CN108299628A - A kind of production method reducing diethylene glycol (DEG) in PET products - Google Patents
A kind of production method reducing diethylene glycol (DEG) in PET products Download PDFInfo
- Publication number
- CN108299628A CN108299628A CN201711431833.3A CN201711431833A CN108299628A CN 108299628 A CN108299628 A CN 108299628A CN 201711431833 A CN201711431833 A CN 201711431833A CN 108299628 A CN108299628 A CN 108299628A
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- CN
- China
- Prior art keywords
- diethylene glycol
- esterification
- pet products
- production method
- sylvite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
-
- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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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)
- Polyesters Or Polycarbonates (AREA)
Abstract
The invention discloses a kind of production methods of diethylene glycol (DEG) in reduction PET products, its use preset quality than sylvite, water and ethylene glycol additive solution is made, it is added in slurry preparation or in first esterification reactor, the generation for inhibiting diethylene glycol (DEG) in reaction process by potassium ion, makes the content of diethylene glycol (DEG) in final PET products reduce.The production method of the present invention is easily achieved, and precision controlling effect is good, is capable of providing the PET products of the low DEG content of stable quality.
Description
Technical field
The present invention relates to a kind of production methods of diethylene glycol (DEG) in reduction PET products.
Background technology
In polyethylene terephthalate (abbreviation PET) production process, the macromolecular by-product of ether-containing key is will produce,
This kind of by-product is referred to as diethylene glycol (DEG) (vehicle economy G) in PET productions.DEG is used as a quality index in PET final products
There is stringent quality control clearance.The generation of diethylene glycol (DEG) can make product heat resistance be deteriorated, PET product of the user to low content DEG
It is in need.Need the generation of diethylene glycol (DEG) in reduction PET products.
Invention content
The present invention provides it is a kind of reduction PET products in diethylene glycol (DEG) production method, use preset quality than sylvite,
Additive solution is made in water and ethylene glycol, is added in slurry preparation or in esterifier, inhibits to react by potassium ion
The generation of diethylene glycol (DEG) in the process makes the content of diethylene glycol (DEG) in final PET products reduce.
To realize the above-mentioned technical purpose, present invention employs following technical solutions：
A kind of production method reducing diethylene glycol (DEG) in PET products, which is characterized in that including following production stage：
Step (1) will be configured to sylvite water glycol solution in sylvite, water and ethylene glycol input additive preparing tank, press
Mass percent meter, in prepared solution potassium concentration be 1-8%, water content 0-5%；
Step (2), using ethylene glycol and terephthalic acid (TPA) as raw material, be added to slurry preparation by preset ratio after metering
In tank, the slurry after preparation is sent into first esterification reactor by mashing pump and carries out first time esterification after metering；
Prepared sylvite water glycol solution in step (1) is added in step (2) by step (3) using metering pump
Slurry preparation in or first esterification reactor in or by a certain percentage simultaneously be added to slurry preparation and first esterification
In reactor；
Principal product completely reacted in first esterification reactor in step (3) is sent to the second esterifier by step (4),
Reaction system is discharged in by-product after being detached by process tower, the carboxylate that first esterification reactor obtains is in the second esterifier
Further esterification；
The carboxylate that the second esterifier obtains in step (4) is pumped into first polycondensation reaction by step (5) by conveying
Device carries out polycondensation reaction and forms prepolymer, and prepolymer is sent to the second polycondensation reactor by delivery pump after filtering, forms PET productions
Product.
Preferably, the sylvite selects inorganic salts or organic salt containing potassium ion.
Preferably, potassium content is in 1-10mg/Kg in the PET products obtained in step (1)-(4).
By adopting the above-described technical solution, the present invention has the following technical effect that：The micro of additive is matched in the present invention
Side changes and the investing method of selection additive is easily achieved, and precision controlling effect is good, can be the system of high-strength flatness industrial yarn
It is standby to provide stability good PET products materials.
Description of the drawings
Fig. 1 is the process flow chart of the production method of the present invention.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
Attached drawing 1 is shown the invention discloses a kind of process flow chart of the production method of diethylene glycol (DEG) in reduction PET products,
Including following key step：
Step (1), catalyst ingredients：Additive is configured to and by metering pump to slurry using sylvite, water and ethylene glycol
It adds, can also be added into slurry preparation and simultaneously in first esterification reactor, to reach in tank or first esterification reactor
To the purpose for changing PET properties of product；
Step (2), raw material are prepared：After metering by two kinds of primary raw materials of ethylene glycol and terephthalic acid (TPA), in slurry preparation
It is mixed in a certain ratio in tank and is configured to slurry, first esterification reactor is then sent to by mashing pump after metering；
Step (3), esterification：Main esterification is completed in first esterification reactor under the conditions of given technological reaction
Reaction, completely reacted principal product are sent to the second esterifier, and reaction system is discharged after being detached by process tower in by-product；
Step (4), polycondensation reaction：Carboxylate by conveying is pumped into first after being further esterified in the second esterifier
Polycondensation reactor carries out polycondensation reaction, so that the chain of reactant is further increased, esterification yield forms prepolymer after further increasing；In advance
Polymers is sent to the second polycondensation reactor by delivery pump after filtering, completes last esterification and polycondensation reaction, needed for formation
The PET melt product wanted；
Step (5), PET are granulated：Melt product forms final products PET through pelletizing and is sliced particle, and slice particle is through drying
Moisture removal, then the screened different shape particle of removal are removed, weighing and bagging is carried out after screening.
Following table 1 is production method using the present invention, when producing PET products, the addition of sylvite and PET obtained
The data comparison table of DEG content in product.
Table 1
The production method using the present invention it can be seen from the data of table 1 can obtain the PET productions of low content diethylene glycol (DEG)
Product are changed by the micro-formula of additive, reduce the content of diethylene glycol (DEG) in PET products, and due to the additive of preparation
Middle main component will not introduce other impurity using the ethylene glycol of one of main material, save the processes such as follow-up removal of impurities, and be catalyzed
A small amount of water is added in agent, can promote mixing for sylvite and ethylene glycol, the solution of additive obtained is evenly.
The invention is not limited in specific implementation modes above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (3)
1. a kind of production method reducing diethylene glycol (DEG) in PET products, which is characterized in that including following production stage：
Step（1）, will sylvite, water and ethylene glycol put into additive preparing tank in be configured to sylvite water glycol solution, by quality
Percentages, in prepared solution potassium concentration be 1-8%, water content 0-5%；
Step（2）, using ethylene glycol and terephthalic acid (TPA) as raw material, be added to slurry preparation by preset ratio after metering
In, the slurry after preparation is sent into first esterification reactor by mashing pump and carries out first time esterification after metering；
Step（3）, using metering pump by step（1）In prepared sylvite water glycol solution be added to step（2）In slurry
Material preparing tank in or first esterification reactor in or by a certain percentage simultaneously be added to slurry preparation and the first esterification
In device；
Step（4）, by step（3）Completely reacted principal product is sent to the second esterifier, by-product in middle first esterification reactor
Reaction system is discharged in object after being detached by process tower, the carboxylate that first esterification reactor obtains is in the second esterifier into one
Step esterification；
Step（5）, by step（4）In the obtained carboxylate of the second esterifier by convey be pumped into first polycondensation reaction device into
Row polycondensation reaction forms prepolymer, and prepolymer is sent to the second polycondensation reactor by delivery pump after filtering, forms PET products.
2. a kind of production method reducing diethylene glycol (DEG) in PET products, it is characterised in that：The sylvite is selected containing the inorganic of potassium ion
Salt or organic salt.
3. a kind of production method reducing diethylene glycol (DEG) in PET products, it is characterised in that：The step（1）-（5）In obtained PET
Potassium content is in 1-10mg/Kg in product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431833.3A CN108299628A (en) | 2017-12-26 | 2017-12-26 | A kind of production method reducing diethylene glycol (DEG) in PET products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711431833.3A CN108299628A (en) | 2017-12-26 | 2017-12-26 | A kind of production method reducing diethylene glycol (DEG) in PET products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108299628A true CN108299628A (en) | 2018-07-20 |
Family
ID=62867847
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711431833.3A Pending CN108299628A (en) | 2017-12-26 | 2017-12-26 | A kind of production method reducing diethylene glycol (DEG) in PET products |
Country Status (1)
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| CN (1) | CN108299628A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608628A (en) * | 2018-11-30 | 2019-04-12 | 江阴赛胜新材料有限公司 | The preparation method of industrial yarn polyethylene terephthalate |
| CN111410733A (en) * | 2020-04-26 | 2020-07-14 | 扬州御泓再生资源有限公司 | Processing technology of special material for producing regenerated polyester for chemical fibers |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6487807A (en) * | 1987-09-30 | 1989-03-31 | Toshiba Corp | Turbine trip protector |
| CN1752139A (en) * | 2004-09-24 | 2006-03-29 | 齐默尔股份公司 | Mixture, polyester composition, film and method for producing the same |
| CN107201567A (en) * | 2017-06-22 | 2017-09-26 | 江苏三房巷集团有限公司 | A kind of preparation method of the super imitative cotton polyester fiber of continuous polymerization fused mass directly spinning |
-
2017
- 2017-12-26 CN CN201711431833.3A patent/CN108299628A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6487807A (en) * | 1987-09-30 | 1989-03-31 | Toshiba Corp | Turbine trip protector |
| CN1752139A (en) * | 2004-09-24 | 2006-03-29 | 齐默尔股份公司 | Mixture, polyester composition, film and method for producing the same |
| CN107201567A (en) * | 2017-06-22 | 2017-09-26 | 江苏三房巷集团有限公司 | A kind of preparation method of the super imitative cotton polyester fiber of continuous polymerization fused mass directly spinning |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109608628A (en) * | 2018-11-30 | 2019-04-12 | 江阴赛胜新材料有限公司 | The preparation method of industrial yarn polyethylene terephthalate |
| CN109608628B (en) * | 2018-11-30 | 2021-10-15 | 江阴赛胜新材料有限公司 | Preparation method of polyethylene terephthalate for industrial yarn |
| CN111410733A (en) * | 2020-04-26 | 2020-07-14 | 扬州御泓再生资源有限公司 | Processing technology of special material for producing regenerated polyester for chemical fibers |
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Application publication date: 20180720 |