CN102492129A - Method for reducing content of acetaldehyde in granulated polyester slice - Google Patents
Method for reducing content of acetaldehyde in granulated polyester slice Download PDFInfo
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- CN102492129A CN102492129A CN2011104173805A CN201110417380A CN102492129A CN 102492129 A CN102492129 A CN 102492129A CN 2011104173805 A CN2011104173805 A CN 2011104173805A CN 201110417380 A CN201110417380 A CN 201110417380A CN 102492129 A CN102492129 A CN 102492129A
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- acetaldehyde
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Abstract
The invention relates to a method for reducing content of acetaldehyde in granulated polyester slice. The method comprises the steps of: cooling a polycondensation reactant, which is prepared by performing esterification and polycondensation to materials, with cooling water and then sized-dicing the polycondensation reactant to acquire a slice; the method is characterized by adding bicarbonate to the cooling water, wherein the bicarbonate is sodium bicarbonate, potassium bicarbonate, magnesium bicarbonate, calcium bicarbonate or ammonium bicarbonate; the added amount of the bicarbonate to the cooling water is 0.1-5% by weight; and the temperature of the cooling water ranges from 35 DEG C to 40 DEG C. The method has the advantages of greatly reducing the content of acetaldehyde in the sized-diced slice, so that the quality of the product is simply and economically improved.
Description
Technical field
The present invention relates to after a kind of reduction pelletizing the working method of acetaldehyde in the PET Resin/Poyester Chips Bottle Grade (comprising polyethylene terephthalate, PTT, polybutylene terephthalate, PEN); This method is used for reducing the acetaldehyde in the section behind the PET Resin/Poyester Chips Bottle Grade Production Flow Chart melt polymerization.Use present method can simple economy ground to improve the quality of products and reduce production costs.
Technical background
Polyester is the general name of divalent alcohol and the diprotic acid copolymerization and the thermoplasticity line style saturated polyester of back generation, mainly comprises polyethylene terephthalate, PTT, polybutylene terephthalate, PEN etc.A polyester particularly important use of polyethylene terephthalate is to be used for the food product pack field.Occupy critical role in social life, be mainly used in the drink and food packing, and extended to fields such as medicine, agricultural chemicals, cosmetic package, wherein the drink and food packing accounts for 80% of bottle level polyester.But polyester is the same with most polymers, because of problems affect such as resistance to air loss, thermal stability, acetaldehyde and production costs further developing of this market.PET both can be made into the two-way stretch packing film during as packaging material for food, can be made into again behind the non-crystalline state bottle base again that blowing makes HS, high transparent stretch blow bottle, and can also directly being extruded into behind the sheet material again, thermoforming makes hollow container.Performances such as that the PET goods have is transparent, oil resistant, the guarantor is fragrant, health is reliable and the use temperature scope is wide, therefore the consumption at packaging field constantly increases.
The production of packaging polyester is divided into: esterification, polycondensation, cooling and dicing make section and solid state polycondensation; At polycondensation process since polymerization temperature up to more than 285 ℃ and the residence time longer, therefore through acetaldehyde in the PET Resin/Poyester Chips Bottle Grade that forms after the dicing machine pelletizing up to 80-100ppm.Higher acetaldehyde can impact refining plant and the technology in the solid-phase tack producing system of cutting into slices follow-up, causes the deterioration of terepthaloyl moietie sprinkling equipment and catalyzed oxidation equipment.Impact for the acetaldehyde in the final finished section simultaneously.Acetaldehyde is a kind of have pungency and volatile gas, in the use of packing articles, can be penetrated into gradually in the pack content, influences the taste of beverages such as pure water, cola, beer.
In the way of known reduction acetaldehyde; Generally take such as Chinese patent CN03131777.4, CN01103833.0 etc. announcement; Through the formula adjustment in the production process as through adding acetaldehyde trapping agent such as phosphoric acid, SULPHOSUCCINIC ACID ESTER, suffocated amine antioxidant; Reduce the acetaldehyde in the PET Resin/Poyester Chips Bottle Grade, this type material is a low molecule organic matter, need add in the middle of the material.After processing goods the risk of moving in the content is arranged in use.
Also has U.S. Pat 4,837; 115,5,340,884 announcements such as grade; These patents are to reduce the acetaldehyde in the goods through in the slice processing process, adding polyamide-based material, because polymeric amide compatible mutually relatively poor with polyester causes the end article transparency to descend.
Can realize containing in the polyester article relatively lower acetaldehyde amount though have some at present, also there is certain shortcoming separately in these methods, on index, also can't satisfy higher performance requriements.
Summary of the invention
The purpose of this invention is to provide after a kind of reduction pelletizing that can improve the quality of products and reduce production costs the method for acetaldehyde in the PET Resin/Poyester Chips Bottle Grade.
Technology contents of the present invention is: a kind ofly reduce after the pelletizing method of acetaldehyde in the PET Resin/Poyester Chips Bottle Grade; Comprise by raw material pelletizing after the polycondensation thing that makes after esterification and the polycondensation is with water quench making section, it is characterized in that in water coolant, adding supercarbonate; Supercarbonate is sodium hydrogencarbonate, saleratus, Magnesium hydrogen carbonate, Calcium hydrogen carbonate or bicarbonate of ammonia; The addition of supercarbonate in water coolant is 0.1～5 weight %; The water temperature of water coolant is 35～40 ℃.
For the effect of acetaldehyde in the PET Resin/Poyester Chips Bottle Grade after the further raising reduction pelletizing, will put into feed bin with the section that pelletizing after the water quench makes and store 24～48 hours.
In the PET Resin/Poyester Chips Bottle Grade in the method for acetaldehyde, the addition of supercarbonate in water coolant is preferably 0.1～1%wt after above-mentioned reduction pelletizing, and optimum addition is 0.3～0.5%wt.
In the production process of PET Resin/Poyester Chips Bottle Grade; After the fused polycondensation thing that makes in the polycondensation is extruded end of extruded band; Cut into slices after forming solid-state material bar through certain temperature and the cooling that contains the water coolant of supercarbonate; In process of cooling, fully adsorb and take away impurity acetaldehyde, and guarantee that moisture content in the section after the pelletizing is between 300～400ppm by water coolant.
The advantage that the present invention had is: the cooling and dicing link of the present invention in the PET Resin/Poyester Chips Bottle Grade production process, and through adjustment water coolant component, thus the purpose of acetaldehyde in cutting into slices after the realization reduction pelletizing; Can reduce the acetaldehyde in the section after the pelletizing behind the present invention greatly, thereby simple economy ground improves the quality of products.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed explanation.
Embodiment 1
Polyethylene terephthalate (PET) production line is the continuous processing production of polyester line of per hour 360 tons of output, and the dicing machine of use is produced for German Rieter Perfojet, and model is VSG600/H.To make the polycondensation thing through esterification and polycondensation respectively by the slurry of terephthalic acid (PTA), terepthaloyl moietie (EG), antimony acetate and toning agent furnishing earlier; The polycondensation thing again after water quench pelletizing must cut into slices; In water coolant, add sodium hydrogencarbonate, the addition of sodium hydrogencarbonate in water coolant is 0.5 weight %; The water temperature of water coolant is 36 ℃; Moisture content is 355ppm in the section after the test pelletizing; Section is put into feed bin and is stored 24 hours, and acetaldehyde is 25ppm (acetaldehyde is tested with reference to the acetaldehyde testing method of stipulating in the GB17931-2003 Bottle grade Polyester Chips national standard) in the section through surveying.
Embodiment 2
Polyethylene terephthalate (PET) production line is the continuous processing production of polyester line of per hour 360 tons of output, and the dicing machine of use is produced for German Rieter Perfojet, and model is VSG600/H.To make the polycondensation thing through esterification and polycondensation respectively by the slurry of terephthalic acid (PTA), terepthaloyl moietie (EG), antimony acetate and toning agent furnishing earlier; The polycondensation thing again after water quench pelletizing must cut into slices; In water coolant, add saleratus, the addition of saleratus in water coolant is 0.5 weight %; The water temperature of water coolant is 38 ℃; Moisture content is 350ppm in the section after the test pelletizing, and section is put into feed bin and stored 36 hours; Acetaldehyde is 21ppm (acetaldehyde is tested with reference to the acetaldehyde testing method of stipulating in the GB17931-2003 Bottle grade Polyester Chips national standard) in the section through surveying.
The comparative example
Polyethylene terephthalate (PET) production line is the continuous processing production of polyester line of per hour 360 tons of output, and the dicing machine of use is produced for German Rieter Perfojet, and model is VSG600/H.To make the polycondensation thing through esterification and polycondensation respectively by the slurry of terephthalic acid (PTA), terepthaloyl moietie (EG), antimony acetate and toning agent furnishing earlier; The polycondensation thing again after water quench pelletizing must cut into slices; Acetaldehyde is 25ppm in the section through surveying; Acetaldehyde is 73ppm (acetaldehyde is tested with reference to the acetaldehyde testing method of stipulating in the GB17931-2003 Bottle grade Polyester Chips national standard) in the section through surveying.
Claims (2)
1. one kind is reduced after the pelletizing method of acetaldehyde in the PET Resin/Poyester Chips Bottle Grade, comprises by raw material pelletizing after the polycondensation thing that makes after esterification and the polycondensation is with water quench making section, it is characterized in that in water coolant, adding supercarbonate; Supercarbonate is sodium hydrogencarbonate, saleratus, Magnesium hydrogen carbonate, Calcium hydrogen carbonate or bicarbonate of ammonia; The addition of supercarbonate in water coolant is 0.1～5 weight %; The water temperature of water coolant is 35～40 ℃.
2. the method for acetaldehyde in the PET Resin/Poyester Chips Bottle Grade after the reduction pelletizing according to claim 1 is characterized in that feed bin is put in the section that makes with pelletizing after the water quench stores 24～48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104173805A CN102492129A (en) | 2011-12-14 | 2011-12-14 | Method for reducing content of acetaldehyde in granulated polyester slice |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104173805A CN102492129A (en) | 2011-12-14 | 2011-12-14 | Method for reducing content of acetaldehyde in granulated polyester slice |
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| CN102492129A true CN102492129A (en) | 2012-06-13 |
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| CN2011104173805A Pending CN102492129A (en) | 2011-12-14 | 2011-12-14 | Method for reducing content of acetaldehyde in granulated polyester slice |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108453931A (en) * | 2017-02-17 | 2018-08-28 | 保利麦特瑞斯公司 | The method and apparatus of direct crystallization for condensation polymer |
| US11566104B2 (en) | 2012-09-26 | 2023-01-31 | Polymetrix Ag | Process and apparatus for direct crystallization of polycondensates |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020136808A1 (en) * | 1999-10-27 | 2002-09-26 | The Coca-Cola Company | Process for reduction of acetaldehyde and oxygen in beverages contained in polyester-based packaging |
| CN1556821A (en) * | 2001-07-31 | 2004-12-22 | 鸟巢水处理技术有限责任公司 | Low intrinsic viscosity and low acetaldehyde content polyester, hollow preforms and containers obtained from said polymer |
| CN101125915A (en) * | 2007-10-10 | 2008-02-20 | 上海康沃生化科技有限公司 | Method for preparing polyethylene terephthalate succinic acid ester copolymers |
| CN101296788A (en) * | 2005-08-26 | 2008-10-29 | 鲁奇齐默尔有限公司 | Method and device for reducing acetaldehyde content in polyester granulate |
-
2011
- 2011-12-14 CN CN2011104173805A patent/CN102492129A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020136808A1 (en) * | 1999-10-27 | 2002-09-26 | The Coca-Cola Company | Process for reduction of acetaldehyde and oxygen in beverages contained in polyester-based packaging |
| CN1556821A (en) * | 2001-07-31 | 2004-12-22 | 鸟巢水处理技术有限责任公司 | Low intrinsic viscosity and low acetaldehyde content polyester, hollow preforms and containers obtained from said polymer |
| CN101296788A (en) * | 2005-08-26 | 2008-10-29 | 鲁奇齐默尔有限公司 | Method and device for reducing acetaldehyde content in polyester granulate |
| CN101125915A (en) * | 2007-10-10 | 2008-02-20 | 上海康沃生化科技有限公司 | Method for preparing polyethylene terephthalate succinic acid ester copolymers |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11566104B2 (en) | 2012-09-26 | 2023-01-31 | Polymetrix Ag | Process and apparatus for direct crystallization of polycondensates |
| CN108453931A (en) * | 2017-02-17 | 2018-08-28 | 保利麦特瑞斯公司 | The method and apparatus of direct crystallization for condensation polymer |
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Application publication date: 20120613 |