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High-viscosity copolyester production system and method with mixed alcohol separation and recovery functions

A separation recovery and production system technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as high reaction temperature, achieve high removal efficiency, flexible adjustment, and reduce production costs

Active Publication Date: 2022-02-08
JIANGSU HONGGANG PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the conventional copolyester production process is generally set as a five-pot process. In the reaction process, the reaction temperature of each reactor, especially the polycondensation tank, is high, and quality problems such as product viscosity and color value are prone to occur.

Method used

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  • High-viscosity copolyester production system and method with mixed alcohol separation and recovery functions
  • High-viscosity copolyester production system and method with mixed alcohol separation and recovery functions
  • High-viscosity copolyester production system and method with mixed alcohol separation and recovery functions

Examples

Experimental program
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Effect test

Embodiment 1

[0063]On the high-viscosity copolyester continuous production line, put PTA / EG in a molar ratio of 1:1.1 and a certain proportion of toner into the slurry preparation tank 1. After the slurry is mixed, the material is sent to the first esterification In kettle 2, under the conditions of reaction temperature 249°C and pressure 60Kpa (A), the esterification rate is controlled to be higher than 90%. The esterified product is sent to the second esterification kettle 4, and the third monomer isophthalic acid (IPA) enters the second monomer through the material addition system 5 at 23.6% mol (amount relative to PTA) and a certain proportion of catalyst and heat stabilizer. In the esterification kettle 4, the esterification reaction is further carried out under slight positive pressure, a slightly higher temperature than the first esterification kettle, and stirring. After the esterification rate reaches 97%, it enters the first precondensation kettle 20. At a reaction temperature of ...

Embodiment 2

[0065] On the high-viscosity copolyester continuous production line, put PTA / EG in a molar ratio of 1:1.1 and a certain proportion of toner into the slurry preparation tank 1. After the slurry is mixed, the material is sent to the first esterification In kettle 2, under the conditions of reaction temperature 255°C and pressure 68Kpa (A), the esterification rate reaches 90%. The esterified product is sent to the second esterification kettle 4, and the third monomer 1,4-cyclohexanedimethanol (CHDM) is added at 3.31% mol (amount relative to PTA) and a certain proportion of catalyst and heat stabilizer through the material System 5 enters the second esterification tank 4, and undergoes further esterification reaction under slightly positive pressure, a slightly higher temperature than the first esterification tank and stirring, and the esterification rate reaches 98%. The esterified product enters the first pre-condensation tank 20, and the polycondensation reaction occurs at a re...

Embodiment 3

[0067] On the high-viscosity copolyester continuous production line, put PTA / EG in a molar ratio of 1:1.1 and a certain proportion of toner into the slurry preparation tank 1. After the slurry is mixed, the material is sent to the first esterification In kettle 2, under the conditions of reaction temperature 254°C and pressure 85Kpa (A), the esterification rate reaches 90%. The esterified product is sent to the second esterification tank 4, and the third monomer 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) is 5.87% mol (amount relative to PTA) and A certain proportion of catalysts and heat stabilizers enter the second esterification kettle 4 through the material addition system 5, and undergo further esterification reaction under slightly positive pressure, a slightly higher temperature than the first esterification kettle and stirring, and the esterification rate reaches 97%. . The esterified product enters the first pre-condensation tank 20, and polycondensation reaction ...

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Abstract

The invention discloses a high-viscosity copolyester production system and method with mixed alcohol separation and recovery functions, and the system comprises a slurry blending tank, a first esterification kettle, a second esterification kettle, a rectification process tower, a first pre-polycondensation kettle, a second pre-polycondensation kettle, a final polycondensation kettle, a high-viscosity kettle, a pelletizing system and a pelletizing collection bin. A mixed alcohol vacuum rectification system is arranged between the rectification process tower and the slurry blending tank, and the mixed alcohol vacuum rectification system comprises a mixed alcohol collecting tank, a vacuum refining tank, an EG waste liquid collecting tank, an EG vacuum refining tower, a refined EG collecting tank and a condensate collecting tank. According to the system and the method disclosed by the invention, the high-viscosity kettle, the double-scraper condenser, the double-atmospheric-leg pipeline, the independent material adding system and the mixed alcohol vacuum distillation system are arranged, so that a six-kettle low-temperature long-flow process flow is formed, the reaction process is high in efficiency and good in controllability, the recovery purity of EG is high, the unit consumption of raw materials is low, the product viscosity is high, and the quality is continuous and stable.

Description

technical field [0001] The invention relates to a high-viscosity copolyester production device, in particular to a high-viscosity copolyester production system and method with the function of separating and recovering mixed alcohols. Background technique [0002] Ordinary polyester is generally produced by esterification and polycondensation of terephthalic acid (PTA) and ethylene glycol (EG), and is a crystalline polymer. The production of copolyester is to introduce the third or even the fourth monomer to participate in the copolymerization in addition to the two main components of dibasic acid and diol during the polymerization process, in order to form an asymmetric molecular structure. Amorphous non-crystalline copolymer. This kind of amorphous copolyester has excellent chemical corrosion resistance, impact resistance and environmental protection performance. Its products are highly transparent and have excellent processing and forming properties. It can be made into p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00C07C29/80C07C31/20
CPCB01J19/0006C07C29/80C07C31/202
Inventor 边树昌郑晓明张新忠
Owner JIANGSU HONGGANG PETROCHEMICAL CO LTD
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