CN111035952A - Energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin - Google Patents
Energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin Download PDFInfo
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- CN111035952A CN111035952A CN201911317653.1A CN201911317653A CN111035952A CN 111035952 A CN111035952 A CN 111035952A CN 201911317653 A CN201911317653 A CN 201911317653A CN 111035952 A CN111035952 A CN 111035952A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
- B01D3/065—Multiple-effect flash distillation (more than two traps)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
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- 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
- C08F6/00—Post-polymerisation treatments
- C08F6/06—Treatment of polymer solutions
- C08F6/10—Removal of volatile materials, e.g. solvents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention relates to an energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin. Specifically, first, the material is transferred from the reaction vessel to the first-stage devolatilizer through a gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, then transferred to the second-stage devolatilizer through the gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, and discharged through the gear pump. The method avoids the use of high-power stirring, reduces energy consumption, and can achieve the advantages of increased evaporation specific surface area, timely interface update, rapid VOCs removal and the like by using a continuous flash evaporation technology and matching with a high-efficiency heat exchange device through a kettle-type devolatilization process.
Description
Technical Field
The invention relates to the field of polymerized styrene-acrylic copolymer resin, in particular to an energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin.
Background
The prior solution method polymerizes styrene-acrylic copolymer resin, removes solvent after the reaction is finished, and uses high temperature and high vacuum degree for devolatilization in the later process so as to meet the requirement of low organic volatile components. The traditional devolatilization process mainly adopts a reaction kettle of a high-power stirrer and a vacuum unit with high vacuum degree, a large amount of solvent is removed through atmospheric distillation in advance, and a small amount of residual solvent and volatile components are removed through high temperature and high vacuum degree in the latter half. The process has several disadvantages: because a high-power stirrer, a high-temperature and powerful vacuum pump unit are adopted, the power consumption and the energy consumption in the whole process are high; in order to control foaming and prevent liquid level from rising sharply, the reaction kettle type devolatilization needs to be carefully controlled at the initial stage of vacuum devolatilization, which is labor-consuming; in the reaction kettle type devolatilization process, the feeding coefficient is very low and generally can not exceed 60 percent of the volume of the reaction kettle, so the efficiency is very low; in the reaction kettle type devolatilization process, the resin liquid always has a relatively deep thickness, and trace VOCs cannot be completely removed even under the conditions of ultra-long time, high temperature and high vacuum degree. In the actual production, about 0.2 to 0.4 percent of residual resin in the product can not be removed; under the condition of long-time high temperature and high vacuum degree, the potential hazards of thermal degradation, shearing degradation and the like exist in the styrene-acrylic copolymer resin after polymerization, so that the performance of the resin is reduced and the like. Therefore, an energy-saving and efficient method for devolatilizing styrene-acrylic copolymer resin with increased evaporation specific surface area, timely interface update and rapid VOCs removal is needed.
Disclosure of Invention
The invention aims to provide an energy-saving and high-efficiency devolatilization method of styrene-acrylic copolymer resin, which has the advantages of increased specific evaporation surface area, timely interface update and rapid VOCs removal.
In order to realize the technical purpose, the invention relates to an energy-saving and high-efficiency devolatilization method of styrene-acrylic copolymer resin, which comprises the following steps:
s1, conveying the materials from the reaction kettle to a first-stage devolatilizer through a gear pump for devolatilization;
s2, after the devolatilization in the step S1 is finished, the mixture is conveyed to a second-stage devolatilizer through a gear pump for devolatilization;
and S3, discharging through a gear pump after the devolatilization in the step S2 is finished, and finishing the work.
The devolatilization process has the beneficial effects that the two-stage devolatilization device is used, the materials are continuously conveyed and are devolatilized to the lowest VOCs value through flash evaporation. Specifically, first, the material is transferred from the reaction vessel to the first-stage devolatilizer through a gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, then transferred to the second-stage devolatilizer through the gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, and discharged through the gear pump. The method avoids the use of high-power stirring, reduces energy consumption, and can achieve the advantages of increased evaporation specific surface area, timely interface update, rapid VOCs removal and the like by using a continuous flash evaporation technology and matching with a high-efficiency heat exchange device through a kettle-type devolatilization process.
Further, the step S1 further includes the following steps:
a1, discharging the material from the reaction kettle and entering a circulation pipeline;
a2, when circulating in the circulating pipeline, external nitrogen and heat conducting oil enter the circulating pipeline to be mixed with the materials;
a3, setting the pressure in the first-stage devolatilization device to be not more than-0.09 MPa relative to the vacuum pressure, and feeding the materials into the first-stage devolatilization device from a flow pipeline for devolatilization treatment.
The step A2 further comprises the following steps:
b1, introducing external nitrogen and heat conducting oil into a circulation pipeline, and then introducing the circulation pipeline into a high-efficiency heat exchanger on the first-stage devolatilization device for heating, wherein the temperature can be increased from 160 ℃ to about 200 ℃;
b2, discharging part of waste heat conducting oil from the heating process, and simultaneously increasing the entering of the heat conducting oil from the outside.
Further, the A3 further comprises the following steps:
c1, when the first-stage devolatilization device carries out devolatilization treatment, the waste gas treatment liquid in the first devolatilization device is discharged into a first condenser through a circulation pipeline;
c2, after the first condenser receives the waste gas treatment liquid, cooling water is introduced into the outside to enter the first condenser for condensation;
c3: after the condensation in the first condenser is finished, the cooling water is discharged, and the waste solvent is discharged into the solvent recovery tank through the circulating pipeline and then is discharged into an external recovery tank through the solvent recovery tank.
Further, the step S2 further includes the following steps:
d1, discharging waste heat oil through a circulation pipeline at the upper end and the lower end of the second-stage devolatilization device simultaneously during the devolatilization process of the second-stage devolatilization device, and simultaneously feeding new heat oil into the second-stage devolatilization device for supplement;
d2, discharging the waste gas treatment liquid at the upper end of the second-stage devolatilization device into a second condenser through a circulation pipeline, and introducing cooling water into the outside to enter the second condenser for condensation after the second condenser receives the waste gas treatment liquid;
d3, after the condensation in the second condenser is finished, discharging cooling water, discharging the waste solvent into a solvent recovery tank through a circulation pipeline, and then discharging the waste solvent into an external recovery tank through the solvent recovery tank.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of an energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin according to the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following specific examples:
the invention aims to provide an energy-saving and high-efficiency devolatilization method of styrene-acrylic copolymer resin, which has the advantages of increased specific evaporation surface area, timely interface update and rapid VOCs removal.
As shown in figure 1, in order to realize the technical purpose, the invention relates to an energy-saving and high-efficiency devolatilization method of styrene-acrylic copolymer resin, which comprises the following steps:
s1, conveying the materials from the reaction kettle to a first-stage devolatilizer through a gear pump for devolatilization;
s2, after the devolatilization in the step S1 is finished, the mixture is conveyed to a second-stage devolatilizer through a gear pump for devolatilization;
and S3, discharging through a gear pump after the devolatilization in the step S2 is finished, and finishing the work.
The devolatilization process has the beneficial effects that the two-stage devolatilization device is used, the materials are continuously conveyed and are devolatilized to the lowest VOCs value through flash evaporation. Specifically, first, the material is transferred from the reaction vessel to the first-stage devolatilizer through a gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, then transferred to the second-stage devolatilizer through the gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, and discharged through the gear pump. The method avoids the use of high-power stirring, reduces energy consumption, and can achieve the advantages of increased evaporation specific surface area, timely interface update, rapid VOCs removal and the like by using a continuous flash evaporation technology and matching with a high-efficiency heat exchange device through a kettle-type devolatilization process.
Further, the step S1 further includes the following steps:
a1, discharging the material from the reaction kettle and entering a circulation pipeline;
a2, when circulating in the circulating pipeline, external nitrogen and heat conducting oil enter the circulating pipeline to be mixed with the materials;
a3, setting the pressure in the first-stage devolatilization device to be not more than-0.09 MPa relative to the vacuum pressure, and feeding the materials into the first-stage devolatilization device from a flow pipeline for devolatilization treatment.
The step A2 further comprises the following steps:
b1, introducing external nitrogen and heat conducting oil into a circulation pipeline, and then introducing the circulation pipeline into a high-efficiency heat exchanger on the first-stage devolatilization device for heating, wherein the temperature can be increased from 160 ℃ to about 200 ℃;
b2, discharging part of waste heat conducting oil from the heating process, and simultaneously increasing the entering of the heat conducting oil from the outside.
Further, the A3 further comprises the following steps:
c1, when the first-stage devolatilization device carries out devolatilization treatment, the waste gas treatment liquid in the first devolatilization device is discharged into a first condenser through a circulation pipeline;
c2, after the first condenser receives the waste gas treatment liquid, cooling water is introduced into the outside to enter the first condenser for condensation;
c3: after the condensation in the first condenser is finished, the cooling water is discharged, and the waste solvent is discharged into the solvent recovery tank through the circulating pipeline and then is discharged into an external recovery tank through the solvent recovery tank.
Further, the step S2 further includes the following steps:
d1, discharging waste heat oil through a circulation pipeline at the upper end and the lower end of the second-stage devolatilization device simultaneously during the devolatilization process of the second-stage devolatilization device, and simultaneously feeding new heat oil into the second-stage devolatilization device for supplement;
d2, discharging the waste gas treatment liquid at the upper end of the second-stage devolatilization device into a second condenser through a circulation pipeline, and introducing cooling water into the outside to enter the second condenser for condensation after the second condenser receives the waste gas treatment liquid;
d3, after the condensation in the second condenser is finished, discharging cooling water, discharging the waste solvent into a solvent recovery tank through a circulation pipeline, and then discharging the waste solvent into an external recovery tank through the solvent recovery tank.
In actual operation, the equipment required by the process comprises a first-stage devolatilizer, a first-stage condenser, a gear pump and a first solvent collecting tank; a second-stage devolatilizer, a second-stage condenser, a gear pump and a second solvent collecting tank; the following were used: a first-stage devolatilizer: the heating medium is heat conducting oil (the using temperature is 250 ℃), the upper part of the heating medium is provided with a high-efficiency heat exchanger, materials are pumped in through a gear pump and pass through the high-efficiency heat exchanger within a few seconds, and the temperature can be raised from 160 ℃ to about 200 ℃, so that the optimal devolatilization effect is achieved. The lower part is a falling strip devolatilizer, the appearance is high cylindrical, the ratio of the diameter to the height of the equipment is large, the material falls for several seconds through a high-efficiency heat exchanger under high vacuum degree, and the solvent content of the material can be removed to be within 0.3 percent (thousands of ppm) from about 10 percent. Falls to the bottom of the first-stage devolatilizer and is immediately conveyed into the second-stage devolatilizer by a gear pump. A second-stage devolatilizer: the material is also a falling strip devolatilization device, the appearance is a high cylinder shape, the diameter and the height are larger, and the material passes through a second-stage devolatilization device under high vacuum degree. The VOCs of the final product is controlled below 300 ppm.
In actual operation, the material is continuously conveyed and is devolatilized to the lowest VOCs value through flash evaporation. Specifically, first, the material is transferred from the reaction vessel to the first-stage devolatilizer through a gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, then transferred to the second-stage devolatilizer through the gear pump, devolatilized at a relative vacuum pressure of not more than-0.09 MPa, and discharged through the gear pump. Through the continuous operation mode of the falling strip type devolatilization device, the energy-saving and efficiency-increasing effects are obvious, the comprehensive automatic operation can be performed, and the safety, the reliability and the environmental protection are realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. An energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin is characterized by comprising the following steps:
s1, conveying the materials from the reaction kettle to a first-stage devolatilizer through a gear pump for devolatilization;
s2, after the devolatilization in the step S1 is finished, the mixture is conveyed to a second-stage devolatilizer through a gear pump for devolatilization;
and S3, discharging through a gear pump after the devolatilization in the step S2 is finished, and finishing the work.
2. The energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin as recited in claim 1, wherein said step S1 further comprises the steps of:
a1, discharging the material from the reaction kettle and entering a circulation pipeline;
a2, when circulating in the circulating pipeline, external nitrogen and heat conducting oil enter the circulating pipeline to be mixed with the materials;
a3, setting the pressure in the first-stage devolatilization device to be not more than-0.09 MPa relative to the vacuum pressure, and feeding the materials into the first-stage devolatilization device from a flow pipeline for devolatilization treatment.
3. The energy-saving and high-efficiency devolatilization method of styrene-acrylic copolymer resin as recited in claim 2, wherein said step a2 further comprises the steps of:
b1, introducing external nitrogen and heat conducting oil into a circulation pipeline, and then introducing the circulation pipeline into a high-efficiency heat exchanger on the first-stage devolatilization device for heating, wherein the temperature can be increased from 160 ℃ to about 200 ℃;
b2, discharging part of waste heat conducting oil from the heating process, and simultaneously increasing the entering of the heat conducting oil from the outside.
4. The energy-saving and high-efficiency devolatilization method of styrene-acrylic copolymer resin as recited in claim 2, wherein said a3 further comprises the following steps:
c1, when the first-stage devolatilization device carries out devolatilization treatment, the waste gas treatment liquid in the first devolatilization device is discharged into a first condenser through a circulation pipeline;
c2, after the first condenser receives the waste gas treatment liquid, cooling water is introduced into the outside to enter the first condenser for condensation;
c3: after the condensation in the first condenser is finished, the cooling water is discharged, and the waste solvent is discharged into the solvent recovery tank through the circulating pipeline and then is discharged into an external recovery tank through the solvent recovery tank.
5. The energy-saving and efficient devolatilization method of styrene-acrylic copolymer resin as recited in claim 1, wherein said step S2 further comprises the steps of:
d1, discharging waste heat oil through a circulation pipeline at the upper end and the lower end of the second-stage devolatilization device simultaneously during the devolatilization process of the second-stage devolatilization device, and simultaneously feeding new heat oil into the second-stage devolatilization device for supplement;
d2, discharging the waste gas treatment liquid at the upper end of the second-stage devolatilization device into a second condenser through a circulation pipeline, and introducing cooling water into the outside to enter the second condenser for condensation after the second condenser receives the waste gas treatment liquid;
d3, after the condensation in the second condenser is finished, discharging cooling water, discharging the waste solvent into a solvent recovery tank through a circulation pipeline, and then discharging the waste solvent into an external recovery tank through the solvent recovery tank.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112275219A (en) * | 2020-11-13 | 2021-01-29 | 江苏诚盟装备股份有限公司 | Complete equipment for high-efficiency devolatilization of polymer high-content solvent |
| CN112275219B (en) * | 2020-11-13 | 2024-05-14 | 江苏诚盟装备股份有限公司 | High-efficient devolatilization complete equipment of high-content solvent of polymer |
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| WO1999050314A1 (en) * | 1998-03-27 | 1999-10-07 | Nippon Steel Chemical Co., Ltd. | Method for removing volatile matter from polymer solution composition |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112275219A (en) * | 2020-11-13 | 2021-01-29 | 江苏诚盟装备股份有限公司 | Complete equipment for high-efficiency devolatilization of polymer high-content solvent |
| CN112275219B (en) * | 2020-11-13 | 2024-05-14 | 江苏诚盟装备股份有限公司 | High-efficient devolatilization complete equipment of high-content solvent of polymer |
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