CN217188035U - Defoaming production device for suspension-method polyvinyl chloride resin process reaction system - Google Patents
Defoaming production device for suspension-method polyvinyl chloride resin process reaction system Download PDFInfo
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- CN217188035U CN217188035U CN202220350443.3U CN202220350443U CN217188035U CN 217188035 U CN217188035 U CN 217188035U CN 202220350443 U CN202220350443 U CN 202220350443U CN 217188035 U CN217188035 U CN 217188035U
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Abstract
The utility model discloses a defoaming production device of a suspension polyvinyl chloride resin process reaction system, which comprises a polymerization kettle, a 360-degree rotary spray head, a defoaming agent spray pipe pneumatic valve, a defoaming agent storage tank blanking pump, a defoaming agent storage tank blanking valve, a defoaming agent storage tank, a water injection pipe, a water injection regulating valve, a water injection cut-off valve, a DCS automatic control system and a level type liquid level meter; a 360-degree rotary spray head and a material level type liquid level meter are arranged in the polymerization kettle; a defoaming agent spray pipe is arranged at the bottleneck of the polymerization kettle; an outlet of the defoaming agent storage tank is provided with a defoaming agent storage tank blanking pump and a defoaming agent storage tank blanking valve; the DCS automatic control system is connected with the level type liquid level meter, the defoaming agent spray pipe pneumatic valve, the defoaming agent storage tank blanking valve and the defoaming agent storage tank in real time. The method has the advantages of realizing the function of quantitatively eliminating the foam in the polymerization reaction process, reducing the entrainment condition of the foam in the polymerization reaction system, reducing the blocking frequency and being applicable to the field of suspension method polyvinyl chloride production and manufacture.
Description
Technical Field
The utility model belongs to the technical field of suspension method polyvinyl chloride resin technology production, especially, relate to a suspension method polyvinyl chloride resin technology reaction system defoaming apparatus for producing.
Background
In the suspension method polyvinyl chloride resin production process, due to the surface tension of the dispersing agent in the polymerization reaction system, foams are generated along with the shearing and circulating action of a polymerization kettle stirring device, and the foams are suspended on the liquid surface of the reaction system after being generated. During the reaction, the gas-phase chloroethylene monomer passes through the liquid layer to a reflux condenser, is condensed into a liquid state and then flows back to the reaction system. The generation of foam is disadvantageous to the suspension process of polyvinyl chloride resin production, which is mainly characterized in that:
1. the polymerization reaction period is prolonged, and a large amount of gas-phase vinyl chloride monomer is retained in a liquid layer due to the foam generated and suspended on the liquid surface of the reaction system, so that the polymerization reaction period is prolonged.
2. In the reflux process of the gas-phase chloroethylene monomer, foams enter the condenser along with the gas-phase monomer entrained slurry, and the condenser tube nest is easy to block after long-term operation.
3. The condenser tube nest is removed physically, namely the condenser is disassembled after the kettle is stopped, the tube nest is cleaned by a cleaning tool, the consumed time is long, the productivity of the polymerization kettle is reduced, the surface smoothness of the tube nest is reduced by manual cleaning, and the tube nest blockage condition is more serious.
In order to reduce the adverse effect caused by the foam generation in the production process of the polyvinyl chloride resin by the suspension method and ensure the service life of a polyvinyl chloride resin production device, the foam generated in the production process of the polyvinyl chloride resin is eliminated by adding the defoaming agent. The mechanism is that the defoaming agent diffuses in the foam to form a double-layer film on the foam wall and reduce the local surface tension of the foam, the reduction of the surface tension is limited to the local part of the foam, the surrounding surface tension is almost kept unchanged, the part with low surface tension continuously pulls and extends to the periphery to destroy the self-healing effect of the foam, so that the foam is broken, and the defoaming agent molecules which are insoluble in a polymerization reaction system enter another foam wall again after the foam is broken, and the process is repeated until the foam is eliminated.
The currently used defoaming agent 202 belongs to a self-emulsifying defoaming agent, can be rapidly diffused in a system, has the characteristics of high durability, excellent defoaming performance and the like, but has poor foam inhibition performance and can not continuously inhibit the generation of foam.
1. The organosilicon defoamer is incompatible with PVC, most of organosilicon components are removed to mother liquor water in the centrifugal dehydration process, and dry organosilicon brought in can increase the dryness and fluidity of PVC, but influences the welding performance and the transparency of PVC products.
2. Polyether type defoaming agent, polyether and PVC are compatible, the polyether after steam stripping can gather on the surface of PVC particles, the centrifugal machine dehydration can not run off, and finally the polyether can be brought into the product, so that the unit consumption of chloroethylene is reduced, the polyether can increase the processing plasticity of PVC, and the influence on the transparency of the product is very small.
3. The polyether modified organic silicon defoaming agent has the advantages of both the polyether modified organic silicon defoaming agent and the organic silicon defoaming agent, can well play a defoaming role at high temperature, but has higher price and larger influence on the production cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a suspension method polyvinyl chloride resin technology reaction system defoaming apparatus for producing. In polyvinyl chloride resin polymerization reaction system, should add the closest point in foamingpoint with the defoaming agent, through add novel level formula level gauge at the polymeric kettle cauldron top, detect the interior thick liquids foam condition of polymeric reaction system constantly to through the chain defoaming of injecting quantitative defoaming agent into the polymeric kettle of fire fighting equipment, with defoaming and the condensation process apparatus for producing of the condition of smuggleing secretly of the interior thick liquids foam of reduction polymeric kettle.
In order to solve the above problem, the utility model adopts the following technical scheme: a defoaming method for a suspension method polyvinyl chloride resin process reaction system. The method comprises the following steps:
and 3, detecting the foam liquid level of the polymerization reaction system in real time by the DCS automatic control system by using the novel level type liquid level meter, wherein the interlock value of the foam liquid level of the polymerization reaction system detected by the level type liquid level meter is higher than a bottom probe of the level type liquid level meter.
And 4, starting a defoaming agent spray pipe pneumatic valve by the DCS automatic control system, directly extracting a fixed amount of defoaming agent in a defoaming agent storage tank 7, injecting 0.5-0.8g of defoaming agent into the polymerization reaction system in the polymerization kettle when the liquid level exceeds 1% of the liquid level of the bottom probe of the novel level gauge, and spraying defoaming agent liquid onto the foam of the polymerization reaction system to reduce the foam amount of the polymerization reaction system.
The step 3 and the step 4 can be performed at any time in the reaction if the conditions are met.
And 5, when the reaction temperature and the pressure are the highest values, executing the step 4, increasing the amount of the defoaming agent in the kettle to 1.5 times, and increasing the amount of the defoaming agent liquid sprayed on the foam of the polymerization reaction system to reduce the amount of the foam of the polymerization reaction system.
The defoaming agent selected in the step is a polyether modified organic silicon defoaming agent.
The production device for realizing the defoaming method of the suspension polyvinyl chloride resin process reaction system comprises a polymerization kettle, a 360-degree rotary spray head, a defoaming agent spray pipe pneumatic valve, a defoaming agent storage tank blanking pump, a defoaming agent storage tank blanking valve, a defoaming agent storage tank, a water injection pipe, a water injection regulating valve, a water injection cut-off valve, a DCS automatic control system and a material level type liquid level meter; a 360-degree rotary spray head and a material level type liquid level meter are arranged in the polymerization kettle; a defoaming agent spray pipe is arranged at the bottleneck of the polymerization kettle; an outlet of the defoaming agent storage tank is provided with a defoaming agent storage tank blanking pump and a defoaming agent storage tank blanking valve; the DCS automatic control system is connected with the level type liquid level meter, the defoaming agent spray pipe pneumatic valve, the defoaming agent storage tank blanking pump, the defoaming agent storage tank blanking valve and the defoaming agent storage tank in real time.
Furthermore, the device provided by the embodiment of the invention further comprises a level type liquid level meter, wherein the level type liquid level meter is additionally arranged at the top end of the polymerization kettle, a probe at the bottom of the level type liquid level meter is inserted into the polymerization kettle, and the setting position of the level type liquid level meter is set according to the production reaction pressure, the reaction temperature and the equipment design condition.
The defoaming agent spray pipe is arranged at the outlet of the defoaming agent storage tank, and a defoaming agent spray pipe pneumatic valve is arranged on the defoaming agent spray pipe.
The water injection pipe is provided with a water injection regulating valve and a water injection stop valve, the initial end of the water injection pipe is connected into the polymerization kettle, and the end head of the water injection pipe is provided with a 360-degree rotary spray head.
The starting end of the defoaming agent spray pipe is communicated with the starting end of the water injection pipe, the defoaming agent spray pipe and the water injection pipe are parallel to form a branch pipe, and a 360-degree rotary spray head is arranged at the starting end.
The device is connected with the device acquisition point through a DCS automatic control system through a communication line and is arranged in a centralized control operation station of the DCS automatic control system.
To sum up, the embodiment of the utility model provides a suspension method polyvinyl chloride resin technology reaction system defoaming method, through DCS automatic control system and material level type level gauge according to production reaction pressure, temperature, liquid level etc. condition setting chain, simultaneously with midway water injection side by side enter, prevented the jam of defoaming agent pipeline effectively, simultaneously more effectively reduce the foam that produces in the suspension method polyvinyl chloride production process, reduce the entrainment condition of polymerization thick liquids foam, reduce condenser shell and tube jam frequency, improve the polymerizer productivity; the polyether modified organic silicon defoaming agent is more effective, has the advantages of both the polyether type defoaming agent and the organic silicon defoaming agent, can well play a defoaming role at high temperature, and is worthy of popularization for product quality and subsequent processing effect although the price is relatively high.
Drawings
FIG. 1 is a schematic diagram of a defoaming production device for a suspension-process reaction system of a polyvinyl chloride resin process according to the novel embodiment;
in FIG. 1, 1 is a polymerizer; 2 is a 360-degree rotary spray head; 3 is a defoaming agent spray pipe; 4, a defoaming agent spray pipe pneumatic valve; 5 is a feeding pump of a defoaming agent storage tank; 6 is a discharging valve of the defoaming agent storage tank; 7 is an antifoaming agent storage tank; 8 is a water injection pipe; 9 is a water injection regulating valve; 10 is a water injection cut-off valve; 11 is DCS automatic control system; 12 is a level gauge.
FIG. 2 is a schematic flow chart of a defoaming method for a suspension polyvinyl chloride resin process reaction system according to an embodiment of the present invention.
Detailed Description
The embodiment of the utility model aims at providing a suspension method polyvinyl chloride resin technology reaction system defoaming method, according to suspension polymerization system bubbling time, the bubble volume, the foam size does not have accurate law, need not add the defoaming agent when not bubbling, consequently, adopt the defoaming agent automatic control to add and set up chain program, add polyether modified organic silicon defoaming agent, it is higher than the setting value to detect the foam height as level gauge, after midway water injection pipeline pours into the Xuan defoaming agent, pour into the polymeric kettle into through polymerization midway water injection shower nozzle, in reaction peak period, add the defoaming agent with the multiplying power, in order to realize eliminating the effect of foam with the ration in the polymerization process, the condition of smuggleing secretly of polymerization system foam has been alleviateed, the jam frequency of condenser tubulation has been reduced, the polymeric kettle productivity is improved. The following description is made in conjunction with the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, in order to solve the above problems, the present invention adopts the following technical solutions: a defoaming method for a suspension method polyvinyl chloride resin process reaction system. The method comprises the following steps:
and 3, detecting the foam liquid level of the polymerization reaction system in real time by the DCS automatic control system by using the novel level type liquid level meter 12, wherein the interlock value of the foam liquid level of the polymerization reaction system detected by the level type liquid level meter 12 is higher than the bottom probe of the level type liquid level meter 12.
And 4, starting a defoaming agent spray pipe pneumatic valve 4 by the DCS automatic control system, directly extracting a fixed amount of defoaming agent in a defoaming agent storage tank 7, injecting 0.5-0.8g of defoaming agent into the polymerization reaction system in the polymerization kettle when the liquid level exceeds 1% of the liquid level of a probe at the bottom of the novel level gauge, and spraying defoaming agent liquid onto the foam of the polymerization reaction system to reduce the foam amount of the polymerization reaction system.
The step 3 and the step 4 can be performed at any time in the reaction if the conditions are met.
And 5, when the reaction temperature and the pressure are the highest values, executing the step 4, increasing the amount of the defoaming agent in the kettle to 1.5 times, and increasing the amount of the defoaming agent liquid sprayed on the foam of the polymerization reaction system to reduce the amount of the foam of the polymerization reaction system.
The defoaming agent selected in the step is a polyether modified organic silicon defoaming agent.
The production device for realizing the defoaming method of the suspension polyvinyl chloride resin process reaction system comprises a polymerization kettle 1, a 360-degree rotating nozzle 2, a defoaming agent spray pipe 3, a defoaming agent spray pipe pneumatic valve 4, a defoaming agent storage tank blanking pump 5, a defoaming agent storage tank blanking valve 6, a defoaming agent storage tank 7, a water injection pipe 8, a water injection regulating valve 9, a water injection cut-off valve 10, a DCS automatic control system 11 and a material level type liquid level meter 12; a 360-degree rotary spray head 2 and a material level type liquid level meter 12 are arranged in the polymerization kettle 1; a defoaming agent spray pipe 3 is arranged at the bottleneck of the polymerization kettle 1; an outlet of the defoaming agent storage tank 7 is provided with a defoaming agent storage tank blanking pump 5 and a defoaming agent storage tank blanking valve 6; the DCS automatic control system 11 collects the position type liquid level meter 12 in real time, the defoaming agent spray pipe pneumatic valve 4, the defoaming agent storage tank blanking pump 5, the defoaming agent storage tank blanking valve 6 and the defoaming agent storage tank 7 are connected.
Further, the device of the embodiment of the invention further comprises a level type liquid level meter 12, wherein the level type liquid level meter 12 is additionally arranged at the top end of the polymerization kettle 1, a probe at the bottom of the level type liquid level meter 12 is inserted into the polymerization kettle 1, and the arrangement position of the level type liquid level meter is arranged according to the production reaction pressure, the reaction temperature and the equipment design condition.
And the defoaming agent spray pipe 3 is arranged at the outlet of the defoaming agent storage tank 7, and a defoaming agent spray pipe pneumatic valve 4 is arranged on the defoaming agent spray pipe.
The water injection pipe 8 is provided with a water injection regulating valve 9 and a water injection cut-off valve 10, the starting end of the water injection pipe 8 is connected into the polymerization kettle 1, and the end head of the water injection pipe is provided with a 360-degree rotary nozzle 2. Sprinkling water can be uniformly sprayed, so that the reaction system is more stable.
The starting end of the defoaming agent spray pipe 3 is communicated with the starting end of the water injection pipe 8 and is parallel to the water injection pipe 8, and the starting end of the defoaming agent spray pipe is provided with a 360-degree rotary spray head 2. The Se defoaming agent can be uniformly sprayed, so that the reaction system is more stable.
The device is connected with the acquisition point of the device through a DCS automatic control system 11 through a communication line and is arranged in a centralized control operation station of the DCS automatic control system. The state of the device is collected in real time, so that the foam of a polymerization reaction system is guaranteed to be sprayed with liquid, and the foam amount of the polymerization reaction system is reduced.
To sum up, the embodiment of the utility model provides a suspension method polyvinyl chloride resin process reaction system defoaming apparatus for producing, through DCS automatic control system 11 and material level type level gauge 12 according to conditions such as production reaction pressure, temperature, liquid level set up the chain, simultaneously with midway water injection side by side enter, prevented the jam of defoaming agent pipeline effectively, more effectively reduced the foam that produces in the suspension method polyvinyl chloride production process simultaneously, reduced the entrainment condition of polymerization thick liquids foam, reduced condenser shell and tube jam frequency, improve the polymerizer productivity; the polyether modified organic silicon defoaming agent is more effective, has the advantages of both the polyether type defoaming agent and the organic silicon defoaming agent, can well play a defoaming role at high temperature, and is worthy of popularization for product quality and subsequent processing effect although the price is relatively high.
The defoaming production device of the suspension process polyvinyl chloride resin process reaction system is taken as an example for explanation, and the process is as follows:
And 2, reacting the system for 30 minutes, starting a pneumatic valve of a water injection pipe by a DCS automatic control system, controlling the flow rate of water injection to be 1-6t/h by adjusting the opening of an adjusting valve, injecting water into the polymerization kettle until the polymerization reaction is finished to maintain the shrinkage of the reaction system, and stably maintaining the reaction temperature and the pressure within the range of process set values (SG-5 type 56.5 ℃, P < 0.82Mpa, SG-8 type 67.5 ℃ and P < 1.05 Mpa).
And 3, detecting the foam liquid level of the polymerization reaction system in real time by the DCS automatic control system 11 by using the level type liquid level meter 12, wherein the foam liquid level value of the polymerization reaction system detected by the level type liquid level meter 12 is higher than the bottom probe of the level type liquid level meter 12.
And 4, starting a defoaming agent spray pipe pneumatic valve by the DCS automatic control system 11, directly extracting quantitative defoaming agent liquid in a defoaming agent storage tank (0.5-0.8 g of defoaming agent is injected into the polymerization reaction system when the quantitative defoaming agent liquid level exceeds 1% of the liquid level of the bottom probe of the novel level liquid level meter), and spraying the defoaming agent liquid onto the foam of the polymerization reaction system to reduce the foam quantity of the polymerization reaction system.
And 5, in the reaction process of the system, under the shearing and circulating action of a stirring device in the polymerization kettle, the suspension in the kettle generates foam and suspends above the liquid level of the system, a large amount of gas-phase monomers pass through a liquid layer in the reaction process, then enter a reflux condenser through a reflux condenser and are condensed to a liquid state, and then return to the reaction system, and the foam enters the reflux condenser along with the gas-phase monomers carrying slurry in the reflux process, so that the reflux condenser tubes are easily blocked for a long time. This process tends to occur in the middle of the polymerization: 180-220 min, when the reaction temperature and pressure reach the maximum value, the reaction temperature and pressure are stably maintained at the process set values of (SG-5 type 56.5 ℃, P < 0.82Mpa, SG-8 type 67.5 ℃, and P < 1.05 Mpa).
The embodiment of the utility model provides a production device who realizes as follows description:
3 ends of defoaming agent shower and 7 intercommunications in defoaming agent storage tank, the defoaming agent storage tank is equipped with unloading pump 5, defoaming agent shower top is connected with water injection pipe 8, the top of water injection pipe inserts in the polymerizer 1, 3 top and 8 top intercommunications in water injection pipe of defoaming agent shower, 8 tops of water injection pipe add and are equipped with 360 rotatory nozzle 2.
Further, the embodiment of the utility model provides a device still includes level formula level gauge 12, level formula level gauge 12 installs on 1 top of polymeric kettle additional, 12 bottom probes of level formula level gauge insert in polymeric kettle 1, it sets up the position and sets up according to production reaction pressure, reaction temperature, equipment design condition.
The embodiment of the utility model provides a device carries on DCS automatic control system 11.
The embodiment of the utility model provides a device reduces polymerization system foam volume through directly extracting on defoaming agent liquid sprays polymerization system foam in the defoaming agent storage tank 7, device theory of operation as follows:
the DCS automatic control system 11 utilizes the level meter 12 to detect the foam liquid level of the polymerization reaction system at any time;
the level type liquid level meter 12 detects that the foam liquid level value of the polymerization reaction system is higher than a probe at the bottom of the level type liquid level meter 12;
the DCS automatic control system 11 directly extracts the defoaming agent liquid in the defoaming agent storage tank to spray the defoaming agent liquid on the foam of the polymerization reaction system, so that the foam amount of the polymerization reaction system is reduced.
Finally, it should be noted that: in the description of the present invention, it should be noted that the terms "top", "upper", "lower", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation,
Constructed and operative in a particular orientation and therefore should not be construed as limiting the invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A defoaming production device of a suspension-method polyvinyl chloride resin process reaction system is characterized by comprising a polymerization kettle, a 360-degree rotary spray head, a defoaming agent spray pipe pneumatic valve, a defoaming agent storage tank blanking pump, a defoaming agent storage tank blanking valve, a defoaming agent storage tank, a water injection pipe, a water injection regulating valve, a water injection cut-off valve, a DCS automatic control system and a material level type liquid level meter; a 360-degree rotary spray head and a material level type liquid level meter are arranged in the polymerization kettle; a defoaming agent spray pipe is arranged at the bottleneck of the polymerization kettle; an outlet of the defoaming agent storage tank is provided with a defoaming agent storage tank blanking pump and a defoaming agent storage tank blanking valve; the DCS automatic control system is connected with the level type liquid level meter, the defoaming agent spray pipe pneumatic valve, the defoaming agent storage tank blanking pump, the defoaming agent storage tank blanking valve and the defoaming agent storage tank in real time.
2. The defoaming production device for a suspension process polyvinyl chloride resin process reaction system as claimed in claim 1, wherein said level gauge is attached to the top of the polymerizer, and a probe at the bottom of said level gauge is inserted into said polymerizer, and the position of said probe is set according to the production reaction pressure, the reaction temperature and the equipment design conditions.
3. The defoaming production apparatus for a suspension process polyvinyl chloride resin process reaction system as claimed in claim 1, wherein said defoaming agent spray pipe is disposed at the outlet of the defoaming agent storage tank, and has a defoaming agent spray pipe pneumatic valve thereon.
4. The defoaming production device for a reaction system of a suspension process polyvinyl chloride resin process as claimed in claim 1, wherein the water injection pipe is provided with a water injection regulating valve and a water injection cut-off valve, the initial end of the water injection pipe is connected into the polymerization kettle, and the end of the water injection pipe is provided with a 360-degree rotary nozzle.
5. The defoaming production apparatus for a suspension process polyvinyl chloride resin process reaction system as claimed in claim 1, wherein the starting end of the defoaming agent spray pipe is communicated with the starting end of the water injection pipe, and is branched in parallel with the water injection pipe, and the starting end of the defoaming agent spray pipe is provided with a 360-degree rotating nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220350443.3U CN217188035U (en) | 2022-02-22 | 2022-02-22 | Defoaming production device for suspension-method polyvinyl chloride resin process reaction system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220350443.3U CN217188035U (en) | 2022-02-22 | 2022-02-22 | Defoaming production device for suspension-method polyvinyl chloride resin process reaction system |
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| CN217188035U true CN217188035U (en) | 2022-08-16 |
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| CN202220350443.3U Active CN217188035U (en) | 2022-02-22 | 2022-02-22 | Defoaming production device for suspension-method polyvinyl chloride resin process reaction system |
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