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Improved method of crystallization of pure terephthalic acid

A terephthalic acid and crude terephthalic acid technology, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as energy recovery and PTA production process blockage

Inactive Publication Date: 2006-09-20
INVISTA TECHNOLOG IES S A R L
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Problems solved by technology

However, this method does not completely solve the problem
[0008] Therefore, an object of the present invention is to provide a method capable of obtaining high-purity PTA crystals with a suitable particle size for the downstream polymerization process, and overcomes the problems of energy recovery and blockage in the PTA production process

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  • Improved method of crystallization of pure terephthalic acid

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[0025] CTA crystallization is mixed with a water flow (line 2) through pipeline 1, and the slurry obtained is pumped into hydrogenation reactor 5 through pipeline 3 in the range of 5100 barg, where the CTA aqueous solution is hydrogenated to remove impurities in at least a part of CTA, And thus form the PTA aqueous stream 6, whose temperature and pressure are reduced through a series of crystallization stages as shown in 7, 10, 13, 16 and 19 and form PTA crystals in the water slurry 8.

[0026] The CTA slurry stream 3 is heated by a variety of means, a single heat exchanger 4 is shown, but it may include multiple heat exchangers heated with steam or liquid streams supplied by the utility or generated from streams from other parts of the terephthalic acid process. heat exchanger. In addition, heating may also include injecting steam and / or liquid directly into the CTA slurry stream 3, using the steam and liquid from the aforementioned channels.

[0027] in such as figure 1 In t...

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Abstract

An improved process for preparing crystalline-purity terephthalic acid is disclosed to obtain high-purity PTA crystals whose granularity is suitable for downstream polymerization process.

Description

technical field [0001] The present invention relates to a process for producing purified terephthalic acid, and more particularly, to an improved process for crystallizing and purifying terephthalic acid crystals from aqueous terephthalic acid solutions. Background technique [0002] Pure terephthalic acid (PTA) can be obtained by purification of crude terephthalic acid (CTA), usually from p-xylene in the presence of oxygen and a catalyst in a Obtained by oxidation in the liquid phase. CTA often contains impurities such as catalyst residues, dark compounds, and oxidation by-products of p-xylene, such as benzoic acid, p-toluic acid, trimellitic acid, and, especially, 4-carboxybenzaldehyde (4-CBA). CTA can also be obtained by hydrolysis of polyalkylene terephthalates such as polyvinyl terephthalate. [0003] The purification process generally involves mixing CTA with an aqueous medium to form a CTA slurry at low temperature. The CTA slurry is heated in various ways to disso...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/26C07C51/43
Inventor D·帕克I·T·伍德科克D·R·比克哈姆
Owner INVISTA TECHNOLOG IES S A R L
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