CN207699497U - A kind of esterification system producing PBT - Google Patents
A kind of esterification system producing PBT Download PDFInfo
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- CN207699497U CN207699497U CN201721868417.5U CN201721868417U CN207699497U CN 207699497 U CN207699497 U CN 207699497U CN 201721868417 U CN201721868417 U CN 201721868417U CN 207699497 U CN207699497 U CN 207699497U
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Abstract
The utility model is related to a kind of esterification systems producing PBT, it includes esterification device and slurry configuration device, slurry configuration device includes slurry mixing kettle, PTA feed hoppers, esterification device includes reaction kettle of the esterification, Esterification separation tower, the esterification system for producing PBT further includes the BD adding sets being connected to respectively by third pipeline and the 4th pipeline with slurry mixing kettle and reaction kettle of the esterification, the esterification system of production PBT, it can ensure the automatic mixing of PTA and BD conveying capacities, it is using to be added the control mode that the amount of BD is added in the amount control of PTA, the dosage that i.e. control PTA and BD is put into slurry mixing kettle meets specified requirement.It makes full use of the heat of the water vapour of the high temperature generated in reaction kettle of the esterification, THF and part BD steam, to greatest extent and exempts from the waste of thermal energy, and reduce the power consumption of heating system, energy saving, improves enterprise efficiency.
Description
Technical field
The utility model is related to a kind of esterification systems producing PBT.
Background technology
Polybutylene terephthalate (PBT) (abbreviation PBT), has that high temperature resistant, moisture-proof, electrical insulation capability be good, oil resistant, resistance toization
The features such as burn into molding is fast is learned, and moderate, it is relatively low compared to Other Engineering plastics synthetic technology difficulty.PBT fibrous elasticities are excellent
Good, soft comfortable, easy coloring has many advantages, such as other synthetic fibers.It is mainly used for electronic apparatus, automobile and machinery
Equal fields.PBT also can be used as fiber applications in fields such as weavings.PBT is various in style, in addition to the common grade of enhancing, also hinders
Combustion type, fiberglass reinforced type, fiberglass reinforced fire retardant type, blend alloy grade etc., using very extensive.
Currently, dividing from raw material use, there are two types of processing technology routine schemes, i.e. direct esterification and ester to hand over for PBT resin
Method is changed, the water and THF that wherein direct esterification generates are easily isolated, and the THF of remanufacture can reach the purity that business uses,
Economic value added is high, and effect on environment is small, and this method is widely used, and direct esterification is using PTA and BD（Butanediol）Make
For raw material, the steps necessary that mixed configuration is PBT productions is carried out to PTA and BD.The mixed configuration device of PTA and BD usually wraps
It includes slurry mixing kettle and puts into the feed hopper of PTA into the mixing kettle, which is further opened with the feed inlet of addition BD, PTA
With the proportioning of the input amount of BD（Molar ratio）It is related to the quality of final PBT products, the additive amount of PTA passes through in the prior art
PTA feed hoppers control, and the addition of BD is controlled by BD adding sets, although the two is added according to blas, both for
Individually control, it is difficult to ensure that the stabilization of the molar ratio of the two addition, causes the quality of PBT products that can not carry out effectively stablizing control
System, product quality is neglected suddenly poor.
In addition, after the completion of slurry mixed preparing, slurry can be driven into esterification device, and height in the reactor
Temperature is constantly passed through that esterification under conditions of fresh BD generates BHBT and water, monomer BHBT further polymerize under high vacuum condition
PBT is generated, while deviating from BD；The internal temperature of the usual esterifier can reach 240 °, react generation water vapour,
The top of THF and part BD steam autoreactors, which enters, carries out separating treatment in process tower.In the prior art, esterifier ester
Water vapour, THF and the part BD steam of the high temperature generated in change are introduced directly into knockout tower and do separating treatment, water vapour, THF and portion
The thermal energy of BD steam is divided not made full use of to it, and ester is added after usually requiring the heat exchange by heating system in fresh BD
Change in reactor, there are heavy workload, the outstanding problems such as power consumption height for heating system.
Invention content
Technical problem to be solved in the utility model is to overcome the deficiencies of the prior art and provide a kind of improved production
The esterification system of PBT.
In order to solve the above technical problems, the technical solution that the utility model is taken is as follows：
A kind of esterification system producing PBT comprising esterification device and provide material for esterification device
Slurry configuration device, slurry configuration device include slurry mixing kettle, are fed by the PTA that first pipe is connected to slurry mixing kettle
Bucket, esterification device includes reaction kettle of the esterification, the Esterification separation tower that is connected to by second pipe with reaction kettle of the esterification, and slurry mixes
Close kettle be connected to reaction kettle of the esterification by feeding pipeline, the esterification system for producing PBT further include respectively with slurry mixing kettle and ester
Change the BD adding sets that reaction kettle is connected to by third pipeline and the 4th pipeline, the bottom of PTA feed hoppers is equipped with for conveying PTA
Screw thread conveyer, the outlet of screw thread conveyer is communicated with first pipe and first pipe is equipped with the of monitoring PTA conveying capacities
One monitoring device, third pipeline are equipped with the pump of conveying BD and monitor the second monitoring device of BD conveying capacities, slurry configuration device
Further include the control system being connect respectively with screw thread conveyer and pump and the first monitoring device and the second monitoring device signal, control
System processed receive the monitoring information of the first monitoring device and the second monitoring device and according to monitoring information control screw thread conveyer and
Pump conveys the conveying capacity of PTA and BD respectively；It is provided on second pipe and passes hot linked first heat energy exchange system with it, the 4th
Pipeline passes through the first heat energy exchange system to be arranged and conduct heat with the first heat energy exchange system and connects.
Preferably, first pipe is the rigid conduit vertically extended, and the upper end of rigid first pipe is equipped with
The lower end of first monitoring device, rigid first pipe is connected to slurry mixing kettle, and the first monitoring device is weighing device, spiral shell
The import of line conveyer is connected to PTA feed hoppers, and the outlet of screw thread conveyer is communicated with the import of weighing device；When defeated through screw thread
When sending the exit of device to be transported to the PTA weight of weighing device to be more than or less than setting value, weight that weighing device will be surveyed
Information is sent to control system, and control system controls screw thread conveyer and increases conveying capacity or reduction conveying capacity.
Preferably, weighing device include into material shell and weighing apparatus, the import of weighing device be into the opening above material shell, into
The tilt prop diagonally extended is provided on the inside of material shell, upper end and the charging shell phase of tilt prop connect, the lower end of tilt prop
It is formed with interval with the shell into material shell, PTA leads to the outlet of weighing device behind interval.When PTA is by into opening above material shell
Mouth enters into material shell, and weighing apparatus measures PTA weight and is sent to control system after PTA drops down onto tilt prop, after PTA drops down onto tilt prop
The outlet that interval leads to weighing device is formed from the lower end of tilt prop and shell.
Preferably, the second monitoring device includes the flowmeter being connect with control system signal being set on third pipeline, stream
Gauge is located at the downstream position of pump；When the PTA weight that the exit through screw thread conveyer is transported to weighing device is more than or less than
Setting value, control system receive the weight information that weighing device measures, and while control system control screw thread conveyer conveying,
The demand of BD is calculated according to weight information and demand is compared with the BD flow informations that flow measurement obtains, and root
Pump, which is controlled, according to comparison information increases or reduce BD conveying capacities.
Preferably, the side of the close BD adding sets of the 4th pipeline passes through the first heat energy exchange system, the first thermal energy to hand over
The system of changing includes the multigroup first heat exchanger being spaced successively, and every group of first heat exchanger is equipped with manages for second pipe and the 4th
The interchange channel that road is worn.
Preferably, esterification device further includes the second heat energy exchange system with external heating system connectivity, the second heat
Energy exchange system includes second heat exchanger, and the side of the close reaction kettle of the esterification of the 4th pipeline is equipped with parallel with one another first
Pipe and the second branch pipe, the first branch pipe pass through second heat exchanger to be arranged and conduct heat with second heat exchanger and connect；First branch pipe and
The junction that second branch pipe is located at the upstream of second heat exchanger is provided with the first valve.When temperature inductor monitors the 4th pipe
BD in road is higher than setting value, then is not necessarily to be heated by second heat exchanger, therefore can be by the first valve by the
One branch pipe is closed, and the second branch pipe is opened, and BD can be directly passed through in reaction kettle of the esterification from the second branch pipe, if temperature sense
It answers device to monitor that the BD in the 4th pipeline is less than setting value, then needs to heat the BD in the 4th pipeline, with meet demand,
At this moment just the first branch pipe is opened, and the second branch pipe is closed.
Preferably, esterification device further include be set on the 4th pipeline be located at the first valve downstream for monitoring the
The temperature inductor of four pipe temperatures, connect respectively with temperature inductor and the first valve signal for according to temperature inductor
The temperature information of monitoring controls the controller that the first valve connects the first branch pipe or the second branch pipe；When temperature inductor monitors
When the temperature of the upstream end positioned at the first valve of four pipelines is higher than setting value, the first temperature signal is sent out to controller, control
Device controls the first valve and connects the second branch pipe；When temperature inductor monitors the upstream end positioned at the first valve of the 4th pipeline
Temperature when being less than setting value, send out second temperature signal to controller, controller controls the first valve and connects the first branch pipe.
Preferably, BD is offered at the top of reaction kettle of the esterification and adds spare mouth, BD add spare mouth by backup line with
4th pipeline is connected to, and the junction of the 4th pipeline and backup line is provided with the second valve, esterification device further include with outside
The third heat energy exchange system of portion's heating system connection, third heat energy exchange system includes third heat exchanger, and backup line is worn
It crosses the setting of third heat exchanger and conducts heat with third heat exchanger and connect.Pass through the backup line and third thermal energy exchange of BD additions
The setting of system can pass through second in the first heat energy exchange system and the second heat energy exchange system failure on the 4th pipeline
Valve disconnects the connection of second pipe, and makes BD from being added after third heat exchanger in backup line.
Due to the implementation of above technical scheme, the utility model has the following advantages that compared with prior art：This practicality is new
The slurry configuration device of the esterification system of the production PBT of type passes through screw thread conveyer, pump and the first monitoring device and the second prison
Survey the setting of device and control system so that control system can be according to the synthesis of the first monitoring device and the second monitoring device
Detection information controls the conveying capacity in first pipe and third pipeline of PTA and BD, that is, passes through the adjusting of ratio.Guarantee can
The automatic mixing of PTA and BD conveying capacities is controlled using the control mode that the amount of BD is added in the amount control of PTA is added
The dosage that PTA and BD processed are put into slurry mixing kettle meets specified requirement.
In addition, the esterification device of the esterification system of the production PBT of the utility model installs three groups additional on second pipe
First thermal energy converter）, and the 4th pipeline for adding BD is passed through from three groups of first heat exchangers, so as to smoothly
The high temperature of second pipe is utilized（Three groups can to greatest extent be transferred to the temperature of second pipe on heat exchanger,
And temperature is passed into the BD in the 4th pipeline to greatest extent, when the heat of the first heat energy exchange system is insufficient, can pass through
Second heat energy exchange system is heated again, needs temperature to reach.It makes full use of the high temperature generated in reaction kettle of the esterification
Water vapour, THF and part BD steam heat, to greatest extent and exempt from the waste of thermal energy, and reduce the electricity of heating system
It can consume, it is energy saving, improve the performance of enterprises.
Description of the drawings
Fig. 1 is the overall structure diagram of the esterification system of the production PBT of the utility model；
Wherein：1, slurry mixing kettle；11, it pumps；12, flowmeter；2, PTA feed hoppers；21, screw thread conveyer；22, it weighs dress
It sets；221, into material shell；222, tilt prop；223, weighing apparatus；3, reaction kettle of the esterification；31, the first branch pipe；32, the second branch pipe；33、
First valve；34, temperature inductor；35, controller；4, Esterification separation tower；40, first heat exchanger；5, BD adding sets；
50, the second valve；51, backup line；52, second heat exchanger；53, third heat exchanger；6, heating system；G1, the first pipe
Road；G2, second pipe；G3, third pipeline；G4, the 4th pipeline.
Specific implementation mode
The utility model is described in more detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of esterification system producing PBT comprising esterification device and be esterification device
The slurry configuration device of material is provided, slurry configuration device includes slurry mixing kettle 1, passes through first pipe with slurry mixing kettle 1
The PTA feed hoppers 2 of G1 connections, esterification device include reaction kettle of the esterification 3, are connected by second pipe G2 with reaction kettle of the esterification 3
Logical Esterification separation tower 4, slurry mixing kettle 1 are connected to by feeding pipeline with reaction kettle of the esterification 3, produce the esterification system of PBT also
Including the BD adding sets being connected to respectively by third pipeline G3 and the 4th pipeline G4 with slurry mixing kettle 1 and reaction kettle of the esterification 3
The bottom of 5, PTA feed hoppers 2 is equipped with the screw thread conveyer 21 for conveying PTA, the outlet of screw thread conveyer 21 and first pipe
G1 is communicated and first pipe G1 is equipped with the first monitoring device of monitoring PTA conveying capacities, and third pipeline G3 is equipped with conveying BD's
Pump 11 and monitoring BD conveying capacities the second monitoring device, slurry configuration device further include respectively with screw thread conveyer 21 and pump 11 with
And first control system that is connected with the second monitoring device signal of monitoring device, control system receive the first monitoring device and second
The monitoring information of monitoring device simultaneously controls the conveying that screw thread conveyer 21 and pump 11 convey PTA and BD respectively according to monitoring information
Amount；It is provided on second pipe G2 and passes hot linked first heat energy exchange system with it, the 4th pipeline G4 is handed over across the first thermal energy
It changes system setting and conducts heat with the first heat energy exchange system and connect.
In this example, first pipe G1 is the rigid conduit vertically extended, the upper end of rigid first pipe G1
Equipped with the first monitoring device, the lower end of rigid first pipe G1 is connected to slurry mixing kettle 1, and the first monitoring device is to weigh
The import of device 22, screw thread conveyer 21 is connected to PTA feed hoppers 2, the outlet of screw thread conveyer 21 and weighing device 22 into
Mouth communicates；When the PTA weight that the exit through screw thread conveyer 21 is transported to weighing device 22 is more than or less than setting value, claim
Refitting sets 22 and the weight information surveyed is sent to control system, control system control screw thread conveyer 21 increase conveying capacity or
Person's reduction conveying capacity.Weighing device 22 includes into material shell 221 and weighing apparatus 223, and the import of weighing device 22 is into material shell 221
The opening of top is provided with the tilt prop 222 diagonally extended, the upper end of tilt prop 222 and charging into the inside of material shell 221
Shell 221 connects, and the lower end of tilt prop 222 is formed with interval with the shell into material shell 221, and PTA leads to dress of weighing behind interval
Set 22 outlet.When PTA is entered by the opening into 221 top of material shell into material shell 221, PTA drops down onto weighing apparatus after tilt prop 222
223 measure PTA weight and are sent to control system, and PTA is dropped down onto after tilt prop 222 from the lower end of tilt prop 222 and shell shape
The outlet of weighing device 22 is led at place at interval.Second monitoring device include be set to third pipeline G3 on control system signal
The flowmeter 12 of connection, flowmeter 12 are located at the downstream position of pump 11；It weighs when the exit through screw thread conveyer 21 is transported to
The PTA weight of device 22 is more than or less than setting value, and control system receives the weight information that weighing device 22 measures, and controls system
While system control screw thread conveyer 21 conveys, the demand of BD is calculated according to weight information and by demand and flowmeter
The 12 BD flow informations measured are compared, and increase or reduce BD conveying capacities according to comparison information control pump 11.
Further, the side of the close BD adding sets 5 of the 4th pipeline G4 passes through the first heat energy exchange system, the first heat
Energy exchange system includes the multigroup first heat exchanger 40 being spaced successively, and every group of first heat exchanger 40 is equipped with for second pipe
The interchange channel that G2 and the 4th pipeline G4 are worn.Esterification device further includes the second thermal energy being connected to external heating system 6
Exchange system, the second heat energy exchange system include second heat exchanger 52, the side of the close reaction kettle of the esterification 3 of the 4th pipeline G4
Equipped with the first branch pipe 31 and the second branch pipe 32 parallel with one another, the first branch pipe 31 passes through second heat exchanger 52 to be arranged and with second
The heat transfer connection of heat exchanger 52；First branch pipe 31 and the second branch pipe 32 are located at the junction setting of the upstream of second heat exchanger 52
There is the first valve 33.When temperature inductor 34 monitors the BD in the 4th pipeline G4 higher than setting value, then without passing through second
Heat exchanger 52 is heated, therefore can be closed the first branch pipe 31 by the first valve 33, and the second branch pipe 32 is opened,
BD can be directly passed through from the second branch pipe 32 in reaction kettle of the esterification 3, if temperature inductor 34 monitors in the 4th pipeline G4
BD be less than setting value, then need to heat the BD in the 4th pipeline G4, with meet demand, at this moment just by the first branch pipe 31
It opens, and the second branch pipe 32 is closed.Esterification device further includes being set to being located on the first valve 33 on the 4th pipeline G4
Trip for monitor the 4th pipeline G4 temperature temperature inductor 34, respectively with temperature inductor 34 and 33 signal of the first valve company
The temperature information for being monitored according to temperature inductor 34 connect controls the first valve 33 and connects the first branch pipe 31 or the second branch pipe
32 controller 35；When temperature inductor 34 monitors that the temperature of the upstream end positioned at the first valve 33 of the 4th pipeline G4 is higher than
When setting value, the first temperature signal is sent out to controller 35, controller 35 controls the first valve 33 and connects the second branch pipe 32；When
When temperature inductor 34 monitors that the temperature of the upstream end positioned at the first valve 33 of the 4th pipeline G4 is less than setting value, the is sent out
Two temperature signals to controller 35, controller 35 controls the first valve 33 and connects the first branch pipe 31.The top of reaction kettle of the esterification 3
It offers BD and adds spare mouth, BD adds spare mouth and is connected to the 4th pipeline G4 by backup line 51, the 4th pipeline G4 and standby
The junction of pipeline 51 is provided with the second valve 50, esterification device further includes the third being connected to external heating system 6
Heat energy exchange system, third heat energy exchange system include third heat exchanger 53, and backup line 51 passes through third heat exchanger 53
It is arranged and conducts heat with third heat exchanger 53 and connects.Pass through the backup line 51 of BD additions and setting for third heat energy exchange system
It sets, in the first heat energy exchange system and the second heat energy exchange system failure on the 4th pipeline G4, the second valve 50 can be passed through
The connection of second pipe G2 is disconnected, and makes BD from being added after third heat exchanger 53 in backup line 51.
In conclusion the slurry configuration device of the esterification system of the production PBT of the utility model passes through screw thread conveyer, pump
And first monitoring device and the second monitoring device and control system setting so that control system can according to first monitoring
The comprehensive detection information of device and the second monitoring device controls the conveying capacity in first pipe and third pipeline of PTA and BD,
Pass through the adjusting of ratio.Ensure can PTA and BD conveying capacities automatic mixing, using be added PTA amount control plus
Enter the control mode of the amount of BD, that is, controls the dosage that PTA and BD is put into slurry mixing kettle and meet specified requirement.
In addition, the esterification device of the esterification system of the production PBT of the utility model installs three groups additional on second pipe
First thermal energy converter）, and the 4th pipeline for adding BD is passed through from three groups of first heat exchangers, so as to smoothly
The high temperature of second pipe is utilized（Three groups can to greatest extent be transferred to the temperature of second pipe on heat exchanger,
And temperature is passed into the BD in the 4th pipeline to greatest extent, when the heat of the first heat energy exchange system is insufficient, can pass through
Second heat energy exchange system is heated again, needs temperature to reach.It makes full use of the high temperature generated in reaction kettle of the esterification
Water vapour, THF and part BD steam heat, to greatest extent and exempt from the waste of thermal energy, and reduce the electricity of heating system
It can consume, it is energy saving, improve the performance of enterprises.
The utility model is described in detail above, its object is to allow the personage for being familiar with this field technology can be much of that
It solves the content of the utility model and is implemented, the scope of protection of the utility model can not be limited with this, it is all according to this practicality
Equivalent change or modification made by novel Spirit Essence should all cover within the protection scope of the present utility model.
Claims (8)
1. a kind of esterification system producing PBT comprising esterification device and provide material for the esterification device
Slurry configuration device, the slurry configuration device includes slurry mixing kettle, connected by first pipe with the slurry mixing kettle
Logical PTA feed hoppers, the esterification device include reaction kettle of the esterification, are connected to by second pipe with the reaction kettle of the esterification
Esterification separation tower, the slurry mixing kettle is connected to by feeding pipeline with the reaction kettle of the esterification, the esterification of the production PBT
System further includes being added respectively by the BD that third pipeline and the 4th pipeline are connected to the slurry mixing kettle and reaction kettle of the esterification
Device, it is characterised in that：
The bottom of the PTA feed hoppers is equipped with screw thread conveyer for conveying PTA, the outlet of the screw thread conveyer with it is described
First pipe communicates and the first pipe is equipped with the first monitoring device of monitoring PTA conveying capacities, is set on the third pipeline
Have conveying BD pump and monitor BD conveying capacities the second monitoring device, the slurry configuration device further include respectively with the screw thread
The control system that conveyer is connected with pump and first monitoring device with the second monitoring device signal, the control system connect
Receive the monitoring information of first monitoring device and the second monitoring device and according to monitoring information control the screw thread conveyer and
Pump conveys the conveying capacity of the PTA and BD respectively；It is provided on the second pipe and passes hot linked first thermal energy exchange with it
System, the 4th pipeline pass through first heat energy exchange system to be arranged and connect with first heat energy exchange system heat transfer
It connects.
2. the esterification system of production PBT according to claim 1, it is characterised in that：The first pipe is vertically square
To the rigid conduit of extension, the upper end of the rigid first pipe is equipped with first monitoring device, and rigid described the
The lower end of one pipeline is connected to the slurry mixing kettle, and first monitoring device is weighing device, the screw thread conveyer
Import be connected to the PTA feed hoppers, the outlet of the screw thread conveyer is communicated with the import of the weighing device；When through institute
State screw thread conveyer exit be transported to the weighing device PTA weight be more than or less than setting value when, the dress of weighing
Set the weight information that will be surveyed and be sent to control system, the control system control the screw thread conveyer increase conveying capacity or
Person reduces conveying capacity.
3. the esterification system of production PBT according to claim 2, it is characterised in that：The weighing device includes into material shell
And weighing apparatus, the import of the weighing device are described into the opening above material shell, it is described into being provided with along oblique on the inside of material shell
To the tilt prop of extension, the upper end of the tilt prop connects with the charging shell phase, the lower end of the tilt prop with it is described into
The shell of material shell is formed with interval, and the PTA leads to the outlet of the weighing device behind the interval.
4. the esterification system of production PBT according to claim 3, it is characterised in that：Second monitoring device includes setting
In the flowmeter being connect with the control system signal on the third pipeline, the flowmeter is located at the downstream bits of the pump
It sets；When the exit through the screw thread conveyer be transported to the weighing device PTA weight be more than or less than setting value, it is described
Control system receives the weight information that the weighing device measures, and the control system controls the screw thread conveyer conveying
Meanwhile the BD flow informations progress that the demand of BD is calculated according to weight information and obtains demand and the flow measurement
It compares, and the pump is controlled according to comparison information and increases or reduce BD conveying capacities.
5. the esterification system of production PBT according to claim 1, it is characterised in that：4th pipeline close to described
The side of BD adding sets pass through first heat energy exchange system, first heat energy exchange system include be spaced successively it is more
Group first heat exchanger, it is logical that first heat exchanger described in every group is equipped with the exchange worn for the second pipe and the 4th pipeline
Road.
6. the esterification system of production PBT according to claim 5, it is characterised in that：The esterification device further includes
With the second heat energy exchange system of external heating system connectivity, second heat energy exchange system includes second heat exchanger, institute
State the 4th pipeline close to the reaction kettle of the esterification side be equipped with the first branch pipe and the second branch pipe parallel with one another, described first
Branch pipe passes through the second heat exchanger to be arranged and conduct heat with the second heat exchanger and connects；First branch pipe and second
Pipe is provided with the first valve positioned at the junction of the upstream of the second heat exchanger.
7. the esterification system of production PBT according to claim 6, it is characterised in that：The esterification device further includes
The temperature sense for monitoring the 4th pipe temperature for being located at first valve downstream on the 4th pipeline
Device, the temperature information control for being monitored according to temperature inductor being connect respectively with the temperature inductor and the first valve signal
Make the controller that first valve connects first branch pipe or the second branch pipe；When the temperature inductor monitors described
When the temperature of the upstream end positioned at first valve of four pipelines is higher than setting value, the first temperature signal is sent out to the control
Device, the controller control first valve and connect second branch pipe；When the temperature inductor monitors described
When the temperature of the upstream end positioned at first valve of four pipelines is less than setting value, second temperature signal is sent out to the control
Device, the controller control first valve and connect first branch pipe.
8. the esterification system of production PBT according to claim 1, it is characterised in that：It is opened at the top of the reaction kettle of the esterification
Spare mouth is added equipped with BD, the BD adds spare mouth and is connected to the 4th pipeline by backup line, the 4th pipeline
The junction of backup line is provided with the second valve, the esterification device further includes with external heating system connectivity
Three heat energy exchange systems, the third heat energy exchange system include third heat exchanger, and the backup line passes through the third
Heat exchanger, which is arranged and conducts heat with the third heat exchanger, to be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721868417.5U CN207699497U (en) | 2017-12-27 | 2017-12-27 | A kind of esterification system producing PBT |
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| CN201721868417.5U CN207699497U (en) | 2017-12-27 | 2017-12-27 | A kind of esterification system producing PBT |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023066269A1 (en) * | 2021-10-19 | 2023-04-27 | 山东联欣环保科技有限公司 | Method for mixed feeding of phthalic anhydride and propylene oxide, equipment, and application |
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2017
- 2017-12-27 CN CN201721868417.5U patent/CN207699497U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023066269A1 (en) * | 2021-10-19 | 2023-04-27 | 山东联欣环保科技有限公司 | Method for mixed feeding of phthalic anhydride and propylene oxide, equipment, and application |
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