CN117065403B - Technology development and application treatment system and technology for removing VOCs gas in polymeric latex - Google Patents
Technology development and application treatment system and technology for removing VOCs gas in polymeric latex Download PDFInfo
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- CN117065403B CN117065403B CN202311341739.4A CN202311341739A CN117065403B CN 117065403 B CN117065403 B CN 117065403B CN 202311341739 A CN202311341739 A CN 202311341739A CN 117065403 B CN117065403 B CN 117065403B
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- 239000004816 latex Substances 0.000 title claims abstract description 66
- 229920000126 latex Polymers 0.000 title claims abstract description 66
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 50
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 238000011161 development Methods 0.000 title claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 124
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000178 monomer Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 52
- 239000002912 waste gas Substances 0.000 abstract description 11
- 239000011347 resin Substances 0.000 abstract description 9
- 229920005989 resin Polymers 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 238000009841 combustion method Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000007084 catalytic combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0036—Flash degasification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0042—Degasification of liquids modifying the liquid flow
- B01D19/0052—Degasification of liquids modifying the liquid flow in rotating vessels, vessels containing movable parts or in which centrifugal movement is caused
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0063—Regulation, control including valves and floats
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a technology development and application treatment system and technology for removing VOCs gas in polymerized latex, wherein the system comprises a recovery intermediate tank, a controller, a polymerization kettle, a discharge tank, a latex discharge pump, a first electromagnetic valve, a second electromagnetic valve, a forced recovery vinyl chloride monomer recovery system, a jacket, a hot water pipeline, a hot water pump and a stirrer; the method comprises the following steps: (1) feeding; (2) heating and stirring; and (3) discharging. The beneficial effects are that: the system has simple connection structure, realizes automatic control, reduces the discharge amount of VOCs waste gas in a dry waste gas discharge port, shortens the service cycle of the polymerization kettle, and improves the production capacity of the polymerization kettle; meanwhile, the effective recovery of resources is realized; the method is simple, avoids the environmental risk caused by out-of-standard emission, reduces the residual quantity of vinyl chloride monomer in the post paste resin product, and improves the quality of the post paste resin product.
Description
Technical Field
The invention relates to the technical field of industrial waste gas purification, in particular to a technology development and application treatment process for removing VOCs gas in polymer latex.
Background
At present, after the polymerization reaction of polyvinyl chloride paste resin is finished, 10% -20% of vinyl chloride monomer and 0.15% -0.32% of auxiliary agent are remained in the semi-finished latex, the monomer and the auxiliary agent are all non-methane total hydrocarbons (VOCs), the non-methane total hydrocarbons are discharged into the atmosphere from an exhaust gas discharge port in the subsequent drying production process of the semi-finished latex, the discharge limit value of the non-methane total hydrocarbons is 20mg/m according to the discharge standard requirement, and in the daily production process, when the existing drying production system does not adopt any control measure for full load production, the VOCs exhaust gas discharge value of the corresponding drying exhaust gas discharge port is about 60mg/m, the exhaust gas discharge requirement of the exhaust gas cannot be met, and at present, the VOCs exhaust gas is generally treated by adopting a direct-fired thermal oxidation furnace combustion method, a catalytic combustion method and an RTO incinerator combustion method, but the following problems exist in the 3 methods: 1. the combustion method of the direct-fired thermal oxidation furnace is used, the removal efficiency of VOCs waste gas is higher, the VOCs waste gas can be stably discharged after reaching standards, but the energy consumption is higher, the safety risk is higher, and the requirements on working conditions are high; 2. the catalytic combustion method is adopted, and because the catalyst is extremely easy to poison and lose efficacy and other factors, the catalyst has strict requirements on working conditions and waste gas components; 3. the RTO incinerator combustion method is high in treatment efficiency, but the cost of low-concentration VOCs treatment operation is high; therefore, the invention discloses a technology development and application treatment process for removing VOCs gas in the polymer latex, which can meet the exhaust emission requirement without combustion, and has no corresponding report at home and abroad.
Disclosure of Invention
The invention aims to provide a technology development and application treatment system for removing VOCs gas in polymerized latex, which has a simple connection structure and reduces the exhaust emission of VOCs in a dry exhaust emission port.
The invention aims to provide a technology development and application treatment process for removing VOCs gas in the polymerized latex, which is simple, avoids environmental risk caused by exceeding standard emission and improves the quality of the post paste resin product.
The first object of the invention is implemented by the following technical scheme: a technology development and application treatment system for removing VOCs gas in polymeric latex comprises a recovery intermediate tank and a controller; the discharge port of the polymeric kettle and the feed port of the discharge tank are respectively communicated with the feed port at the bottom of the recovery intermediate tank through a pipeline, a latex discharge pump and a first electromagnetic valve are arranged on the pipeline between the polymeric kettle and the recovery intermediate tank, a second electromagnetic valve is arranged on the pipeline between the discharge tank and the recovery intermediate tank, the discharge port of the discharge tank is communicated with the feed port of the drying production system, the exhaust port at the top of the recovery intermediate tank is communicated with the air inlet of the forced recovery pump, and the air outlet of the forced recovery pump is communicated with the vinyl chloride monomer recovery system; a jacket is sleeved and fixed on the outer wall of the recovery middle tank, and a hot water pipeline is communicated with a water inlet of the jacket through a hot water pump; a stirrer is arranged in the recovery middle tank; the signal output end of the controller is respectively connected with the signal input ends of the latex discharge pump, the first electromagnetic valve, the second electromagnetic valve, the hot water pump and the stirrer through signals.
Further, it also includes steam line, temperature sensor and pressure sensor; the steam pipeline is communicated with the water inlet of the jacket, a control valve is arranged on the steam pipeline, a temperature sensor and a pressure sensor are arranged in the recovery middle tank, signal output ends of the temperature sensor and the pressure sensor are connected with a signal input end of the controller through signals, and the signal output end of the controller is connected with the control valve and a signal input end of the forced recovery pump through signals respectively.
Further, an adjusting valve is arranged at the exhaust port of the recovery middle tank, and the signal output end of the controller is connected with the signal input end of the adjusting valve through signals.
Further, the intelligent water cooling device further comprises a cold water pipeline, wherein the cold water pipeline is communicated with a water inlet of the jacket through a cold water pump, and a signal output end of the controller is connected with a signal input end of the cold water pump through a signal.
Further, the device also comprises a recovery separation tank, a gas-liquid separator and a safe water sealed tank; the exhaust port of the recovery middle tank is communicated with the air inlet of the recovery separation tank, and the liquid outlet of the recovery separation tank is communicated with the liquid inlet of the recovery middle tank; the gas outlet of the recovery separation tank is communicated with the gas inlet of the forced recovery pump, the gas outlet of the forced recovery pump is communicated with the gas inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is communicated with the gas inlet of the safe water sealed tank, and the gas outlet of the safe water sealed tank is communicated with the vinyl chloride monomer recovery system.
The second purpose of the invention is implemented by the following technical scheme: a technology development and application treatment process for removing VOCs gas in polymeric latex is characterized by comprising the following steps:
(1) Feeding: the controller controls the latex discharge pump and the first electromagnetic valve to be opened, the semi-finished latex after the reaction in the polymerization kettle is pumped into the recovery intermediate tank under the action of the latex discharge pump, and after the feeding is finished, the controller controls the latex discharge pump and the first electromagnetic valve to be closed;
(2) Heating and stirring: the controller controls the hot water pump and the stirrer to be opened, the semi-finished latex in the recovery intermediate tank in the step (1) is heated and stirred for 3-4 hours, the heating temperature is 70-80 ℃, the stirring speed is 10-30r/min, the pressure in the recovery intermediate tank is kept at minus 0.075-minus 0.065MPa, VOCs gas is effectively removed from the semi-finished latex, and the controller controls the hot water pump and the stirrer to be closed after the set heating and stirring time is reached;
(3) Discharging: the controller controls the second electromagnetic valve to be opened, the semi-finished latex without VOCs gas in the step (2) is discharged into the discharge tank, after discharging is completed, the controller controls the second electromagnetic valve to be closed, and then the semi-finished latex in the discharge tank is sent into the drying production system for drying production.
Further, in the step (2), a temperature sensor detects the heating temperature in the recovery intermediate tank at any time and transmits a signal to the controller, and then the controller controls a control valve according to the temperature, and increases or decreases the steam inlet amount so as to ensure that the heating temperature in the recovery intermediate tank is in the range of 70-80 ℃; the pressure sensor detects the pressure in the recovery middle tank at any time and transmits a signal to the controller, and then the controller controls the forced recovery pump according to the pressure, and increases or decreases the power of the forced recovery pump so as to ensure that the pressure in the recovery middle tank is in the range of-0.075 to-0.065 MPa.
Further, in the step (2), the controller controls the opening of the regulating valve on the top exhaust port of the recovery tundish to be 30% in the initial stage; when heating and stirring are performed for 1h, the opening of the regulating valve is controlled to be 50% by the controller; when heating and stirring are carried out for 2 hours, the opening of the regulating valve is controlled to be 100% by the controller; when heating and stirring are stopped, the controller controls the regulating valve to be closed.
Further, in the step (2), the separated VOCs gas sequentially pass through a recovery separation tank to perform gas-liquid separation, the liquid returns to the recovery middle tank again, and the gas sequentially passes through a gas-liquid separator and a safe water seal tank and then enters a vinyl chloride monomer recovery system to recover vinyl chloride monomer by pumping of a forced recovery pump.
Further, in the step (3), the controller simultaneously controls the cold water pump to be turned on, and cold water is introduced into the jacket, so that the inner wall of the recovery intermediate tank is rapidly cooled to 40-50 ℃.
The invention has the advantages that:
1. the invention provides a technology development and application treatment system for removing VOCs gas in polymerized latex, which has a simple system connection structure and realizes automatic control, the polymerized semi-finished latex is discharged into a recovery intermediate tank to remove the VOCs gas in the recovery intermediate tank by adding the recovery intermediate tank, and then the semi-finished latex is sent into a subsequent drying production system to be dried and produced, so that the emission amount of the VOCs waste gas in a drying waste gas emission port is reduced.
2. The invention provides a technology development and application treatment system for removing VOCs gas in polymerization latex, which realizes the removal of the VOCs gas outside a polymerization kettle, and the normal use of the polymerization kettle is not affected while the VOCs gas is removed, so that the service cycle of the polymerization kettle is shortened, and the production capacity of the polymerization kettle is improved; and meanwhile, the recovered VOCs gas is sent to a vinyl chloride monomer recovery system for recovering vinyl chloride monomers, so that the effective recovery of resources is realized.
3. The invention provides a technology development and application treatment process for removing VOCs gas in polymeric latex, which has the advantages that the method is simple, the VOCs gas in semi-finished latex is effectively removed by heating and stirring in a recovery middle tank and negative pressure suction of a forced recovery pump, so that the standard emission of gaseous pollutants at a dry waste gas discharge port is realized, and the environmental risk caused by exceeding standard emission is effectively avoided; meanwhile, the residual quantity of vinyl chloride monomer in the post paste resin product is reduced, and the quality of the post paste resin product is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a system structure according to embodiment 1 of the present invention.
Fig. 2 is a system control block diagram of embodiment 1 of the present invention.
The recycling intermediate tank 1, the controller 2, the steam pipeline 3, the temperature sensor 4, the pressure sensor 5, the cold water pipeline 6, the recycling separation tank 7, the gas-liquid separator 8, the safe water sealed tank 9, the latex discharge pump 10, the first electromagnetic valve 11, the second electromagnetic valve 12, the drying production system 13, the regulating valve 14, the forced recycling pump 15, the vinyl chloride monomer recycling system 16, the jacket 17, the cold water pump 18, the hot water pipeline 19, the hot water pump 20, the stirrer 21, the control valve 22, the polymerizer 23 and the discharge tank 24.
Detailed Description
The present invention will be described in further detail by way of examples.
Example 1: as shown in fig. 1-2, a technology development and application treatment system for removing VOCs gas in a polymeric latex comprises a recovery intermediate tank 1, a controller 2, a steam pipeline 3, a temperature sensor 4, a pressure sensor 5, a cold water pipeline 6, a recovery separation tank 7, a gas-liquid separator 8 and a safe water seal tank 9; the discharge port of the polymerization kettle 23 and the feed port of the discharge tank 24 are respectively communicated with the feed port at the bottom of the recovery middle tank 1 through a pipeline, a latex discharge pump 10 and a first electromagnetic valve 11 are arranged on the pipeline between the polymerization kettle 23 and the recovery middle tank 1, a second electromagnetic valve 12 is arranged on the pipeline between the discharge tank 24 and the recovery middle tank 1, the discharge port of the discharge tank 24 is communicated with the feed port of the drying production system 13, an adjusting valve 14 is arranged at the exhaust port of the recovery middle tank 1, the exhaust port at the top of the recovery middle tank 1 is communicated with the air inlet of the recovery separation tank 7, and the liquid outlet of the recovery separation tank 7 is communicated with the liquid inlet of the recovery middle tank 1; the gas outlet of the recovery separation tank 7 is communicated with the gas inlet of the forced recovery pump 15, the gas outlet of the forced recovery pump 15 is communicated with the gas inlet of the gas-liquid separator 8, the gas outlet of the gas-liquid separator 8 is communicated with the gas inlet of the safe water-sealed tank 9, and the gas outlet of the safe water-sealed tank 9 is communicated with the vinyl chloride monomer recovery system 16.
A jacket 17 is sleeved and fixed on the outer wall of the recovery middle tank 1, and the cold water pipeline 6 is communicated with a water inlet of the jacket 17 through a cold water pump 18; the hot water pipeline 19 is communicated with the water inlet of the jacket 17 through a hot water pump 20; a stirrer 21 is provided in the recovery intermediate tank 1.
The steam pipeline 3 is communicated with a water inlet of the jacket 17, a control valve 22 is arranged on the steam pipeline 3, a temperature sensor 4 and a pressure sensor 5 are arranged in the recovery middle tank 1, signal output ends of the temperature sensor 4 and the pressure sensor 5 are connected with signal input ends of the controller 2 through signals, and signal output ends of the controller 2 are respectively connected with signal input ends of the latex discharge pump 10, the first electromagnetic valve 11, the second electromagnetic valve 12, the cold water pump 18, the hot water pump 20, the stirrer 21, the control valve 22, the forced recovery pump 15 and the regulating valve 14 through signals.
Example 2: the technology for removing VOCs gas from polymeric latex disclosed in example 1 was developed and applied to a treatment process comprising the steps of:
(1) Feeding: the controller 2 controls the latex discharge pump 10 and the first electromagnetic valve 11 to be opened, the semi-finished latex after the reaction in the polymerization kettle 23 is completely pumped into the recovery intermediate tank 1 under the action of the latex discharge pump 10, and after the feeding is completed, the controller 2 controls the latex discharge pump 10 and the first electromagnetic valve 11 to be closed;
(2) Heating and stirring: the controller 2 controls the hot water pump 20 and the stirrer 21 to be opened, the semi-finished latex in the recovery intermediate tank 1 in the step (1) is heated and stirred for 3-4 hours, the heating temperature is 70-80 ℃, the influence of yellowing of the latex caused by high temperature on the quality is avoided, meanwhile, the efficiency of stripping VOCs gas from the latex is improved, the stirring speed is 10-30r/min, the stripping efficiency of the VOCs gas from the latex is effectively improved, the pressure in the recovery intermediate tank 1 is kept at minus 0.075-minus 0.065MPa, the VOCs gas is effectively stripped from the semi-finished latex, and the controller 2 controls the hot water pump 20 and the stirrer 21 to be closed after the set heating and stirring time is reached.
The temperature sensor 4 detects the heating temperature in the recovery intermediate tank 1 at any time and transmits a signal to the controller 2, then the controller 2 controls the control valve 22 according to the temperature, and the ventilation quantity of steam is regulated to be larger or smaller so as to ensure that the heating temperature in the recovery intermediate tank 1 is in the range of 70-80 ℃, hot water is firstly adopted for heating, then steam is introduced for automatic heating regulation, steam can be saved, and meanwhile, the temperature of the jacket 17 can be ensured to be constant; the pressure sensor detects the pressure in the recovery middle tank 1 at any time and transmits a signal to the controller 2, and then the controller 2 controls the forced recovery pump 15 according to the pressure, and adjusts the power of the forced recovery pump 15 to be larger or smaller so as to ensure that the pressure in the recovery middle tank 1 is in the range of-0.075 to-0.065 MPa.
The controller 2 controls the opening of the regulating valve 14 on the top exhaust port of the recovery middle tank 1 to be 30% in the initial stage; when heating and stirring were performed for 1 hour, the controller 2 controlled the opening of the regulating valve 14 to be 50%; when heating and stirring were performed for 2 hours, the controller 2 controlled the opening of the regulating valve 14 to 100%; when the heating and stirring are stopped, the controller 2 controls the regulating valve 14 to be closed; the excessive opening of the regulating valve 14 at the beginning is prevented, so that a large amount of latex is pumped out, and the waste of the latex is caused.
The separated VOCs gas sequentially passes through the recovery separation tank 7 for gas-liquid separation, the liquid returns to the recovery middle tank 1 again, the gas passes through the forced recovery pump 15 for pumping, and then sequentially passes through the gas-liquid separator 8 and the safe water seal tank 9, and then enters the vinyl chloride monomer recovery system 16 for recovering vinyl chloride monomer.
(3) Discharging: the controller 2 controls the second electromagnetic valve 12 and the cold water pump 18 to be opened, the semi-finished latex with VOCs gas removed in the step (2) is discharged into the discharge tank 24, cold water is introduced into the jacket 17, the inner wall of the recovery intermediate tank 1 is rapidly cooled to 40-50 ℃, when the next kettle of latex is prevented from removing VOCs, the latex is prevented from being bonded to the inner wall of the recovery intermediate tank 1 due to the higher temperature in the jacket 17, the heat transfer effect is affected, the subsequent efficiency of removing VOCs in the latex is reduced, after discharging is completed, the controller 2 controls the second electromagnetic valve 12 and the cold water pump 18 to be closed, and then the semi-finished latex in the discharge tank 24 is conveyed into the drying production system 13 for drying production.
A paste resin production plant was put into test operation at 2022, 1/10 th day, the system disclosed in example 1 was put into test operation, and the exhaust gas from the dry exhaust gas discharge port was monitored on line, and the average value of the non-methane total hydrocarbon (VOCs) emission concentration values from 2022, 1/2022 to 2022, 12/12 was 10mg/m 3 About, far lower than "the emission limit value of 20mg/m of non-methane total hydrocarbon in caustic soda, polyvinyl chloride industrial pollutant emission standard" (GB 15581-2016), pollutant emission amount about 24t of whole year is reduced and discharged than before using, use the system disclosed by the invention, have reduced the emission amount of VOCs waste gas in the dry waste gas discharge port effectively.
Before the system disclosed in the embodiment 1 of the present invention is put into use, in order to ensure that the on-line monitoring index of the VOCs gas at the exhaust port of the dry waste gas meets the environmental protection requirement, the recovery time in the polymerization kettle 23 needs to be increased in the production process, namely, the recovery time is 8.5 hours/kettle, and after the system disclosed in the embodiment 1 of the present invention is put into use, the recovery time in the polymerization kettle 23 is shortened, namely, the recovery time is shortened to 6.5 hours/kettle, and the recovery time per kettle is saved by 2 hours. When the system disclosed in the embodiment 1 of the invention reaches the full-load operation state, the product is produced, the multiple feeding 166 kettles can be expected throughout the year, the accumulated lifting capacity is about 300t, and further the system disclosed by the invention shortens the service cycle of the polymerization kettle 23 and improves the production capacity of the polymerization kettle 23.
Before the process disclosed in the embodiment 2 of the invention is not applied, the residual vinyl chloride monomer in the produced paste resin product is about 10ppm, after the process disclosed in the embodiment 2 of the invention is applied, the content of VCM in latex is obviously reduced, the residual vinyl chloride monomer in the paste resin product can be synchronously reduced, and the residual vinyl chloride monomer is controlled below 5ppm in combination with the product quality inspection report data of 1 month in 2022 so far, thereby further improving the customer satisfaction while meeting the national standard requirement.
The foregoing is a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that modifications and variations can be made without departing from the principles of the present invention, and such modifications and variations are to be regarded as being within the scope of the invention.
Claims (5)
1. A technology development and application treatment process for removing VOCs gas in polymeric latex is characterized in that a treatment system comprises a recovery intermediate tank, a cold water pipeline and a controller; the discharge port of the polymeric kettle and the feed port of the discharge tank are respectively communicated with the feed port at the bottom of the recovery intermediate tank through a pipeline, a latex discharge pump and a first electromagnetic valve are arranged on the pipeline between the polymeric kettle and the recovery intermediate tank, a second electromagnetic valve is arranged on the pipeline between the discharge tank and the recovery intermediate tank, the discharge port of the discharge tank is communicated with the feed port of the drying production system, the exhaust port at the top of the recovery intermediate tank is communicated with the air inlet of the forced recovery pump, and a regulating valve is arranged at the exhaust port of the recovery intermediate tank; the air outlet of the forced recovery pump is communicated with a vinyl chloride monomer recovery system; a jacket is sleeved and fixed on the outer wall of the recovery middle tank, a hot water pipeline is communicated with a water inlet of the jacket through a hot water pump, and a cold water pipeline is communicated with a water inlet of the jacket through a cold water pump; a stirrer is arranged in the recovery middle tank; the signal output end of the controller is respectively connected with the signal input ends of the latex discharge pump, the first electromagnetic valve, the second electromagnetic valve, the hot water pump, the stirrer, the regulating valve and the cold water pump through signals;
the technology development and application treatment process for removing VOCs gas in the polymeric latex by utilizing the treatment system specifically comprises the following steps:
(1) Feeding: the controller controls the latex discharge pump and the first electromagnetic valve to be opened, the semi-finished latex after the reaction in the polymerization kettle is pumped into the recovery intermediate tank under the action of the latex discharge pump, and after the feeding is finished, the controller controls the latex discharge pump and the first electromagnetic valve to be closed;
(2) Heating and stirring: the controller controls the hot water pump and the stirrer to be opened, the semi-finished latex in the recovery intermediate tank in the step (1) is heated and stirred for 3-4 hours, the heating temperature is 70-80 ℃, the stirring speed is 10-30r/min, the pressure in the recovery intermediate tank is kept at minus 0.075-minus 0.065MPa, VOCs gas is effectively removed from the semi-finished latex, and the controller controls the hot water pump and the stirrer to be closed after the set heating and stirring time is reached;
the controller controls the opening of the regulating valve on the exhaust port at the top of the recovery middle tank to be 30% in the initial stage; when heating and stirring are performed for 1h, the opening of the regulating valve is controlled to be 50% by the controller; when heating and stirring are carried out for 2 hours, the opening of the regulating valve is controlled to be 100% by the controller; when heating and stirring are stopped, the controller controls the regulating valve to be closed;
(3) Discharging: the controller controls the second electromagnetic valve to be opened, the semi-finished latex without VOCs gas in the step (2) is discharged into the discharge tank, after discharging is completed, the controller controls the second electromagnetic valve to be closed, and then the semi-finished latex in the discharge tank is sent into a drying production system for drying production; the controller simultaneously controls the cold water pump to be turned on, and cold water is introduced into the jacket, so that the inner wall of the recovery intermediate tank is rapidly cooled to 40-50 ℃.
2. The process for the development and application of a technology for removing VOCs gas from polymeric latex according to claim 1, further comprising a steam line, a temperature sensor and a pressure sensor; the steam pipeline is communicated with the water inlet of the jacket, a control valve is arranged on the steam pipeline, a temperature sensor and a pressure sensor are arranged in the recovery middle tank, signal output ends of the temperature sensor and the pressure sensor are connected with a signal input end of the controller through signals, and the signal output end of the controller is connected with the control valve and a signal input end of the forced recovery pump through signals respectively.
3. The technology development and application process for removing VOCs gas from polymeric latex according to claim 1, further comprising a recovery separation tank, a gas-liquid separator and a safe water-sealed tank; the exhaust port of the recovery middle tank is communicated with the air inlet of the recovery separation tank, and the liquid outlet of the recovery separation tank is communicated with the liquid inlet of the recovery middle tank; the gas outlet of the recovery separation tank is communicated with the gas inlet of the forced recovery pump, the gas outlet of the forced recovery pump is communicated with the gas inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is communicated with the gas inlet of the safe water sealed tank, and the gas outlet of the safe water sealed tank is communicated with the vinyl chloride monomer recovery system.
4. The process for developing and applying a technology for removing VOCs gas from a polymer latex according to claim 2, wherein in the step (2), a temperature sensor detects the heating temperature in the recovery intermediate tank at any time and transmits a signal to the controller, and then the controller controls a control valve according to the temperature, and increases or decreases the amount of steam introduced to ensure that the heating temperature in the recovery intermediate tank is in the range of 70-80 ℃; the pressure sensor detects the pressure in the recovery middle tank at any time and transmits a signal to the controller, and then the controller controls the forced recovery pump according to the pressure, and increases or decreases the power of the forced recovery pump so as to ensure that the pressure in the recovery middle tank is in the range of-0.075 to-0.065 MPa.
5. The development and application process for removing VOCs from polymeric latex according to claim 3, wherein in step (2), the separated VOCs are sequentially subjected to gas-liquid separation in a recovery separation tank, the liquid is returned to the recovery intermediate tank again, and the gas is pumped by a forced recovery pump, sequentially passes through a gas-liquid separator and a safe water seal tank, and then enters a vinyl chloride monomer recovery system to recover vinyl chloride monomer.
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