CN111821937A - Be applicable to PVC paste resin safety in production equipment - Google Patents
Be applicable to PVC paste resin safety in production equipment Download PDFInfo
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- CN111821937A CN111821937A CN202010733509.2A CN202010733509A CN111821937A CN 111821937 A CN111821937 A CN 111821937A CN 202010733509 A CN202010733509 A CN 202010733509A CN 111821937 A CN111821937 A CN 111821937A
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- control valve
- fixed mounting
- paste resin
- production equipment
- pvc paste
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- 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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
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- 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
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0053—Details of the reactor
- B01J19/0073—Sealings
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- 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
- B01J4/008—Feed or outlet control devices
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- 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
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
- B01J2219/00056—Controlling or regulating the heat exchange system involving measured parameters
- B01J2219/00058—Temperature measurement
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- 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
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00054—Controlling or regulating the heat exchange system
- B01J2219/00056—Controlling or regulating the heat exchange system involving measured parameters
- B01J2219/00065—Pressure measurement
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- 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
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/00074—Controlling the temperature by indirect heating or cooling employing heat exchange fluids
- B01J2219/00076—Controlling the temperature by indirect heating or cooling employing heat exchange fluids with heat exchange elements inside the reactor
- B01J2219/00081—Tubes
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- 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
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
- B01J2219/0015—Controlling the temperature by thermal insulation means
- B01J2219/00155—Controlling the temperature by thermal insulation means using insulating materials or refractories
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- 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
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00162—Controlling or regulating processes controlling the pressure
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to the technical field of paste resin production, and discloses safe production equipment suitable for PVC paste resin. This be applicable to PVC paste resin safety in production equipment, through A control valve, the setting of unloading pipe and reserve cauldron, the reation kettle in the polymerization takes place the excess temperature superpressure, can emergent pressure release to reserve cauldron, improve device production security, also greatly reduced risk and loss, through B control valve, the sampling tube, the setting of D control valve and sampling bottle, the resin of having made things convenient for at any time in to reation kettle takes the area sample, the risk of having avoided uncapping the sample to bring, through the setting of double-layered sleeve wall and inlet tube, can lead to hot water or five degrees water and realize rising and reducing the reation kettle temperature, avoid producing the excess temperature phenomenon.
Description
Technical Field
The invention relates to the technical field of PVC paste resin production, in particular to safe production equipment suitable for PVC paste resin.
Background
Polyvinyl chloride (PVC) paste resins, as their name implies, are mainly used in the form of pastes, which are commonly referred to as plastisols, which are a unique liquid form of raw PVC plastic, paste resins are often prepared by emulsion and microsuspension processes, which are non-flowable due to their fine particle size and texture like talc, and which are mixed with plasticizers and stirred to form stable suspensions, i.e. PVC pastes, or PVC plastisols, which are used in this form for the manufacture of end products, to which, during the pasting process, various fillers, diluents, heat stabilizers, blowing agents, light stabilizers, etc. are added according to the needs of the product.
In the process of paste resin polymerization, due to various abnormal conditions such as deviation of the addition amount of an initiator, abnormal chilled water of a jacket of a polymerization kettle and the like, an over-temperature and over-pressure phenomenon may occur in the polymerization kettle, accidents are avoided or enlarged through steps of recovering, adding a terminator, emptying, acting a safety valve and the like in the original process flow, the safety of the device is guaranteed, and in addition, frequent start-stop operation of production can bring safety risks, environmental pollution and economic loss.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the safe production equipment suitable for the PVC paste resin, which has the advantages of safety, convenience in sampling and the like, and solves the problems in the background technology.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a safe production device suitable for PVC paste resin comprises an outer shell and a reaction kettle, wherein the inner wall of the outer shell is provided with a heat-insulating layer, a jacket wall is fixedly arranged on the inner wall of the heat-insulating layer, a reaction kettle is arranged on one side of the jacket wall, a kettle cover is fixedly arranged on the upper surface of the reaction kettle, a fixed frame is fixedly arranged in the middle of the upper surface of the kettle cover, a servo motor is fixedly arranged in the fixing frame, a stirring rod is fixedly arranged at the output end of the servo motor, a discharging pipe is fixedly arranged on the lower surface of the reaction kettle, a control valve A, a control valve B and a control valve C are fixedly arranged on the outer surface of the discharging pipe from top to bottom in sequence, a discharge pipe is fixedly arranged on one side of the control valve A, one end of the discharge pipe is fixedly connected with a spare kettle, one side fixed mounting of B control valve has the sampling tube, one side fixed mounting of sampling tube surface has the D control valve.
Preferably, a circulating water tank is arranged in the jacket wall, a water inlet pipe communicated with the circulating water tank is fixedly mounted on one side of the upper surface of the jacket wall, a water discharge pipe is fixedly mounted on the lower surface of the jacket wall, and an E control valve is arranged on one side of the water discharge pipe.
Preferably, the equal fixed mounting in four corners department of shell body lower surface has the supporting leg, and wherein one side fixed mounting of two supporting legs has the backup pad, the standing groove has been seted up at the middle part of backup pad upper surface, the inside of standing groove is provided with the sample bottle.
Preferably, the upper surface of the outer shell is fixedly provided with a cover plate, and one side of the upper surface of the kettle cover is fixedly provided with a thermal couple.
Preferably, one side of the outer surface of the kettle cover is fixedly provided with a liquid phase valve, and one end of the liquid phase valve is fixedly provided with a liquid phase pipe.
Preferably, the other side of the outer surface of the kettle cover is fixedly provided with a pressure measuring pipe, one end of the pressure measuring pipe is fixedly provided with a pressure gauge, and the middle part of the outer surface of the pressure measuring pipe is fixedly provided with a rupture disc device.
Preferably, the outer surface of the fixing frame is fixedly provided with a protective shell, the outer surface of the protective shell is provided with a heat dissipation window, and the inner wall of the heat dissipation window is provided with a filter disc.
Preferably, the outer surface of the reaction kettle is provided with a feed inlet, and the outer surface of the feed inlet is fixedly provided with a sealing cover.
(III) advantageous effects
Compared with the prior art, the invention provides the safe production equipment suitable for the PVC paste resin, and the safe production equipment has the following beneficial effects:
1. this be applicable to PVC paste resin safety in production equipment, through the setting of A control valve, unloading pipe and reserve cauldron, the reation kettle in the polymerization takes place the super temperature superpressure, can emergent pressure release to reserve cauldron, improves device production security, also greatly reduced risk and loss.
2. This be applicable to PVC paste resin safety in production equipment, through the setting of B control valve, sampling tube, D control valve and sampling bottle, made things convenient for at any time to take the area to take a sample to the resin in the reation kettle, avoided the risk that the sample of uncapping brought.
3. This be applicable to PVC paste resin safety in production equipment, through the setting of double-layered sleeve wall and inlet tube, can lead to hot water or five degrees of water and realize rising and reducing the reation kettle temperature, avoid producing the overtemperature prote phenomenon.
Drawings
FIG. 1 is a schematic perspective view of a safety production apparatus for PVC paste resin according to the present invention;
FIG. 2 is a schematic plan view of the outer shell structure of the PVC paste resin safety production equipment provided by the invention;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2 of the safety production apparatus for PVC paste resin according to the present invention;
FIG. 4 is an enlarged schematic view of a structure at B in FIG. 2 of the safety production equipment for PVC paste resin according to the present invention.
In the figure: 1. an outer housing; 2. a reaction kettle; 3. a heat-insulating layer; 5. a jacket wall; 6. a kettle cover; 7. a fixed mount; 8. a servo motor; 9. a stirring rod; 10. discharging the material pipe; 11. a, controlling a valve; 12. b, controlling a valve; 13. C, controlling a valve; 14. a discharging pipe; 15. a standby kettle; 16. a sampling tube; 17. a D control valve; 18. a circulating water tank; 19. a water inlet pipe; 20. a drain pipe; 21. e, controlling a valve; 22. supporting legs; 23. a support plate; 24. sampling a bottle; 25. a cover plate; 26. a thermal couple; 27. a liquid phase valve; 28. a liquid phase pipe; 29. a piezometric tube; 30. a pressure gauge; 31. a rupture disc device; 32. a protective housing; 33. and (7) sealing the cover.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a safe production device suitable for PVC paste resin comprises an outer shell 1 and a reaction kettle 2, wherein an insulating layer 3 is arranged on the inner wall of the outer shell 1, a jacket wall 5 is fixedly arranged on the inner wall of the insulating layer 3, the reaction kettle 2 is arranged on one side of the jacket wall 5, a kettle cover 6 is fixedly arranged on the upper surface of the reaction kettle 2, a fixing frame 7 is fixedly arranged in the middle of the upper surface of the kettle cover 6, a servo motor 8 is fixedly arranged in the fixing frame 7, a stirring rod 9 is fixedly arranged at the output end of the servo motor 8, a discharging pipe 10 is fixedly arranged on the lower surface of the reaction kettle 2, an a control valve 11, a control valve B12 and a control valve C13 are fixedly arranged on the outer surface of the discharging pipe 10 from top to bottom in sequence, a discharging pipe 14 is fixedly arranged on one side of the control valve a control valve 11, The setting of the blanking pipe 14 and the spare kettle 15, when the reaction kettle in the polymerization generates overtemperature and overpressure, the pressure can be emergently released to the spare kettle, the production safety of the device is improved, and the risk and the loss are greatly reduced, a sampling pipe 16 is fixedly installed at one side of a B control valve 12, a D control valve 17 is fixedly installed at one side of the outer surface of the sampling pipe 16, the resin in the reaction kettle 2 can be conveniently sampled under pressure at any time through the setting of the B control valve 12, the sampling pipe 16, the D control valve 17 and a sampling bottle 24, the risk brought by uncapping sampling is avoided, a circulating water tank 18 is arranged inside a jacket wall 5, a water inlet pipe 19 communicated with the circulating water tank 18 is fixedly installed at one side of the upper surface of the jacket wall 5, the temperature of the reaction kettle 2 can be raised and lowered by hot water or five-degree water through the setting of the jacket wall 5 and the water inlet pipe 19, the overtemperature phenomenon is avoided, a drain pipe, one side of the drain pipe 20 is provided with an E control valve 21, four corners of the lower surface of the outer shell 1 are fixedly provided with supporting legs 22, one side of two supporting legs 22 is fixedly provided with a supporting plate 23, the middle part of the upper surface of the supporting plate 23 is provided with a placing groove, a sampling bottle 24 is arranged inside the placing groove, the upper surface of the outer shell 1 is fixedly provided with a cover plate 25, one side of the upper surface of the kettle cover 6 is fixedly provided with a thermal couple 26, one side of the outer surface of the kettle cover 6 is fixedly provided with a liquid phase valve 27, one end of the liquid phase valve 27 is fixedly provided with a liquid phase pipe 28, the other side of the outer surface of the kettle cover 6 is fixedly provided with a pressure measuring pipe 29, one end of the pressure measuring pipe 29 is fixedly provided with a pressure gauge 30, the middle part of the outer surface of the pressure measuring pipe 29 is fixedly provided with, the outer surface of reaction kettle 2 is provided with a feed inlet, and the outer surface of the feed inlet is fixedly provided with a sealing cover 33.
The electrical components in the paper are all electrically connected with an external master controller and 380V industrial electricity, and the master controller can be a computer and other conventional known devices for controlling.
When the automatic feeding device is used, the sealing cover 33 can be opened through the access, the feeding is carried out in the reaction kettle 2, after the feeding is completed, the servo motor 8 is opened, the stirring rod 9 is driven to work, meanwhile, the temperature of the reaction kettle 2 can be adjusted through hot water or five-degree water, when the sampling is needed, the B control valve 12 is opened, the discharging pipe 10 is communicated with the sampling pipe 16, resin enters the sampling pipe 16 through the discharging pipe 10, then the B control valve 12 is closed, the D control valve 17 is opened, the resin in the sampling pipe 16 enters the sampling bottle 24, the operation of sampling under pressure is realized, the A control valve 11 can be opened when the reaction kettle 2 is abnormal, the discharging pipe 10 is communicated with the discharging pipe 14, the resin in the reaction kettle 2 enters the standby kettle 15 through the discharging pipe 14, and unnecessary feeding loss is avoided.
To sum up, this be applicable to PVC paste resin safety in production equipment, through A control valve 11, the setting of unloading pipe 14 and reserve cauldron 15, the super temperature superpressure takes place for reation kettle in the polymerization, can emergent pressure release to reserve cauldron, improve device production safety nature, also greatly reduced risk and loss, through B control valve 12, sampling tube 16, the setting of D control valve 17 and sampling bottle 24, it takes a sample to have made things convenient for the resin in reation kettle 2 to take pressure at any time, the risk that the sample of uncapping brought has been avoided, through the setting of double-layered wall 5 and inlet tube 19, can lead to rising and the reduction of hot water or five degree water realization to reation kettle 2 temperature, avoid producing the overtemperature phenomenon.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a be applicable to PVC paste resin safety in production equipment, includes shell body (1) and reation kettle (2), its characterized in that: the inner wall of the outer shell (1) is provided with a heat preservation layer (3), the inner wall fixed mounting of the heat preservation layer (3) is provided with a jacket wall (5), one side of the jacket wall (5) is provided with a reaction kettle (2), the upper surface fixed mounting of the reaction kettle (2) is provided with a kettle cover (6), the middle part of the upper surface of the kettle cover (6) is fixedly provided with a fixing frame (7), the inside fixed mounting of the fixing frame (7) is provided with a servo motor (8), the output end fixed mounting of the servo motor (8) is provided with a stirring rod (9), the lower surface fixed mounting of the reaction kettle (2) is provided with a discharging pipe (10), the outer surface of the discharging pipe (10) is sequentially and fixedly provided with an A control valve (11), a B control valve (12) and a C control valve (13) from top to bottom, one side of the A control valve, one end fixedly connected with spare cauldron (15) of unloading pipe (14), one side fixed mounting of B control valve (12) has sampling tube (16), one side fixed mounting of sampling tube (16) surface has D control valve (17).
2. The PVC paste resin safety production equipment according to claim 1, characterized in that: the circulating water tank (18) is arranged in the jacket wall (5), a water inlet pipe (19) communicated with the circulating water tank (18) is fixedly mounted on one side of the upper surface of the jacket wall (5), a water discharge pipe (20) is fixedly mounted on the lower surface of the jacket wall (5), and an E control valve (21) is arranged on one side of the water discharge pipe (20).
3. The PVC paste resin safety production equipment according to claim 1, characterized in that: the all fixed mounting in four corners department of shell body (1) lower surface has supporting leg (22), and wherein one side fixed mounting of two supporting legs (22) has backup pad (23), the standing groove has been seted up at the middle part of backup pad (23) upper surface, the inside of standing groove is provided with sampling bottle (24).
4. The PVC paste resin safety production equipment according to claim 1, characterized in that: the upper surface fixed mounting of shell body (1) has apron (25), one side fixed mounting of kettle cover (6) upper surface has thermal couple (26).
5. The PVC paste resin safety production equipment according to claim 1, characterized in that: one side fixed mounting of kettle cover (6) surface has liquid phase valve (27), the one end fixed mounting of liquid phase valve (27) has liquid phase pipe (28).
6. The PVC paste resin safety production equipment according to claim 1, characterized in that: the pressure measuring pipe is characterized in that a pressure measuring pipe (29) is fixedly mounted on the other side of the outer surface of the kettle cover (6), a pressure gauge (30) is fixedly mounted at one end of the pressure measuring pipe (29), and a rupture disc device (31) is fixedly mounted in the middle of the outer surface of the pressure measuring pipe (29).
7. The PVC paste resin safety production equipment according to claim 1, characterized in that: the outer fixed surface of mount (7) installs protecting sheathing (32), the heat dissipation window has been seted up to the surface of protecting sheathing (32), the inner wall of heat dissipation window is provided with the filter disc.
8. The PVC paste resin safety production equipment according to claim 1, characterized in that: the outer surface of reaction kettle (2) is provided with a feed inlet, and the outer surface of feed inlet is fixedly provided with a sealing cover (33).
Priority Applications (1)
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CN202010733509.2A CN111821937A (en) | 2020-07-27 | 2020-07-27 | Be applicable to PVC paste resin safety in production equipment |
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CN202010733509.2A CN111821937A (en) | 2020-07-27 | 2020-07-27 | Be applicable to PVC paste resin safety in production equipment |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781213A (en) * | 1970-10-21 | 1973-12-25 | Snia Viscosa | Method for the preparation of homogeneous meterable pastes and suspensions of phthalic acids and glycols,for feeding plants,more particularly continuous esterification plants |
JPH07204498A (en) * | 1994-01-14 | 1995-08-08 | Tlv Co Ltd | Low temperature heating apparatus |
CN1857767A (en) * | 2005-11-02 | 2006-11-08 | 中国科学院过程工程研究所 | Multifunctional reactor for preparing ionic liquid |
CN202376983U (en) * | 2011-11-25 | 2012-08-15 | 中国石油天然气股份有限公司 | Multifunctional reactor for preparing hexene-1 catalyst |
CN105944646A (en) * | 2016-06-25 | 2016-09-21 | 余林岚 | Chemical reaction kettle used for processing of anaerobic adhesive |
CN108671873A (en) * | 2018-05-08 | 2018-10-19 | 王滨波 | A kind of auger reaction kettle of high-efficiency heating |
CN109289745A (en) * | 2018-12-07 | 2019-02-01 | 杭州纳尔森精细化工有限公司 | A kind of explosion-proof reaction kettle of chemical industry preparation |
CN208894220U (en) * | 2018-09-26 | 2019-05-24 | 河南泰利杰生物科技有限公司 | A kind of polydextrose auto-polymerization reaction unit |
CN109939635A (en) * | 2019-04-11 | 2019-06-28 | 淄博询知方技术开发有限公司 | A kind of highly effective reaction kettle facilitating sampling |
-
2020
- 2020-07-27 CN CN202010733509.2A patent/CN111821937A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781213A (en) * | 1970-10-21 | 1973-12-25 | Snia Viscosa | Method for the preparation of homogeneous meterable pastes and suspensions of phthalic acids and glycols,for feeding plants,more particularly continuous esterification plants |
JPH07204498A (en) * | 1994-01-14 | 1995-08-08 | Tlv Co Ltd | Low temperature heating apparatus |
CN1857767A (en) * | 2005-11-02 | 2006-11-08 | 中国科学院过程工程研究所 | Multifunctional reactor for preparing ionic liquid |
CN202376983U (en) * | 2011-11-25 | 2012-08-15 | 中国石油天然气股份有限公司 | Multifunctional reactor for preparing hexene-1 catalyst |
CN105944646A (en) * | 2016-06-25 | 2016-09-21 | 余林岚 | Chemical reaction kettle used for processing of anaerobic adhesive |
CN108671873A (en) * | 2018-05-08 | 2018-10-19 | 王滨波 | A kind of auger reaction kettle of high-efficiency heating |
CN208894220U (en) * | 2018-09-26 | 2019-05-24 | 河南泰利杰生物科技有限公司 | A kind of polydextrose auto-polymerization reaction unit |
CN109289745A (en) * | 2018-12-07 | 2019-02-01 | 杭州纳尔森精细化工有限公司 | A kind of explosion-proof reaction kettle of chemical industry preparation |
CN109939635A (en) * | 2019-04-11 | 2019-06-28 | 淄博询知方技术开发有限公司 | A kind of highly effective reaction kettle facilitating sampling |
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Application publication date: 20201027 |