CN211725258U - Hydrogen chloride gas absorbing device - Google Patents
Hydrogen chloride gas absorbing device Download PDFInfo
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- CN211725258U CN211725258U CN201922112202.6U CN201922112202U CN211725258U CN 211725258 U CN211725258 U CN 211725258U CN 201922112202 U CN201922112202 U CN 201922112202U CN 211725258 U CN211725258 U CN 211725258U
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Abstract
The utility model relates to a hydrogen chloride gas absorbing device especially relates to amine-water method chemical absorption, belongs to chemical production technical field. In order to solve the problem that no proper device is available for absorbing hydrogen chloride by an amine-water method, the device comprises an absorption tank, a circulating pump, a cooler and a jet pump. Separating amine from water in a primary absorption tank, circularly spraying water phase, and absorbing hydrogen chloride gas into the absorption tank to be chemically absorbed by the amine to form an amine salt aqueous solution. The unabsorbed hydrogen chloride enters a secondary absorption tank and is physically absorbed by water to form dilute hydrochloric acid, and the dilute hydrochloric acid is transferred to a primary absorption tank to react with amine. The utility model discloses no dust pollution, amine salt concentration is controllable, and no solid blocks up the problem, has saved the absorption tower, can save equipment investment, and area is less, can change the absorption liquid under the circumstances of not stopping, and continuity of operation is fit for industrial production and uses.
Description
Technical Field
The utility model relates to a hydrogen chloride gas absorbing device, in particular to a device which uses amine-water as an absorbent and absorbs hydrogen chloride gas by a chemical method, belonging to the technical field of chemical production.
Background
In the prior process of producing phosphite ester or phosphate ester by taking phosphorus trichloride or phosphorus oxychloride as raw materials, a large amount of hydrogen chloride is by-produced. Hydrogen chloride has strong stimulation to eye and respiratory mucosa, strong corrosivity, and toxicity, and can not be discharged directly.
Traditionally, hydrogen chloride is absorbed by water to convert it to hydrochloric acid as a by-product. In recent years, the hydrochloric acid as a byproduct is sold in a lost state due to the supply of the hydrochloric acid is larger than the demand, and even the hydrochloric acid cannot be sold after being pasted upside down, so that a large amount of overstocking is generated in some enterprises, and the phenomenon of 'warehouse expansion' occurs.
If the hydrogen chloride is converted into the ammonium chloride, the ammonium chloride is industrially used for dry batteries, electroplating, dye houses, precision casting and the like, and is agriculturally used as a fertilizer, the market demand is huge, and the problem of the out-going of byproduct hydrogen chloride can be solved.
The existing method for converting hydrogen chloride into ammonium chloride is divided into a direct method and an indirect method. The direct method comprises the direct reaction of ammonia gas or ammonia water and hydrogen chloride; the indirect method is to prepare amine hydrochloride (amine salt for short) by reacting liquid amine with hydrogen chloride, then react with ammonia water to prepare ammonium chloride and recover amine.
The direct method of the ammonia gas and hydrogen chloride gas phase reaction is adopted, and the reaction releases heat, the temperature is as high as 180 ℃, the generated powdery ammonium chloride solid is difficult to gather, the dust is diffused, and the ammonium chloride with extremely fine granularity which cannot be caught pollutes the environment.
The direct method of ammonia water and hydrogen chloride gas-liquid phase reaction is adopted, because the reaction is instantly completed, strong heat is released, the temperature is too high, the ammonium chloride is thermally decomposed, the ammonia water is gasified, the reaction with the gas phase has dust pollution, the system pressure is increased, and potential safety hazards exist, and cooling measures are adopted, because the solubility of the ammonium chloride is greatly changed along with the temperature, the control is difficult under the condition that evaporation and cooling crystallization coexist, the ammonium chloride crystallization is often separated out to block a pipeline, and the production cannot be normally carried out.
The indirect method of liquid-liquid phase reaction, which uses water as solvent and water-insoluble N-methylaniline, N-ethylaniline, N-dimethylaniline or N, N-diethylaniline as hydrogen chloride absorbent, is called amine-water method for short, and can overcome the defects of the direct method.
The existing hydrogen chloride absorption devices are all devices for preparing by-product hydrochloric acid by water absorption, and the absorption process is physical absorption and is not suitable for the chemical absorption process of an amine-water method.
Disclosure of Invention
The utility model discloses the technical problem that will solve is: the device is suitable for the requirement of chemical absorption of hydrogen chloride gas by an amine-water method, and a hydrogen chloride gas absorption device is researched and designed.
In order to solve the technical problem, the hydrogen chloride gas absorption device comprises a primary absorption tank, a primary circulating pump, a primary cooler, a primary jet pump, a secondary absorption tank, a secondary circulating pump, a secondary cooler and a secondary jet pump;
the liquid outlet at the bottom of the primary absorption tank is connected with the inlet of the primary circulating pump through a pump inlet valve a;
the outlet of the primary circulating pump is connected with the circulating absorption liquid inlet at the side part of the primary cooler through a pump outlet valve a;
a circulating absorption liquid outlet at the bottom of the primary cooler is connected with a liquid inlet at the top of the primary injection pump;
a liquid outlet at the bottom of the primary injection pump is connected with a liquid return port at the top of the primary absorption tank, and a tail gas port at the top of the primary absorption tank is connected with a gas suction port at the side part of the secondary injection pump;
a liquid outlet at the bottom of the secondary injection pump is connected with a liquid return port at the top of the secondary absorption tank;
a liquid outlet at the bottom of the secondary absorption tank is connected with an inlet of a secondary circulating pump through a pump inlet valve b;
the outlet of the secondary circulating pump is connected with the circulating absorption liquid inlet at the bottom of the secondary cooler through a pump outlet valve b;
and a circulating absorption liquid outlet at the side part of the secondary cooler is connected with a liquid inlet at the top part of the secondary injection pump through a circulating valve and is connected with a dilute absorption liquid inlet at the top part of the primary absorption tank through a dilute absorption liquid valve.
According to the design concept, the amine and water separation is realized in the primary absorption tank, only water phase circulation is realized, the hydrogen chloride gas is firstly absorbed into water and is brought into the absorption tank, then liquid-liquid reaction is carried out on the hydrogen chloride gas and the amine to generate amine salt dissolved in the water, a large amount of absorption liquid exists in the absorption tank, a cooler is used for cooling in advance, and the problem of decomposition or water gasification of the amine salt caused by local overheating is solved.
Additionally, the utility model discloses a device is the second grade absorption, and wherein most absorption is one-level chemical absorption, only when the concentration of amine is lower in the one-level absorption tank, just need start the second grade circulating pump, carries out physical absorption to the hydrogen chloride gas of overflowing in the one-level absorption tank. The secondary circulating pump can be started and stopped in time in the actual operation process.
The utility model discloses utilize spiral version heat exchanger to cool off the absorption liquid, fluid resistance is little, and heat exchange efficiency is high, even if there is a small amount of amine salt solid particle also harmless in circulating water solution.
The utility model discloses utilize circulating water solution to spray at the jet pump and produce the negative pressure, absorb hydrogen chloride gas to the absorption tank in, the negative pressure operation is more safe.
The improved scheme aiming at the primary absorption tank and the secondary absorption tank is that the primary absorption tank and the secondary absorption tank are both horizontal storage tanks, and a baffle plate a, a thermometer sleeve plate a, a baffle plate b and a thermometer sleeve plate b are respectively arranged in the horizontal storage tanks; a thermometer a and a thermometer b are respectively inserted into the thermometer sleeve a and the thermometer sleeve b; the top of the first-stage absorption tank and the top of the second-stage absorption tank are respectively provided with a sight glass a, a sight glass b, a sight glass c and a sight glass d; an amine adding port at the top of the primary absorption tank is connected with an amine supply pipe through an amine adding valve; the water filling port at the top of the secondary absorption tank is connected with a water supply pipe through a water filling valve, and the vent at the top is connected with a vent pipe through a vent valve.
The improved scheme aiming at the first-stage circulating pump and the second-stage circulating pump is that both the first-stage circulating pump and the second-stage circulating pump are leakage-free centrifugal pumps; and one branch of the outlet of the first-stage circulating pump is connected with an absorption liquid output pipe through an output valve.
The improved scheme aiming at the primary cooler and the secondary cooler is that both the primary cooler and the secondary cooler are spiral plate heat exchangers; the circulating water inlet and outlet of the first-stage cooler are respectively connected with a circulating water upper water pipe a and a circulating water return pipe a, and the circulating water inlet and outlet of the second-stage cooler are respectively connected with a circulating water upper water pipe b and a circulating water return pipe b;
the improved scheme aiming at the primary injection pump and the secondary injection pump is that the primary injection pump and the secondary injection pump are both water injection vacuum pumps, and an air suction port on the side part of the primary injection pump is connected with a hydrogen chloride pipe.
The hydrogen chloride gas absorbing device has the advantages and beneficial effects that:
1. the liquid-liquid reaction is realized, and the product amine salt is dissolved in water, so that dust pollution caused by gas phase reaction is avoided;
2. the concentration of the amine salt is controllable, so that the pipeline is prevented from being blocked by precipitated solids;
3. the traditional multistage absorption tower used for byproduct hydrochloric acid can be saved, the equipment investment is saved, and the occupied area is small;
4. the whole device can replace the absorption liquid without stopping, thereby realizing continuous operation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and embodiments.
FIG. 1 is a schematic diagram of a hydrogen chloride gas absorption apparatus according to the present application;
FIG. 2 is a schematic view of the structure between two baffles;
in the above figure, 1, a primary absorption tank, 2, a primary circulation pump, 3, a primary cooler, 4, a primary jet pump, 5, a secondary absorption tank, 6, a secondary circulation pump, 7, a secondary cooler, 8, a secondary jet pump, 9, a pump outlet valve a, 10, a delivery valve, 11, a pump inlet valve a, 12, a baffle a, 13, a thermometer sleeve a, 14, a hydrogen chloride pipe, 15, a circulating water return pipe a, 16, a circulating water upper water pipe a, 17, an amine adding valve, 18, a thermometer a, 19, a sight glass a, 20, a dilute absorbent valve, 21, a sight glass b, 22, a tail gas port, 23, a circulation valve, 24, a water adding valve, 25, a thermometer b, 26, a sight glass c, 27, a sight glass d, 28, an emptying valve, 29, a circulating water return pipe b, 30, a circulating water upper water outlet valve b, 31, a pump b, 32, an inlet valve pump b, 33, a baffle b, 34, a thermometer sleeve b, 35. fluid side through holes a, 36, fluid bottom through holes, 37, fluid side through holes b.
Detailed Description
Example 1, as shown in fig. 1, a novel hydrogen chloride gas absorption apparatus includes a primary absorption tank 1, a primary circulation pump 2, a primary cooler 3, a primary jet pump 4, a secondary absorption tank 5, a secondary circulation pump 6, a secondary cooler 7, and a secondary jet pump 8.
Wherein, the liquid outlet at the bottom of the primary absorption tank 1 is connected with the inlet of the primary circulation pump 2 through a pump inlet valve a 11, the outlet of the primary circulation pump 2 is connected with the circulating absorption liquid inlet at the side part of the primary cooler 3 through a pump outlet valve a 9, the circulating absorption liquid outlet at the bottom of the primary cooler 3 is connected with the liquid inlet at the top of the primary injection pump 4, the liquid outlet at the bottom of the primary injection pump 4 is connected with the liquid return port at the top of the primary absorption tank 1, the tail gas port 22 at the top of the primary absorption tank 1 is connected with the suction port at the side part of the secondary injection pump 8, the liquid outlet at the bottom of the secondary injection pump 8 is connected with the liquid return port at the top of the secondary absorption tank 5, the liquid outlet at the bottom of the secondary absorption tank 5 is connected with the inlet of the secondary circulation pump 6 through a, the circulating absorption liquid outlet at the side part of the secondary cooler 7 is connected with the liquid inlet at the top part of the injection pump 8 through a circulating valve 23, and is connected with the dilute absorption liquid inlet at the top part of the absorption tank 1 through a dilute absorption liquid valve 20.
The first-stage absorption tank 1 and the second-stage absorption tank 5 are 10m carbon steel inner walls coated with fluoroplastic materials3The horizontal storage tank is internally provided with a PP baffle plate a 12, a glass-lined thermometer sleeve a 33, a PP baffle plate b 33 and a glass-lined thermometer sleeve b 34 respectively, a bimetallic thermometer a 18 and a thermometer b 25 with the measurement range of 0-100 ℃ are inserted into the thermometer sleeve a 33 and the thermometer sleeve b 34 respectively, the top of the thermometer sleeve a 19, a sight glass b 21, a sight glass c 26 and a sight glass d 27 are arranged at the top of the thermometer sleeve a 33 and the thermometer sleeve b 34 respectively, an amine adding port at the top of the primary absorption tank 1 is connected with an amine supply pipe through an amine adding valve 17, a water adding port at the top of the secondary absorption tank 5 is connected with a water supply pipe through a water adding valve 24.
The first-stage circulating pump 2 and the second-stage circulating pump 6 are magnetically-driven leakage-free centrifugal pumps made of carbon steel lining fluoroplastic materials, and have a lift of 30m and a flow of 40m3H, the power of the motor is 7.5kw, and one branch of an outlet of the primary circulating pump 2 is connected with the output valve 10Is connected with an absorption liquid output pipe.
The first-stage cooler 3 and the second-stage cooler 7 are 10m titanium materials2The circulating water inlet and outlet of the primary cooler 3 of the spiral plate heat exchanger are respectively connected with a circulating water upper water pipe a 16 and a circulating water return pipe a 15, and the circulating water inlet and outlet of the secondary cooler 7 of the spiral plate heat exchanger are respectively connected with a circulating water upper water pipe b 30 and a circulating water return pipe b 29.
The first-stage injection pump 4 and the second-stage injection pump 8 are water injection vacuum pumps made of glass lining materials, and the maximum air extraction amount is 130m3And h, an air suction port at the side part of the primary injection pump 4 is connected with a hydrogen chloride pipe 14.
Claims (5)
1. A hydrogen chloride gas absorption device is characterized in that: comprises a first-stage absorption tank (1), a first-stage circulating pump (2), a first-stage cooler (3), a first-stage jet pump (4), a second-stage absorption tank (5), a second-stage circulating pump (6), a second-stage cooler (7) and a second-stage jet pump (8);
a liquid outlet at the bottom of the primary absorption tank (1) is connected with an inlet of a primary circulating pump (2) through a pump inlet valve a (11);
the outlet of the primary circulating pump (2) is connected with the circulating absorption liquid inlet at the side part of the primary cooler (3) through a pump outlet valve a (9);
a circulating absorption liquid outlet at the bottom of the primary cooler (3) is connected with a liquid inlet at the top of the primary injection pump (4);
a liquid outlet at the bottom of the primary injection pump (4) is connected with a liquid return port at the top of the primary absorption tank (1), and a tail gas port (22) at the top of the primary absorption tank (1) is connected with a gas suction port at the side part of the secondary injection pump (8);
a liquid outlet at the bottom of the secondary injection pump (8) is connected with a liquid return port at the top of the secondary absorption tank (5);
a liquid outlet at the bottom of the secondary absorption tank (5) is connected with an inlet of a secondary circulating pump (6) through a pump inlet valve b (32);
the outlet of the secondary circulating pump (6) is connected with the circulating absorption liquid inlet at the bottom of the secondary cooler (7) through a pump outlet valve b (31);
and a circulating absorption liquid outlet at the side part of the secondary cooler (7) is connected with a liquid inlet at the top part of the secondary injection pump (8) through a circulating valve (23) and is connected with a dilute absorption liquid inlet at the top part of the primary absorption tank (1) through a dilute absorption liquid valve (20).
2. The hydrogen chloride gas absorption device according to claim 1, wherein: the primary absorption tank (1) and the secondary absorption tank (5) are both horizontal storage tanks, and are respectively internally provided with a baffle plate a (12), a thermometer sleeve a (13), a baffle plate b (33) and a thermometer sleeve b (34);
a thermometer a (18) and a thermometer b (25) are respectively inserted into the thermometer sleeve a (13) and the thermometer sleeve b (34);
the top parts of the primary absorption tank (1) and the secondary absorption tank (5) are respectively provided with a sight glass a (19), a sight glass b (21), a sight glass c (26) and a sight glass d (27);
an amine adding port at the top of the primary absorption tank (1) is connected with an amine supplying pipe through an amine adding valve (17);
the water filling port at the top of the secondary absorption tank (5) is connected with a water supply pipe through a water filling valve (24), and the vent at the top is connected with a vent pipe through a vent valve (28).
3. The hydrogen chloride gas absorption device according to claim 1 or 2, wherein: the primary circulating pump (2) and the secondary circulating pump (6) are both leakage-free centrifugal pumps;
one branch of the outlet of the primary circulating pump (2) is connected with an absorption liquid output pipe through an output valve (10).
4. The hydrogen chloride gas absorption device according to claim 3, wherein: the primary cooler (3) and the secondary cooler (7) are both spiral plate heat exchangers;
the circulating water inlet and outlet of the first-stage cooler (3) are respectively connected with a circulating water upper water pipe a (16) and a circulating water return pipe a (15), and the circulating water inlet and outlet of the second-stage cooler (7) are respectively connected with a circulating water upper water pipe b (30) and a circulating water return pipe b (29).
5. The hydrogen chloride gas absorption apparatus according to claim 4, wherein: the primary injection pump (4) and the secondary injection pump (8) are water injection vacuum pumps, and an air suction port on the side part of the primary injection pump (4) is connected with a hydrogen chloride pipe (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922112202.6U CN211725258U (en) | 2019-11-29 | 2019-11-29 | Hydrogen chloride gas absorbing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922112202.6U CN211725258U (en) | 2019-11-29 | 2019-11-29 | Hydrogen chloride gas absorbing device |
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| CN211725258U true CN211725258U (en) | 2020-10-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755762A (en) * | 2020-11-24 | 2021-05-07 | 陕西航天机电环境工程设计院有限责任公司 | Conventional rocket propellant waste gas treatment system |
| CN114405257A (en) * | 2021-12-23 | 2022-04-29 | 陕西航天机电环境工程设计院有限责任公司 | Propellant waste gas treatment device and method based on multistage pressure-stabilizing vacuum homogenization technology |
| CN114534469A (en) * | 2022-03-09 | 2022-05-27 | 山东康宝生化科技有限公司 | Device and method for solving problem of overlarge hydrochloric acid yield in sucralose waste liquid treatment process |
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2019
- 2019-11-29 CN CN201922112202.6U patent/CN211725258U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112755762A (en) * | 2020-11-24 | 2021-05-07 | 陕西航天机电环境工程设计院有限责任公司 | Conventional rocket propellant waste gas treatment system |
| CN114405257A (en) * | 2021-12-23 | 2022-04-29 | 陕西航天机电环境工程设计院有限责任公司 | Propellant waste gas treatment device and method based on multistage pressure-stabilizing vacuum homogenization technology |
| CN114534469A (en) * | 2022-03-09 | 2022-05-27 | 山东康宝生化科技有限公司 | Device and method for solving problem of overlarge hydrochloric acid yield in sucralose waste liquid treatment process |
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