CN115212782B - Polycarbonate batching method and automatic control system thereof - Google Patents
Polycarbonate batching method and automatic control system thereof Download PDFInfo
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- CN115212782B CN115212782B CN202110418838.2A CN202110418838A CN115212782B CN 115212782 B CN115212782 B CN 115212782B CN 202110418838 A CN202110418838 A CN 202110418838A CN 115212782 B CN115212782 B CN 115212782B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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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
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
According to the automatic control system for polycarbonate and the batching method based on the automatic control system, the automatic and accurate batching of polycarbonate is realized by controlling the automatic control system and one-key start-stop bisphenol A, solvent and auxiliary agent metering and feeding equipment, the problems that manual operation is adopted for polycarbonate batching in the prior art, misoperation is easy to occur due to manual high-frequency intervention and operation, inaccurate raw material metering, shortage and the like are solved, the labor intensity of operators is greatly reduced, accidents caused by improper operation are avoided, the safety, the accuracy and the high efficiency of a batching process are ensured, and the production efficiency and the automation degree of polycarbonate are greatly improved.
Description
Technical Field
The invention relates to the technical field of chemical equipment and instrument automation, in particular to a polycarbonate batching method and an automatic control system thereof.
Background
At present, along with popularization and application of polycarbonate products, the demand of polycarbonate products in domestic and foreign markets is larger, but the continuous and automatic degree of polycarbonate production lines is generally lower. The polycarbonate production process has the advantages of large dust, inflammability, explosiveness, strong corrosiveness, more harmful and toxic substances, poor charging continuity and large labor intensity of staff operation, and the polycarbonate material preparing process adopts manual starting and stopping equipment for material preparation and charging. In the operation process, not only the time change of reaction and the weight change of raw materials in a metering hopper are required to be monitored, but also the interlocking is required to be frequently and manually thrown, and each rotating device is started and stopped, a valve is opened and closed, and the opening of the valve is manually adjusted. Each reaction kettle is prepared and fed by manual multi-step operation. The automatic control operation staff needs to operate various devices and valves for multiple times, misoperation is easy to be caused by high-strength manual operation, the standby weight, the pulling weight and the batching are long, the rotating device cannot stop in time, even a series of abnormal phenomena such as inaccurate raw material metering and material shortage occur, the labor intensity is increased, the energy loss is caused, the device is damaged when serious, the production is influenced, and the potential safety hazard exists. Today, when information and automatic control technology are developed abnormally, the lagging batching mode in the polycarbonate industry cannot adapt to the rapid development of polycarbonate production and application, and development of an automatic batching system for polycarbonate and a batching method based on the automatic batching system are urgent.
Disclosure of Invention
Aiming at the defects that the polycarbonate is mainly prepared by manual operation, the intervention and operation of manual high frequency are easy to cause misoperation and inaccurate raw material metering and material shortage in the prior art, the invention provides a polycarbonate preparation method and an automatic control system thereof.
The method is characterized in that: the automatic control system for the polycarbonate ingredients comprises a bisphenol A feeding module, a solvent primary feeding module, an auxiliary agent feeding module and a solvent secondary feeding module; the method for preparing the polycarbonate is based on the automatic control system, and realizes one-key start and stop according to the preset command signals through the cooperative linkage of all modules, so as to finish the method for preparing the polycarbonate accurately; the solvent is one of dichloromethane, dichloroethane and chlorobenzene which are common solvents for dissolving bisphenol A in the production process of polycarbonate; the auxiliary agent is a catalyst, a blocking agent and an iron removing agent which are added in the production process of the polycarbonate;
the bisphenol A feeding module and the bisphenol A feeding module are connected with the accurate metering feeding equipment, the DCS or PLC controller and the digital controller in an interactive way by a control loop and are used for finishing the accurate metering feeding of bisphenol A materials serving as main raw materials for producing the polycarbonate; wherein the precise metering and feeding equipment is a weightless type feeder or a combined feeder in the prior art; the combined feeder is a feeder which is formed by combining and cooperating a bisphenol A storage bin, a weighing hopper, a loss scale and a screw propeller;
the solvent primary feeding module and the solvent secondary feeding module are connected with a solvent storage tank, a solvent flowmeter, a solvent regulating valve, a solvent stop valve, a DCS or PLC controller and a digital controller in an interactive way through a control loop;
the solvent primary feeding module is connected with a solvent storage tank, a solvent flowmeter, a solvent regulating valve, a solvent stop valve, a DCS or PLC controller and a digital controller in an interactive way through a control loop; when the solvent primary feeding module receives an instruction and starts to feed solvent into the batching kettle, the solvent flowmeter starts to meter the addition amount of the solvent, and as the addition amount increases, the solvent regulating valve starts to work, the opening of the valve is reduced, the added solvent amount is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset primary solvent addition amount, the solvent stop valve is triggered to be closed, and the primary solvent addition operation is stopped;
the auxiliary agent feeding module is connected with an auxiliary agent storage tank, an auxiliary agent flowmeter, an auxiliary agent regulating valve, an auxiliary agent stop valve, a DCS or PLC controller and a digital controller in an interactive way through a control loop; when the auxiliary agent feeding module receives an instruction and starts to add auxiliary agents into the batching kettle, the auxiliary agent flowmeter starts to meter the addition amount of the auxiliary agents, and as the addition amount increases, the auxiliary agent regulating valve starts to work, the opening of the valve is regulated to further accurately control the addition amount of the auxiliary agents when the addition amount reaches a set value, and when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset addition amount of the auxiliary agents, the auxiliary agent stop valve is triggered to be closed, and the addition operation of the auxiliary agents is stopped; the auxiliary agent is a catalyst, a blocking agent and an iron removing agent which are added in the production process of the polycarbonate and are sequentially added according to the process requirements;
the solvent secondary feeding module is connected with the solvent storage tank, the solvent flowmeter, the solvent regulating valve, the solvent stop valve, the DCS or PLC controller and the digital controller in an interactive way through a control loop; when the solvent secondary feeding module receives an instruction and starts to add secondary solvent into the batching kettle, the solvent flowmeter starts to meter the adding amount of the solvent, and as the adding amount increases, the solvent regulating valve starts to work and reduces the opening of the valve when the adding amount reaches a set value, the adding amount of the solvent is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset adding amount of the secondary solvent, the solvent stop valve is triggered to be closed, and the secondary adding operation of the solvent is stopped;
the method for preparing the polycarbonate comprises the following specific processes:
step 1: setting a start-stop signal; according to the formula of the polycarbonate production process, calculating the amount of bisphenol A, solvent added for the first time, solvent added for the second time and auxiliary agent needed to be added; setting start-stop signal values of accurate metering feeding equipment, a solvent storage tank and an auxiliary agent storage tank according to the required adding amount of different raw materials;
step 2: calibrating accurate metering and charging equipment; in the preparation stage of batching, a bisphenol A feeding module and a feeding module are started in sequence, so that bisphenol A materials are fully filled in accurate metering and feeding equipment, and when batching operation is started, the added bisphenol A materials are prevented from deviation or fluctuation caused by material shortage of a dead bin of a weightless feeder or a screw propeller of a combined feeder, and accurate feeding is realized;
step 3: adding the solvent once; calling a solvent primary feeding module according to a preset program to finish primary solvent feeding in the batching kettle; triggering the operation of adding the solvent once to stop when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent once adding amount;
step 4: bisphenol A is added; the bisphenol A feeding module is called to finish the quantitative feeding of bisphenol A; triggering the operation of adding bisphenol A to stop when the difference value of two times of weighing before and after the accurate metering and charging equipment is equal to or larger than the preset formula demand of bisphenol A;
step 5: adding an auxiliary agent; calling an auxiliary agent feeding module to finish the addition of the auxiliary agent; according to the process requirements, adding a catalyst, a blocking agent and an iron remover according to a preset program; triggering the operation of adding the auxiliary agent to stop when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent formula demand;
step 6: dissolving and stirring; starting a stirrer, and uniformly mixing the primary solvent, the bisphenol A and the auxiliary agent added into a batching kettle to finish preliminary batching after the bisphenol A is fully dissolved in the primary solvent and the auxiliary agent, so as to obtain a mixed solution; opening a discharging valve, and adding the mixed solution in the batching kettle into the reaction kettle;
step 7: adding the solvent for the second time; calling a solvent secondary feeding module to finish secondary feeding of the solvent in the batching kettle; triggering the operation of secondary solvent addition to stop when the accumulated value of the solvent flowmeter is equal to or greater than the preset secondary solvent addition amount;
step 8: flushing; starting a stirrer, flushing bisphenol A and an auxiliary agent adhered on the kettle wall of the batching kettle, ensuring that no material loss is caused by the batching process, after the preset flushing time is reached, flushing the bisphenol A and the auxiliary agent adhered on the kettle wall of the batching kettle completely, opening a discharging valve, and adding a solvent added secondarily in the batching kettle, the bisphenol A and the auxiliary agent flushed from the kettle wall into a reaction kettle together to finish the batching operation of the polycarbonate.
The beneficial effects are that:
according to the polycarbonate batching automatic control system and the batching method based on the automatic control system, by means of control of the automatic control system, the metering and feeding equipment of bisphenol A, solvent and auxiliary agent is started and stopped in one key, automatic and accurate batching of polycarbonate is achieved, the problems that in the prior art, manual operation is adopted for batching of polycarbonate, misoperation is easy to occur due to manual high-frequency intervention and operation, inaccurate raw material metering, material shortage and the like are caused, labor intensity of operators is greatly reduced, accidents caused by improper operation are avoided, safety, accuracy and high efficiency in batching process are guaranteed, and production efficiency and automation degree of polycarbonate are greatly improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a layout of the apparatus for the combination feeder in embodiment 1 of the present invention;
in the figure: 1. bisphenol a silo; 2. a primary screw propeller; 3. a blanking valve A;4. weighing a hopper; 5. losing weight; 6. a secondary screw propeller; 7. a blanking valve B;8. a solvent storage tank; 9. a solvent flow meter; 10. a solvent regulating valve; 11. a solvent stop valve; 12. a stirrer; 13. a batching kettle; 14. an auxiliary agent storage tank; 15. an auxiliary agent flowmeter; 16. an auxiliary agent regulating valve; 17. an auxiliary agent stop valve; 18. and a discharging valve.
Detailed Description
The invention will be further described with reference to the drawings and specific examples.
Example 1:
the invention provides a method for preparing polycarbonate and an automatic control system thereof.
The method is characterized in that: the automatic control system for the polycarbonate ingredients comprises a bisphenol A feeding module, a solvent primary feeding module, an auxiliary agent feeding module and a solvent secondary feeding module; the method for preparing the polycarbonate is based on the automatic control system, and realizes the one-key start and stop of each device controlled by the automatic control system according to the preset command signals through the cooperative linkage of each module, thereby completing the method for preparing the polycarbonate accurately;
the solvent is one of dichloromethane, dichloroethane and chlorobenzene which are common solvents for dissolving bisphenol A in the production process of polycarbonate; the auxiliary agent is a catalyst, a blocking agent and an iron removing agent which are added in the production process of the polycarbonate; in this example, the solvent is methylene chloride; the catalyst is triethylamine, the end capping agent is phenol, and the iron removing agent is sodium glutamate;
the bisphenol A feeding module and the bisphenol A feeding module are connected with the accurate metering feeding equipment, the DCS or PLC controller and the digital controller in an interactive way by a control loop and are used for finishing the accurate metering feeding of bisphenol A materials serving as main raw materials for producing the polycarbonate;
the precise metering and charging device in the embodiment is a combined feeder; the combined feeder is a feeder which is formed by combining and cooperating a bisphenol A storage bin, a weighing hopper, a loss scale and a screw propeller;
the screw propeller is divided into a primary screw propeller and a secondary screw propeller which are respectively connected to the bottoms of the bisphenol A storage bin and the weighing hopper and used for conveying bisphenol A serving as a main raw material into the weighing hopper and the batching kettle;
the bisphenol A bin is provided with a level indicator, a high level value and a low level value are set in the bisphenol A feeding module according to the capacity of the bisphenol A bin, and when the level indicator indicating value of the bisphenol A bin reaches the low level value, the bisphenol A bin is fed; stopping feeding the bisphenol A storage bin when the level indicator of the bisphenol A storage bin reaches a high level value; the bottom of the bisphenol A bin is connected with a first-stage screw propeller, and is used for conveying bisphenol A serving as a main raw material into the weighing hopper, and a blanking valve A is arranged at the joint of the first-stage screw propeller and the weighing hopper and is used for cutting off the feeding of the first-stage screw propeller into the weighing hopper;
the weighing hopper and the loss weighing device work cooperatively to finish the real-time weighing of bisphenol A materials added in the weighing hopper; the bottom of the weighing hopper is connected with a secondary screw propeller, and is used for conveying bisphenol A serving as a main raw material into the batching kettle, and a blanking valve B is arranged at the joint of the secondary screw propeller and the batching kettle and is used for cutting off the feeding of the secondary screw propeller into the batching kettle;
the bisphenol A feeding module is in interactive connection with the weighing hopper, the loss scale, the secondary screw propeller, the blanking valve B, DCS or the PLC and the digital controller through a control loop and is used for finishing accurate metering and feeding of bisphenol A materials to the batching kettle through the weighing hopper; when the bisphenol A feeding module receives a command, the blanking valve B is opened, the secondary screw propeller works, bisphenol A starts to be added into the batching kettle, and when the difference value of two times of weighing before and after the loss of the weighing is equal to or larger than the preset formula demand of bisphenol A, the blanking valve B is triggered to be closed immediately, and the bisphenol A feeding operation is stopped;
the bisphenol A material supplementing module is connected with a bisphenol A material bin, a primary screw propeller, a blanking valve A, DCS or a PLC controller and a digital controller in an interactive way by a control loop and is used for completing the supplement of the bisphenol A material bin to the weighing hopper and the material supplement of the bisphenol A material bin; when the material level of the weighing hopper reaches the low material level value of the weighing hopper, triggering the blanking valve B to be closed immediately, simultaneously receiving an instruction by the bisphenol A material supplementing module, opening the blanking valve A, starting the operation of the first-stage screw propeller, supplementing bisphenol A into the weighing hopper, and when the material level of the weighing hopper reaches the high material level value of the weighing hopper, triggering the blanking valve A to be closed immediately, and stopping the bisphenol A material supplementing operation; when the material level of the bisphenol A material bin reaches a low material level value of the bisphenol A material bin, the bisphenol A material supplementing module gives an instruction to start material supplementing to the bisphenol A material bin, and the material supplementing action of the bisphenol A material bin is stopped until the material level of the bisphenol A material bin reaches a high material level value of the bisphenol A material bin;
the solvent primary feeding module is connected with a solvent storage tank, a solvent flowmeter, a solvent regulating valve, a solvent stop valve, a DCS or PLC controller and a digital controller in an interactive way through a control loop; when the solvent primary feeding module receives an instruction and begins to feed primary solvent into the batching kettle, the solvent flowmeter begins to meter the addition amount of the solvent, and as the addition amount increases, the solvent regulating valve begins to work and reduces the opening of the valve when the addition amount reaches a set value, the added solvent amount is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset solvent primary addition amount, the solvent stop valve is triggered to be closed, and the primary solvent addition operation is stopped;
the auxiliary agent feeding module is connected with an auxiliary agent storage tank, an auxiliary agent flowmeter, an auxiliary agent regulating valve, an auxiliary agent stop valve, a DCS or PLC controller and a digital controller in an interactive way through a control loop; when the auxiliary agent feeding module receives an instruction and starts to add auxiliary agents into the batching kettle, the auxiliary agent flowmeter starts to meter the addition amount of the auxiliary agents, and as the addition amount increases, the auxiliary agent regulating valve starts to work, the opening of the valve is regulated to further accurately control the addition amount of the auxiliary agents when the addition amount reaches a set value, and when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset addition amount of the auxiliary agents, the auxiliary agent stop valve is triggered to be closed, and the addition operation of the auxiliary agents is stopped; the auxiliary agent is catalyst triethylamine, end capping agent phenol and iron removing agent sodium glutamate which are added in the polycarbonate production process, and the auxiliary agent is sequentially added according to the process requirements;
the solvent secondary feeding module is connected with the solvent storage tank, the solvent flowmeter, the solvent regulating valve, the solvent stop valve, the DCS or PLC controller and the digital controller in an interactive way through a control loop; when the solvent secondary feeding module receives an instruction and starts to add secondary solvent into the batching kettle, the solvent flowmeter starts to meter the adding amount of the solvent, and as the adding amount increases, the solvent regulating valve starts to work and reduces the opening of the valve when the adding amount reaches a set value, the added solvent amount is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset solvent secondary adding amount, the solvent stop valve is triggered to be closed, and the secondary adding operation of the solvent is stopped;
the method for preparing the polycarbonate comprises the following specific processes:
step 1: setting a start-stop signal; according to the formula of the polycarbonate production process, calculating the amount of bisphenol A, solvent added for the first time, solvent added for the second time and auxiliary agent needed to be added; setting start-stop signal values of the combined feeder, the solvent storage tank and the auxiliary agent storage tank according to the required adding amount of different raw materials;
step 2: calibrating a combined feeder; in the preparation stage of batching, a bisphenol A feeding module and a feeding module are started in sequence, so that bisphenol A materials are filled in the combined feeder, and when batching operation is started, the added bisphenol A materials are prevented from deviation or fluctuation caused by the shortage of materials of a first-stage screw propeller and a second-stage screw propeller of the combined feeder, and accurate feeding is realized;
step 3: adding the solvent once; calling a solvent primary feeding module according to a preset program to finish primary solvent feeding in the batching kettle; when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent one-time adding amount, triggering the solvent stop valve to be closed, and stopping one-time adding operation of the solvent;
step 4: bisphenol A is added; the bisphenol A feeding module is called to finish the quantitative feeding of bisphenol A; when the difference value of the two times of weighing before and after the loss weighing is equal to or larger than the preset formula demand of bisphenol A, triggering the blanking valve B to be closed immediately, and stopping the operation of adding the bisphenol A;
step 5: adding an auxiliary agent; calling an auxiliary agent feeding module to finish the addition of the auxiliary agent; according to the process requirements, adding a catalyst triethylamine, a capping agent phenol and an iron removing agent sodium glutamate according to a preset program; when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the formula demand of the preset catalyst, end capping agent and iron removing agent, triggering the auxiliary agent stop valve to close, and stopping the auxiliary agent adding operation;
step 6: dissolving and stirring; starting a stirrer, and uniformly mixing the primary solvent, the bisphenol A and the auxiliary agent added into a batching kettle to finish preliminary batching after the bisphenol A is fully dissolved in the primary solvent and the auxiliary agent, so as to obtain a mixed solution; opening a discharging valve, and adding the mixed solution in the batching kettle into the reaction kettle;
step 7: adding the solvent for the second time; calling a solvent secondary feeding module to finish secondary feeding of the solvent in the batching kettle; when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent secondary adding amount, triggering the solvent stop valve to be closed, and stopping the solvent secondary adding operation;
step 8: flushing; starting a stirrer, flushing bisphenol A and an auxiliary agent adhered on the kettle wall of the batching kettle, ensuring that no material loss is caused in the batching process, after the preset flushing time is reached, flushing the bisphenol A and the auxiliary agent adhered on the kettle wall of the batching kettle completely, opening a discharging valve, adding a solvent added in the batching kettle for the second time, and adding the bisphenol A, a catalyst, a blocking agent and an iron removing agent flushed from the kettle wall into a reaction kettle together, thereby finishing the batching operation of the polycarbonate.
Claims (9)
1. An automatic control system for polycarbonate batch is characterized in that,
the device comprises a bisphenol A feeding module, a solvent primary feeding module, an auxiliary agent feeding module and a solvent secondary feeding module;
the bisphenol A feeding module and the bisphenol A feeding module are connected with the accurate metering feeding equipment, the DCS or PLC controller and the digital controller in an interactive way by a control loop and are used for finishing the accurate metering feeding of bisphenol A materials serving as main raw materials for producing the polycarbonate;
the solvent primary feeding module and the solvent secondary feeding module are connected with a solvent storage tank, a solvent flowmeter, a solvent regulating valve, a solvent stop valve, a DCS or PLC controller and a digital controller in an interactive way by a control loop and are used for finishing the feeding of the solvent used for producing the polycarbonate;
the auxiliary agent feeding module is in interactive connection with an auxiliary agent storage tank, an auxiliary agent flowmeter, an auxiliary agent regulating valve, an auxiliary agent stop valve, a DCS or PLC controller and a digital controller through a control loop and is used for finishing feeding of auxiliary agent used for producing polycarbonate;
the solvent is one of dichloromethane, dichloroethane and chlorobenzene which are common solvents for dissolving bisphenol A in the production process of polycarbonate; the auxiliary agent is a catalyst, a blocking agent and an iron removing agent which are added in the production process of the polycarbonate.
2. An autonomous system of polycarbonate formulations as claimed in claim 1, wherein,
the precise metering and feeding equipment is a weightless feeder or a combined feeder in the prior art; the combined feeder is a feeder which is formed by combining and cooperating a bisphenol A storage bin, a weighing hopper, a loss scale and a screw propeller; the screw propeller is divided into a first-stage screw propeller and a second-stage screw propeller which are respectively connected to the bottoms of the bisphenol A storage bin and the weighing hopper and used for conveying bisphenol A serving as a main raw material into the weighing hopper and the batching kettle.
3. An autonomous system of polycarbonate formulations as claimed in claim 1 or 2, characterized in that,
when the solvent primary feeding module receives an instruction and starts to feed solvent into the batching kettle, the solvent flowmeter starts to meter the addition amount of the solvent, and as the addition amount increases, the solvent regulating valve starts to work and reduces the opening of the valve when the addition amount reaches a set value, the added solvent amount is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset primary solvent addition amount, the solvent stop valve is triggered to be closed, and the primary solvent addition operation is stopped;
when the auxiliary agent feeding module receives an instruction and starts to add auxiliary agents into the batching kettle, the auxiliary agent flowmeter starts to meter the addition amount of the auxiliary agents, and as the addition amount increases, the auxiliary agent regulating valve starts to work and reduces the opening of the valve when the addition amount reaches a set value, the added auxiliary agent amount is further accurately controlled, and when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent addition amount, the auxiliary agent stop valve is triggered to be closed, and the addition operation of the auxiliary agents is stopped; the auxiliary agent is a catalyst, a blocking agent and an iron removing agent which are added in the production process of the polycarbonate and are sequentially added according to the process requirements;
when the solvent secondary feeding module receives an instruction and starts to add secondary solvent into the batching kettle, the solvent flowmeter starts to meter the adding amount of the solvent, and as the adding amount increases, the solvent regulating valve starts to work and reduces the opening of the valve when reaching a set value, the adding amount of the solvent is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset adding amount of the secondary solvent, the solvent stop valve is triggered to be closed, and the secondary adding operation of the solvent is stopped.
4. An autonomous system of polycarbonate formulation according to claim 2, wherein,
the bisphenol A bin is provided with a level indicator, a high level value and a low level value are set in the bisphenol A feeding module according to the capacity of the bisphenol A bin, and when the level indicator indicating value of the bisphenol A bin reaches the low level value, the bisphenol A bin is fed; stopping feeding the bisphenol A storage bin when the level indicator of the bisphenol A storage bin reaches a high level value; the bottom of the bisphenol A bin is connected with a first-stage screw propeller, and is used for conveying bisphenol A serving as a main raw material into the weighing hopper, and a blanking valve A is arranged at the joint of the first-stage screw propeller and the weighing hopper and is used for cutting off the feeding of the first-stage screw propeller into the weighing hopper;
the weighing hopper and the loss weighing device work cooperatively to finish the real-time weighing of bisphenol A materials added in the weighing hopper; the bottom of the weighing hopper is connected with a secondary screw propeller, and is used for conveying bisphenol A serving as a main raw material into the batching kettle, and a blanking valve B is arranged at the joint of the secondary screw propeller and the batching kettle and is used for cutting off the feeding of the secondary screw propeller into the batching kettle;
the bisphenol A feeding module is in interactive connection with the weighing hopper, the loss scale, the secondary screw propeller, the blanking valve B, DCS or the PLC and the digital controller through a control loop and is used for finishing accurate metering and feeding of bisphenol A materials to the batching kettle through the weighing hopper; when the bisphenol A feeding module receives a command, the blanking valve B is opened, the secondary screw propeller works, bisphenol A starts to be added into the batching kettle, and when the difference value of two times of weighing before and after the loss of the weighing is equal to or larger than the preset formula demand of bisphenol A, the blanking valve B is triggered to be closed immediately, and the bisphenol A feeding operation is stopped;
the bisphenol A material supplementing module is connected with a bisphenol A material bin, a primary screw propeller, a blanking valve A, DCS or a PLC controller and a digital controller in an interactive way by a control loop and is used for completing the supplement of the bisphenol A material bin to the weighing hopper and the material supplement of the bisphenol A material bin; when the material level of the weighing hopper reaches the low material level value of the weighing hopper, triggering the blanking valve B to be closed immediately, simultaneously receiving an instruction by the bisphenol A material supplementing module, opening the blanking valve A, starting the operation of the first-stage screw propeller, supplementing bisphenol A into the weighing hopper, and when the material level of the weighing hopper reaches the high material level value of the weighing hopper, triggering the blanking valve A to be closed immediately, and stopping the bisphenol A material supplementing operation; when the material level of the bisphenol A material bin reaches the low material level value of the bisphenol A material bin, the bisphenol A material supplementing module gives an instruction to start material supplementing to the bisphenol A material bin, and the material supplementing action of the bisphenol A material bin is stopped until the material level of the bisphenol A material bin reaches the high material level value of the bisphenol A material bin.
5. An autonomous system of polycarbonate formulation according to claim 2, wherein,
the bisphenol A bin is provided with a level indicator, a high level value and a low level value are set in the bisphenol A feeding module according to the capacity of the bisphenol A bin, and when the level indicator indicating value of the bisphenol A bin reaches the low level value, the bisphenol A bin is fed; stopping feeding the bisphenol A storage bin when the level indicator of the bisphenol A storage bin reaches a high level value; the bottom of the bisphenol A bin is connected with a first-stage screw propeller, and is used for conveying bisphenol A serving as a main raw material into the weighing hopper, and a blanking valve A is arranged at the joint of the first-stage screw propeller and the weighing hopper and is used for cutting off the feeding of the first-stage screw propeller into the weighing hopper;
the weighing hopper and the loss weighing device work cooperatively to finish the real-time weighing of bisphenol A materials added in the weighing hopper; the bottom of the weighing hopper is connected with a secondary screw propeller, and is used for conveying bisphenol A serving as a main raw material into the batching kettle, and a blanking valve B is arranged at the joint of the secondary screw propeller and the batching kettle and is used for cutting off the feeding of the secondary screw propeller into the batching kettle;
the bisphenol A feeding module is in interactive connection with the weighing hopper, the loss scale, the secondary screw propeller, the blanking valve B, DCS or the PLC and the digital controller through a control loop and is used for finishing accurate metering and feeding of bisphenol A materials to the batching kettle through the weighing hopper; when the bisphenol A feeding module receives a command, the blanking valve B is opened, the secondary screw propeller works, bisphenol A starts to be added into the batching kettle, and when the difference value of two times of weighing before and after the loss of the weighing is equal to or larger than the preset formula demand of bisphenol A, the blanking valve B is triggered to be closed immediately, and the bisphenol A feeding operation is stopped;
the bisphenol A material supplementing module is connected with a bisphenol A material bin, a primary screw propeller, a blanking valve A, DCS or a PLC controller and a digital controller in an interactive way by a control loop and is used for completing the supplement of the bisphenol A material bin to the weighing hopper and the material supplement of the bisphenol A material bin; when the material level of the weighing hopper reaches the low material level value of the weighing hopper, triggering the blanking valve B to be closed immediately, simultaneously receiving an instruction by the bisphenol A material supplementing module, opening the blanking valve A, starting the operation of the first-stage screw propeller, supplementing bisphenol A into the weighing hopper, and when the material level of the weighing hopper reaches the high material level value of the weighing hopper, triggering the blanking valve A to be closed immediately, and stopping the bisphenol A material supplementing operation; when the material level of the bisphenol A material bin reaches a low material level value of the bisphenol A material bin, the bisphenol A material supplementing module gives an instruction to start material supplementing to the bisphenol A material bin, and the material supplementing action of the bisphenol A material bin is stopped until the material level of the bisphenol A material bin reaches a high material level value of the bisphenol A material bin;
when the solvent primary feeding module receives an instruction and starts to feed solvent into the batching kettle, the solvent flowmeter starts to meter the addition amount of the solvent, and as the addition amount increases, the solvent regulating valve starts to work and reduces the opening of the valve when the addition amount reaches a set value, the added solvent amount is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset primary solvent addition amount, the solvent stop valve is triggered to be closed, and the primary solvent addition operation is stopped;
when the auxiliary agent feeding module receives an instruction and starts to add auxiliary agents into the batching kettle, the auxiliary agent flowmeter starts to meter the addition amount of the auxiliary agents, and as the addition amount increases, the auxiliary agent regulating valve starts to work and reduces the opening of the valve when the addition amount reaches a set value, the added auxiliary agent amount is further accurately controlled, and when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent addition amount, the auxiliary agent stop valve is triggered to be closed, and the addition operation of the auxiliary agents is stopped; the auxiliary agent is a catalyst, a blocking agent and an iron removing agent which are added in the production process of the polycarbonate and are sequentially added according to the process requirements;
when the solvent secondary feeding module receives an instruction and starts to add secondary solvent into the batching kettle, the solvent flowmeter starts to meter the adding amount of the solvent, and as the adding amount increases, the solvent regulating valve starts to work and reduces the opening of the valve when reaching a set value, the adding amount of the solvent is further accurately controlled, and when the accumulated value of the solvent flowmeter is equal to or greater than the preset adding amount of the secondary solvent, the solvent stop valve is triggered to be closed, and the secondary adding operation of the solvent is stopped.
6. A method for producing polycarbonate precision batch based on an autonomous system for polycarbonate batch as defined in claim 1 or 2, comprising the steps of:
step 1: setting a start-stop signal; according to the formula of the polycarbonate production process, calculating the amount of bisphenol A, solvent added for the first time, solvent added for the second time and auxiliary agent needed to be added; setting start-stop signal values of accurate metering feeding equipment, a solvent storage tank and an auxiliary agent storage tank according to the required adding amount of different raw materials;
step 2: calibrating accurate metering and charging equipment; in the preparation stage of batching, a bisphenol A feeding module and a feeding module are started in sequence, so that bisphenol A materials are fully filled in accurate metering and feeding equipment, and when batching operation is started, the added bisphenol A materials are prevented from deviation or fluctuation caused by material shortage of a dead bin of a weightless feeder or a screw propeller of a combined feeder, and accurate feeding is realized;
step 3: adding the solvent once; calling a solvent primary feeding module according to a preset program to finish primary solvent feeding in the batching kettle; triggering the operation of adding the solvent once to stop when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent once adding amount;
step 4: bisphenol A is added; the bisphenol A feeding module is called to finish the quantitative feeding of bisphenol A; triggering the operation of adding bisphenol A to stop when the difference value of two times of weighing before and after the accurate metering and charging equipment is equal to or larger than the preset formula demand of bisphenol A;
step 5: adding an auxiliary agent; calling an auxiliary agent feeding module to finish the addition of the auxiliary agent; according to the process requirements, adding a catalyst, a blocking agent and an iron remover according to a preset program; triggering the operation of adding the auxiliary agent to stop when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent formula demand;
step 6: dissolving and stirring; starting a stirrer, and uniformly mixing the primary solvent, the bisphenol A and the auxiliary agent added into a batching kettle to finish preliminary batching after the bisphenol A is fully dissolved in the primary solvent and the auxiliary agent, so as to obtain a mixed solution; opening a discharging valve, and adding the mixed solution in the batching kettle into the reaction kettle;
step 7: adding the solvent for the second time; calling a solvent secondary feeding module to finish secondary feeding of the solvent in the batching kettle; triggering the operation of secondary solvent addition to stop when the accumulated value of the solvent flowmeter is equal to or greater than the preset secondary solvent addition amount;
step 8: flushing; starting stirring, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle, ensuring that no material loss is caused in the batching process, after the preset flushing time is reached, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle completely, opening a discharging valve, and adding a solvent added secondarily in the batching kettle and bisphenol A and auxiliary agents flushed from the kettle wall into a reaction kettle together to complete the batching operation of the polycarbonate.
7. A method for producing a polycarbonate precision batch based on an autonomous system for polycarbonate batch as defined in claim 3, comprising the steps of:
step 1: setting a start-stop signal; according to the formula of the polycarbonate production process, calculating the amount of bisphenol A, solvent added for the first time, solvent added for the second time and auxiliary agent needed to be added; setting start-stop signal values of accurate metering feeding equipment, a solvent storage tank and an auxiliary agent storage tank according to the required adding amount of different raw materials;
step 2: calibrating accurate metering and charging equipment; in the preparation stage of batching, a bisphenol A feeding module and a feeding module are started in sequence, so that bisphenol A materials are fully filled in accurate metering and feeding equipment, and when batching operation is started, the added bisphenol A materials are prevented from deviation or fluctuation caused by material shortage of a dead bin of a weightless feeder or a screw propeller of a combined feeder, and accurate feeding is realized;
step 3: adding the solvent once; calling a solvent primary feeding module according to a preset program to finish primary solvent feeding in the batching kettle; triggering the operation of adding the solvent once to stop when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent once adding amount;
step 4: bisphenol A is added; the bisphenol A feeding module is called to finish the quantitative feeding of bisphenol A; triggering the operation of adding bisphenol A to stop when the difference value of two times of weighing before and after the accurate metering and charging equipment is equal to or larger than the preset formula demand of bisphenol A;
step 5: adding an auxiliary agent; calling an auxiliary agent feeding module to finish the addition of the auxiliary agent; according to the process requirements, adding a catalyst, a blocking agent and an iron remover according to a preset program; triggering the operation of adding the auxiliary agent to stop when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent formula demand;
step 6: dissolving and stirring; starting a stirrer, and uniformly mixing the primary solvent, the bisphenol A and the auxiliary agent added into a batching kettle to finish preliminary batching after the bisphenol A is fully dissolved in the primary solvent and the auxiliary agent, so as to obtain a mixed solution; opening a discharging valve, and adding the mixed solution in the batching kettle into the reaction kettle;
step 7: adding the solvent for the second time; calling a solvent secondary feeding module to finish secondary feeding of the solvent in the batching kettle; triggering the operation of secondary solvent addition to stop when the accumulated value of the solvent flowmeter is equal to or greater than the preset secondary solvent addition amount;
step 8: flushing; starting stirring, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle, ensuring that no material loss is caused in the batching process, after the preset flushing time is reached, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle completely, opening a discharging valve, and adding a solvent added secondarily in the batching kettle and bisphenol A and auxiliary agents flushed from the kettle wall into a reaction kettle together to complete the batching operation of the polycarbonate.
8. A method for producing a polycarbonate precision batch based on an autonomous system for polycarbonate batch as defined in claim 4, comprising the steps of:
step 1: setting a start-stop signal; according to the formula of the polycarbonate production process, calculating the amount of bisphenol A, solvent added for the first time, solvent added for the second time and auxiliary agent needed to be added; setting start-stop signal values of accurate metering feeding equipment, a solvent storage tank and an auxiliary agent storage tank according to the required adding amount of different raw materials;
step 2: calibrating accurate metering and charging equipment; in the preparation stage of batching, a bisphenol A feeding module and a feeding module are started in sequence, so that bisphenol A materials are fully filled in accurate metering and feeding equipment, and when batching operation is started, the added bisphenol A materials are prevented from deviation or fluctuation caused by material shortage of a dead bin of a weightless feeder or a screw propeller of a combined feeder, and accurate feeding is realized;
step 3: adding the solvent once; calling a solvent primary feeding module according to a preset program to finish primary solvent feeding in the batching kettle; triggering the operation of adding the solvent once to stop when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent once adding amount;
step 4: bisphenol A is added; the bisphenol A feeding module is called to finish the quantitative feeding of bisphenol A; triggering the operation of adding bisphenol A to stop when the difference value of two times of weighing before and after the accurate metering and charging equipment is equal to or larger than the preset formula demand of bisphenol A;
step 5: adding an auxiliary agent; calling an auxiliary agent feeding module to finish the addition of the auxiliary agent; according to the process requirements, adding a catalyst, a blocking agent and an iron remover according to a preset program; triggering the operation of adding the auxiliary agent to stop when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent formula demand;
step 6: dissolving and stirring; starting a stirrer, and uniformly mixing the primary solvent, the bisphenol A and the auxiliary agent added into a batching kettle to finish preliminary batching after the bisphenol A is fully dissolved in the primary solvent and the auxiliary agent, so as to obtain a mixed solution; opening a discharging valve, and adding the mixed solution in the batching kettle into the reaction kettle;
step 7: adding the solvent for the second time; calling a solvent secondary feeding module to finish secondary feeding of the solvent in the batching kettle; triggering the operation of secondary solvent addition to stop when the accumulated value of the solvent flowmeter is equal to or greater than the preset secondary solvent addition amount;
step 8: flushing; starting stirring, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle, ensuring that no material loss is caused in the batching process, after the preset flushing time is reached, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle completely, opening a discharging valve, and adding a solvent added secondarily in the batching kettle and bisphenol A and auxiliary agents flushed from the kettle wall into a reaction kettle together to complete the batching operation of the polycarbonate.
9. A method for producing a polycarbonate precision batch based on an autonomous system for polycarbonate batch as defined in claim 5, comprising the steps of:
step 1: setting a start-stop signal; according to the formula of the polycarbonate production process, calculating the amount of bisphenol A, solvent added for the first time, solvent added for the second time and auxiliary agent needed to be added; setting start-stop signal values of accurate metering feeding equipment, a solvent storage tank and an auxiliary agent storage tank according to the required adding amount of different raw materials;
step 2: calibrating accurate metering and charging equipment; in the preparation stage of batching, a bisphenol A feeding module and a feeding module are started in sequence, so that bisphenol A materials are fully filled in accurate metering and feeding equipment, and when batching operation is started, the added bisphenol A materials are prevented from deviation or fluctuation caused by material shortage of a dead bin of a weightless feeder or a screw propeller of a combined feeder, and accurate feeding is realized;
step 3: adding the solvent once; calling a solvent primary feeding module according to a preset program to finish primary solvent feeding in the batching kettle; triggering the operation of adding the solvent once to stop when the accumulated value of the solvent flowmeter is equal to or larger than the preset solvent once adding amount;
step 4: bisphenol A is added; the bisphenol A feeding module is called to finish the quantitative feeding of bisphenol A; triggering the operation of adding bisphenol A to stop when the difference value of two times of weighing before and after the accurate metering and charging equipment is equal to or larger than the preset formula demand of bisphenol A;
step 5: adding an auxiliary agent; calling an auxiliary agent feeding module to finish the addition of the auxiliary agent; according to the process requirements, adding a catalyst, a blocking agent and an iron remover according to a preset program; triggering the operation of adding the auxiliary agent to stop when the accumulated value of the auxiliary agent flowmeter is equal to or greater than the preset auxiliary agent formula demand;
step 6: dissolving and stirring; starting a stirrer, and uniformly mixing the primary solvent, the bisphenol A and the auxiliary agent added into a batching kettle to finish preliminary batching after the bisphenol A is fully dissolved in the primary solvent and the auxiliary agent, so as to obtain a mixed solution; opening a discharging valve, and adding the mixed solution in the batching kettle into the reaction kettle;
step 7: adding the solvent for the second time; calling a solvent secondary feeding module to finish secondary feeding of the solvent in the batching kettle; triggering the operation of secondary solvent addition to stop when the accumulated value of the solvent flowmeter is equal to or greater than the preset secondary solvent addition amount;
step 8: flushing; starting stirring, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle, ensuring that no material loss is caused in the batching process, after the preset flushing time is reached, flushing bisphenol A and auxiliary agents adhered on the kettle wall of the batching kettle completely, opening a discharging valve, and adding a solvent added secondarily in the batching kettle and bisphenol A and auxiliary agents flushed from the kettle wall into a reaction kettle together to complete the batching operation of the polycarbonate.
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Citations (3)
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|---|---|---|---|---|
| EP0306838A2 (en) * | 1987-09-05 | 1989-03-15 | Idemitsu Petrochemical Co. Ltd. | Process of preparing polycarbonates |
| CN205023524U (en) * | 2015-09-01 | 2016-02-10 | 北京燕山粉研精机有限公司 | Continuous powder weigh feeder of high accuracy |
| CN108946204A (en) * | 2018-07-27 | 2018-12-07 | 珠海市盛西源机电设备有限公司 | A kind of DCS system that intelligent auxiliary agent adds automatically |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8426531B2 (en) * | 2009-03-24 | 2013-04-23 | Styron Europe Gmbh | Method for monitoring monomer concentration in interfacial polycarbonate manufacturing process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0306838A2 (en) * | 1987-09-05 | 1989-03-15 | Idemitsu Petrochemical Co. Ltd. | Process of preparing polycarbonates |
| CN205023524U (en) * | 2015-09-01 | 2016-02-10 | 北京燕山粉研精机有限公司 | Continuous powder weigh feeder of high accuracy |
| CN108946204A (en) * | 2018-07-27 | 2018-12-07 | 珠海市盛西源机电设备有限公司 | A kind of DCS system that intelligent auxiliary agent adds automatically |
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