CN217988396U - Safety interlock system for 1-chloro-1, 1-difluoroethane production system - Google Patents
Safety interlock system for 1-chloro-1, 1-difluoroethane production system Download PDFInfo
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- CN217988396U CN217988396U CN202221930903.6U CN202221930903U CN217988396U CN 217988396 U CN217988396 U CN 217988396U CN 202221930903 U CN202221930903 U CN 202221930903U CN 217988396 U CN217988396 U CN 217988396U
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Abstract
The utility model discloses a safety interlock system for 1-chlorine-1, 1-difluoroethane production system, which belongs to the technical field of 1-chlorine-1, 1-difluoroethane production. The technical scheme is as follows: the gas return tower is provided with a temperature sensor and a pressure sensor, a feed pipe line is provided with a feed valve, a discharge pipe line is provided with a discharge valve, and a steam feed pipe line is provided with a steam feed valve; and the temperature sensor, the pressure sensor, the feed valve, the discharge valve and the steam feed valve are respectively electrically connected with a control system of the dispersion instrument. The utility model discloses set up corresponding instrumentation and valve at 1-chlorine-1, 1-difluoroethane (R142 b) return-air tower, adopt dispersion instrument control system (DCS system) to constitute interlocking loop, realize the safety interlock of return-air tower, make whole process systems be in safe state.
Description
Technical Field
The utility model relates to the technical field of 1-chloro-1, 1-difluoroethane production, in particular to a safety interlock system for a 1-chloro-1, 1-difluoroethane production system.
Background
In the step of preparing 1-chloro-1, 1-difluoroethane (R142 b) by a photochlorination method of chlorine and 1, 1-difluoroethane (R152 a), the product is obtained through the steps of raw material gasification, mixing, photochlorination, falling film absorption, water-alkali washing, freeze drying, compression condensation and product refining.
1) And (3) photo-chlorination reaction: liquid chlorine from a liquid chlorine plant and 1, 1-difluoroethane (R152 a) from a tank area respectively enter a gasifier, are gasified and then respectively enter a mixer after being metered by a flow meter through a buffer tank. R152a and chlorine are mixed in a mixer according to a ratio, the mixed materials respectively enter each group of photo-chlorination reactors (the photo-chlorination reactors are connected in series in pairs to form 1 group), mixed gas enters from the bottom of one-stage photo-chlorination reactor, the top of the mixed gas is discharged to enter the bottom of the next-stage photo-chlorination reactor, and crude gas after reaction is discharged from the top of the second-stage photo-chlorination reactor. The crude products after reaction in each group of the photochlorination reactors are mixed in a main pipe.
2) Falling film absorption, water alkali washing, freeze drying, compression and condensation: the mixed crude gas from the outlet of the photochlorination reactor is absorbed by a first-stage falling film, and the absorbed hydrogen chloride is prepared into hydrochloric acid which is conveyed to a tank area by a pump for storage. And (3) carrying out two-stage water washing treatment on the crude gas to remove residual hydrogen chloride, carrying out three-stage alkali washing treatment to remove chlorine, removing a small amount of gaseous water by a freeze dehydrator and an alkali fixing dryer, conveying the gaseous water into a gas buffering tank, and conveying a sodium hypochlorite solution formed by alkali washing to a tank area by a pump. And (3) compressing the crude product entering the buffer tank by a compressor, condensing the compressed gas by a crude product condenser, collecting the condensed material in a crude product buffer tank, and drying the condensed material by a crude product pump through a silica gel dryer to enter a product refining process.
3) And (3) refining a product: the product refining is mainly completed by a gas return tower, a first refining tower and a second refining tower. The crude product enters a gas return tower, light components R152a are removed from the top of the tower for recycling, tower kettle materials enter a first fine tower, a small amount of R152a and part of R142b removed from the top of the first fine tower enter a buffer tank, the tower kettle materials enter a second fine tower, high-boiling-point substances flow out from the bottom of the second fine tower, gas phase at the top of the second fine tower is condensed to obtain R142b products, one part of the gas phase flows back to be used for controlling the temperature at the top of the tower, and the other part of the gas phase is dried by a molecular sieve and then enters an R142b intermediate tank and finally pumped to a tank area by a pump for storage.
The reaction equation of the photochlorination method is as follows:
the main reaction equation:
Cl 2 +CH 3 CHF 2 →CH 3 CF 2 Cl+HCl
side reaction equation:
Cl 2 +CH 3 CHF 2 →CH 2 FCHFCl+HCl
2Cl 2 +CH 3 CHF 2 →CH 2 ClCF 2 Cl+2HCl
3Cl 2 +CH 3 CHF 2 →CHCl 2 CF 2 Cl+3HCl
4Cl 2 +CH 3 CHF 2 →CCl 3 CF 2 Cl+4HCl。
in the product refining system, the temperature and pressure requirements of the gas return tower are strict, and if the gas return tower generates an over-temperature and over-pressure condition, material leakage may be caused, and the consequences of personnel injury, property loss, environmental pollution and the like are caused.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the safety interlock system for the 1-chloro-1, 1-difluoroethane production system is characterized in that a corresponding detection instrument and a valve are arranged on a 1-chloro-1, 1-difluoroethane (R142 b) gas return tower, and a Distributed Control System (DCS) is adopted to form an interlock loop, so that the safety interlock of the gas return tower is realized, and the whole process system is in a safe state.
The technical scheme of the utility model is that:
the safety interlocking system is used for a 1-chloro-1, 1-difluoroethane production system, the 1-chloro-1, 1-difluoroethane production system comprises a gas return tower, the gas return tower is provided with a feeding pipeline, a discharging pipeline, an exhaust pipeline and a venting pipeline, the feeding pipeline is connected with a silica gel dryer, and the discharging pipeline is connected with a fine tower; the gas return tower is connected with a gas return tower reboiler, and a steam feeding pipeline and a steam condensate discharging pipeline are arranged on the gas return tower reboiler; the gas return tower is provided with a temperature sensor and a pressure sensor, a feed pipe line is provided with a feed valve, a discharge pipe line is provided with a discharge valve, and a steam feed pipe line is provided with a steam feed valve; and the temperature sensor, the pressure sensor, the feed valve, the discharge valve and the steam feed valve are respectively electrically connected with a control system of the dispersion instrument.
Preferably, the exhaust line is connected with a gas purification tower and a gas buffering tank.
Preferably, the pressure sensor is installed at the top of the air return tower.
Preferably, the feed line is connected to the middle of the gas return column.
Preferably, the discharge line is connected to the bottom of the gas return column.
Preferably, the vent line and the vent line are connected to the top of the gas return tower.
Compared with the prior art, the utility model, following beneficial effect has:
the utility model discloses set up corresponding detecting instrument and valve at 1-chlorine-1, 1-difluoroethane (R142 b) return-air tower, adopt dispersion instrument control system (DCS system) to constitute interlocking loop, realize the safety interlock of return-air tower, make whole process systems be in safe state, avoided leaking because of the material that the excessive temperature superpressure leads to, cause consequences such as personnel's injury, loss of property, environmental pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1, a gas return tower; 2. a feed line; 3. a discharge line; 4. an exhaust line; 5. an emptying pipeline; 6. a silica gel dryer; 7. a fine tower; 8. a gas return tower reboiler; 9. a steam feed line; 10. a vapor condensate discharge line; 11. a temperature sensor; 12. a pressure sensor; 13. a feed valve; 14. a discharge valve; 15. a steam feed valve; 16. a gas purification tower; 17. a buffer tank.
Detailed Description
In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
As shown in fig. 1, the utility model provides a safety interlock system for 1-chlorine-1, 1-difluoroethane production system, the 1-chlorine-1, 1-difluoroethane production system comprises a gas return tower 1, the gas return tower 1 is provided with a feeding pipeline 2, a discharging pipeline 3, a discharging pipeline 4 and a venting pipeline 5, the feeding pipeline 2 is connected with a silica gel dryer 6, and the discharging pipeline 3 is connected with a rectifying tower 7; the gas return tower 1 is connected with a gas return tower reboiler 8, and the gas return tower reboiler 8 is provided with a steam feeding pipeline 9 and a steam condensate discharging pipeline 10; the gas return tower 1 is provided with a temperature sensor 11 and a pressure sensor 12, a feed valve 13 is arranged on the feed pipeline 2, a discharge valve 14 is arranged on the discharge pipeline 3, and a steam feed valve 15 is arranged on the steam feed pipeline 9; the temperature sensor 11, the pressure sensor 12, the feed valve 13, the discharge valve 14 and the steam feed valve 15 are respectively and electrically connected with a decentralized instrument control system (namely a DCS).
Preferably, a purge tower 16 and a buffer tank 17 are connected to the exhaust line 4.
Preferably, the pressure sensor 12 is installed at the top of the gas return tower 1.
Preferably, the feed line 2 is connected in the middle of the gas return column 1.
Preferably, the discharge line 3 is connected to the bottom of the gas return column 1.
Preferably, the vent line 4 and vent line 5 are connected at the top of the gas return column 1.
The working principle is as follows:
the high limit value and the high limit value of the temperature sensor 11 and the pressure sensor 12 are preset in the DCS, the temperature sensor 11 feeds back the temperature information of the gas return tower 1 to the DCS in real time, and the pressure sensor 12 feeds back the pressure information of the gas return tower 1 to the DCS in real time. When the temperature or the pressure of the gas return tower 1 exceeds a high limit value, the DCS sends out an overrun alarm. When the temperature or the pressure of the gas return tower 1 exceeds a high-limit value, triggering interlocking, closing a feed valve 13 of the gas return tower 1 by the DCS system interlocking, and cutting off the feed of the gas return tower 1; the discharge valve 14 at the bottom of the tower kettle is closed in an interlocking manner, the discharge at the bottom of the tower kettle is cut off, the steam feed valve 15 of the gas return tower reboiler 8 is closed in a parallel locking manner, and the steam heating is cut off.
The utility model discloses set up corresponding detecting instrument and valve at 1-chlorine-1, 1-difluoroethane (R142 b) return-air tower 1, adopt dispersion instrument control system (DCS system) to constitute interlocking loop, realize the safety interlock of return-air tower 1, make whole process systems be in safe state, avoided leaking because of the material that the super-temperature superpressure leads to, cause consequences such as personnel's injury, loss of property, environmental pollution.
Although the present invention has been described in detail by referring to the accompanying drawings, the present invention is not limited thereto.
Claims (6)
1. The safety interlock system for the 1-chloro-1, 1-difluoroethane production system comprises a gas return tower (1), wherein the gas return tower (1) is provided with a feeding pipeline (2), a discharging pipeline (3), a gas exhaust pipeline (4) and a venting pipeline (5), the feeding pipeline (2) is connected with a silica gel dryer (6), and the discharging pipeline (3) is connected with a rectifying tower (7); the gas return tower (1) is connected with a gas return tower reboiler (8), and the gas return tower reboiler (8) is provided with a steam feeding pipeline (9) and a steam condensate discharging pipeline (10); the device is characterized in that a temperature sensor (11) and a pressure sensor (12) are installed on the gas return tower (1), a feed valve (13) is arranged on the feed pipeline (2), a discharge valve (14) is arranged on the discharge pipeline (3), and a steam feed valve (15) is arranged on the steam feed pipeline (9); the temperature sensor (11), the pressure sensor (12), the feed valve (13), the discharge valve (14) and the steam feed valve (15) are respectively electrically connected with a control system of the dispersion instrument.
2. A safety interlock system for a 1-chloro-1, 1-difluoroethane production system according to claim 1, characterized in that a purge column (16) and a buffer tank (17) are connected to the exhaust line (4).
3. The safety interlock system for 1-chloro-1, 1-difluoroethane production system according to claim 1, wherein the pressure sensor (12) is installed at the top of the gas return column (1).
4. The safety interlock system for 1-chloro-1, 1-difluoroethane production system according to claim 1, characterized in that the feed line (2) is connected in the middle of the gas return column (1).
5. The safety interlock system for 1-chloro-1, 1-difluoroethane production system according to claim 1, characterized in that the discharge line (3) is connected to the bottom of the gas return column (1).
6. The safety interlock system for 1-chloro-1, 1-difluoroethane production system according to claim 1, characterized in that the vent line (4) and the blow-down line (5) are connected at the top of the gas return column (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221930903.6U CN217988396U (en) | 2022-07-25 | 2022-07-25 | Safety interlock system for 1-chloro-1, 1-difluoroethane production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221930903.6U CN217988396U (en) | 2022-07-25 | 2022-07-25 | Safety interlock system for 1-chloro-1, 1-difluoroethane production system |
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| Publication Number | Publication Date |
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| CN217988396U true CN217988396U (en) | 2022-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221930903.6U Active CN217988396U (en) | 2022-07-25 | 2022-07-25 | Safety interlock system for 1-chloro-1, 1-difluoroethane production system |
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| CN (1) | CN217988396U (en) |
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2022
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