CN114681934A - System for increasing concentration of mixed liquid or evaporating solvent - Google Patents
System for increasing concentration of mixed liquid or evaporating solvent Download PDFInfo
- Publication number
- CN114681934A CN114681934A CN202011556979.2A CN202011556979A CN114681934A CN 114681934 A CN114681934 A CN 114681934A CN 202011556979 A CN202011556979 A CN 202011556979A CN 114681934 A CN114681934 A CN 114681934A
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- Prior art keywords
- kettle
- desolventizing
- cauldron
- condenser
- liquid
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 50
- 238000001704 evaporation Methods 0.000 title claims abstract description 34
- 239000002904 solvent Substances 0.000 title claims abstract description 19
- 238000007701 flash-distillation Methods 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 4
- 230000008020 evaporation Effects 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 13
- 239000012808 vapor phase Substances 0.000 claims description 11
- 239000011555 saturated liquid Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000003507 refrigerant Substances 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000005292 vacuum distillation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009835 boiling Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention provides a system for increasing concentration of mixed liquid or evaporating solvent, which comprises: reation kettle, reation kettle passes through material transfer pipe connection in desolventizing cauldron, desolventizing cauldron passes through pipe connection in flash distillation cauldron, reation kettle and desolventizing between the cauldron be equipped with the relief pressure valve on the material transfer pipeline, flash distillation cauldron pass through pipe connection in the one-level condenser passes through pipe connection in the second grade condenser, be connected with vacuum negative pressure pipe, blow-down pipe on the second grade condenser, be equipped with the nitrogen gas input tube on desolventizing cauldron, the flash distillation cauldron. The invention can save the steam consumption, greatly shorten the production time, avoid the condition that a larger desolventizing kettle is needed due to the generation of foam, and save the investment.
Description
Technical Field
The invention relates to the technical field of concentration and purification equipment, in particular to a system for increasing the concentration of mixed liquid or evaporating a solvent.
Background
Steaming is the phenomenon that after high pressure saturated liquid enters a relatively low pressure vessel, the saturated liquid becomes a part of saturated vapor and saturated liquid at the vessel pressure due to the sudden pressure drop. The boiling point of a substance increases with increasing pressure, while the lower the pressure, the lower the boiling point. Therefore, the high-pressure and high-temperature mixed saturated liquid is decompressed and the evaporation area is increased, so that the boiling point of the saturated liquid is reduced, and most of the saturated liquid is evaporated instantly and enters the evaporator. At this time, the temperature of the fluid is higher than the boiling point at the pressure, the mixed liquid is boiled and vaporized rapidly in the evaporator, and two-phase separation is performed. The low-pressure evaporator has the function of providing a space for rapid gasification and vapor-liquid separation of fluid.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a system for increasing the concentration of a mixed liquid or evaporating a solvent, so as to solve the problems in the background art.
The technical problem solved by the invention is realized by adopting the following technical scheme: a system for mixing liquids to increase concentration or to distill off solvent, comprising: reation kettle, reation kettle passes through material transfer pipe connection in desolventizing cauldron, desolventizing cauldron passes through pipe connection in flash distillation cauldron, reation kettle and desolventizing between the cauldron be equipped with the relief pressure valve on the material transfer pipeline, flash distillation cauldron pass through pipe connection in the one-level condenser passes through pipe connection in the second grade condenser, be connected with vacuum negative pressure pipe, blow-down pipe on the second grade condenser, be equipped with the nitrogen gas input tube on desolventizing cauldron, the flash distillation cauldron.
Mixing and stirring devices are arranged in the reaction kettle, the desolventizing kettle and the flash evaporation kettle, sampling ports are arranged at the upper ends of the reaction kettle and the desolventizing kettle, and liquid level meters are arranged on one sides of the reaction kettle and the desolventizing kettle.
The reaction kettle and the desolventizing kettle are provided with a barometer and a thermometer, the outer sides of the desolventizing kettle and the flash evaporation kettle are provided with temperature control devices, and the temperature control devices are steam heating devices.
The first-stage condenser is a circulating water cooling medium condenser, and the second-stage condenser is a brine cooling medium condenser.
And a discharge pipe is arranged on a discharge valve at the lower end of the desolventizing kettle, a conveying pump is arranged on the discharge pipe, and the discharge pipe is connected to the diaphragm plate-and-frame filter press.
A method for mixing liquid to increase concentration or evaporating solvent comprises the following steps:
transferring the reacted mixed liquid in the reaction kettle into a desolventizing kettle through a pipeline, heating the mixed liquid to 90-95 ℃ by using steam, and pressurizing the desolventizing kettle to 0.5-0.58 Mpa by using 0.6Mpa nitrogen to form high-temperature and high-pressure saturated liquid;
step (2), closing the flash evaporation kettle and an emptying valve of a condensation collection system, and starting a vacuum pump to ensure that the vacuum degree reaches-0.08 to-0.09 Mpa; opening the first-stage condenser and the second-stage condenser, then opening the steam of the flash evaporation kettle, preheating the flash evaporation kettle to 70-75 ℃, and starting stirring of the flash evaporation kettle;
step (3), slowly opening a feed valve of a distributor in the flash evaporation kettle, controlling the flow rate to be 16-20L/min, instantly reducing the pressure and atomizing the liquid through the distributor, instantly reducing the pressure of the high-temperature and high-pressure mixed liquid along with the instant reduction of the pressure, and increasing the area of the high-temperature and high-pressure mixed liquid to form a low-pressure saturated vapor-liquid mixture, separating a vapor phase and a liquid phase in the flash evaporation kettle, introducing the vapor phase into a primary condenser and a secondary condenser along with vacuum through a vapor phase pipeline, condensing the vapor phase into liquid, and collecting the liquid in a liquid receiving tank;
and (4) after the mixed liquid in the desolventizing kettle is transferred, closing a feed valve of the distributor, and continuing vacuum distillation until all the solution is distilled out.
Compared with the prior art, the invention has the beneficial effects that: the invention can save the steam consumption, greatly shorten the production time, avoid the condition of needing a larger desolventizing kettle due to the generation of foam and save the investment.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In the description of the present invention, it should be noted that unless otherwise specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
As shown in fig. 1, a system for mixing liquids to increase concentration or to distill off solvent comprises: reation kettle 1, reation kettle 1 is connected in desolventizing cauldron 4 through changeing material pipeline 2, desolventizing cauldron 4 passes through pipe connection in flash distillation cauldron 6, reation kettle 1 and desolventizing cauldron 4 between change material pipeline 2 and be equipped with relief pressure valve 3, flash distillation cauldron 6 pass through pipe connection in one-level condenser 8 passes through pipe connection in second grade condenser 7, be connected with vacuum negative pressure pipe 9, blow-down pipe 10 on the second grade condenser 7, be equipped with nitrogen gas input pipe 13 on desolventizing cauldron 4, the flash distillation cauldron 6.
Mixing and stirring devices are arranged in the reaction kettle 1, the desolventizing kettle 4 and the flash evaporation kettle 6, a sampling port 5 is arranged at the upper ends of the reaction kettle 1 and the desolventizing kettle 4, and a liquid level meter is arranged on one side of the reaction kettle 1 and one side of the desolventizing kettle 4.
The reaction kettle 1 and the desolventizing kettle 4 are provided with barometers and thermometers, the outer sides of the desolventizing kettle 4 and the flash evaporation kettle 6 are provided with temperature control devices, and the temperature control devices are steam heating devices.
The primary condenser 8 is a circulating water refrigerant condenser, and the secondary condenser 7 is a brine refrigerant condenser.
A discharge pipe 11 is arranged on a discharge valve at the lower end of the desolventizing kettle 4, a delivery pump is arranged on the discharge pipe 11, and the discharge pipe 11 is connected to a diaphragm plate-and-frame filter press 12.
A method for mixing liquid to increase concentration or evaporating solvent comprises the following steps:
and (1) transferring the reacted mixed liquid in the reaction kettle 1 into a desolventizing kettle 4 through a pipeline, heating the mixed liquid to 90-95 ℃ by using steam, and pressurizing the desolventizing kettle 4 to 0.5-0.58 Mpa by using 0.6Mpa nitrogen to form high-temperature and high-pressure saturated liquid.
Step (2), closing the flash evaporation kettle 6 and an emptying valve of a condensation collection system, and starting a vacuum pump to ensure that the vacuum degree reaches-0.08 to-0.09 Mpa; opening the first-stage condenser and the second-stage condenser, opening the steam of the flash evaporation kettle 6, preheating the flash evaporation kettle 6 to 70-75 ℃, and starting the stirring of the flash evaporation kettle 6;
and (3) slowly opening a feed valve of a distributor in the flash evaporation kettle 6, controlling the flow rate to be 16-20L/min, instantly reducing the pressure of the liquid through the distributor, and instantly reducing the pressure of the high-temperature and high-pressure mixed liquid to be atomized, wherein the area of the high-temperature and high-pressure mixed liquid is increased to form a low-temperature mixed liquid along with the instant reduction of the pressure and the increase of the areaSeparating vapor phase from liquid phase in flash evaporation kettle 6, introducing vapor phase into 70m with vacuum via vapor phase pipeline2First order sum of 20m2The secondary condenser is condensed into liquid and collected in the liquid receiving tank.
And (4) after the mixed liquid in the desolventizing kettle 4 is completely transferred, closing a feed valve of the distributor, and continuing vacuum distillation until 1400L of solution is distilled out.
Example 1
After the reaction, the temperature of the pesticide product A and a solvent heptane is 75 ℃, the system pressure is normal pressure, and the pressure is increased to 0.3-0.4Ppa by nitrogen; the desolventizing kettle is vacuumized, a valve on a material transferring pipeline between the reaction kettle and the desolventizing kettle is opened, the flow is controlled by a pressure reducing valve, the material is slowly transferred into the desolventizing kettle for desolventizing, the solvent is removed by flash evaporation, and when the liquid level in the desolventizing kettle is high enough, stirring is opened, heating is opened, and the desolventizing can be faster. Thus saving the steam consumption and greatly shortening the time, which is generally more than 50%.
Example 2
Color developing agent product B, solvent ethanol, temperature 70-75 deg.C after reaction, system pressure 0.3-0.4 Ppa; vacuumizing the desolventizing kettle, opening a valve on a material transferring pipeline between the reaction kettle and the desolventizing kettle, controlling flow through a pressure reducing valve, slowly transferring the material into the desolventizing kettle for desolventizing, removing a solvent by flash evaporation, and opening stirring, opening heating and enabling the desolventizing to be quicker when the liquid level in the desolventizing kettle is high enough. Thus saving the steam consumption and greatly shortening the time, which is generally more than 50%. The product also can generate foam in the desolventizing process, so the method can avoid the condition that a larger desolventizing kettle is needed due to the foam generation, and the investment is saved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A system for mixing liquids to increase concentration or to distill off solvent, comprising: reation kettle (1), its characterized in that: reation kettle (1) is connected in desolventizing cauldron (4) through changeing material pipeline (2), desolventizing cauldron (4) are through pipe connection in flash distillation cauldron (6), reation kettle (1) and desolventizing cauldron (4) between change material pipeline (2) and be equipped with relief pressure valve (3), flash distillation cauldron (6) through pipe connection in one-level condenser (8) are through pipe connection in second grade condenser (7), be connected with vacuum negative pressure pipe (9), blow-down pipe (10) on second grade condenser (7), be equipped with nitrogen gas input tube (13) on desolventizing cauldron (4), flash distillation cauldron (6).
2. A system for mixing liquids to increase the concentration or to distill off solvent according to claim 1, wherein: be equipped with mixing stirring device in reation kettle (1), desolventizing cauldron (4), flash distillation cauldron (6), reation kettle (1), desolventizing cauldron (4) upper end is equipped with sample connection (5), reation kettle (1), desolventizing cauldron (4) one side are equipped with the level gauge.
3. A system for mixing liquids to increase the concentration or to distill off solvent according to claim 2, wherein: the reaction kettle (1) and the desolventizing kettle (4) are provided with a barometer and a thermometer, the outer sides of the desolventizing kettle (4) and the flash evaporation kettle (6) are provided with temperature control devices, and the temperature control devices are steam heating devices.
4. A system for mixing liquids to increase the concentration or to distill off solvent according to claim 1, wherein: the primary condenser (8) is a circulating water refrigerant condenser, and the secondary condenser (7) is a brine refrigerant condenser.
5. A system for mixing liquids to increase the concentration or to distill off solvent according to claim 1, wherein: the device is characterized in that a discharge pipe (11) is arranged on a discharge valve at the lower end of the desolventizing kettle (4), a conveying pump is arranged on the discharge pipe (11), and the discharge pipe (11) is connected to a diaphragm plate-and-frame filter press (12).
6. A method for mixing liquid to increase concentration or evaporating solvent comprises the following steps:
transferring the reacted mixed liquid in the reaction kettle into a desolventizing kettle through a pipeline, heating the mixed liquid to 90-95 ℃ by using steam, and pressurizing the desolventizing kettle to 0.5-0.58 Mpa by using 0.6Mpa nitrogen to form high-temperature and high-pressure saturated liquid;
step (2), closing the flash evaporation kettle and an emptying valve of a condensation collection system, and starting a vacuum pump to ensure that the vacuum degree reaches-0.08 to-0.09 Mpa; opening the first-stage condenser and the second-stage condenser, then opening the steam of the flash evaporation kettle, preheating the flash evaporation kettle to 70-75 ℃, and starting stirring of the flash evaporation kettle;
step (3), slowly opening a feed valve of a distributor in the flash evaporation kettle, controlling the flow rate to be 16-20L/min, instantly reducing the pressure and atomizing the liquid through the distributor, instantly reducing the pressure of the high-temperature and high-pressure mixed liquid along with the instant reduction of the pressure, and increasing the area of the high-temperature and high-pressure mixed liquid to form a low-pressure saturated vapor-liquid mixture, separating a vapor phase and a liquid phase in the flash evaporation kettle, introducing the vapor phase into a primary condenser and a secondary condenser along with vacuum through a vapor phase pipeline, condensing the vapor phase into liquid, and collecting the liquid in a liquid receiving tank;
and (4) after the mixed liquid in the desolventizing kettle is transferred, closing a feed valve of the distributor, and continuing vacuum distillation until all the solution is distilled out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011556979.2A CN114681934A (en) | 2020-12-25 | 2020-12-25 | System for increasing concentration of mixed liquid or evaporating solvent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011556979.2A CN114681934A (en) | 2020-12-25 | 2020-12-25 | System for increasing concentration of mixed liquid or evaporating solvent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114681934A true CN114681934A (en) | 2022-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011556979.2A Pending CN114681934A (en) | 2020-12-25 | 2020-12-25 | System for increasing concentration of mixed liquid or evaporating solvent |
Country Status (1)
| Country | Link |
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| CN (1) | CN114681934A (en) |
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|---|---|---|---|---|
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-
2020
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| JP2011074373A (en) * | 2009-09-04 | 2011-04-14 | Idemitsu Kosan Co Ltd | Apparatus and method for removing volatile component in polymer solution and polymerization apparatus |
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