CN113943385A - PVB production process based on plate heat exchanger cooling - Google Patents
PVB production process based on plate heat exchanger cooling Download PDFInfo
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- CN113943385A CN113943385A CN202111376166.XA CN202111376166A CN113943385A CN 113943385 A CN113943385 A CN 113943385A CN 202111376166 A CN202111376166 A CN 202111376166A CN 113943385 A CN113943385 A CN 113943385A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/28—Condensation with aldehydes or ketones
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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Abstract
The invention discloses a PVB production process based on plate heat exchanger cooling, wherein a dissolved solvent is connected with a hollow pipe through a guide pipe, an air pump arranged on the surface of the hollow pipe is started to convey the solvent into the hollow pipe, when cooling is needed, the plate heat exchanger is started, heat exchange is carried out through a half piece through a thin rectangular channel formed between various plate pieces through the working principle of the plate heat exchanger, the generated low temperature can be diffused into the hollow pipe sleeved on the surface of a cold pipe and a hot pipe, the heated solvent is subjected to cold and hot exchange through the low temperature to finish the cooling effect, and impurities in the solvent are taken out through filtering by a filter screen arranged at a discharge port of the hollow pipe. This PVB producer based on plate heat exchanger cooling has solved the cooling tower cooling method and has leaded to the process cycle than longer, can not quick cool off, can not improve production cycle and production efficiency's problem.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a PVB production process based on plate heat exchanger cooling.
Background
PVB is dissolved in methanol, n-propanol, isopropanol, n-pentanol, benzyl alcohol, butanol, diacetone alcohol, propylene glycol ethyl ether/methyl ether/propyl ether, acetone, methyl ethyl ketone, cyclohexanone, dichloromethane, chloroform, methyl acetate, ethyl acetate, butyl acetate, acetic acid, etc. Has excellent flexibility and flexibility.
The PVB production process is subjected to spray cooling through a cooling tower through a traditional cooling device, and although the mode can achieve the cooling effect, granular PVB and water need to be separated after cooling, so that the process period is long, cooling cannot be performed quickly, and the production period and the production efficiency cannot be improved.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a PVB production process based on plate heat exchanger cooling, and solves the problems that the process period is long, the cooling cannot be carried out quickly, and the production period and the production efficiency cannot be improved due to a cooling tower cooling mode.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a PVB production process based on plate heat exchanger cooling specifically comprises the following steps:
s1, preparing materials, namely pure water, butyraldehyde, a plate heat exchanger, a pre-reactor, a centrifugal dryer, a storage tank, a catalyst, a trimming machine and a winding machine;
s2, adding polyvinyl alcohol generated by the bloom of the PVB resin into emulsified butyraldehyde, modifying the PVA by using a small amount of hydrochloric acid as a catalyst to obtain the PVB resin and byproduct water, and precipitating the PVB resin in the water;
s3, arranging a plate heat exchanger, sleeving a layer of hollow pipeline on a cold and hot pipe on the surface of the plate heat exchanger, arranging an air pump at the pipeline, and arranging a filter screen at the outlet of the hollow pipe;
s4, heating and dissolving, wherein in the dissolving process, pure water is used as a solvent, the solvent is heated by a heating system of the extruder, the heat energy of the heating system can be dissipated into the inner cavity of the extruder, the conveyed solvent is heated by the generated heat energy, and a raw material PVA is input in the heating process to be fully dissolved;
s5, cooling and forming, connecting the dissolved solvent with a hollow pipe through a conduit, starting an air pump arranged on the surface of the hollow pipe to convey the solvent into the hollow pipe, starting a plate heat exchanger when cooling is needed, performing heat exchange through a half plate through a thin rectangular channel formed between various plate sheets through the working principle of the plate heat exchanger, radiating the generated low temperature in the hollow pipe sleeved on the surface of a cold and hot pipe, performing cold and heat exchange on the heated solvent through the low temperature to finish the cooling effect, filtering through a filter screen arranged at a discharge port of the hollow pipe, taking out impurities in the solvent, and collecting the filtered solvent through a storage tank;
s6, adding an emulsifier, pouring the cooled PVA solution into a bloom device, slowly injecting a small amount of the emulsifier, and performing bloom by using butyraldehyde on a specific blade at a set speed;
s7, adding a catalyst, adding a bloom material into the catalyst, forming a uniform part in a pre-reactor, performing prepolymerization, and synthesizing a polymer PVB through condensation;
and S8, collecting finished products, washing granular PVB particles by water, drying by a centrifugal drier after washing, obtaining a PVB product, cutting edges of the PVB product by an edge cutter, and winding by a winding machine after cutting edges.
Further, the precipitation time in the step of S2 is 10-20 min.
Further, the mesh of the filter screen in the step S3 is 10-20 um.
Further, the heating temperature in the step S4 is 60 to 95 degrees.
Further, the cooling temperature in the step S5 is 5 to 10 degrees.
Further, the speed of the blade in the step S6 is 10-20 r/S.
Further, the time of the pre-reactor in the step S7 is 10-20 min.
Further, the time of the centrifugal dryer in the step S8 is 5-10 min.
(III) advantageous effects
The invention provides a PVB production process based on plate heat exchanger cooling. Compared with the prior art, the method has the following beneficial effects:
1. this PVB production technology based on plate heat exchanger cooling, solvent through after dissolving passes through the pipe connection hollow tube, and start the air pump that the hollow tube surface set up and carry the hollow tube with the solvent in, cool off as needs, start plate heat exchanger, theory of operation through plate heat exchanger, through the thin rectangle passageway that forms between various slab, carry out heat exchange through half, the low temperature of its production can distribute in the hollow tube that cold and hot pipe surface cup jointed, and come to carry out cold and hot exchange to the solvent of heating through low temperature, accomplish refrigerated effect, rapid cooling through plate heat exchanger, the effectual production cycle that shortens, PVB productivity and production effect are improved, and reduce this cost that traditional cooling device produced, accomplish this production of low-yield.
2. Dissolve this PVB production technology based on plate heat exchanger cooling, filter through the filter screen that the hollow tube discharge gate set up, take out the impurity that has in the solvent to the solvent after will filtering is collected through the holding vessel, accomplishes getting rid of impurity in the PVB, improves PVB's quality.
Drawings
FIG. 1 is a production flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to FIG. 1, example 1
The invention provides a technical scheme that: a PVB production process based on plate heat exchanger cooling specifically comprises the following steps:
s1, preparing materials, namely pure water, butyraldehyde, a plate heat exchanger, a pre-reactor, a centrifugal dryer, a storage tank, a catalyst, a trimming machine and a winding machine;
s2, adding polyvinyl alcohol generated by the bloom of the PVB resin into emulsified butyraldehyde, modifying the PVA by using a small amount of hydrochloric acid as a catalyst to obtain the PVB resin and byproduct water, and precipitating the PVB resin in the water;
s3, arranging a plate heat exchanger, sleeving a layer of hollow pipeline on a cold and hot pipe on the surface of the plate heat exchanger, arranging an air pump at the pipeline, and arranging a filter screen at the outlet of the hollow pipe;
s4, heating and dissolving, wherein in the dissolving process, pure water is used as a solvent, the solvent is heated by a heating system of the extruder, the heat energy of the heating system can be dissipated into the inner cavity of the extruder, the conveyed solvent is heated by the generated heat energy, and a raw material PVA is input in the heating process to be fully dissolved;
s5, cooling and forming, connecting the dissolved solvent with a hollow pipe through a conduit, starting an air pump arranged on the surface of the hollow pipe to convey the solvent into the hollow pipe, starting a plate heat exchanger when cooling is needed, performing heat exchange through a half plate through a thin rectangular channel formed between various plate sheets through the working principle of the plate heat exchanger, radiating the generated low temperature in the hollow pipe sleeved on the surface of a cold and hot pipe, performing cold and heat exchange on the heated solvent through the low temperature to finish the cooling effect, filtering through a filter screen arranged at a discharge port of the hollow pipe, taking out impurities in the solvent, and collecting the filtered solvent through a storage tank;
s6, adding an emulsifier, pouring the cooled PVA solution into a bloom device, slowly injecting a small amount of the emulsifier, and performing bloom by using butyraldehyde on a specific blade at a set speed;
s7, adding a catalyst, adding a bloom material into the catalyst, forming a uniform part in a pre-reactor, performing prepolymerization, and synthesizing a polymer PVB through condensation;
and S8, collecting finished products, washing granular PVB particles by water, drying by a centrifugal drier after washing, obtaining a PVB product, cutting edges of the PVB product by an edge cutter, and winding by a winding machine after cutting edges.
Further, the precipitation time in the step of S2 was 10 min.
Further, the mesh of the filter net in the step S3 is 10 um.
Further, the temperature heated in the step S4 is 60 degrees.
Further, the temperature of cooling in the step S5 is 5 degrees.
Further, the speed of the blade in the step of S6 is 10 rpm.
Further, the pre-reactor time in the step S7 was 10 min.
Further, the time for the centrifugal dryer in the step S8 was 5 min.
Example 2
The invention provides a technical scheme that: a PVB production process based on plate heat exchanger cooling specifically comprises the following steps:
s1, preparing materials, namely pure water, butyraldehyde, a plate heat exchanger, a pre-reactor, a centrifugal dryer, a storage tank, a catalyst, a trimming machine and a winding machine;
s2, adding polyvinyl alcohol generated by the bloom of the PVB resin into emulsified butyraldehyde, modifying the PVA by using a small amount of hydrochloric acid as a catalyst to obtain the PVB resin and byproduct water, and precipitating the PVB resin in the water;
s3, arranging a plate heat exchanger, sleeving a layer of hollow pipeline on a cold and hot pipe on the surface of the plate heat exchanger, arranging an air pump at the pipeline, and arranging a filter screen at the outlet of the hollow pipe;
s4, heating and dissolving, wherein in the dissolving process, pure water is used as a solvent, the solvent is heated by a heating system of the extruder, the heat energy of the heating system can be dissipated into the inner cavity of the extruder, the conveyed solvent is heated by the generated heat energy, and a raw material PVA is input in the heating process to be fully dissolved;
s5, cooling and forming, connecting the dissolved solvent with a hollow pipe through a conduit, starting an air pump arranged on the surface of the hollow pipe to convey the solvent into the hollow pipe, starting a plate heat exchanger when cooling is needed, performing heat exchange through a half plate through a thin rectangular channel formed between various plate sheets through the working principle of the plate heat exchanger, radiating the generated low temperature in the hollow pipe sleeved on the surface of a cold and hot pipe, performing cold and heat exchange on the heated solvent through the low temperature to finish the cooling effect, filtering through a filter screen arranged at a discharge port of the hollow pipe, taking out impurities in the solvent, and collecting the filtered solvent through a storage tank;
s6, adding an emulsifier, pouring the cooled PVA solution into a bloom device, slowly injecting a small amount of the emulsifier, and performing bloom by using butyraldehyde on a specific blade at a set speed;
s7, adding a catalyst, adding a bloom material into the catalyst, forming a uniform part in a pre-reactor, performing prepolymerization, and synthesizing a polymer PVB through condensation;
and S8, collecting finished products, washing granular PVB particles by water, drying by a centrifugal drier after washing, obtaining a PVB product, cutting edges of the PVB product by an edge cutter, and winding by a winding machine after cutting edges.
Further, the precipitation time in the step of S2 was 15 min.
Further, the mesh of the filter net in the step S3 is 15 um.
Further, the temperature heated in the step S4 is 80 degrees.
Further, the temperature of cooling in the step S5 was 7.5 degrees.
Further, the speed of the blade in the step of S6 is 15 rpm.
Further, the pre-reactor time in the step S7 was 15 min.
Further, the time of the centrifugal dryer in the step S8 was 7.5min
Example 3
The invention provides a technical scheme that: a PVB production process based on plate heat exchanger cooling specifically comprises the following steps:
s1, preparing materials, namely pure water, butyraldehyde, a plate heat exchanger, a pre-reactor, a centrifugal dryer, a storage tank, a catalyst, a trimming machine and a winding machine;
s2, adding polyvinyl alcohol generated by the bloom of the PVB resin into emulsified butyraldehyde, modifying the PVA by using a small amount of hydrochloric acid as a catalyst to obtain the PVB resin and byproduct water, and precipitating the PVB resin in the water;
s3, arranging a plate heat exchanger, sleeving a layer of hollow pipeline on a cold and hot pipe on the surface of the plate heat exchanger, arranging an air pump at the pipeline, and arranging a filter screen at the outlet of the hollow pipe;
s4, heating and dissolving, wherein in the dissolving process, pure water is used as a solvent, the solvent is heated by a heating system of the extruder, the heat energy of the heating system can be dissipated into the inner cavity of the extruder, the conveyed solvent is heated by the generated heat energy, and a raw material PVA is input in the heating process to be fully dissolved;
s5, cooling and forming, connecting the dissolved solvent with a hollow pipe through a conduit, starting an air pump arranged on the surface of the hollow pipe to convey the solvent into the hollow pipe, starting a plate heat exchanger when cooling is needed, performing heat exchange through a half plate through a thin rectangular channel formed between various plate sheets through the working principle of the plate heat exchanger, radiating the generated low temperature in the hollow pipe sleeved on the surface of a cold and hot pipe, performing cold and heat exchange on the heated solvent through the low temperature to finish the cooling effect, filtering through a filter screen arranged at a discharge port of the hollow pipe, taking out impurities in the solvent, and collecting the filtered solvent through a storage tank;
s6, adding an emulsifier, pouring the cooled PVA solution into a bloom device, slowly injecting a small amount of the emulsifier, and performing bloom by using butyraldehyde on a specific blade at a set speed;
s7, adding a catalyst, adding a bloom material into the catalyst, forming a uniform part in a pre-reactor, performing prepolymerization, and synthesizing a polymer PVB through condensation;
and S8, collecting finished products, washing granular PVB particles by water, drying by a centrifugal drier after washing, obtaining a PVB product, cutting edges of the PVB product by an edge cutter, and winding by a winding machine after cutting edges.
Further, the precipitation time in the step of S2 was 20 min.
Further, the mesh of the filter net in the step S3 is 20 um.
Further, the temperature of heating in the step S4 was 95 ℃.
Further, the temperature of cooling in the step S5 is 10 degrees.
Further, the speed of the blade in the step of S6 is 20 rpm.
Further, the pre-reactor time in the step S7 was 20 min.
Further, the time of the centrifugal drier in the step S8 is 10min
The PVB film has a required smooth surface, the thickness error of the 0.76mm film is within 0.02mm, the error within 50mm in the longitudinal and transverse directions is less than 0.006mm, the moisture content is less than 0.35%, and the natural audience rating is less than 12%.
And those not described in detail in this specification are well within the skill of those in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A PVB production process based on plate heat exchanger cooling is characterized in that: the method specifically comprises the following steps:
s1, preparing materials, namely pure water, butyraldehyde, a plate heat exchanger, a pre-reactor, a centrifugal dryer, a storage tank, a catalyst, a trimming machine and a winding machine;
s2, adding polyvinyl alcohol generated by the bloom of the PVB resin into emulsified butyraldehyde, modifying the PVA by using a small amount of hydrochloric acid as a catalyst to obtain the PVB resin and byproduct water, and precipitating the PVB resin in the water;
s3, arranging a plate heat exchanger, sleeving a layer of hollow pipeline on a cold and hot pipe on the surface of the plate heat exchanger, arranging an air pump at the pipeline, and arranging a filter screen at the outlet of the hollow pipe;
s4, heating and dissolving, wherein in the dissolving process, pure water is used as a solvent, the solvent is heated by a heating system of the extruder, the heat energy of the heating system can be dissipated into the inner cavity of the extruder, the conveyed solvent is heated by the generated heat energy, and a raw material PVA is input in the heating process to be fully dissolved;
s5, cooling and forming, connecting the dissolved solvent with a hollow pipe through a conduit, starting an air pump arranged on the surface of the hollow pipe to convey the solvent into the hollow pipe, starting a plate heat exchanger when cooling is needed, performing heat exchange through a half plate through a thin rectangular channel formed between various plate sheets through the working principle of the plate heat exchanger, radiating the generated low temperature in the hollow pipe sleeved on the surface of a cold and hot pipe, performing cold and heat exchange on the heated solvent through the low temperature to finish the cooling effect, filtering through a filter screen arranged at a discharge port of the hollow pipe, taking out impurities in the solvent, and collecting the filtered solvent through a storage tank;
s6, adding an emulsifier, pouring the cooled PVA solution into a bloom device, slowly injecting a small amount of the emulsifier, and performing bloom by using butyraldehyde on a specific blade at a set speed;
s7, adding a catalyst, adding a bloom material into the catalyst, forming a uniform part in a pre-reactor, performing prepolymerization, and synthesizing a polymer PVB through condensation;
and S8, collecting finished products, washing granular PVB particles by water, drying by a centrifugal drier after washing, obtaining a PVB product, cutting edges of the PVB product by an edge cutter, and winding by a winding machine after cutting edges.
2. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: the precipitation time in the step S2 is 10-20 min.
3. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: and in the step S3, the meshes of the filter screen are 10-20 um.
4. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: the heating temperature in the step S4 is 60-95 ℃.
5. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: the cooling temperature in the step S5 is 5-10 ℃.
6. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: the speed of the blade in the step S6 is 10-20 r/S.
7. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: the time of the pre-reactor in the step S7 is 10-20 min.
8. The PVB production process based on plate heat exchanger cooling of claim 1, wherein: and the time of the centrifugal dryer in the step S8 is 5-10 min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008019659A1 (en) * | 2006-08-18 | 2008-02-21 | Gea Ecoflex Gmbh | Plate heat exchanger |
| CN105693895A (en) * | 2016-04-23 | 2016-06-22 | 浙江德斯泰塑胶有限公司 | Additive and method for increasing utilization rate of butyraldehyde to prepare PVB resin by means of same |
| CN105713118A (en) * | 2016-04-23 | 2016-06-29 | 浙江德斯泰塑胶有限公司 | Production method capable of reducing water discharge in PVB resin production |
| CN110423295A (en) * | 2019-08-07 | 2019-11-08 | 青岛昊成实业有限公司 | A kind of PVB production technology and its application based on plate heat exchanger cooling |
-
2021
- 2021-11-19 CN CN202111376166.XA patent/CN113943385A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008019659A1 (en) * | 2006-08-18 | 2008-02-21 | Gea Ecoflex Gmbh | Plate heat exchanger |
| CN105693895A (en) * | 2016-04-23 | 2016-06-22 | 浙江德斯泰塑胶有限公司 | Additive and method for increasing utilization rate of butyraldehyde to prepare PVB resin by means of same |
| CN105713118A (en) * | 2016-04-23 | 2016-06-29 | 浙江德斯泰塑胶有限公司 | Production method capable of reducing water discharge in PVB resin production |
| CN110423295A (en) * | 2019-08-07 | 2019-11-08 | 青岛昊成实业有限公司 | A kind of PVB production technology and its application based on plate heat exchanger cooling |
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