CN107398089B - Styrene-acrylic emulsion demonomerization device and process based on static mixer and ultrasonic defoaming - Google Patents
Styrene-acrylic emulsion demonomerization device and process based on static mixer and ultrasonic defoaming Download PDFInfo
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- CN107398089B CN107398089B CN201610827710.0A CN201610827710A CN107398089B CN 107398089 B CN107398089 B CN 107398089B CN 201610827710 A CN201610827710 A CN 201610827710A CN 107398089 B CN107398089 B CN 107398089B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/105—Mixing heads, i.e. compact mixing units or modules, using mixing valves for feeding and mixing at least two components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0073—Degasification of liquids by a method not covered by groups B01D19/0005 - B01D19/0042
- B01D19/0078—Degasification of liquids by a method not covered by groups B01D19/0005 - B01D19/0042 by vibration
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
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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
- C08F6/14—Treatment of polymer emulsions
- C08F6/16—Purification
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- Organic Chemistry (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
According to the styrene-acrylic emulsion demonomerization device and the styrene-acrylic emulsion demonomerization process based on the static mixer and the ultrasonic defoaming, the styrene-acrylic emulsion and the water vapor are mixed and enter the static mixer to be subjected to the enhanced stripping operation, then enter the flash tank with the ultrasonic generator to be subjected to the steam stripping, and the steam-liquid separation in the flash tank is accelerated by utilizing the bubble breaking effect of ultrasonic waves, so that the volume of the flash tank is reduced, and the process enhancement effect is achieved. The static mixer and the demister are made of polytetrafluoroethylene materials with lower surface adhesion capacity, so that the adhesion of polymers can be effectively prevented, and the stable operation of the process and the overhaul of the device are facilitated. The invention has the advantages of high styrene-acrylic emulsion demonomerization efficiency and small equipment volume.
Description
Technical Field
The invention relates to a post-treatment process of polymerized emulsion, in particular to a styrene-acrylic emulsion demonomerization device and a styrene-acrylic emulsion demonomerization process based on a static mixer and ultrasonic defoaming.
Background
The styrene-acrylic emulsion (styrene-acrylic ester emulsion) is prepared by copolymerizing styrene and acrylic ester monomers through emulsion, has good water resistance, alkali resistance and scrubbing resistance, is resistant to outdoor aging, and is widely applied to the fields of adhesives, coatings and the like. The monomer cannot be converted 100% in the production of styrene-acrylic emulsion, and some unreacted monomer is inevitably present in the emulsion. The monomer of the styrene-acrylic emulsion is a compound containing unsaturated double bonds, such as styrene, acrylic acid and ester compounds thereof. These compounds have adverse environmental effects, and also have strong irritating odors and varying degrees of toxicity, which can be detrimental to the health of the user, such as causing skin irritation, dyspnea, headaches, and the like. Therefore, it is very important to reduce the residual monomer in the styrene-acrylic emulsion as much as possible. Steam stripping is a common method for removing residual monomers from polymer emulsions, which is to introduce steam or steam containing other inert gases into the polymer emulsion in a stripping tower under vacuum at a certain temperature and to carry away the residual monomers from the polymer emulsion by using the interface generated by the contact of these gases with the liquid phase (shengxin, xidelen, zhuan. The research progress of the method for removing residual monomers from polymer emulsions [ J ] polymer materials science and engineering, 2013 (06): 160-164.). Because the stripping method is carried out under the vacuum condition, a large amount of bubbles can be generated in the polymer emulsion during degassing in the stripping tower and the separating tank, on one hand, the foam can be prevented from entering a vacuum system only by increasing the volume of the stripping tower and the separating tank, and on the other hand, the bubbles can not be broken in time and can not be renewed, so that the stripping effect is reduced. Therefore, it is necessary to develop a polymer emulsion stripping and demonomerization device and a process which can break the foam in time.
Disclosure of Invention
The invention aims to provide a styrene-acrylic emulsion demonomerization device and a styrene-acrylic emulsion demonomerization process based on a static mixer and ultrasonic defoaming.
The technical scheme adopted by the invention for solving the technical problems is as follows: a styrene-acrylic emulsion demonomerization device based on static mixer and ultrasonic defoaming, the device be: the first pipeline is communicated with a first port of the tee joint, the second pipeline is communicated with a second port of the tee joint, one end of the third pipeline is communicated with a third port of the tee joint, the other end of the third pipeline is communicated with an inlet of the static mixer 1, an outlet of the static mixer 1 is communicated with one end of the fourth pipeline, a throttle valve 2 is arranged on the fourth pipeline, and the other end of the fourth pipeline is communicated with the middle part of the flash tank 3; a demister 3-1 is arranged at the upper part of the flash tank 3, an ultrasonic generator 3-2 is arranged at the middle part of the flash tank 3, and the bottom of the flash tank 3 is communicated with a fifth pipeline; one end of a sixth pipeline is communicated with the top of the flash tank 3, and the other end of the sixth pipeline is communicated with an inlet of the condenser 4; an outlet of the condenser 4 is communicated with one end of a seventh pipeline, and the other end of the seventh pipeline is communicated with the middle part of the condensate collecting tank 5; one end of the eighth pipeline is communicated with the top of the condensate collecting tank 5, and the other end of the eighth pipeline is communicated with a vacuum-pumping system.
As a modification, the static mixer 1 is made of polytetrafluoroethylene.
As an improvement, the demister 3-1 is made of polytetrafluoroethylene.
A styrene-acrylic emulsion demonomerization process based on a static mixer and ultrasonic defoaming comprises the following steps: the styrene-acrylic emulsion enters the tee joint through the first pipeline, the steam enters the tee joint through the second pipeline, the styrene-acrylic emulsion and the steam are mixed in the tee joint to obtain a first gas-liquid mixture, the first gas-liquid mixture enters the static mixer 1 through the third pipeline, the first gas-liquid mixture passes through the static mixer 1, enters the fourth pipeline and enters the flash tank 3 through the throttle valve 2, and the first gas-liquid mixture in the flash tank 3 is subjected to gas-liquid separation under the action of ultrasonic waves emitted by the ultrasonic generator 3-2 to obtain a first gas phase and a first liquid phase; the first liquid phase falls into the bottom of the flash tank 3 under the action of gravity to obtain the monopropylene-styrene-removed emulsion, and the monopropylene-styrene-removed emulsion is discharged through a fifth pipeline; the first vapor phase upwards passes through a demister 3-1 arranged at the upper part of the flash tank 3, enters the top of the flash tank 3, enters a condenser 4 through a sixth pipeline, and is partially condensed to form a second vapor-liquid mixture; the second vapor-liquid mixture enters a condensate collecting tank 5 through a seventh pipeline, and the second vapor-liquid mixture is subjected to vapor-liquid separation in the condensate collecting tank 5 to obtain a second liquid phase and a second vapor phase; the second liquid phase falls to the bottom of the condensate collection tank 5; the second vapour phase is drawn from the top of the condensate collection tank 5 via an eighth line to the vacuum system.
As an improvement, the mass ratio of the styrene-acrylic emulsion to water vapor is 5 to 15.
As an improvement, the absolute pressure of one end of the throttling valve 2 close to the static mixer 1 is 60 to 100 kPa.
As an improvement, the absolute pressure in the flash tank 3 is 0.1 to 10kPa.
Further improved, the frequency of the ultrasonic wave emitted by the ultrasonic wave generator 3-2 is 25000 to 60000Hz.
The invention has the following beneficial effects: 1. the separation speed of the gas-liquid mixture in the flash tank is accelerated by using the function of ultrasonic wave bubble breaking, so that the volume of the flash tank is reduced, and the process strengthening effect is achieved; 2. the static mixer can strengthen the mixing effect of the water vapor and the styrene-acrylic emulsion, accelerate the diffusion speed of the monomer in the styrene-acrylic emulsion to the water vapor phase and also has the effect of process strengthening; 3. the static mixer and the demister are made of polytetrafluoroethylene materials with lower surface adhesion capacity, can effectively prevent polymer adhesion caused by misoperation, prevent polymer deposition and block equipment, and are beneficial to stable operation of the process and overhaul of the device.
Drawings
FIG. 1 is a schematic diagram of a styrene-acrylic emulsion demonomerization device based on a static mixer and ultrasonic defoaming in accordance with the present invention.
Wherein: 1 is a static mixer, 2 is a throttle valve, 3 is a flash tank, 4 is a condenser, 5 is a condensate collecting tank, 3-1 is a demister, and 3-2 is an ultrasonic generator.
Detailed Description
The invention is described in further detail below by way of example with reference to fig. 1.
Example 1
The first pipeline is communicated with a first port of the tee joint, the second pipeline is communicated with a second port of the tee joint, one end of the third pipeline is communicated with a third port of the tee joint, the other end of the third pipeline is communicated with an inlet of the static mixer 1, the static mixer 1 is made of polytetrafluoroethylene, an outlet of the static mixer 1 is communicated with one end of a fourth pipeline, a throttle valve 2 is arranged on the fourth pipeline, and the other end of the fourth pipeline is communicated with the middle part of the flash tank 3; a demister 3-1 is arranged at the upper part of the flash tank 3, the demister 3-1 is made of polytetrafluoroethylene, an ultrasonic generator 3-2 is arranged in the middle of the flash tank 3, and the bottom of the flash tank 3 is communicated with a fifth pipeline; one end of a sixth pipeline is communicated with the top of the flash tank 3, and the other end of the sixth pipeline is communicated with an inlet of the condenser 4; an outlet of the condenser 4 is communicated with one end of a seventh pipeline, and the other end of the seventh pipeline is communicated with the middle part of the condensate collecting tank 5; one end of the eighth pipeline is communicated with the top of the condensate collecting tank 5, and the other end of the eighth pipeline is communicated with a vacuum pumping system.
The styrene-acrylic emulsion with the monomer content of 1000 ppm enters the tee joint through the first pipeline, the steam enters the tee joint through the second pipeline, and the mass ratio of the styrene-acrylic emulsion to the steam is 5; mixing styrene-acrylic emulsion and water vapor in a tee joint to obtain a first gas-liquid mixture, feeding the first gas-liquid mixture into a static mixer 1 through a third pipeline, feeding the first gas-liquid mixture into a fourth pipeline after passing through the static mixer 1, feeding the second gas-liquid mixture into a flash tank 3 through a throttling valve 2, wherein the absolute pressure of one end, close to the static mixer 1, of the throttling valve 2 is 60 kPa, and the absolute pressure in the flash tank 3 is 0.1 kPa; the first gas-liquid mixture in the flash tank 3 is subjected to gas-liquid separation under the action of ultrasonic waves emitted by an ultrasonic generator 3-2 to obtain a first gas phase and a first liquid phase, and the frequency of the ultrasonic waves is set at 25000Hz; the first liquid phase falls into the bottom of the flash tank 3 under the action of gravity to obtain demonomerization emulsion with the monomer content of 200 ppm, and the demonomerization emulsion is discharged through a fifth pipeline; the first vapor phase upwards passes through a demister 3-1 arranged at the upper part of the flash tank 3, enters the top of the flash tank 3, enters a condenser 4 through a sixth pipeline, and is partially condensed to form a second vapor-liquid mixture; the second vapor-liquid mixture enters a condensate collecting tank 5 through a seventh pipeline, and the second vapor-liquid mixture is subjected to vapor-liquid separation in the condensate collecting tank 5 to obtain a second liquid phase and a second vapor phase; the second liquid phase falls to the bottom of the condensate collection tank 5; the second vapour phase is led from the top of the condensate collection tank 5 via an eighth line to the vacuum pumping system.
Example 2
The apparatus was the same as in example 1. The styrene-acrylic emulsion with the monomer content of 680 ppm enters the tee joint through the first pipeline, the steam enters the tee joint through the second pipeline, and the mass ratio of the styrene-acrylic emulsion to the steam is 15; mixing styrene-acrylic emulsion and water vapor in a tee joint to obtain a first gas-liquid mixture, feeding the first gas-liquid mixture into a static mixer 1 through a third pipeline, feeding the first gas-liquid mixture into a fourth pipeline after passing through the static mixer 1, feeding the first gas-liquid mixture into a flash tank 3 through a throttle valve 2, wherein the absolute pressure of one end, close to the static mixer 1, of the throttle valve 2 is 100kPa, and the absolute pressure in the flash tank 3 is 10 kPa; the first gas-liquid mixture in the flash tank 3 is subjected to gas-liquid separation under the action of ultrasonic waves emitted by an ultrasonic generator 3-2 to obtain a first gas phase and a first liquid phase, and the frequency of the ultrasonic waves is set at 60000Hz; the first liquid phase falls into the bottom of the flash tank 3 under the action of gravity to obtain a demonomerization emulsion with the monomer content of 150 ppm, and the demonomerization emulsion is discharged through a fifth pipeline; the first vapor phase upwards passes through a demister 3-1 arranged at the upper part of the flash tank 3, enters the top of the flash tank 3, enters a condenser 4 through a sixth pipeline, and is partially condensed to form a second vapor-liquid mixture; the second vapor-liquid mixture enters a condensate collecting tank 5 through a seventh pipeline, and the second vapor-liquid mixture is subjected to vapor-liquid separation in the condensate collecting tank 5 to obtain a second liquid phase and a second vapor phase; the second liquid phase falls to the bottom of the condensate collection tank 5; the second vapour phase is led from the top of the condensate collection tank 5 via an eighth line to the vacuum pumping system.
Example 3
The apparatus was the same as in example 1. The styrene-acrylic emulsion with the monomer content of 820 ppm enters the tee joint through the first pipeline, the steam enters the tee joint through the second pipeline, and the mass ratio of the styrene-acrylic emulsion to the steam is 10; mixing styrene-acrylic emulsion and water vapor in a tee joint to obtain a first gas-liquid mixture, feeding the first gas-liquid mixture into a static mixer 1 through a third pipeline, feeding the first gas-liquid mixture into a fourth pipeline after passing through the static mixer 1, feeding the first gas-liquid mixture into a flash tank 3 through a throttle valve 2, wherein the absolute pressure of one end, close to the static mixer 1, of the throttle valve 2 is 80 kPa, and the absolute pressure in the flash tank 3 is 5 kPa; the first gas-liquid mixture in the flash tank 3 is subjected to gas-liquid separation under the action of ultrasonic waves emitted by an ultrasonic generator 3-2 to obtain a first gas phase and a first liquid phase, and the frequency of the ultrasonic waves is set at 35000Hz; the first liquid phase falls into the bottom of the flash tank 3 under the action of gravity to obtain demonomerization emulsion with the monomer content of 120 ppm, and the demonomerization emulsion is discharged through a fifth pipeline; the first vapor phase upwards passes through a demister 3-1 arranged at the upper part of the flash tank 3, enters the top of the flash tank 3, enters a condenser 4 through a sixth pipeline, and is partially condensed to form a second vapor-liquid mixture; the second vapor-liquid mixture enters a condensate collecting tank 5 through a seventh pipeline, and the second vapor-liquid mixture is subjected to vapor-liquid separation in the condensate collecting tank 5 to obtain a second liquid phase and a second vapor phase; the second liquid phase falls to the bottom of the condensate collection tank 5; the second vapour phase is drawn from the top of the condensate collection tank 5 via an eighth line to the vacuum system.
Claims (2)
1. A styrene-acrylic emulsion demonomerization process based on a static mixer and ultrasonic defoaming is characterized in that:
the styrene-acrylic emulsion demonomerization device based on the static mixer and the ultrasonic defoaming comprises: the first pipeline is communicated with a first port of the tee joint, the second pipeline is communicated with a second port of the tee joint, one end of the third pipeline is communicated with a third port of the tee joint, the other end of the third pipeline is communicated with an inlet of a static mixer, an outlet of the static mixer is communicated with one end of a fourth pipeline, a throttle valve is arranged on the fourth pipeline, and the other end of the fourth pipeline is communicated with the middle part of the flash tank; the upper part of the flash tank is provided with a demister, the middle part of the flash tank is provided with an ultrasonic generator, and the bottom of the flash tank is communicated with a fifth pipeline; one end of the sixth pipeline is communicated with the top of the flash tank, and the other end of the sixth pipeline is communicated with an inlet of the condenser; the outlet of the condenser is communicated with one end of a seventh pipeline, and the other end of the seventh pipeline is communicated with the middle part of the condensate collecting tank; one end of the eighth pipeline is communicated with the top of the condensate collecting tank, and the other end of the eighth pipeline is communicated with a vacuum pumping system;
the static mixer is made of polytetrafluoroethylene;
the demister is made of polytetrafluoroethylene;
the process comprises the following steps:
the styrene-acrylic emulsion enters the tee joint through the first pipeline, the water vapor enters the tee joint through the second pipeline, the styrene-acrylic emulsion and the water vapor are mixed in the tee joint to obtain a first gas-liquid mixture, the first gas-liquid mixture enters the static mixer through the third pipeline, the first gas-liquid mixture passes through the static mixer and then enters the fourth pipeline, the fourth pipeline enters the flash tank through the throttle valve, and the first gas-liquid mixture in the flash tank is subjected to gas-liquid separation under the action of ultrasonic waves emitted by the ultrasonic generator to obtain a first gas phase and a first liquid phase; the first liquid phase falls into the bottom of the flash tank under the action of gravity to obtain the monopropylene-styrene-removed emulsion, and the monopropylene-styrene-removed emulsion is discharged through a fifth pipeline; the first vapor phase upwards passes through a demister arranged at the upper part of the flash tank to enter the top of the flash tank, and enters a condenser through a sixth pipeline to be partially condensed to form a second vapor-liquid mixture; the second vapor-liquid mixture enters the condensate collecting tank through a seventh pipeline, and the second vapor-liquid mixture is subjected to vapor-liquid separation in the condensate collecting tank to obtain a second liquid phase and a second vapor phase; the second liquid phase falls into the bottom of the condensate collecting tank; the second vapor phase is discharged from the top of the condensate collecting tank to the vacuum-pumping system through an eighth pipeline;
the mass ratio of the styrene-acrylic emulsion to the water vapor is 5-15;
the absolute pressure of one end of the throttle valve close to the static mixer is 60-100 kPa;
the absolute pressure in the flash tank is 0.1-10 kPa.
2. The process according to claim 1, characterized in that: the frequency of the ultrasonic wave emitted by the ultrasonic wave generator is 25000-60000 Hz.
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| CN107936148A (en) * | 2017-12-26 | 2018-04-20 | 海安常州大学高新技术研发中心 | A kind of method that styrene-acrylic emulsion removes residual monomer |
| CN110862470B (en) * | 2019-12-02 | 2022-08-16 | 上海深化实业有限公司 | Devolatilization method of polyvinyl chloride resin for paste |
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