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Contamination Prevention in an Integrated Purified Terephthalic Acid Production and Polyester Polymerization Plant

A technology of ethylene terephthalate and terephthalic acid is applied in the field of purifying terephthalic acid and polymerization equipment, and can solve problems such as inability to use directly, loss of valuable materials, etc.

Inactive Publication Date: 2018-09-18
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This process for producing dry PTA that can be used in PET polymerization plants requires a significant amount of upfront capital costs related to the required facilities, feedstock, and energy requirements of the multi-step process
Furthermore, significant amounts of water are required and large volumes of aqueous waste effluent must be treated and may present disposal problems
Additionally, dissolved PTA and other valuable materials may be lost in the waste effluent
The wet cake of PTA crystals is in pure form after separation from the mother liquor stream rich in p-toluic acid, but cannot be used directly in this wet form

Method used

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  • Contamination Prevention in an Integrated Purified Terephthalic Acid Production and Polyester Polymerization Plant
  • Contamination Prevention in an Integrated Purified Terephthalic Acid Production and Polyester Polymerization Plant
  • Contamination Prevention in an Integrated Purified Terephthalic Acid Production and Polyester Polymerization Plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Flow rate(kg / h)

Embodiment 2

[0059]

[0060]

[0061] The comparative example shows the heat and mass balance of a PET slurry tank when cold PTA is mixed at 40°C with recycled ethylene glycol from the PET plant. This shows that the combined slurry temperature is 67.8°C.

[0062] Example 1 shows a similar heat and mass balance for the PET slurry tank when combining hot PTA filter cake with recycled ethylene glycol in the reslurry tank. The benefit of adding hot PTA is that the temperature of the mixture stream is about 113°C, which demonstrates the benefit of discharging the PTA filter cake directly to the slurry tank reducing the heat load on the esterifier reboiler by 4.4 MW.

[0063] Example 2 shows a similar heat and mass balance for the PET slurry tank when combining hot PTA cake with recycled ethylene glycol in the reslurry tank. In this case, the cooler of the glycol stream has been heated using waste low calorific value heat from the PTA plant, while the rotary filter is operated at a higher...

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Abstract

The invention relates to an integrated system for the preparation of purified terephthalic acid (PTA) and the use of the PTA for the production of poly(ethylene terephthalate) (PET). Advantageously, the integrated system design described herein can minimize the possibility of contamination of the PTA production operation with reactant, catalysts, or impurities from the PET production operation. Methods of using the integrated system for the production of PET are also described.

Description

technical field [0001] The present invention relates to an improved integrated purified terephthalic acid (PTA) and poly(ethylene terephthalate) (PET) polymerization plant. Background technique [0002] Poly(ethylene terephthalate) (PET) resins are widely produced and used, for example, in the form of fibers and in the form of bottle resins. PET is commonly used to produce beverage and food containers, thermoforming applications, textiles, and as an engineering resin. PET is a polymer usually formed from a diol, such as ethylene glycol, and terephthalic acid (or dimethyl terephthalate). [0003] The raw materials for PET production are thus ethylene glycol and phthalic acid. The phthalic acid is typically 100% terephthalic acid for the production of polyester fibers, but may contain up to 5% isophthalic acid for bottle resins. Catalysts and other additives can be added to the process at any point. In the first stage of the process, ethylene glycol and terephthalic acid a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C277/02B29B17/02C07C63/26C08J11/10
CPCC08G63/183C07C51/43C07C63/26
Inventor R.J.奥布里恩A.S.库特R.E.尼特
Owner INVISTA TEXTILES (U K) LTD