CN114773587B - Epoxy propane removal process for PPC production process - Google Patents
Epoxy propane removal process for PPC production process Download PDFInfo
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- CN114773587B CN114773587B CN202210521034.XA CN202210521034A CN114773587B CN 114773587 B CN114773587 B CN 114773587B CN 202210521034 A CN202210521034 A CN 202210521034A CN 114773587 B CN114773587 B CN 114773587B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 210000000078 claw Anatomy 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 5
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000000605 extraction Methods 0.000 abstract description 9
- 238000005520 cutting process Methods 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 21
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000003960 organic solvent Substances 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000000638 solvent extraction Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000004094 preconcentration Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
- C08G64/40—Post-polymerisation treatment
- C08G64/403—Recovery of the polymer
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention provides an epoxypropane removal process used in a PPC production process, which comprises the following steps: customizing an SCP unit consisting of an SCP horizontal self-cleaning reactor, arranging a discharging bin at the discharging end of the lower part of the SCP unit, and simultaneously connecting with a feeding port of a double-screw extruder to ensure that the SCP unit and the double-screw extruder form the same whole to form a double-screw PO removing unit; the material enters an SCP unit in a constant discharging amount, and is subjected to operations such as steam heating, vacuum extraction, main shaft rotation stirring, claw cutting and the like, wherein about 90% of light component propylene oxide is extracted, the material is changed into a small spherical solid block from viscous liquid in the process, and then enters a double-screw extruder through an SCP discharging bin, and further is subjected to heating, vacuum extraction and extraction to completely extract volatile components including propylene oxide and propylene carbonate, so that the quality index of a given PPC product is achieved.
Description
Technical Field
The invention relates to the technical field of fine chemical engineering, in particular to an epoxypropane removal process used in a PPC production process.
Background
The PPC degradable plastic is a high molecular polymer, the viscosity is higher, the proportion of the PPC increases along with the reaction in the traditional production process, the viscosity of materials rises along with the increase, after the reaction is carried out to a certain extent and the viscosity of the materials reaches 1500cps, the reaction must be manually stopped, and propylene oxide which does not participate in the reaction exists in a liquid form, so that the PPC is dissolved, and the fluidity of the materials is ensured to meet the process requirement. The CN112358607a patent in the prior art proposes adding a third organic solvent during the reaction to ensure that propylene oxide is fully involved in the reaction, but PPC remains dissolved in the organic solvent after the reaction is completed. In both cases, solvent removal is required, and the PPC product can be produced by a post-treatment procedure of refining.
The post-treatment technology in the PPC production technology in the industry at present, namely the epoxypropane (or other organic solvents for PPC synthesis) removal technology, mainly comprises two types of solvent extraction technology, and the second type is a double-screw devolatilization technology.
The existing solvent extraction technology is to extract PPC by using organic solvents such as ethanol, and the like, and specifically comprises the following steps of adding ethanol or other organic solvents into synthesized PPC slurry after the reaction is finished, extracting PPC materials into ethanol or other organic solvent phases, separating propylene oxide, adding extracting solution such as hydrochloric acid and the like into the organic solvent phases to separate PPC out, so as to achieve the purpose of separating and purifying PPC, wherein the technology has the following defects: although the purity of the produced PPC is higher, the separation and purification process is complicated, the recycling difficulty of propylene oxide is increased, the production energy consumption is higher, and a large amount of process wastewater is generated in the process, so that the process is difficult to treat and the environment is polluted.
The existing double-screw devolatilization technology utilizes the physical characteristic of low boiling point of propylene oxide or other organic solvents participating in PPC synthesis, and the materials are separated by adopting a means of heating and vacuum extraction simultaneously when passing through a double-screw unit, so that the purpose of purifying PPC is achieved.
The invention is mainly based on the problems of high energy consumption, high wastewater yield, environmental pollution, small treatment capacity and the like in the PPC post-treatment technology, and invents a new generation of SCP devolatilization post-treatment technology to improve the production capacity before simplifying the PPC post-treatment technology.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a new technology for an epoxy propane removal process in a PPC production process, belongs to the technical innovation of the PPC production process, can reduce the difficulty of post-treatment processes such as PO or other solvent removal processes in the PPC production process, reduces the production energy consumption and improves the device production capacity, and adopts the technical scheme that:
an oxypropane removal process for use in a PPC production process, comprising: customizing an SCP unit consisting of an SCP horizontal self-cleaning reactor, arranging a discharging bin at the discharging end of the lower part of the SCP unit, and simultaneously connecting with a feeding port of a double-screw extruder to ensure that the SCP unit and the double-screw extruder form the same whole to form a double-screw PO removing unit;
the material enters an SCP unit in a constant discharging amount, and is subjected to operations such as steam heating, vacuum extraction, main shaft rotation stirring, claw cutting and the like, wherein about 90% of light component propylene oxide is extracted, the material is changed into a small spherical solid block from viscous liquid in the process, and then enters a double-screw extruder through an SCP discharging bin, and further is subjected to heating, vacuum extraction and extraction to completely extract volatile components including propylene oxide and propylene carbonate, so that the quality index of a given PPC product is achieved.
Preferably, a material feeding pipeline and a vacuum exhaust pipeline are arranged on the upper portion of the SCP unit, a material observation mirror and a camera are arranged at the same time, a DCS screen is electrically connected with the material observation mirror and the camera, and a vacuum condensate buffer tank, a cooler and a vacuum pump are sequentially arranged at the rear portion of the vacuum pipeline.
Preferably, a vacuum pipeline and an observation mirror are arranged on the double-screw extruder, and a vacuum condensate buffer tank, a cooler and a vacuum pump are arranged at the rear part of the vacuum pipeline.
The beneficial effects of the invention are as follows:
the invention aims at the characteristics of high viscosity, easy degradation and the like of materials in the PPC production process, and experiments prove that the SCP horizontal self-cleaning reactor can be suitable for the PPC post-treatment process and can be matched with a double-screw extruder for application, thereby avoiding the problems of high energy consumption, high pollution and the like in the solvent extraction technology, and avoiding the problems of small treatment capacity, incomplete removal of light components and the like in the double-screw devolatilization technology.
The SCP horizontal reactor and the double-screw devolatilizer are creatively combined together, so that the technical bottleneck of small material handling capacity of the double-screw devolatilizer is solved.
The invention simplifies the production difficulty of the PPC post-treatment process, reduces the production energy consumption, simultaneously has the volume area of the SCP horizontal reactor far smaller than that of a double-screw devolatilizer with the same treatment capacity, has lower equipment cost and site requirements, and breaks through the technical problem of the ten-thousand-ton PPC post-treatment process.
Compared with the solvent extraction process and the double screw extrusion process in the background art, the SCP devolatilization post-treatment technology adopted by the invention has the advantages of no wastewater pollution, separated epoxypropane, recycling, high treatment capacity of monomer equipment and the like.
Drawings
FIG. 1 is a flow chart of a process for removing propylene oxide in the PPC production process provided by the invention
Fig. 2 is a schematic diagram of the internal structure of the SCP unit.
In the shown drawing, a material feeding pipeline 1, a vacuum exhaust pipeline 2, a vacuum condensate buffer tank 3, a cooler 4, a vacuum pump 5, a double-screw PO removing unit 6, a shell 6-1, a main shaft 6-2, a hook claw 6-3, a hollow cavity 6-4, a PPC feeding system 7, a polymer flash tank 8, a PO removing pre-concentration machine 9, an anti-sticking material feeder 10, a granulator 11 and a centrifugal dehydrator 12.
Detailed Description
The present invention is described in further detail below to enable those skilled in the art to practice the invention by reference to the specification and drawings.
The propylene oxide removal process used in the PPC production process comprises the following steps:
the SCP unit formed by the SCP horizontal self-cleaning reactor with the cavity volume of 2000L is customized according to actual production data, wherein the SCP horizontal self-cleaning reactor is commonly used for the processes of high polymer (or related to a high-viscosity material system) reaction polymerization, high-capacity devolatilization, heat and mass transfer, mixing and kneading, evaporation concentration, phase-change crystallization and the like, has the advantages of short flow, continuity, high efficiency and the like, and is widely applied to the rubber product industry, and the internal structure is shown in the following figure 2: the device comprises a device shell 6-1, a main shaft 6-2 and a hook claw 6-3, wherein a hollow cavity 6-4 is arranged outside the device main shaft 6-2, steam can be introduced for heating, the device shell 6-1 is a double-layer interlayer, and steam can also be introduced for heating materials; the theoretical treatment capacity is 2.5 tons/hour, a material feeding pipeline 1 and a vacuum exhaust pipeline 2 are arranged at the upper part of the equipment, and a material observation mirror and a camera are arranged at the same time, so that the condition of the materials in the equipment can be reflected to a DCS screen in real time. The rear part of the vacuum pipeline is sequentially provided with a vacuum condensate buffer tank 3, a cooler 4 and a vacuum pump 5.
The discharging end at the lower part of the SCP unit is provided with a discharging bin and is connected with the feeding port of the double-screw extruder at the same time, so that the SCP unit and the double-screw extruder form the same whole to form the double-screw PO removing unit 6, wherein the design processing capacity of the double-screw extruder is 1.5 tons/h, and meanwhile, the double-screw extruder is also provided with a vacuum pipeline and an observation mirror, as shown in figure 1, and the rear part of the vacuum pipeline is provided with a vacuum condensate buffer tank 3, a cooler 4 and a vacuum pump 5. Thus, a PPC post-treatment process for removing propylene oxide and a PPC devolatilization technique, namely an SCP devolatilization post-treatment technique described herein, are formed.
As shown in FIG. 1, during production, the PPC feeding system 7 is fed with a constant feeding amount of 2.0-2.5m after passing through a polymer flash tank 8 and a PO removal preconcentrator 9 3 And (3) entering an SCP unit, heating by steam heating, vacuum extraction, rotating and stirring a main shaft 6-2, cutting materials by a hook claw 6-3, and the like, wherein about 90% of light component propylene oxide is extracted, the materials are changed into small spherical solid blocks from viscous liquid in the process, then enter a double-screw extruder through an SCP discharging bin, further heating and heating, and vacuum extraction are performed, and all volatile components including propylene oxide and propylene carbonate are extracted, so that the quality index of a given PPC product is achieved. The technological indexes in the technological operation process are as follows, SCP set control temperature 130-150 ℃, vacuum degree 20-50 KPa (A), twin-screw extruder control temperature 150-170 ℃, vacuum degree 3-10 KPa (A), and cooler 4 control temperature-5-0 ℃.
SCP unit feeding amount control 2.0-2.5m 3 And/h, controlling the discharging speed of the double-screw extruder to be 1-1.5m 3 And/h, controlling the recovery amount of volatile components of the condensing system to be 0.8m 3 /h-1.2m 3 And/h, recovering the residual volatile components in an exhaust system.
The materials passing through the double screw extruder are produced through the subsequent procedures of a material sticking prevention feeder 10, a granulator 11, a centrifugal dehydrator 12 and the like.
The invention aims at the characteristics of high viscosity, easy degradation and the like of materials in the PPC production process, and experiments prove that the SCP horizontal self-cleaning reactor can be suitable for the PPC post-treatment process and can be matched with a double-screw extruder for application, thereby avoiding the problems of high energy consumption, high pollution and the like in the solvent extraction technology, and avoiding the problems of small treatment capacity, incomplete removal of light components and the like in the double-screw devolatilization technology.
The SCP horizontal reactor and the double-screw devolatilizer are creatively combined together, so that the technical bottleneck of small material handling capacity of the double-screw devolatilizer is solved.
The invention simplifies the production difficulty of the PPC post-treatment process, reduces the production energy consumption, simultaneously has the volume area of the SCP horizontal reactor far smaller than that of a double-screw devolatilizer with the same treatment capacity, has lower equipment cost and site requirements, and breaks through the technical problem of the ten-thousand-ton PPC post-treatment process.
Compared with the solvent extraction process and the double screw extrusion process in the background art, the SCP devolatilization post-treatment technology adopted by the invention has the advantages of no wastewater pollution, separated epoxypropane, recycling, high treatment capacity of monomer equipment and the like.
The production measurement and calculation are carried out at the present stage, the PC content in the PPC material processed by the SCP devolatilization post-processing technology is less than 2%, the melt index of the material is below 5g/10min, the national standard is met, the processing capacity of a single device can reach 1 ten thousand tons per year, the processing capacity of the single device can reach 5 ten thousand tons per year through further amplification of the technology, and the technology support is provided for the construction of 10 ten thousand tons of PPC and million tons of PPC devices.
Although embodiments of the invention have been disclosed above, they are not limited to the use listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Further modifications may readily be effected by those skilled in the art, and the invention is therefore not limited to the particular details without departing from the general concept defined by the claims and the equivalents thereof.
Claims (2)
1. An oxypropane removal process for PPC production, comprising: customizing an SCP unit consisting of an SCP horizontal self-cleaning reactor, arranging a discharging bin at the discharging end of the lower part of the SCP unit, and simultaneously connecting with a feeding port of a double-screw extruder to ensure that the SCP unit and the double-screw extruder form the same whole to form a double-screw PO removing unit;
the material enters an SCP unit in a constant discharging amount, is heated by steam heating, is extracted in vacuum, is rotationally stirred by a main shaft, is cut by a hook claw, 90% of light component propylene oxide is extracted, is changed into a small spherical solid block from viscous liquid in the process, enters a double screw extruder through an SCP discharging bin, is further heated and is extracted in vacuum, and volatile components including propylene oxide and propylene carbonate are extracted completely;
a material feeding pipeline and a vacuum exhaust pipeline are arranged on the upper portion of an SCP unit, a material observation mirror and a camera are arranged at the same time, a DCS screen is electrically connected with the material observation mirror and the camera, and a vacuum condensate buffer tank, a cooler and a vacuum pump are sequentially arranged at the rear portion of the vacuum pipeline.
2. The process for removing propylene oxide in the PPC production process according to claim 1, wherein a vacuum pipeline and a viewing mirror are arranged on a double-screw extruder, and a vacuum condensate buffer tank, a cooler and a vacuum pump are arranged at the rear part of the vacuum pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210521034.XA CN114773587B (en) | 2022-05-12 | 2022-05-12 | Epoxy propane removal process for PPC production process |
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| CN202210521034.XA CN114773587B (en) | 2022-05-12 | 2022-05-12 | Epoxy propane removal process for PPC production process |
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| CN114773587A CN114773587A (en) | 2022-07-22 |
| CN114773587B true CN114773587B (en) | 2023-11-10 |
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| CN115716911A (en) * | 2022-11-18 | 2023-02-28 | 山东联欣环保科技有限公司 | Devolatilization method and devolatilization system |
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| CN109503935A (en) * | 2018-12-14 | 2019-03-22 | 大韩道恩高分子材料(上海)有限公司 | A kind of low smell high transparency super-high fluidity polypropylene and its preparation facilities and method |
| CN112290703A (en) * | 2020-11-13 | 2021-01-29 | 江苏诚盟装备股份有限公司 | Rotary-propelling self-cleaning E-shaped rotor |
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- 2022-05-12 CN CN202210521034.XA patent/CN114773587B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006291001A (en) * | 2005-04-08 | 2006-10-26 | Mitsubishi Gas Chem Co Inc | Method for producing polyacetal resin composition reduced in formaldehyde content |
| CN109503935A (en) * | 2018-12-14 | 2019-03-22 | 大韩道恩高分子材料(上海)有限公司 | A kind of low smell high transparency super-high fluidity polypropylene and its preparation facilities and method |
| CN112290703A (en) * | 2020-11-13 | 2021-01-29 | 江苏诚盟装备股份有限公司 | Rotary-propelling self-cleaning E-shaped rotor |
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