CN112275244A - Device and method for replacing vinyl chloride polymerization kettle - Google Patents
Device and method for replacing vinyl chloride polymerization kettle Download PDFInfo
- Publication number
- CN112275244A CN112275244A CN202011363016.0A CN202011363016A CN112275244A CN 112275244 A CN112275244 A CN 112275244A CN 202011363016 A CN202011363016 A CN 202011363016A CN 112275244 A CN112275244 A CN 112275244A
- Authority
- CN
- China
- Prior art keywords
- water
- valve
- vinyl chloride
- polymerization kettle
- discharge
- Prior art date
- 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
Images
Classifications
-
- 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
-
- 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
- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F14/02—Monomers containing chlorine
- C08F14/04—Monomers containing two carbon atoms
- C08F14/06—Vinyl chloride
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides a device and a method for vinyl chloride polymerization kettle replacement, which comprises a polymerization kettle system and a water pumping pipeline, wherein the first end of the water pumping pipeline is communicated with a discharge pump inlet pipe between a discharge pump and a second discharge ball valve, the second end of the water pumping pipeline is communicated with a mother liquor water regulating tank, and a water pumping valve is also arranged on the water pumping pipeline; according to the device and the method for replacing the vinyl chloride polymerization kettle, the conventional mode of directly pumping monomers for replacement after vacuumizing is replaced by a mother liquor water replacement mode, so that the air in the polymerization kettle 1 is completely replaced, and the potential safety hazard when vinyl chloride is directly introduced under the condition that air is in the kettle is eliminated; meanwhile, only a water fetching pipeline and a water fetching valve 17 are additionally arranged on a discharging unit of the existing polymerization kettle system, so that the system is convenient and practical and is convenient to popularize.
Description
Technical Field
The invention relates to the field of polyvinyl chloride industry, in particular to a device and a method for replacing a vinyl chloride polymerization kettle.
Background
The polymerizer is a key device in industrial production of polyvinyl chloride, and has direct influence on the quality and yield of resin products, production cost, labor conditions, safety production and the like, so that in the polyvinyl chloride industry of many countries, sufficient attention is paid to the design, manufacture and use of the polymerizer, and research and test are carried out for many years.
The structure of the existing polymerizer system is:
as shown in fig. 1: comprises a polymerization kettle 1, a vacuumizing unit, a vinyl chloride recovery unit, a vinyl chloride emptying unit and a discharging unit; a vinyl chloride feeding hole and a vinyl chloride recovery hole are formed in a polymerization kettle 1, the vinyl chloride feeding hole is used for adding vinyl chloride to the polymerization kettle 1, a gas phase main pipe is connected to the vinyl chloride recovery hole, a first butterfly valve 6 is arranged on the gas phase main pipe, the gas phase main pipe behind the first butterfly valve 6 is divided into three gas phase branch pipes, namely a vacuumizing branch pipe of a vacuumizing unit, a recovery branch pipe of the vinyl chloride recovery unit and an emptying branch pipe of a vinyl chloride emptying unit, the vacuumizing unit further comprises a vacuumizing valve 7 and a vacuum pump 2 which are arranged on the vacuumizing branch pipe, the vinyl chloride emptying unit further comprises an emptying valve 8 which is arranged on the emptying branch pipe, the vinyl chloride recovery unit further comprises a first recovery valve 9 and a second recovery valve 10 which are sequentially arranged on the recovery branch pipe, and the tail end of the; the bottom of the polymerizer 1 is provided with a discharge hole, the discharge unit comprises a discharge main pipe, a mother liquid water inlet pipe, a discharge pump inlet pipe and a discharge pump 5, one end of the discharge main pipe is communicated with the discharge hole, the discharge main pipe is provided with a plunger valve 12, the other end of the discharge main pipe is divided into the mother liquid water inlet pipe and the discharge pump inlet pipe, and the mother liquid water inlet pipe is communicated with a mother liquid water pump at the outlet of a mother liquid water tank through a feed ball valve 13 and is used for providing mother liquid water for the polymerizer 1; an inlet pipe of the discharge pump is communicated with the discharge chute 3 through a first discharge ball valve 14, the discharge pump 5 and a second discharge ball valve 15 in sequence; the top of the discharge chute 3 is also connected to a recovery branch pipe between the first recovery valve 9 and the second recovery valve 10 through a discharge chute recovery pipe, and a gas phase recovery valve 11 is arranged on the discharge chute recovery pipe; a waste water branch pipe is connected to a discharging pump inlet pipe between the discharging pump 5 and the second discharging ball valve 15, a waste water valve 16 is arranged on the waste water branch pipe, and the waste water branch pipe is connected to a waste water tank.
Since the 70m vinyl chloride polymerizing kettle 1 needs to be completely replaced by the residual air in the polymerizing kettle 1 through the vacuumizing unit after uncovering and overhauling and before putting into operation again, the pressure control of the normal reaction of the polymerizing kettle 1 is prevented from being influenced by the inert gas contained in the polymerizing kettle 1; the existing replacement method is that a water-ring vacuum pump 2 is used for pumping the pressure in a polymerization kettle 1 to-50 kPa, then 2-3 tons of liquid-phase chloroethylene is pumped into the polymerization kettle 1 through a chloroethylene feeding hole, high-pressure steam is introduced into the bottom of the polymerization kettle 1 for heating, and then a water-ring compressor is used for recovering the gasified chloroethylene in the polymerization kettle 1 to a compression recovery system for condensation; continuously introducing high-pressure steam into the polymerization kettle 1, and stopping after the liquid-phase chloroethylene in the polymerization kettle 1 is completely recovered, so that the replacement work of the polymerization kettle 1 is completed.
However, in the above-mentioned method of replacing with high-pressure steam, there may be a case where the air in the polymerizer 1 is not completely pumped by the vacuum pump 2, and in this case, when vinyl chloride is introduced into the polymerizer 1, the vinyl chloride directly contacts with the air, and the lower explosion limit of vinyl chloride gas is 3.6%, which may cause a safety hazard.
Disclosure of Invention
The invention aims to provide a device and a method for replacing a vinyl chloride polymerization kettle, which replace the conventional mode of directly pumping liquid-phase vinyl chloride for replacement after vacuumizing by using a mother liquor water replacement mode, ensure that air in the polymerization kettle is completely replaced, and eliminate the potential safety hazard when vinyl chloride is directly introduced under the condition that air is in the kettle.
In order to achieve the purpose, the invention adopts the following technical scheme:
an apparatus for vinyl chloride polymerizer replacement, comprising a polymerizer system; still including the pipeline of fetching water, the first end of pipeline of fetching water communicates with the ejection of compact pump import pipe between ejection of compact pump and the second ejection of compact ball valve, and the second end of pipeline of fetching water communicates with mother liquor water regulation pond, still is provided with the valve of fetching water on the pipeline of fetching water.
The polymerization kettle system comprises a polymerization kettle, a vinyl chloride recovery unit, a vinyl chloride emptying unit and a discharging unit.
The water valve adopts a ball valve.
A method for vinyl chloride polymerization tank replacement comprising the steps of:
step 1: opening a plunger type valve on a discharge main pipe and a feeding ball valve on a mother liquid water inlet pipe, and injecting mother liquid water into the polymerization kettle by a mother liquid water pump; simultaneously opening a first butterfly valve on the gas phase main pipe and an emptying valve on the emptying branch pipe; entering the step 2;
step 2: if mother liquor water flows out of the emptying branch pipe, a feed ball valve on the mother liquor water inlet pipe and an emptying valve on the emptying branch pipe are closed; entering the step 3;
and step 3: opening a first discharge valve on an inlet pipe of the discharge pump, the discharge pump and a water pumping valve on a water pumping pipeline, simultaneously opening a first recovery valve on a recovery branch pipe and a gas phase recovery valve on a discharge tank recovery pipe, opening a stirring motor of the polymerizer, and enabling positive pressure in the discharge tank to serially enter the polymerizer through the discharge tank recovery pipe and the recovery branch pipe; further, mother liquor in the polymerization kettle enters a mother liquor regulating tank through a water fetching pipeline under the driving of a discharge pump; when the stirring current of the stirring motor is reduced to 80-100A, closing the water pumping valve, and simultaneously opening the second discharge valve to enable the mother liquor in the polymerization kettle to enter the discharge tank;
and 4, step 4: and when the stirring current of the stirring motor is reduced to the current value when the stirring motor idles, the discharge pump and the stirring motor are closed, and the replacement process is completed.
And 3, closing the water filling valve, opening the second discharge valve, and then closing the second discharge valve and opening a waste water valve on the waste water branch pipe if the liquid level in the discharge tank is higher than the highest allowable liquid level so that the mother liquor water in the polymerization kettle flows out of the waste water branch pipe.
The invention has the beneficial effects that:
according to the device and the method for replacing the vinyl chloride polymerization kettle, the conventional mode of directly pumping monomers for replacement after vacuumizing is replaced by a mother liquor water replacement mode, so that the air in the polymerization kettle 1 is completely replaced, and the potential safety hazard when vinyl chloride is directly introduced under the condition that air is in the kettle is eliminated; meanwhile, only a water fetching pipeline and a water fetching valve 17 are additionally arranged on a discharging unit of the existing polymerization kettle system, so that the system is convenient and practical and is convenient to popularize.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a prior art polymerizer system described in the background section;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
As shown in fig. 2: the invention relates to a device for replacing a vinyl chloride polymerization kettle, which comprises a polymerization kettle system and a water pumping pipeline; the polymerization kettle system adopts the prior polymerization kettle system in the background technology; the first end of the water-fetching pipeline is communicated with the discharging pump inlet pipe between the discharging pump 5 and the second discharging ball valve 15, the second end of the water-fetching pipeline is communicated with the mother liquor water adjusting tank 18, and the water-fetching pipeline is further provided with a water-fetching valve 17.
Preferably: the polymerization kettle system comprises a polymerization kettle 1, a vinyl chloride recovery unit, a vinyl chloride emptying unit and a discharging unit; that is, the polymerizer 1 of the apparatus for vinyl chloride polymerizer replacement of the present invention does not require a vacuum pumping unit, as compared with the conventional polymerizer system.
Preferably: the water valve 17 adopts a ball valve.
The method for vinyl chloride polymerization tank replacement using the apparatus for vinyl chloride polymerization tank replacement according to the present invention comprises the steps of:
step 1: opening a plunger valve 12 on a discharge main pipe and a feed ball valve 13 on a mother liquid water inlet pipe, and injecting mother liquid water into the polymerization kettle 1 by a mother liquid water pump; simultaneously opening a first butterfly valve 6 on the gas phase main pipe and an emptying valve 8 on the emptying branch pipe; entering the step 2;
step 2: if mother liquor water flows out of the emptying branch pipe, a feed ball valve 13 on the mother liquor water inlet pipe and an emptying valve 8 on the emptying branch pipe are closed; at this time, it is indicated that the inside of the polymerizer 1 is completely filled with the mother liquid water, the air inside the polymerizer 1 is completely discharged along the emptying branch pipe, and the mother liquid water inside the polymerizer 1 is only required to be emptied before the polymerizer 1 is produced again, and the following method is adopted: entering the step 3;
and step 3: opening a first discharge valve 14 on an inlet pipe of a discharge pump, the discharge pump 5 and a water pumping valve 17 on a water pumping pipeline, simultaneously opening a first recovery valve 9 on a recovery branch pipe and a gas phase recovery valve 11 on a discharge tank recovery pipe, opening a stirring motor of the polymerizer 1, and enabling positive pressure in a discharge tank 3 to enter the polymerizer 1 through the discharge tank recovery pipe and the recovery branch pipe in series; further, mother liquor in the polymerization kettle 1 enters a mother liquor adjusting tank 18 through a water fetching pipeline under the driving of a discharge pump 5; when the stirring current of the stirring motor is reduced to between 80 and 100A, closing the water pumping valve 17, and simultaneously opening the second discharge valve to enable the mother liquor in the polymerization kettle 1 to enter the discharge tank 3; when the mother liquid water in the polymerization kettle 1 is more, the mother liquid water can be directly discharged to the mother liquid water regulating tank 18, and when the mother liquid water is less, in order to prevent the mother liquid water in the polymerization kettle 1 from being exhausted, the condition that the water pumping valve 17 is not closed in time (prevent the vinyl chloride in the kettle from entering the mother liquid water regulating tank 18 to cause vinyl chloride leakage to be dangerous) occurs, therefore, when the stirring current of the stirring motor falls to between 80 and 100A, the water pumping valve 17 is closed, and simultaneously, the second discharging valve is opened to enable the mother liquid water in the polymerization kettle 1 to enter the discharging tank 3; because the working current of the stirring motor is between 30A and 180A, 30A is the working current of the stirring motor during idling, 180A is the working current of the polymerization kettle 1 when the polymerization kettle is full, and through multiple tests, when the stirring current is reduced to 83A, the water pumping valve 17 is closed;
further, close the water valve 17, open the second bleeder valve after, if the liquid level in the blown down tank 3 is higher than the highest liquid level that allows, then close the second bleeder valve, open the waste water valve 16 on the waste water branch pipe, make the interior mother liquor water of polymeric kettle 1 flow out by the waste water branch pipe, prevent that the too high condition of liquid level from appearing in blown down tank 3.
And 4, step 4: and when the stirring current of the stirring motor is reduced to the current value when the stirring motor idles, the discharge pump 5 and the stirring motor are closed, and the replacement process is completed.
According to the device and the method for replacing the vinyl chloride polymerization kettle, the conventional mode of directly pumping monomers for replacement after vacuumizing is replaced by a mother liquor water replacement mode, so that the air in the polymerization kettle 1 is completely replaced, and the potential safety hazard when vinyl chloride is directly introduced under the condition that air is in the kettle is eliminated; meanwhile, only a water fetching pipeline and a water fetching valve 17 are additionally arranged on a discharging unit of the existing polymerization kettle system, so that the system is convenient and practical and is convenient to popularize.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. An apparatus for vinyl chloride polymerizer replacement, comprising a polymerizer system; the method is characterized in that: still including the pipeline of fetching water, the first end of pipeline of fetching water communicates with the ejection of compact pump import pipe between ejection of compact pump and the second ejection of compact ball valve, and the second end of pipeline of fetching water communicates with mother liquor water regulation pond, still is provided with the valve of fetching water on the pipeline of fetching water.
2. An apparatus for vinyl chloride polymerization kettle replacement according to claim 1, wherein: the polymerization kettle system comprises a polymerization kettle, a vinyl chloride recovery unit, a vinyl chloride emptying unit and a discharging unit.
3. An apparatus for vinyl chloride polymerization kettle replacement according to claim 1, wherein: the water valve adopts a ball valve.
4. The method for vinyl chloride polymerization vessel replacement using the apparatus for vinyl chloride polymerization vessel replacement of claim 1, comprising the steps of:
step 1: opening a plunger type valve on a discharge main pipe and a feeding ball valve on a mother liquid water inlet pipe, and injecting mother liquid water into the polymerization kettle by a mother liquid water pump; simultaneously opening a first butterfly valve on the gas phase main pipe and an emptying valve on the emptying branch pipe; entering the step 2;
step 2: if mother liquor water flows out of the emptying branch pipe, a feed ball valve on the mother liquor water inlet pipe and an emptying valve on the emptying branch pipe are closed; entering the step 3;
and step 3: opening a first discharge valve on an inlet pipe of a discharge pump, the discharge pump and a water pumping valve on a water pumping pipeline, simultaneously opening a first recovery valve on a recovery branch pipe and a gas phase recovery valve on a discharge tank recovery pipe, opening a stirring motor of the polymerizer, and enabling positive pressure in a discharge tank to enter the polymerizer through the discharge tank recovery pipe and the recovery branch pipe in series to provide power for discharging mother liquor water in the polymerizer; further, mother liquor in the polymerization kettle enters a mother liquor regulating tank through a water fetching pipeline under the driving of a discharge pump; when the stirring current of the stirring motor is reduced to 80-100A, closing the water pumping valve, and simultaneously opening the second discharge valve to enable the mother liquor in the polymerization kettle to enter the discharge tank;
and 4, step 4: and when the stirring current of the stirring motor is reduced to the current value when the stirring motor idles, the discharge pump and the stirring motor are closed, and the replacement process is completed.
5. The method for vinyl chloride polymerization kettle replacement according to claim 4, wherein: and 3, closing the water filling valve, opening the second discharge valve, and then closing the second discharge valve and opening a waste water valve on the waste water branch pipe if the liquid level in the discharge tank is higher than the highest allowable liquid level so that the mother liquor water in the polymerization kettle flows out of the waste water branch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363016.0A CN112275244A (en) | 2020-11-27 | 2020-11-27 | Device and method for replacing vinyl chloride polymerization kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011363016.0A CN112275244A (en) | 2020-11-27 | 2020-11-27 | Device and method for replacing vinyl chloride polymerization kettle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112275244A true CN112275244A (en) | 2021-01-29 |
Family
ID=74425784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011363016.0A Pending CN112275244A (en) | 2020-11-27 | 2020-11-27 | Device and method for replacing vinyl chloride polymerization kettle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112275244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115612168A (en) * | 2022-08-29 | 2023-01-17 | 山东鲁泰化学有限公司 | Secondary recovery method of polymerization kettle for polyvinyl chloride production |
-
2020
- 2020-11-27 CN CN202011363016.0A patent/CN112275244A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115612168A (en) * | 2022-08-29 | 2023-01-17 | 山东鲁泰化学有限公司 | Secondary recovery method of polymerization kettle for polyvinyl chloride production |
| CN115612168B (en) * | 2022-08-29 | 2023-06-06 | 山东鲁泰化学有限公司 | Secondary recycling method of polymerization kettle for polyvinyl chloride production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112275244A (en) | Device and method for replacing vinyl chloride polymerization kettle | |
| CN213854559U (en) | Device for replacing vinyl chloride polymerization kettle | |
| CN110038503B (en) | Synthesis process system and method of fluororubber | |
| CN114471407A (en) | Production system and method for producing EVA (ethylene vinyl acetate) by multi-kettle-tubular series-parallel continuous polymerization | |
| CN201545792U (en) | Safe separation and recovery unit for acetylene and carbide slag in dry acetylene generator | |
| CN210182198U (en) | Online full-automatic oil filter | |
| CN106422951A (en) | Intelligent blending system | |
| CN104098721B (en) | A kind of polyethylene fluidized-bed reactor seed bed is loaded and treatment system and method | |
| CN213725655U (en) | Liquefied gas washing device | |
| CN220736321U (en) | Cyclohexane feed liquid recovery unit | |
| CN201842792U (en) | Acrylic copolymer (ACR) emulsion polymerization oxygen removal nitrogen sealing device | |
| WO2007122452A1 (en) | Apparatus for producing carbon monoxide by a chemical reaction process | |
| CN111549222A (en) | Intelligent control system and method for U-shaped ion exchange tower | |
| CN112661875B (en) | Continuous pretreatment device for pre-polymerized liquid, pretreatment method and emergency treatment method thereof | |
| CN220590044U (en) | Catalyst regeneration system in hexamethylenediamine continuous production process | |
| CN219922884U (en) | Neutralizing agent adding device | |
| CN214765318U (en) | Accurate feeding equipment of biochemical industry reaction liquid | |
| CN217526414U (en) | Device for removing residual liquid without stopping working in chemical production process | |
| CN219796921U (en) | Wastewater discharge system of polyethylene hexane recovery tank | |
| CN219399050U (en) | Degassing device in organic synthesis | |
| CN220110929U (en) | Granular material dissolving device | |
| CN217140321U (en) | Exhaust valve device for outlet of cracking feed pump | |
| CN118290606A (en) | Method for extracting dendrobium candidum polysaccharide based on supercritical extraction method | |
| CN212731150U (en) | Polymer separator of synthetic tower | |
| CN114195189B (en) | Preparation process of chromium oxyhydroxide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |