CN112079945A - Chlorinated polyethylene manufacturing process - Google Patents
Chlorinated polyethylene manufacturing process Download PDFInfo
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- CN112079945A CN112079945A CN202010943955.6A CN202010943955A CN112079945A CN 112079945 A CN112079945 A CN 112079945A CN 202010943955 A CN202010943955 A CN 202010943955A CN 112079945 A CN112079945 A CN 112079945A
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- 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
- C08F8/18—Introducing halogen atoms or halogen-containing groups
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Abstract
The invention discloses a chlorinated polyethylene manufacturing process, which comprises the following steps: s01: preparing hydrochloric acid into hydrochloric acid phase suspension liquid by polyethylene in a batching kettle, and introducing the hydrochloric acid phase suspension liquid into a chlorination reaction kettle; s02: under the precise control of a heat control system, chlorine is introduced into the reaction kettle, and after the chlorination reaction is finished, a flat rotary disc vacuum filter is used for continuous deacidification, washing and discharging; s03: continuously feeding the deacidified wet material into a screw screen centrifuge for drying treatment; s04: drying, inputting into a reaction kettle, carrying out neutralization treatment by introducing liquid caustic soda and weak caustic soda water, conveying to the next screw screen centrifuge for drying treatment after neutralization is finished, and returning separated weak caustic soda water to a weak caustic soda water tank; s05: inputting the dried material into a fluidized drying bed, carrying out further drying process, and discharging qualified materials after treatment; the invention omits two procedures of water washing and washing breaking, has obvious energy-saving effect, high whiteness of the product, uniform particles and uniform chlorine content.
Description
Technical Field
The invention belongs to the technical field of polyethylene processes, and particularly relates to a chlorinated polyethylene manufacturing process.
Background
The polyethylene is a thermoplastic resin prepared by polymerizing ethylene, and also comprises a copolymer of ethylene and a small amount of alpha-olefin in industry, the polyethylene is odorless and nontoxic, has wax-like hand feeling, excellent low-temperature resistance, good chemical stability, resistance to corrosion of most of acid and alkali, insolubility in common solvents at normal temperature, small water absorption, excellent electrical insulation, and the production process: there are mainly two types, high-pressure tubular method and kettle method. In order to reduce the reaction temperature and pressure, the tubular process generally adopts a low-temperature high-activity initiator to initiate a polymerization system, high-purity ethylene is used as a main raw material, propylene/propane and the like are used as a density regulator, a high-activity initiator is used for carrying out polymerization reaction under the conditions of about 200-330 ℃ and 150-300 MPa, a polymerized molten polymer is initiated in a reactor, the high-pressure, medium-pressure and low-pressure cooling and separation are needed, high-pressure circulating gas is cooled and separated and then sent into an inlet of an ultrahigh-pressure compressor, medium-pressure circulating gas is cooled and separated and then sent into an inlet of the high-pressure compressor, low-pressure circulating gas is cooled and separated and then sent into a low-pressure compressor for recycling, the molten polyethylene is separated under high pressure and low pressure and then sent into a granulator for granulating in water, and during the granulation, enterprises can add proper additives according to different, the granules are packaged and delivered out of the factory.
The existing polyethylene preparation process has certain disadvantages in the using process, the product quality is not good enough, the utilization rate of chlorine is low, caking is easy to occur during reaction, large-scale production is not easy to expand, water washing and breaking washing are also needed, weak base is not recovered to facilitate secondary utilization, and further improvement and reinforcement are needed.
Disclosure of Invention
The invention aims to provide a chlorinated polyethylene manufacturing process, which mainly solves the following technical problems:
the product has poor quality, low utilization rate of chlorine, easy caking during reaction, difficult scale-up production, additional washing and breaking washing, and no recovery of weak base for secondary utilization.
The purpose of the invention can be realized by the following technical scheme:
a chlorinated polyethylene preparation process comprises the following steps:
s01: preparing hydrochloric acid into hydrochloric acid phase suspension liquid by polyethylene in a batching kettle, and introducing the hydrochloric acid phase suspension liquid into a chlorination reaction kettle;
s02: under the precise control of a heat control system, chlorine is introduced into the reaction kettle, and after the chlorination reaction is finished, a flat rotary disc vacuum filter is used for continuous deacidification, washing and discharging;
s03: continuously feeding the deacidified wet material into a screw screen centrifuge for drying treatment;
s04: drying, inputting into a reaction kettle, carrying out neutralization treatment by introducing liquid caustic soda and weak caustic soda water, conveying to the next screw screen centrifuge for drying treatment after neutralization is finished, and returning separated weak caustic soda water to a weak caustic soda water tank;
s05: and (4) inputting the dried material into a fluidized drying bed, carrying out further drying process treatment, and discharging qualified materials after treatment.
As a further scheme of the invention: the weight of the polyethylene is 3.3 tons, the concentration of the hydrochloric acid is 1% -19.9%, and the weight of the chlorine is 4 tons.
As a further scheme of the invention: the control system in S02 controlled the temperature in the reaction vessel to 25 ℃.
As a further scheme of the invention: the reaction time of the reaction vessel in S02 was 90 minutes.
As a further scheme of the invention: and S04, controlling the pH value to be 8 when liquid alkali and weak alkali water are introduced for neutralization treatment, discharging after neutralization for 120 minutes, and removing salt through introduced process water.
As a further scheme of the invention: the boiling drying bed in the S05 is a boiling dryer used for drying wet materials.
The invention has the beneficial effects that:
the method has the advantages that two procedures of water washing and breaking washing are omitted, the energy-saving effect is remarkable, the obtained product is high in whiteness, uniform in particles and chlorine content and free of salt, the chlorine is introduced, the reaction between chlorine and polyethylene is fully utilized, the utilization of chlorine is increased, the polyethylene is more convenient to manufacture, and the separated weak alkaline water can be recycled.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of the manufacturing process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example 1
As shown in fig. 1, a chlorinated polyethylene production process includes the following steps:
s01: preparing hydrochloric acid into hydrochloric acid phase suspension liquid by polyethylene in a batching kettle, and introducing the hydrochloric acid phase suspension liquid into a chlorination reaction kettle;
s02: under the precise control of a heat control system, chlorine is introduced into the reaction kettle, and after the chlorination reaction is finished, a flat rotary disc vacuum filter is used for continuous deacidification, washing and discharging;
s03: continuously feeding the deacidified wet material into a screw screen centrifuge for drying treatment;
s04: drying, inputting into a reaction kettle, carrying out neutralization treatment by introducing liquid caustic soda and weak caustic soda water, conveying to the next screw screen centrifuge for drying treatment after neutralization is finished, and returning separated weak caustic soda water to a weak caustic soda water tank;
s05: inputting the dried material into a fluidized drying bed, carrying out further drying process, and discharging qualified materials after treatment;
the weight of polyethylene was 3.3 tons, the concentration of hydrochloric acid was 1%, and the weight of chlorine was 4 tons; the control system in S02 controls the temperature in the reaction kettle to be 25 ℃; the reaction time of the reaction kettle in the S02 is 90 minutes; s04, controlling the pH value to be 8 when introducing liquid alkali and weak alkali water for neutralization treatment, discharging after neutralizing for 120 minutes, and removing salt through introduced process water; the ebullient dryer bed in S05 is an ebullient dryer for drying wet materials.
Example 2
As shown in fig. 1, a chlorinated polyethylene production process includes the following steps:
s01: preparing hydrochloric acid into hydrochloric acid phase suspension liquid by polyethylene in a batching kettle, and introducing the hydrochloric acid phase suspension liquid into a chlorination reaction kettle;
s02: under the precise control of a heat control system, chlorine is introduced into the reaction kettle, and after the chlorination reaction is finished, a flat rotary disc vacuum filter is used for continuous deacidification, washing and discharging;
s03: continuously feeding the deacidified wet material into a screw screen centrifuge for drying treatment;
s04: drying, inputting into a reaction kettle, carrying out neutralization treatment by introducing liquid caustic soda and weak caustic soda water, conveying to the next screw screen centrifuge for drying treatment after neutralization is finished, and returning separated weak caustic soda water to a weak caustic soda water tank;
s05: inputting the dried material into a fluidized drying bed, carrying out further drying process, and discharging qualified materials after treatment;
the weight of polyethylene was 3.3 tons, the concentration of hydrochloric acid was 19.9%, and the weight of chlorine was 4 tons; the control system in S02 controls the temperature in the reaction kettle to be 25 ℃; the reaction time of the reaction kettle in the S02 is 90 minutes; s04, controlling the pH value to be 8 when introducing liquid alkali and weak alkali water for neutralization treatment, discharging after neutralizing for 120 minutes, and removing salt through introduced process water; the ebullient dryer bed in S05 is an ebullient dryer for drying wet materials.
The working principle of the chlorinated polyethylene manufacturing process is as follows: polyethylene, hydrochloric acid and chlorine are mixed in a reaction kettle, after chlorination reaction is finished, a flat rotary disc vacuum filter is used for continuous deacidification washing and discharging, deacidified wet materials continuously enter a screw screen centrifuge for drying treatment, the dry materials are input into the reaction kettle, liquid alkali and weak alkaline water are introduced for neutralization treatment, the neutralized materials are conveyed to the next screw screen centrifuge for drying treatment after neutralization is finished, the separated weak alkaline water returns to a weak alkaline water tank, the dried materials are input into a fluidized drying bed for further drying process treatment, and qualified materials are discharged after treatment.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (6)
1. A chlorinated polyethylene manufacturing process is characterized by comprising the following steps:
s01: preparing hydrochloric acid into hydrochloric acid phase suspension liquid by polyethylene in a batching kettle, and introducing the hydrochloric acid phase suspension liquid into a chlorination reaction kettle;
s02: under the precise control of a heat control system, chlorine is introduced into the reaction kettle, and after the chlorination reaction is finished, a flat rotary disc vacuum filter is used for continuous deacidification, washing and discharging;
s03: continuously feeding the deacidified wet material into a screw screen centrifuge for drying treatment;
s04: drying, inputting into a reaction kettle, carrying out neutralization treatment by introducing liquid caustic soda and weak caustic soda water, conveying to the next screw screen centrifuge for drying treatment after neutralization is finished, and returning separated weak caustic soda water to a weak caustic soda water tank;
s05: and (4) inputting the dried material into a fluidized drying bed, carrying out further drying process treatment, and discharging qualified materials after treatment.
2. A process for preparing a chlorinated polyethylene according to claim 1, wherein the polyethylene has a content of 3.3 tons, the hydrochloric acid has a concentration of 1% to 19.9%, and the chlorine has a content of 4 tons.
3. A chlorinated polyethylene production process as claimed in claim 1, wherein the control system in S02 controls the temperature in the reaction kettle at 25 ℃.
4. A chlorinated polyethylene production process according to claim 1, wherein the reaction time of the reaction kettle in the S02 is 90 minutes.
5. A process for preparing chlorinated polyethylene according to claim 1, wherein the S04 is discharged 120 minutes after neutralization with the pH of 8 when the liquid alkali and the weak alkali water are introduced for neutralization, and the introduced process water is used to remove salt.
6. The chlorinated polyethylene production process of claim 1, wherein the ebullient dryer in S05 is an ebullient dryer for drying wet materials.
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| CN202010943955.6A CN112079945A (en) | 2020-09-09 | 2020-09-09 | Chlorinated polyethylene manufacturing process |
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| CN202010943955.6A CN112079945A (en) | 2020-09-09 | 2020-09-09 | Chlorinated polyethylene manufacturing process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102827313A (en) * | 2012-09-20 | 2012-12-19 | 山东瑞丰高分子材料股份有限公司 | Method for coproducing acid-phase-process synthesized chlorinated polyethylene and glycerol-process synthesized epoxy chloropropane |
| CN105175585A (en) * | 2015-10-14 | 2015-12-23 | 奉化市裕隆化工新材料有限公司 | Method for preparing chlorinated polyethylene in acid medium |
| CN105837713A (en) * | 2016-05-30 | 2016-08-10 | 广西锦华新材料科技有限公司 | Method for preparing high-insulating chlorinated polyethylene |
| CN105837712A (en) * | 2016-05-30 | 2016-08-10 | 广西锦华新材料科技有限公司 | Production line for producing chlorinated polyethylene |
| CN206544934U (en) * | 2017-02-28 | 2017-10-10 | 山东三义实业股份有限公司 | A kind of haloflex dealkalize water comprehensive reutilization system |
-
2020
- 2020-09-09 CN CN202010943955.6A patent/CN112079945A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102827313A (en) * | 2012-09-20 | 2012-12-19 | 山东瑞丰高分子材料股份有限公司 | Method for coproducing acid-phase-process synthesized chlorinated polyethylene and glycerol-process synthesized epoxy chloropropane |
| CN105175585A (en) * | 2015-10-14 | 2015-12-23 | 奉化市裕隆化工新材料有限公司 | Method for preparing chlorinated polyethylene in acid medium |
| CN105837713A (en) * | 2016-05-30 | 2016-08-10 | 广西锦华新材料科技有限公司 | Method for preparing high-insulating chlorinated polyethylene |
| CN105837712A (en) * | 2016-05-30 | 2016-08-10 | 广西锦华新材料科技有限公司 | Production line for producing chlorinated polyethylene |
| CN206544934U (en) * | 2017-02-28 | 2017-10-10 | 山东三义实业股份有限公司 | A kind of haloflex dealkalize water comprehensive reutilization system |
Non-Patent Citations (1)
| Title |
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| 李玉芳: "氯化聚乙烯的生产应用及市场分析", 《化工科技市场》 * |
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Application publication date: 20201215 |