CN214553492U - Bis (trichloromethyl) carbonate photochemical reaction device - Google Patents
Bis (trichloromethyl) carbonate photochemical reaction device Download PDFInfo
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- CN214553492U CN214553492U CN202023244742.9U CN202023244742U CN214553492U CN 214553492 U CN214553492 U CN 214553492U CN 202023244742 U CN202023244742 U CN 202023244742U CN 214553492 U CN214553492 U CN 214553492U
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Abstract
The utility model relates to a bis (trichloromethyl) carbonate photochemical reaction device, which comprises a reaction kettle, a gas-liquid separator, a first-stage absorption kettle and a second-stage absorption kettle, wherein the inlet of the gas-liquid separator is connected with the outlet of a return pipe of the reaction kettle, the upper part of the gas-liquid separator is provided with a gas outlet connected with the inlet of a separation gas pipe, the lower part of the gas-liquid separator is provided with a liquid outlet connected with the inlet of a separation liquid pipe, and the outlet of the separation liquid pipe is communicated with the reaction kettle; the upper portion of one-level absorption kettle is equipped with and is used for letting in the gas inlet of separation gas pipe, and the upper portion of second grade absorption kettle is equipped with the air inlet that is used for letting in second grade absorption kettle intake pipe, and second grade absorption kettle intake pipe is linked together with one-level absorption kettle outlet duct. The device can give full play to the characteristics of the bis (trichloromethyl) carbonate, so that the reaction participated by the solid phosgene can be operated safely and efficiently, and the pressure of subsequent waste gas treatment is reduced.
Description
Technical Field
The utility model belongs to the field of chemical industry equipment, concretely relates to two (trichloromethyl) carbonic acid ester photochemical reaction devices.
Background
Phosgene is an important chemical raw material and is widely applied to the fields of high polymer materials, household medicines, spices, dyes and the like, and the reaction with the participation of phosgene is generally called photochemical reaction. As phosgene is a highly toxic gas, the use, transportation and storage of phosgene are extremely dangerous, and various strict safety measures need to be adopted, so that catastrophic accidents can be caused by carelessness.
Bis (trichloromethyl) carbonate, also called solid phosgene, is a stable solid compound which can be stored hermetically at room temperature and decomposes only a trace amount of phosgene and liquid phosgene even at boiling, so that it is relatively safe for transportation, storage and use with respect to phosgene, and has various chemical reaction properties because of its molecular structure containing carbonyl, trichloromethyl and the like groups, so that it can be utilized for various reactions. However, in the reaction using bis (trichloromethyl) carbonate as a raw material, phosgene is still generated in the reaction gas, and the phosgene in the reaction gas cannot be removed only by a reflux device or an absorption kettle, and if industrial waste gas containing phosgene is not utilized, a large amount of waste is caused, and the environment is seriously affected.
Disclosure of Invention
The utility model aims to provide a bis (trichloromethyl) carbonate photochemical reaction device which can effectively recycle phosgene in production based on the prior art.
The technical scheme of the utility model as follows:
a bis (trichloromethyl) carbonate photochemical reaction device comprises
The reaction kettle is provided with a condensing pipe and a condenser at the upper part, and an outlet of the condenser is provided with a return pipe;
the inlet of the gas-liquid separator is connected with the outlet of the return pipe, the upper part of the gas-liquid separator is provided with a gas outlet connected with the inlet of the separation gas pipe, the lower part of the gas-liquid separator is provided with a liquid outlet connected with the inlet of the separation liquid pipe, and the outlet of the separation liquid pipe is communicated with the reaction kettle;
the primary absorption kettle is used for absorbing phosgene in reaction gas through a solvent introduced into the kettle, a gas inlet used for introducing the separation gas pipe is formed in the upper part of the primary absorption kettle, a gas outlet and solvent inlet is formed in the upper part of the primary absorption kettle, the gas outlet and solvent inlet is communicated with a gas outlet pipe and a solvent inlet pipe of the primary absorption kettle, a backflow port is formed in the lower part of the primary absorption kettle, the backflow port is connected with an inlet of a backflow pipe of the absorption kettle, and an outlet of the backflow pipe of the absorption kettle is communicated with the reaction kettle; and
and the secondary absorption kettle is used for secondarily absorbing phosgene in the reaction gas through a solvent in the kettle, the upper part of the secondary absorption kettle is provided with an air inlet for introducing an air inlet pipe of the secondary absorption kettle, and the air inlet pipe of the secondary absorption kettle is communicated with the air outlet pipe of the primary absorption kettle.
In the device, a stirrer for stirring in the kettle is arranged on the reaction kettle.
The device is provided with a glass tube sight glass I on a return tube.
The separation liquid pipe in the device comprises a section of U-shaped pipe, and a glass pipe sight glass II is arranged on the separation liquid pipe.
The device is provided with a glass tube sight glass III on a return pipe of the collecting kettle.
The gas inlet pipe of the secondary absorption kettle in the device is communicated with the separation gas pipe through a valve.
This device is equipped with the gas outlet that is connected with second grade absorption cauldron outlet duct on second grade absorption cauldron's upper portion, is equipped with the liquid outlet that is connected with second grade absorption cauldron discharging pipe in second grade absorption cauldron's bottom.
Adopt the technical scheme of the utility model, the advantage is as follows:
the utility model provides an in-process that photochemical reaction unit used di (trichloromethyl) carbonate to react can retrieve the phosgene that produces at any time in the reacting gas to with it backward flow to continue participating in the reaction in the reation kettle, after a small amount of phosgene in the gas after the absorption carries out resorption through second grade absorption kettle, only contains trace phosgene in the industrial waste gas, carries out innocent treatment in can discharging subsequent exhaust-gas treatment system. The device can give full play to the characteristics of the bis (trichloromethyl) carbonate, so that the reaction participated by the solid phosgene can be operated safely and efficiently, and the pressure of subsequent waste gas treatment is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure, 1-reaction kettle, 2-stirrer, 3-condenser pipe, 4-condenser, 5-reflux pipe, 6-glass tube sight glass I, 7-gas-liquid separator, 8-glass tube sight glass II, 9-separation liquid pipe, 10-separation gas pipe, 11-first-stage absorption kettle, 12-absorption kettle reflux pipe, 13-glass tube sight glass III, 14-solvent feed pipe, 15-first-stage absorption kettle gas outlet pipe, 16-second-stage absorption kettle gas inlet pipe, 17-second-stage absorption kettle, 18-second-stage absorption kettle gas outlet pipe and 19-second-stage absorption kettle discharge pipe.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention in any way.
The utility model discloses a two (trichloromethyl) carbonic ester photochemical reaction device includes reation kettle, vapour and liquid separator, one-level absorption cauldron and second grade absorption cauldron. Wherein the upper part of the reaction kettle is provided with a condensing pipe and a condenser, and the outlet of the condenser is provided with a return pipe. A stirrer for stirring in the reaction kettle is arranged on the reaction kettle.
The inlet of the gas-liquid separator is connected with the outlet of the return pipe, the upper part of the gas-liquid separator is provided with a gas outlet connected with the inlet of the separation gas pipe, the lower part of the gas-liquid separator is provided with a liquid outlet connected with the inlet of the separation liquid pipe, and the outlet of the separation liquid pipe is communicated with the reaction kettle; the reflux pipe is provided with a glass tube sight glass I for observation. The gas-liquid separator in the device can lead out uncondensed gas to a subsequent primary absorption kettle for treatment. The separation liquid pipe comprises a section of U-shaped pipe, and a glass tube sight glass II for observation is arranged on the separation liquid pipe.
The first-stage absorption kettle is used for absorbing phosgene in reaction gas through a solvent introduced into the kettle, a gas inlet used for introducing a separation gas pipe is formed in the upper portion of the first-stage absorption kettle, and the separation gas pipe needs to be introduced below the solvent in the first-stage absorption kettle during operation. The upper part of the first-stage absorption kettle is also provided with an air outlet and a solvent inlet, the air outlet and the solvent inlet are combined into a whole, and the air outlet and the solvent inlet can be separated in the actual production; the air outlet and solvent inlet is communicated with an air outlet pipe and a solvent inlet pipe of the first-stage absorption kettle. And the lower part of the first-stage absorption kettle is provided with a return port, the return port is connected with an inlet of a return pipe of the absorption kettle, and an outlet of the return pipe of the absorption kettle is communicated with the reaction kettle. A glass tube sight glass III for observation is arranged on the return pipe of the recycling kettle.
The second-stage absorption kettle is used for secondarily absorbing phosgene in reaction gas through a solvent in the kettle, an air inlet used for introducing an air inlet pipe of the second-stage absorption kettle is formed in the upper portion of the second-stage absorption kettle, and the air inlet pipe of the second-stage absorption kettle needs to be introduced below the solvent in the kettle during operation. The gas inlet pipe of the second-stage absorption kettle is communicated with the gas outlet pipe of the first-stage absorption kettle and used for guiding the gas treated by the first-stage absorption kettle, and the gas inlet pipe of the second-stage absorption kettle can be further communicated with the gas separation pipe through a valve and used for collecting phosgene in the gas after reaction.
The upper part of the second-stage absorption kettle is provided with a gas outlet connected with a gas outlet pipe of the second-stage absorption kettle, and the bottom of the second-stage absorption kettle is provided with a liquid outlet connected with a discharge pipe of the second-stage absorption kettle.
When the device is operated, di (trichloromethyl) carbonate, reaction solvent and other reaction raw materials are added through a feed inlet of the reaction kettle to carry out reaction. Stirring and condensation are started in the reaction process, after reaction gas passes through a condenser and a gas-liquid separator, liquid flows back to a reaction kettle for continuous reaction, the gas is guided into a primary absorption kettle through a separation gas pipe for absorption treatment, the absorbed liquid directly returns to the reaction kettle for reaction, the gas absorbed by the primary absorption kettle is further guided into a secondary absorption kettle for absorption treatment, the gas absorbed by the secondary absorption kettle is guided into a subsequent waste gas treatment system, and the liquid generated after the secondary absorption can be reserved for subsequent reaction. After the reaction is stopped, the gas left in the reaction device still contains phosgene and can be guided into the secondary absorption kettle for absorption treatment through the secondary absorption kettle gas inlet pipe communicated with the separation gas pipe, so that leakage is prevented.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (7)
1. A bis (trichloromethyl) carbonate photochemical reaction device, which is characterized by comprising
The reaction kettle is provided with a condensing pipe and a condenser at the upper part, and an outlet of the condenser is provided with a return pipe;
the inlet of the gas-liquid separator is connected with the outlet of the return pipe, the upper part of the gas-liquid separator is provided with a gas outlet connected with the inlet of the separation gas pipe, the lower part of the gas-liquid separator is provided with a liquid outlet connected with the inlet of the separation liquid pipe, and the outlet of the separation liquid pipe is communicated with the reaction kettle;
the primary absorption kettle is used for absorbing phosgene in reaction gas through a solvent introduced into the kettle, a gas inlet used for introducing the separation gas pipe is formed in the upper part of the primary absorption kettle, a gas outlet and solvent inlet is formed in the upper part of the primary absorption kettle, the gas outlet and solvent inlet is communicated with a gas outlet pipe and a solvent inlet pipe of the primary absorption kettle, a backflow port is formed in the lower part of the primary absorption kettle, the backflow port is connected with an inlet of a backflow pipe of the absorption kettle, and an outlet of the backflow pipe of the absorption kettle is communicated with the reaction kettle; and
and the secondary absorption kettle is used for secondarily absorbing phosgene in the reaction gas through a solvent in the kettle, the upper part of the secondary absorption kettle is provided with an air inlet for introducing an air inlet pipe of the secondary absorption kettle, and the air inlet pipe of the secondary absorption kettle is communicated with the air outlet pipe of the primary absorption kettle.
2. The apparatus for the photochemical reaction of a bis (trichloromethyl) carbonate as claimed in claim 1, wherein the reaction vessel is provided with a stirrer for stirring the inside of the reaction vessel.
3. The bis (trichloromethyl) carbonate photochemical reaction device according to claim 1, characterized in that a glass tube sight glass I is provided on the return tube.
4. The bis (trichloromethyl) carbonate photochemical reaction device according to claim 1, characterized in that the separation liquid pipe comprises a section of a U-shaped pipe, and a glass tube sight glass II is provided on the separation liquid pipe.
5. The bis (trichloromethyl) carbonate photochemical reaction device according to claim 1, characterized in that a glass tube sight glass III is provided on the absorption kettle return pipe.
6. The bis (trichloromethyl) carbonate photochemical reaction device according to claim 1, characterized in that the secondary absorption kettle gas inlet pipe is communicated with the separation gas pipe through a valve.
7. The apparatus for the photochemical reaction of bis (trichloromethyl) carbonate as set forth in claim 1, wherein the secondary absorption vessel has a gas outlet connected to the gas outlet pipe of the secondary absorption vessel at the upper part thereof, and a liquid outlet connected to the discharge pipe of the secondary absorption vessel at the bottom thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023244742.9U CN214553492U (en) | 2020-12-29 | 2020-12-29 | Bis (trichloromethyl) carbonate photochemical reaction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023244742.9U CN214553492U (en) | 2020-12-29 | 2020-12-29 | Bis (trichloromethyl) carbonate photochemical reaction device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214553492U true CN214553492U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023244742.9U Active CN214553492U (en) | 2020-12-29 | 2020-12-29 | Bis (trichloromethyl) carbonate photochemical reaction device |
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| Country | Link |
|---|---|
| CN (1) | CN214553492U (en) |
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- 2020-12-29 CN CN202023244742.9U patent/CN214553492U/en active Active
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