CN104558268B - Defoaming method for discharging process in polymerization reaction - Google Patents
Defoaming method for discharging process in polymerization reaction Download PDFInfo
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- CN104558268B CN104558268B CN201410842956.6A CN201410842956A CN104558268B CN 104558268 B CN104558268 B CN 104558268B CN 201410842956 A CN201410842956 A CN 201410842956A CN 104558268 B CN104558268 B CN 104558268B
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Abstract
The invention provides a defoaming method for a discharging process in a polymerization reaction. The method comprises steps as follows: (1) reacted materials in a reactor enter a gas-liquid separation device via a discharging pump, and a defoaming agent is added to an outlet of the discharging pump; (2) the materials are rotated after entering the gas-liquid separation device, one part of unreacted monomers mixed with the materials are separated from main materials under the action of the centrifugal force, are separated from the gas-liquid separation device in advance and do not enter a discharging tank, and the other part of unreacted monomers enter the discharging tank along with the main materials through a pipeline; (3) slurry in the discharging tank further releases monomer gas under the action of a stirrer, the gas is exhausted through an outlet of a gas-phase pipeline to enter downstream procedures, and the main materials are discharged through a material outlet to enter the downstream procedures. The method has the main advantages as follows: foam during discharging is avoided, the production capacity is improved, and the productivity is about 20% higher than that of an existing technology.
Description
Technical field
The present invention relates to polymerization process, the debubbling method of discharging process in more particularly, to a kind of polyreaction.
Background technology
In multiple polyreactions, due to adding dispersant, emulsifying agent so that reacting the material finishing in discharging process
Middle bubble problem is than more serious.After polyreaction terminates, starting monomer will not be completely converted into product, and unreacted monomer is dissolved in
In slurry, follow slurry and squeezed in blow tank by discharging pump together.During slurry injection blow tank, it is dissolved in therein
Monomer can be changed into gas due to the reduction of pressure and parse, and entrainment of short grained slurry, forms serious foam.For
Avoid foam to produce impact to follow-up system, after the foam in blow tank is cleared up naturally, typically all carry out next step again
Operation.Different according to the type of polyreaction, foam time in defoaming process, went out for generally 0.5 hour by 2 hours
The reactor of hopper upstream can not reduce to this equipment discharging, for waiting state, so this operation extends the cycle of reaction
Device productivity ratio；Carry material additionally, due in foam secretly, so producing of foam can produce impact to follow-up technological operation,
Operation to equipment works the mischief, and product quality is impacted, and therefore de-foaming process is especially big for polymerization production device
It is significant for the polymerization production device of scale.
At present in polymerization discharging, it is generally adopted by for the material in reactor being sent directly into postorder by discharging pump
In blow tank.This blow tank top is provided with the gas phase pipeline for reclaiming unreacted material, the compressor of this gas phase pipeline and postorder
System is connected；Bottom is used for storing slurry (product), enters the vapour of postorder after this slurry complete unreacted monomer to be recycled
Carry, be dried, sieving operation, being stored in for sale in feed bin after screening is qualified.During slurry injection blow tank, it is dissolved in wherein
Monomer can be parsed due to the reduction of pressure, and entrainment of short grained slurry, foam can be produced in blow tank, should
Foam outwards can discharge with the top gas phase pipeline of blow tank, and foam can be attached to the upper container wall of blow tank, top
In pipeline, when bubbling serious, foam also can enter the compressor assembly of postorder.It is entrained with material due in foam, so once
Enter compressor assembly, the production run of compressor can be endangered；In addition stick to container, the foam in pipeline can in chamber wall,
Gather on tube wall, form block bur, with the continuous growth of this bur volume, eventually mix the material of bottom in groove
Interior and enter follow-up system, because the more conventional product of the volume of this bur is big, therefore to follow-up stripping, it is dried, screening is all
Produce impact, finally affect product quality, make the particle size distribution of product unqualified, colourity is deteriorated, processing characteristics reduces.
In order to avoid the impact of foam, present elongated operation is addition defoamer in groove, then from blow tank
Portion feeds, and using the space of equipment vertical direction, makes drop and solid particle free settling, treats that foam is cleared up naturally, this behaviour does
Time is longer, and in general suspension type polyvinyl-chloride produces, foam time in blow tank for the foam is about 0.5 hour left side
Right；In the production of paste resin, foam time in blow tank for the foam is about 1 hour about, and this operating time accounts for entirely
The time of the 1/5 of reaction time, therefore greatly reduce productivity ratio.In addition this technique cannot avoid the generation of foam, is setting
Standby upper inside wall, inner-walls of duct still can form bur it is impossible to fundamentally improve the defoaming effect of material.
Content of the invention
The purpose of the present invention is the technological deficiency for prior art, employs the following technical solutions：
In a kind of polyreaction, the debubbling method of discharging process, comprises the steps：
(1) material completing in reactor to react enters gas-liquid separation device through discharging pump, and discharging pump exit adds
Defoamer；
(2), after material enters gas-liquid separation device, inside produce rotation, be mixed in a part of unreacted monomer in material
Under the action of the centrifugal force with main feed separation, it is previously isolated from away from gas-liquid separation device, do not enter blow tank, another part
Unreacted monomer enters blow tank with principal goods material by insertion tube；It is provided with baffle plate in blow tank；Blow tank arranges gas phase pipeline
Outlet and material outlet, and the two is arranged on the offside of blow tank；Described gas phase pipe outlet sets foam separator；
(3) in blow tank, slurry, under agitator effect, discharges monomer gas, gas is gone out by gas phase pipeline further
Mouth is discharged, and enters lower procedure；Principal goods material is discharged into lower procedure by material outlet.
Further, the described gas-liquid separation device of step (1) is cyclone separator or cyclone hydraulic separators.
Further, the material completing to react in step (1) reactor enters gas-liquid through discharging pump by tangential way and divides
From device.
Further, the unreacted monomer in step (2) enters blow tank with principal goods material by pipeline, and described pipeline is
Insertion form of tubes.
Further, set agitator device in described blow tank, described foam separator carries multiple quick rotating vanes.
The debubbling method of the present invention is applied to suspension type polyvinyl-chloride, emulsion method paste resin or emulsion method poly- 1,3- butadiene
In the operation of polyreaction discharging froth breaking.
Material first tangent line after discharging pump enters gas-liquid separation device, sets defoamer in discharging pump discharge.Slurry enters
After in gas-liquid separation device, inside produce rotation, the unreacted monomer being mixed in material also follow-rise rotate and produce from
Mental and physical efforts, because its quality is less, under the action of the centrifugal force with main feed separation, a part of unreacted monomer raw material is from gas-liquid separation
It is previously isolated from away in device, does not enter blow tank, fundamentally reduce the amount that foam produces；In addition add defoamer in advance,
It can be made to produce defoaming effect in advance.
Material after gas-liquid separation is entered in blow tank by pipeline by gravity stream, and entering pipeline is insertion
Form of tubes, this form is avoided that the rapid release of the unreacted monomer being dissolved in material, thus slowing down foam to produce speed.
Blow tank bosom increases baffle plate, gas phase pipe outlet and material inlet in the offside of equipment, when carrying little secretly
Grain monomer gas discharge blow tank when, due to the presence of baffle plate, ramping of gas can be hindered, make gas with baffle plate
In collision process, isolate little particle, reduce the amount carrying material particles in gas secretly.
Set foam separator in the gas phase pipe outlet of blow tank, foam separator carries multiple quick rotating vanes, profit
With the principle of centrifugal force, the foam being carried secretly out by gas from blow tank is smashed, gas is along the ease radially upward of blade
Go out, liquid and solid are along the stream radially downward of blade, thus ensureing gas not entrained solid particles during release.
It is provided with agitating device in blow tank, under agitating device continuously runs effect, can be by the gas in blow tank slurry
Foam is smashed, and is conducive to the release of gas, and make slurry density more uniform, improve product quality.
The generation of foam in blow tank can be avoided using this de-foaming process, the work shape waiting no longer in upstream equipment
Condition, improves productivity ratio.
Main advantages of the present invention have：
Avoid the production of foam during discharging, improve production capacity, productivity ratio about 20% can be improved compared with current technology.
Reduce the amount of unreacted monomer entrained solid particles, reduce the danger that in reclaimer operation, recovered material produces to compressor
Evil, improves equipment reliability of operation.
Reduce the probability that unqualified powder in material, improve material in follow-up stripping, drying, screening process
Adaptability, improves the indexs such as the particle size distribution of product, apparent colourity, improves the quality of product.
Brief description
Fig. 1 is the process chart of the present invention
Fig. 2 is the structural representation of blow tank of the present invention
The each sequence number of in figure is respectively
1st, material inlet 2, material outlet 3, foam separator
4th, baffle plate 5, agitator 6, gas phase pipe outlet
Specific embodiment
Embodiment 1
Suspension type polyvinyl-chloride (S-PVC) polyreaction discharging comprises the steps：
(1) material completing in reactor to react enters gas-liquid separation device through discharging pump, and gas-liquid separation device selects
Cyclone separator, discharging pump exit adds defoamer；The material completing in reactor to react passes through tangent line side through discharging pump
Formula enters gas-liquid separation device.
(2), after material enters gas-liquid separation device, inside produce rotation, be mixed in a part of unreacted monomer in material
Under the action of the centrifugal force with main feed separation, it is previously isolated from away from gas-liquid separation device, do not enter blow tank, another part
Unreacted monomer enters blow tank with principal goods material by pipeline；Unreacted monomer enters discharging with principal goods material by pipeline
Groove, described pipeline is insertion slot form.
(3) gas in blow tank is discharged by gas phase pipe outlet, enters lower procedure；Principal goods material passes through material outlet
It is discharged into lower procedure, described blow tank bosom is provided with baffle plate；Blow tank setting gas phase pipe outlet and material go out
Mouthful, and the two is arranged on the offside of blow tank；Described gas phase pipe outlet sets foam separator；Blow tank is provided with multiple quick rotations
Rotating vane piece.
Embodiment 2
Emulsion method paste resin (E-PVC) polyreaction discharging comprises the steps：
(1) material completing in reactor to react enters gas-liquid separation device through discharging pump, and gas-liquid separation device selects
Cyclone hydraulic separators, discharging pump exit adds defoamer；The material completing in device to react is answered to pass through tangential way through discharging pump
Enter gas-liquid separation device.
(2), after material enters gas-liquid separation device, inside produce rotation, be mixed in a part of unreacted monomer in material
Under the action of the centrifugal force with main feed separation, it is previously isolated from away from gas-liquid separation device, do not enter blow tank, another part
Unreacted monomer enters blow tank with principal goods material by pipeline；Unreacted monomer enters discharging with principal goods material by pipeline
Groove, described pipeline is insertion slot form.
(3) gas in blow tank is discharged by gas phase pipe outlet, enters lower procedure；Principal goods material passes through material outlet
It is discharged into lower procedure, described blow tank bosom is provided with baffle plate；Blow tank setting gas phase pipe outlet and material go out
Mouthful, and the two is arranged on the offside of blow tank；Described gas phase pipe outlet sets foam separator；Blow tank is provided with multiple quick rotations
Rotating vane piece.
Embodiment 3
Emulsion method poly- 1,3- butadiene (PB) polyreaction discharging comprises the steps：
(1) material completing in reactor to react enters gas-liquid separation device through discharging pump, and gas-liquid separation device selects
Cyclone hydraulic separators, discharging pump exit adds defoamer；
(2), after material enters gas-liquid separation device, inside produce rotation, be mixed in a part of unreacted monomer in material
Under the action of the centrifugal force with main feed separation, it is previously isolated from away from gas-liquid separation device, do not enter blow tank, another part
Unreacted monomer enters blow tank with principal goods material by insertion tube；It is provided with baffle plate in blow tank；Blow tank arranges gas phase pipeline
Outlet and material outlet, and the two is arranged on the offside of blow tank；Described gas phase pipe outlet sets foam separator；
(3) in blow tank, slurry, under agitator effect, discharges monomer gas, gas is gone out by gas phase pipeline further
Mouth is discharged, and enters lower procedure；Principal goods material is discharged into lower procedure by material outlet.
Above embodiments of the invention are described in detail, but described content have been only presently preferred embodiments of the present invention,
Not in order to limit the present invention.All any modification, equivalent and improvement made in the application range of the present invention etc., all should
It is included within protection scope of the present invention.
Claims (6)
1. in a kind of polyreaction the debubbling method of discharging process it is characterised in that comprising the steps：
(1) material completing in reactor to react enters gas-liquid separation device through discharging pump, and discharging pump exit adds froth breaking
Agent；
(2), after material enters gas-liquid separation device, inside produce rotation, be mixed in a part of unreacted monomer in material from
With main feed separation under mental power function, it is previously isolated from away from gas-liquid separation device, does not enter blow tank, another part is not anti-
The monomer answered enters blow tank with principal goods material by insertion tube；It is provided with baffle plate in blow tank；Blow tank arranges gas phase pipe outlet
And material outlet, and the two is arranged on the offside of blow tank；Described gas phase pipe outlet sets foam separator；
(3) in blow tank, slurry, under agitator effect, discharges monomer gas, gas is arranged by gas phase pipe outlet further
Go out, enter lower procedure；Principal goods material is discharged into lower procedure by material outlet.
2. in a kind of polyreaction according to claim 1 the debubbling method of discharging process it is characterised in that step (1)
Described gas-liquid separation device is cyclone separator or cyclone hydraulic separators.
3. in a kind of polyreaction according to claim 1 the debubbling method of discharging process it is characterised in that step (1)
The material completing in reactor to react enters gas-liquid separation device through discharging pump by tangential way.
4. in a kind of polyreaction according to claim 1 the debubbling method of discharging process it is characterised in that step (2)
In unreacted monomer with principal goods material, blow tank is entered by pipeline, described pipeline is insertion form of tubes.
5. according to discharging process in a kind of polyreaction described in claim 1 debubbling method it is characterised in that described discharging
Agitator device is set, described foam separator carries multiple quick rotating vanes in groove.
6. in a kind of polyreaction described in claim 1-3 any claim discharging process debubbling method, its feature exists
In, be applied to suspension type polyvinyl-chloride, emulsion method paste resin or emulsion method poly- 1,3-butadiene polyreaction discharging froth breaking operation
In.
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| CN201410842956.6A CN104558268B (en) | 2014-12-30 | 2014-12-30 | Defoaming method for discharging process in polymerization reaction |
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| CN201410842956.6A CN104558268B (en) | 2014-12-30 | 2014-12-30 | Defoaming method for discharging process in polymerization reaction |
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| CN104558268B true CN104558268B (en) | 2017-02-22 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514209A (en) * | 2012-01-10 | 2012-06-27 | 保定华翼风电叶片研究开发有限公司 | Defoaming method and defoaming device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5849710A (en) * | 1981-09-18 | 1983-03-24 | Shin Etsu Chem Co Ltd | Defoaming method in preparation of vinyl chloride polymer and polymerizing apparatus |
| JP5679116B2 (en) * | 2011-03-08 | 2015-03-04 | 東洋製罐株式会社 | Defoaming device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514209A (en) * | 2012-01-10 | 2012-06-27 | 保定华翼风电叶片研究开发有限公司 | Defoaming method and defoaming device |
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