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Variable pressure drop upstream prepolymer (ufpp) systems and methods

一种预聚合、可变的技术，应用在化学仪器和方法、利用大气压力使物质发生化学变化的方法、使液体与液体反应的化学方法等方向，能够解决技术和方法昂贵等问题

Inactive Publication Date: 2015-12-23
INVISTA TECHNOLOG IES S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009]Currently, the technology and methods used to set up and operate polyethylene terephthalate manufacturing processes are expensive

Method used

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  • Variable pressure drop upstream prepolymer (ufpp) systems and methods
  • Variable pressure drop upstream prepolymer (ufpp) systems and methods
  • Variable pressure drop upstream prepolymer (ufpp) systems and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 2

[0102] SE pressure has been reduced.

[0103] A small increase in COOH from 28.2 to 31.4 has resulted in an increase in HP pressure from 4.0 mbar absolute to 4.6 mbar absolute. This effect indicates a more reactive oligomerization feed composition to HP.

[0104] Example 3

Embodiment 2

[0106] Colors L and B have improved due to the higher HPCOOH and lower iV achieved.

[0107] Example 4

Embodiment 3

[0109] We can consider the data generated in Examples 1-4 graphically as follows: image 3 It was shown that at a decrease in SE pressure (or a decrease in dP, where dP is defined as LP pressure minus SE pressure), we see an increase in HPCOOH.

[0110] Figure 4 It was similarly shown that as the SE pressure decreased from 960 mbar absolute to 350 mbar absolute, the HP pressure increased (increased) and then rapidly decreased to 200 mbar absolute.

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Abstract

Methods and systems for making polyethylene terephthalate (PET) and prepolymers are disclosed. The methods and systems use a variable pressure drop upstream prepolymerizer configuration. The pressure profile in the UFPP can be selected to favorably alter the relative reaction rates of polymerization and esterification. This design maximizes the esterification that takes place in UFPP while still producing a prepolymer with an optimal concentration of carboxyl end groups (e.g., about 30 microequivalents / g to 60 microequivalents / g) for finisher Maximize production capacity. This can lead to a reduction in the size and cost of the esterifier required for a given plant capacity.

Description

field of invention [0001] The present invention relates to methods and systems for preparing polyethylene terephthalate (PET) and prepolymers. More particularly, the present invention relates to variable pressure drop upstream prepolymerizer systems and methods for making PET and prepolymer PET. background [0002] The production process of polyethylene terephthalate for both polyester fibers and bottle resins is carried out wholly or partly in a series of melt phase reactors. Generally, the production process of polyethylene terephthalate may include three melt phase reactors: esterifier, UFPP (upflow prepolymerizer) and finisher. All three reactors are generally operated at temperatures above 270°C while the operating pressure is reduced from superatmospheric pressure in the first reactor (esterifier) ​​to near full vacuum in the final reactor (finisher). The raw materials used in the process are ethylene glycol and phthalic acid. [0003] For polyester fibers, phthali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J3/02B01J19/24C08F2/01C08G63/183
CPCC08G63/785B01J14/00B01J19/006B01J2219/00094B01J2219/00777B01J2219/00162B01J19/24C08G63/181
Inventor C.A.哈米尔顿R.E.尼特
Owner INVISTA TECHNOLOG IES S A R L