgene.
The utility model has the advantages that: the method has the advantages of improving the purity of phosgene used in the TDI production line, effectively reducing the influence of hydrogen chloride on the TDI synthesis reaction, improving the yield of TDI products, reducing the production quantity of residues, reducing the pollution of waste residues to the environment, reducing the cost for treating the waste residues, removing a large amount of hydrogen chloride gas from a system, absorbing the hydrogen chloride gas with water to generate hydrochloric acid to be sold as a product, and increasing the production yield of TDI.
Drawings
FIG. 1 is a schematic view of the present invention;
in the figure: 1-a purification tower, 2-an upper section packing layer, 3-a lower section packing layer, 4-a phosgene recovery air inlet pipe, 5-a condenser, 6-a heat tracing coil pipe and 7-a light exhaust pipe.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Example 1, see fig. 1, a phosgene purification system comprising a purification column 1, characterized in that: two sections of packing layers are arranged in the purification tower 1, an upper section packing layer 2 and a lower section packing layer 3 are arranged in the purification tower 1, a phosgene recovery air inlet pipe 4 is arranged on a tower body of the purification tower 1 between the upper section packing layer 2 and the lower section packing layer 3, an exhaust pipe at the top of the purification tower 1 is connected with an inlet of a condenser 5, an outlet pipe of the condenser 5 is connected with a reflux port at the top of the purification tower 1, and an exhaust pipe of the condenser 5 is connected. The outer wall of the tower kettle of the purification tower 1 is provided with a heat tracing coil pipe 6, the bottom of the tower kettle of the purification tower 1 is provided with a phosgene exhaust pipe 7, and the phosgene exhaust pipe 7 is connected to a phosgene storage tank.
The working process is as follows: recycled phosgene enters a purification tower 1 from a recycled phosgene inlet pipe 4, materials are quickly gasified in the tower, hydrogen chloride gas is separated, gas-phase HCl gas in the tower is discharged from the top of the tower and is sent to a condenser 5, cooling medium is connected into a tube array of the condenser 5 to cool down phosgene carried in the discharged gas and returns to the purification tower 1 as reflux, the gas discharged from the condenser 5 is connected to a tail gas destruction system, a large amount of liquid phosgene in the purification tower 1 enters a tower kettle from top to bottom, a heat tracing coil pipe 3 on the outer wall of the tower kettle heats the materials in the tower kettle to enable all hydrogen chloride gas contained in the phosgene to be removed, and the phosgene is discharged from the lower end of the tower kettle and is sent to a phosgene.
Claims (2)
1. A phosgene clean system, includes purifying column (1), its characterized in that: be equipped with two sections packing layers in purifying column (1), upper segment packing layer (2) and hypomere packing layer (3), be equipped with on purifying column (1) tower body between upper segment packing layer (2) and hypomere packing layer (3) and retrieve phosgene intake pipe (4), the blast pipe and condenser (5) access connection at the purifying column (1) top of the tower, condenser (5) outlet pipe and purifying column (1) top of the tower return current mouth are connected, the blast pipe of condenser (5) connects to tail gas destruction system.
2. The phosgene purification system of claim 1, wherein: the outer wall of the tower kettle of the purification tower (1) is provided with a heat tracing coil pipe (6), the bottom of the tower kettle of the purification tower (1) is provided with a light exhaust pipe (7), and the light exhaust pipe (7) is connected to a phosgene storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921129142.2U CN210409565U (en) | 2019-07-18 | 2019-07-18 | Phosgene purification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921129142.2U CN210409565U (en) | 2019-07-18 | 2019-07-18 | Phosgene purification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210409565U true CN210409565U (en) | 2020-04-28 |
Family
ID=70382288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921129142.2U Active CN210409565U (en) | 2019-07-18 | 2019-07-18 | Phosgene purification system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210409565U (en) |
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2019
- 2019-07-18 CN CN201921129142.2U patent/CN210409565U/en active Active
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