CN113996244A - Production device and production process for reducing solvent oil content in butadiene rubber - Google Patents
Production device and production process for reducing solvent oil content in butadiene rubber Download PDFInfo
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- CN113996244A CN113996244A CN202111239088.9A CN202111239088A CN113996244A CN 113996244 A CN113996244 A CN 113996244A CN 202111239088 A CN202111239088 A CN 202111239088A CN 113996244 A CN113996244 A CN 113996244A
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- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
- B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
- B01D5/009—Collecting, removing and/or treatment of the condensate
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F136/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F136/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F136/04—Homopolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F136/06—Butadiene
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Abstract
The invention belongs to the technical field of butadiene rubber production, and relates to a production device for reducing the content of solvent oil in butadiene rubber and a production process thereof. The production device comprises a condensation system, an oil-water layering tank, a vacuum pump system and a refining system, wherein the condensation system comprises a condensation first kettle, a condensation middle kettle and a condensation last kettle which are sequentially connected, the oil-water layering tank receives solvent oil, butadiene and water vapor evaporated from the condensation first kettle, after non-condensable gas of the oil-water layering tank is condensed by an emptying condenser, the solvent oil is sent into the refining system by the vacuum pump system, the vacuum pump system comprises a water ring vacuum pump and a gas-liquid separation tank which are sequentially connected, an inlet of the water ring vacuum pump is connected with a gas phase outlet of the oil-water layering tank, and an outlet of the gas-liquid separation tank is connected with a gas phase inlet of the refining system. The production device can reduce the pressure of the first kettle of the coagulation system, and further reduce the content of the solvent oil in the rubber blocks and the content of VOCs in the rubber blocks.
Description
Technical Field
The invention relates to the technical field of butadiene rubber production, in particular to a production device for reducing the content of solvent oil in butadiene rubber and a production process thereof.
Background
In the production process of butadiene rubber, the finished rubber block necessarily contains trace solvent oil components which cannot be completely removed, such as n-hexane, so that the content of VOCs (volatile organic compounds) in the rubber block is relatively high, and the quality of the rubber block is influenced to a certain extent, thereby influencing the acceptance and satisfaction of customers to products, and simultaneously increasing the cost of production enterprises. VOCs can be further classified into eight categories according to their chemical structures: alkanes, aromatic hydrocarbons, alkenes, halocarbons, esters, aldehydes, ketones, and others. VOCs participate in the formation of ozone and secondary aerosols in the atmospheric environment, which have important effects on regional atmospheric ozone pollution and PM2.5 pollution. Most VOCs have unpleasant special odor and have toxic, irritant, teratogenic and carcinogenic effects, and particularly benzene, toluene, formaldehyde and the like cause great harm to human health. VOCs are important precursors causing urban dust haze and photochemical smog and mainly come from the processes of coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and using and the like.
At present, on the premise of not changing the coagulation kettle equipment body, stirring form and spatial position, the solvent oil content in the colloidal particles is difficult to further reduce by combining the process principle of three-kettle coagulation and optimizing reasonable control conditions such as temperature, pressure, liquid level and the like.
Disclosure of Invention
Therefore, in order to solve the above problems, it is necessary to provide a production apparatus and a production process thereof for reducing the content of the solvent oil in the butadiene rubber, which can continuously reduce the pressure of the first kettle of the coagulation system, and further reduce the content of the solvent oil in the rubber block and the content of VOCs in the rubber block again.
The utility model provides a reduce apparatus for producing of solvent oil content in butadiene rubber, is including the coacervation system that is equipped with the first cauldron of condensation, still includes profit layering jar, vacuum pump system and refined system, profit layering jar is received solvent oil, butadiene and the vapor that the first cauldron of condensation evaporated out, the noncondensable gas of profit layering jar is through unloading condenser condensation back, solvent oil by vacuum pump system sends into refined system, vacuum pump system is including the water ring vacuum pump and the gas-liquid separation jar that connect gradually, water ring vacuum pump's entry with the gaseous phase export of profit layering jar links to each other, the export of gas-liquid separation jar with the gaseous phase entry of refined system links to each other.
In one embodiment, the system further comprises a solvent buffer tank, wherein the solvent buffer tank receives the solvent oil discharged from the oil-water separation tank, the non-condensable gas of the oil-water separation tank is condensed by a vent condenser, and the liquid phase returns to the solvent buffer tank.
In one embodiment, an oil-gas heat exchanger is connected between the first condensation kettle and the oil-water separation tank, and solvent oil, butadiene and water vapor evaporated from the first condensation kettle enter the oil-water separation tank after being cooled by the oil-gas heat exchanger.
In one embodiment, the solvent oil, butadiene and water vapor distilled from the condensation initial kettle are filtered by an oil-gas filter and then sent to the oil-gas heat exchanger.
In one embodiment, the refining system comprises a gas phase buffer tank and a crude solvent oil tank which are connected in sequence, the crude solvent oil tank receives the gas phase discharged from the gas phase buffer tank, and a gas phase inlet of the gas phase buffer tank is connected with an outlet of the gas-liquid separation tank.
In one embodiment, the vacuum pump system comprises two groups of vacuum pumps connected in parallel, each group of vacuum pumps comprises a water ring vacuum pump and a gas-liquid separation tank which are connected in sequence, an inlet of each water ring vacuum pump is connected with a gas phase outlet of the oil-water separation tank, and an outlet of each gas-liquid separation tank is connected with a gas phase inlet of the gas phase buffer tank.
In one embodiment, the gas phase inlet of the gas phase buffer tank is also connected with the gas phase outlet of the gas-liquid separation tank.
A production process of a production device for reducing the content of solvent oil in butadiene rubber comprises the following steps:
rubber in the coagulation system is coagulated by a elutriation method, and solvent oil, butadiene and water vapor distilled from a first coagulation kettle are filtered by an oil gas filter to obtain fine rubber particles;
cooling by an oil-gas heat exchanger, then entering an oil-water layering tank, introducing solvent oil into a solvent buffer tank, and discharging layered water or supplementing water to the condensation first kettle;
the oil-water layering tank with the noncondensable gas of solvent buffer tank is through the condenser condensation that empties, and the liquid phase returns the solvent buffer tank, the vapor phase buffer tank is sent to by vacuum pumping system to solvent oil, and the gaseous phase is sent into crude solvent oil tank recycle after the buffering, wherein, vacuum pumping system includes parallelly connected two sets of vacuum pumps, and every group vacuum pump is including the water ring vacuum pump and the gas-liquid separation jar that connect gradually, every water ring vacuum pump's entry respectively with the gaseous phase export of oil-water layering tank links to each other, every the export of gas-liquid separation jar respectively with the gaseous phase entry of vapor phase buffer tank links to each other.
In one embodiment, each gas-liquid separation tank is subjected to water changing and temperature reduction periodically according to preset time.
In one embodiment, the liquid phase condensed by the gas phase buffer tank is collected periodically according to a preset time.
The condensation system of the production device for reducing the content of the solvent oil in the butadiene rubber adopts a three-kettle condensation principle, the condensation system operates stably, and the quality of the finished rubber block is stable and reliable. Solvent oil, butadiene and water vapor evaporated from the condensation first kettle enter an oil-water layering tank, layered water is discharged outside or used for supplementing water to the condensation first kettle, non-condensable gas which cannot be cooled is condensed by an emptying condenser, and then is discharged into the atmosphere after passing through a flame arrester through the emptying condenser in the whole process, and the solvent oil is sent to a refining system by a vacuum pump system. The invention adds a water ring vacuum pump and a gas-liquid separation tank, and the gas phase of the oil-water separation tank is sent to a refining unit through the water ring vacuum pump and recycled. The invention can continuously reduce the pressure of the first kettle of the condensation system, further control the pressure of the first kettle of the condensation system, and further reduce the content of the solvent oil in the rubber block and the content of VOCs in the rubber block again.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
In the figure: 10. a condensation first kettle; 20. a condensation middle kettle; 30. a condensation end kettle; 40. oil-water layering tank; 50. a solvent buffer tank; 60. an oil-gas heat exchanger; 70. a water-ring vacuum pump; 80. a gas-liquid separation tank; 90. a gas phase buffer tank; 100. a crude solvent oil tank.
Detailed Description
The production device and the production process for reducing the content of the solvent oil in the butadiene rubber provided by the invention are further described with reference to the attached drawings.
Referring to fig. 1, the production apparatus for reducing the content of solvent oil in butadiene rubber provided by the present invention comprises a coagulation system, an oil-water separation tank 40, a vacuum pump system and a refining system, wherein the coagulation system preferably comprises a first coagulation kettle 10, a middle coagulation kettle 20 and a last coagulation kettle 30 which are connected in sequence, and preferably, the first coagulation kettle 10, the middle coagulation kettle 20 and the last coagulation kettle 30 are distributed side by side; the profit layering jar 40 is received solvent naphtha, butadiene (volatile organic compounds) and the steam that the first cauldron 10 of condensation evaporated, the noncondensable gas of profit layering jar 40 is through the evacuation condenser condensation after, the solvent naphtha by vacuum pump system sends into the refining system, vacuum pump system is including the water ring vacuum pump 70 and the gas-liquid separation jar 80 that connect gradually, water ring vacuum pump 70's entry with the gas phase outlet of profit layering jar 40 links to each other, the export of gas-liquid separation jar 80 with the gas phase inlet of refining system links to each other.
The invention designs a device for continuously reducing the pressure of the first kettle of a coagulation system, so that the contents of solvent oil in a rubber block and VOCs in the rubber block are reduced again.
Specifically, the condensation system adopts a three-kettle condensation principle, the condensation system comprises a condensation first kettle 10, a condensation middle kettle 20 and a condensation last kettle 30 which are connected in sequence, all the devices are connected and fixed by pipeline flange welding bolts, and the structure is firm and compact; the coagulation adopts a water precipitation method, which utilizes the principle of steam distillation, namely, solvent oil and unreacted butadiene are evaporated out of glue solution under the action of hot water, steam and mechanical stirring in a coagulation kettle and are separated from rubber, and the rubber is suspended in the hot water in a granular form and is conveyed to a finished product workshop.
The solvent oil, unreacted butadiene and water vapor distilled out of the final condensation kettle 30 are led into the middle condensation kettle 20, the solvent oil, unreacted butadiene and water vapor distilled out of the middle condensation kettle 20 are led into the first condensation kettle 10, and finally the solvent oil, butadiene and water vapor distilled out of the first condensation kettle 10 are received by the oil-water layering tank 40, so that the whole condensation system is stable in operation, the quality of the finished rubber block is stable, and the quality is reliable.
It is worth mentioning that: the first condensation kettle 10, the middle condensation kettle 20 and the last condensation kettle 30 in the invention adopt similar or basically same structural design, and each condensation kettle mainly comprises a condensation kettle body, each inlet and outlet arranged on the condensation kettle body, a mechanical stirring mechanism arranged in the condensation kettle body and a control unit/control motor arranged outside the condensation kettle body and used for controlling the action of the corresponding mechanical stirring mechanism.
The solvent oil, butadiene (volatile organic compounds) and steam evaporated from the first condensation kettle 10 enter an oil-water layering tank 40, the layered water is discharged outside or used for water supplement of the first condensation kettle 10, after non-condensable gas (non-liquefied solvent oil and butadiene) of the oil-water layering tank 40 is condensed by an emptying condenser, a liquid phase (liquefied solvent oil) returns to a solvent buffer tank 50 (further elaboration below), the non-condensable gas (butadiene) which cannot be cooled is discharged into the atmosphere after passing through a flame arrester through the emptying condenser in the whole process, and the solvent oil is sent to a unit of a refining system by a vacuum pump system.
According to the invention, a water-ring vacuum pump 70 and a gas-liquid separation tank 80 are added, the gas phase (solvent oil and unseparated water vapor) of the oil-water separation tank 40 is sent to a refining system through the water-ring vacuum pump 70 and recycled, the pressure of the oil-water separation tank 40 can be effectively controlled, the pressure of the primary condensation kettle 10 is further controlled, and a water circulation type vacuum pump is adopted to adjust the system pressure of the primary condensation kettle 10. The content of the solvent oil in the prior rubber block is 250mg/kg-400mg/kg, the content of the solvent oil in the rubber block can be reduced to 100mg/kg by the invention, and the separated solvent oil can be recycled. The invention has wide application range and can be widely applied to the field of petrochemical rubber production.
In the scheme, the butadiene rubber production device further comprises a solvent buffer tank 50, the solvent buffer tank 50 receives the solvent oil discharged from the oil-water separation tank 40, and after the non-condensable gas of the oil-water separation tank 40 is condensed by an emptying condenser, the liquid phase returns to the solvent buffer tank 50.
It is worth mentioning that: the solvent buffer tank 50 in this case has two inlets, one inlet is used for directly receiving the solvent oil discharged from the oil-water separation tank 40 in an initial state, and the other inlet is used for recovering a liquid phase after the non-condensable gas is condensed.
The solvent oil that first cauldron 10 of condensation evaporated, butadiene and steam go into profit layering jar 40 after cooling down, the solvent oil gets into solvent buffer tank 50, the outer row of layering water or as giving first cauldron 10 of condensation moisturizing usefulness, the noncondensable gas of profit layering jar 40 and solvent buffer tank 50 is through the condenser condensation of emptying, the liquid phase returns solvent buffer tank 50, the noncondensable gas that can not cool off discharges in the atmosphere after the fire arrestor through emptying condenser whole journey, the solvent oil is sent to the refined system by vacuum pump system.
In one embodiment, an oil-gas heat exchanger 60 is connected between the first condensation kettle 10 and the oil-water separation tank 40, and the solvent oil, butadiene and water vapor evaporated from the first condensation kettle 10 enter the oil-water separation tank 40 after being cooled by the oil-gas heat exchanger 60.
The inlet of the oil-gas heat exchanger 60 is communicated with the gas phase outlet of the condensation first kettle 10, and the outlet of the oil-gas heat exchanger 60 is communicated with the inlet of the oil-water stratified tank 40. During operation, the solvent oil, butadiene and water vapor evaporated from the condensation first kettle 10 are cooled by the oil-gas heat exchanger 60 and then enter the oil-water layering tank 40, and the solvent oil enters the solvent buffer tank 50.
Further, the solvent oil, the butadiene and the water vapor evaporated from the first condensation kettle 10 are filtered by an oil-gas filter and then sent to the oil-gas heat exchanger 60, and the solvent oil, the butadiene and the water vapor evaporated from the first condensation kettle 10 are filtered by the oil-gas filter to obtain fine glue particles.
In one embodiment, the refining system comprises a gas phase buffer tank 90 and a crude solvent oil tank 100 which are connected in sequence, wherein the crude solvent oil tank 100 receives the gas phase discharged from the gas phase buffer tank 90, and a gas phase inlet of the gas phase buffer tank 90 is connected with an outlet of the gas-liquid separation tank 80.
The gas phase buffer tank 90 may be cooled, and during operation, the gas phases of the oil-water separation tank 40 and the solvent buffer tank 50 are sent to the refining unit gas phase buffer tank 90 through the water ring vacuum pump 70 and the gas-liquid separation tank 80, the buffered gas phases are sent to the refining unit crude solvent oil tank 100 for recycling, and the condensed liquid phase of the gas phase buffer tank 90 is periodically collected.
In one embodiment, the vacuum pump system comprises two sets of vacuum pumps connected in parallel, each set of vacuum pump comprises a water ring vacuum pump 70 and a gas-liquid separation tank 80 connected in sequence, an inlet of each water ring vacuum pump 70 is connected with a gas phase outlet of the oil-water separation tank 40, and an outlet of each gas-liquid separation tank 80 is connected with a gas phase inlet of the gas phase buffer tank 90.
In the present case, still preferably two water ring vacuum pumps 70, two gas-liquid separation jar 80 total four equipment also distribute side by side, and each pipe connection is reasonable inseparable, and preferably adopts pipeline flange welding bolted connection fixed, and is fixed firm.
Further, a gas phase inlet of the gas phase buffer tank 90 is connected with a gas phase outlet of the gas-liquid separation tank 80, and the gas phase inlet of the gas phase buffer tank 90 is connected with the gas phase outlets of the gas-liquid separation tanks 80 and the gas phase outlets of the gas-liquid separation tanks 80 in parallel.
The butadiene rubber production device is provided with two water-ring vacuum pumps 70 and two gas-liquid separation tanks 80, the gas phases of an oil-water layering tank 40 and a solvent buffer tank 50 are sent to the corresponding gas-liquid separation tanks 80 through the water-ring vacuum pumps 70, and then sent to a refining unit gas-phase buffer tank 90 through the corresponding gas-liquid separation tanks 80, the inlets of the gas-phase buffer tanks 90 are also connected with the outlets of the two gas-liquid separation tanks 80 in parallel, the buffered gas phases are sent to a crude solvent oil tank 100 for recycling, and the condensed liquid phases of the gas-phase buffer tanks 90 are periodically collected.
The whole structure is reasonable and compact in design, in order to increase the vacuum degree and improve the gas phase recovery rate, the inlets of the two groups of water ring vacuum pumps 70 are arranged in parallel, the outlets of the two gas-liquid separation tanks 80 are arranged in parallel, and the two gas-liquid separation tanks 80 are preferably used for exchanging water and cooling every day so as to ensure that the water ring vacuum pumps 70 operate well. The pressure of the condensation first kettle 10 after the whole system is transformed is obviously reduced, and the solvent oil removing effect is obvious. Compared with the rubber before modification, the content of the solvent oil in the rubber is obviously reduced, and the modification measure effect is obvious.
In the normal production process, the two water-ring vacuum pumps 70 are started, so that the tank pressures of the oil-water layering tank 40 and the solvent buffer tank 50 can be reduced, the oil-water layering tank 40 and the solvent buffer tank 50 of the coagulation system are ensured to keep micro-positive pressure, and the original pressure of 100KPa can be reduced to 35KPa-50KPa, so that the pressure of the primary coagulation kettle 10 is reduced to within 50KPa from original 150KPa, the removal effect of the solvent oil in the colloidal particles is improved, and the oil consumption of 15kg/t of glue in the colloidal particles can be reduced according to actual operation and data analysis.
In the present invention, each gas phase outlet is provided at a position above the corresponding apparatus, for example, the oil-water separation tank 40, the gas phase buffer tank 90, the condensation initial tank 10, and the gas-liquid separation tank 80. And all the devices are fixedly connected by pipeline flange welding bolts, so that the structure is firm and compact, and the disassembly and the assembly are more convenient and efficient.
In the invention, the production process of the production device for reducing the content of the solvent oil in the butadiene rubber comprises the following steps:
rubber in a coagulation system is coagulated by a elutriation method, and solvent oil, butadiene and water vapor distilled out from a coagulation first kettle 10 are filtered by an oil gas filter to obtain fine rubber particles;
cooling by an oil-gas heat exchanger 60, then entering an oil-water layering tank 40, entering solvent oil into a solvent buffer tank 50, and discharging layering water outwards or supplementing water to the condensation first kettle 10;
after the non-condensable gas of the oil-water separation tank 40 and the solvent buffer tank 50 is condensed by an emptying condenser, the liquid phase returns to the solvent buffer tank 50, the solvent oil is sent to the gas phase buffer tank 90 by a vacuum pump system, the buffered gas phase is sent to the crude solvent oil tank 100 for recycling, and the condensed liquid phase of the gas phase buffer tank 90 is collected periodically according to preset time;
the vacuum pump system comprises two groups of vacuum pumps connected in parallel, each group of vacuum pumps comprises a water ring vacuum pump 70 and a gas-liquid separation tank 80 which are sequentially connected, an inlet of the water ring vacuum pump 70 is respectively connected with a gas phase outlet of the oil-water separation tank 40, and an outlet of the gas-liquid separation tank 80 is respectively connected with a gas phase inlet of the gas phase buffer tank 90.
Preferably, each of the gas-liquid separation tanks 80 is periodically changed in water and cooled for a predetermined period of time. Further, water is changed and the temperature is reduced every day by optimizing and selecting, so that the water ring vacuum pump 70 is ensured to operate well.
In conclusion, the invention adopts a water separation method for coagulation, which utilizes the principle of steam distillation, namely that solvent oil and unreacted butadiene are evaporated out of a glue solution under the action of hot water, steam and mechanical stirring in a coagulation kettle to be separated from rubber, and the rubber is suspended in the hot water in a granular shape and is conveyed to a finished product workshop.
During operation, the solvent oil, butadiene and water vapor evaporated from the first condensation kettle 10 are filtered by an oil-gas filter to form fine glue particles, the fine glue particles are cooled by an oil-gas heat exchanger 60 and then enter an oil-water layering tank 40, the solvent oil enters a solvent buffer tank 50, the layered water is discharged outside or used for water supplement for the first condensation kettle 10, the non-condensable gas of the oil-water layering tank 40 and the solvent buffer tank 50 is condensed by an emptying condenser, the liquid phase returns to the solvent buffer tank 50, the non-condensable gas which can not be cooled is discharged into the atmosphere after passing through a flame arrester through the emptying condenser in the whole process, and the solvent oil is sent to a crude solvent oil tank (crude solvent oil tank 100) of a refining unit by a vacuum pump system.
In the technical scheme of the invention, two water ring vacuum pumps 70 and two gas-liquid separation tanks 80 are additionally arranged. The gas phases in the oil-water separation tank 40 and the solvent buffer tank 50 are sent to the gas phase buffer tank 90 of the refining unit by the water-ring vacuum pump 70, the buffered gas phases are sent to the crude solvent oil tank 100 for recycling, and the condensed liquid phases in the gas phase buffer tank 90 are periodically collected.
In order to increase the vacuum degree and improve the gas phase recovery rate, the second water-ring vacuum pump 70 is connected with the inlet and outlet of the first water-ring vacuum pump 70, and the two gas-liquid separation tanks 80 change water and reduce the temperature every day to ensure that the water-ring vacuum pump 70 runs well.
In the normal production process of the coacervation system, two water ring vacuum pumps 70 are started to reduce the tank pressure of the oil-water layering tank 40 and the solvent buffer tank 50, ensure that the oil-water layering tank 40 and the solvent buffer tank 50 of the coacervation system keep micro-positive pressure and can be reduced to 35KPa-50KPa from the original 100KPa, so that the pressure of the first condensation kettle 10 is reduced to within 50KPa from the original 150KPa, the removal effect of the solvent oil in the oil consumption colloidal particles is improved, and 15kg/t of glue in the colloidal particles can be reduced according to actual operation and data analysis.
The pressure of the condensation first kettle 10 after the system and the process are improved is obviously reduced, and the solvent oil removing effect is obvious. Compared with the rubber before modification, the content of the solvent oil in the rubber is obviously reduced, and the modification measure effect is obvious.
In addition, all the devices are fixedly connected through pipeline flange welding bolts, and the structure is firm and compact.
The invention also protects another embodiment mode, namely, the production process applying the cis-butadiene rubber production device, wherein the cis-butadiene rubber production device comprises a condensation system, an oil-water layering tank 40, a vacuum pump system and a refining system, the condensation system comprises a condensation first kettle 10, a condensation middle kettle 20 and a condensation last kettle 30 which are sequentially connected, the oil-water layering tank 40 receives solvent oil, butadiene (volatile organic compounds) and water vapor evaporated from the condensation first kettle 10, and after non-condensable gas of the oil-water layering tank 40 is condensed by an emptying condenser, the solvent oil is sent to the refining system by the vacuum pump system; the vacuum pump system comprises a water ring vacuum pump 70 and a gas-liquid separation tank 80 which are sequentially connected, wherein an inlet of the water ring vacuum pump 70 is connected with a gas phase outlet of the oil-water layering tank 40, and an outlet of the gas-liquid separation tank 80 is connected with a gas phase inlet of the refining system; the refining system comprises a gas phase buffer tank 90 and a crude solvent oil tank 100 which are sequentially connected, wherein the crude solvent oil tank 100 receives a gas phase discharged from the gas phase buffer tank 90, and a gas phase inlet of the gas phase buffer tank 90 is connected with an outlet of the gas-liquid separation tank 80; the production process comprises the following steps:
rubber in a coagulation system is coagulated by a elutriation method, and solvent oil, butadiene and water vapor distilled out from a coagulation first kettle 10 are filtered by an oil gas filter to obtain fine rubber particles;
the solvent oil is cooled by an oil-gas heat exchanger 60 and then enters an oil-water layering tank 40, the solvent oil enters a solvent buffer tank 50, the layered water is discharged outside or used for supplying water to the condensation first kettle 10, the non-condensable gas of the oil-water layering tank 40 and the solvent buffer tank 50 is condensed by an emptying condenser, the liquid phase returns to the solvent buffer tank 50, the solvent oil is sent to a gas phase buffer tank 90 by a vacuum pump system, the gas phase is sent to a crude solvent oil tank 100 for recycling after being buffered, and the condensed liquid phase of the gas phase buffer tank 90 is collected periodically according to preset time.
Further, the vacuum pump system in this embodiment includes two sets of vacuum pumps connected in parallel, each set of vacuum pump includes a water ring vacuum pump 70 and a gas-liquid separation tank 80 connected in sequence, an inlet of each water ring vacuum pump 70 is connected to a gas phase outlet of the oil-water separation tank 40, and an outlet of each gas-liquid separation tank 80 is connected to a gas phase inlet of the gas phase buffer tank 90.
The butadiene rubber production device and the production process thereof at least have the following technical effects:
firstly, the pressure of the oil-water separating tank can be effectively controlled, and further the pressure of a condensation first kettle is controlled;
secondly, a double-water-circulation vacuum pump is adopted to adjust the pressure of the condensation first kettle system, so that the pressure control and adjustment operation of the condensation system is feasible, and the contents of solvent oil and VOCs in the rubber block are reduced;
thirdly, the coagulation system operates stably, and the finished rubber block has stable quality and credible quality.
In the synthesis process of the butadiene rubber, the common solvent oil is n-hexane, so the solvent oils can be all n-hexane and can also be other suitable solvent oils.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a reduce apparatus for producing of solvent oil content in butadiene rubber, is including the condensation system that is equipped with the first cauldron of condensation, its characterized in that still includes profit layering jar, vacuum pump system and refining system, profit layering jar is received solvent oil, butadiene and the vapor that the first cauldron of condensation evaporated, after the noncondensable gas of profit layering jar passes through the evacuation condenser condensation, the solvent oil by vacuum pump system sends into refining system, vacuum pump system is including the water ring vacuum pump and the gas-liquid separation jar that connect gradually, the entry of water ring vacuum pump with the gas phase outlet of profit layering jar links to each other, the export of gas-liquid separation jar with the gas phase entry of refining system links to each other.
2. The production device for reducing the content of the solvent oil in the butadiene rubber as claimed in claim 1, further comprising a solvent buffer tank, wherein the solvent buffer tank receives the solvent oil discharged from the oil-water separation tank, and after the non-condensable gas in the oil-water separation tank is condensed by an emptying condenser, the liquid phase returns to the solvent buffer tank.
3. The production device for reducing the content of the solvent oil in the butadiene rubber according to claim 1, wherein an oil-gas heat exchanger is connected between the first condensation kettle and the oil-water separation tank, and the solvent oil, the butadiene and the water vapor evaporated from the first condensation kettle enter the oil-water separation tank after being cooled by the oil-gas heat exchanger.
4. The production device for reducing the content of the solvent oil in the butadiene rubber as claimed in claim 3, wherein the solvent oil, the butadiene and the water vapor distilled from the condensation first kettle are filtered by an oil-gas filter and then are sent to the oil-gas heat exchanger.
5. The apparatus for reducing the content of the solvent oil in the butadiene rubber as claimed in claim 1, wherein the refining system comprises a gas phase buffer tank and a crude solvent oil tank which are connected in sequence, the crude solvent oil tank receives the gas phase discharged from the gas phase buffer tank, and a gas phase inlet of the gas phase buffer tank is connected with an outlet of the gas-liquid separation tank.
6. The apparatus for reducing the content of the solvent oil in the butadiene rubber as claimed in claim 5, wherein the vacuum pump system comprises two sets of vacuum pumps connected in parallel, each set of vacuum pump comprises a water ring vacuum pump and a gas-liquid separation tank which are connected in sequence, an inlet of each water ring vacuum pump is connected with a gas phase outlet of the oil-water separation tank, and an outlet of each gas-liquid separation tank is connected with a gas phase inlet of the gas phase buffer tank.
7. The apparatus for reducing the content of mineral spirits in butadiene rubber according to claim 6, wherein said gas phase inlet of said gas phase buffer tank is further connected to said gas phase outlet of said gas-liquid separation tank.
8. A production process of a production device for reducing the content of solvent oil in butadiene rubber is characterized by comprising the following steps:
rubber in the coagulation system is coagulated by a elutriation method, and solvent oil, butadiene and water vapor distilled from a first coagulation kettle are filtered by an oil gas filter to obtain fine rubber particles;
cooling by an oil-gas heat exchanger, then entering an oil-water layering tank, introducing solvent oil into a solvent buffer tank, and discharging layered water or supplementing water to the condensation first kettle;
the oil-water layering tank with the noncondensable gas of solvent buffer tank is through the condenser condensation that empties, and the liquid phase returns the solvent buffer tank, the vapor phase buffer tank is sent to by vacuum pumping system to solvent oil, and the gaseous phase is sent into crude solvent oil tank recycle after the buffering, wherein, vacuum pumping system includes parallelly connected two sets of vacuum pumps, and every group vacuum pump is including the water ring vacuum pump and the gas-liquid separation jar that connect gradually, every water ring vacuum pump's entry respectively with the gaseous phase export of oil-water layering tank links to each other, every the export of gas-liquid separation jar respectively with the gaseous phase entry of vapor phase buffer tank links to each other.
9. The production process of the production device for reducing the content of the solvent oil in the butadiene rubber as claimed in claim 8, wherein the water is changed and the temperature is reduced for each gas-liquid separation tank periodically according to a preset time.
10. The process for producing a production apparatus for reducing the content of mineral spirits in butadiene rubber according to claim 8, wherein the liquid phase after condensation in said gas phase buffer tank is collected periodically for a predetermined time.
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Cited By (1)
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| CN114950270A (en) * | 2022-05-26 | 2022-08-30 | 宁波新溶聚企业管理合伙企业(有限合伙) | Four-kettle continuous production equipment and production method for producing solution-polymerized styrene butadiene rubber with low content of VOCs (volatile organic compounds) |
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