Novel method for manufacturing PIA

A technology of refined isophthalic acid and isophthalic acid, which is applied in the preparation of carboxylate salts, chemical instruments and methods, and the preparation of organic compounds, to achieve the effects of reducing raw material consumption, reducing energy consumption, and improving product quality

Inactive Publication Date: 2014-11-26
周向进
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the later stage of the oxidation reaction, water is used as an auxiliary solvent

Method used

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Embodiment Construction

[0154] In order to achieve the purpose of the present invention, a plug flow or plug flow oxidation reactor or an oxidation reactor area is constructed, so that the reaction material liquid phase organic raw material phase forms an upstream and downstream relationship, and the final oxidation reaction target product isophthalic acid is effectively mixed with the raw material. The m-xylene is separated from the intermediate products m-methylbenzaldehyde, m-toluic acid, and 3-CBA, and an oxidation reactor with a special structure and a combination of oxidation reactors with multiple reactors in series can be used.

[0155] 1. Oxidation reactor structure and oxidation reactor combination:

[0156] ①. Oxidation reactor with inner and outer chamber structure.

[0157] The oxidation reaction adopts an oxidation reactor with inner and outer chamber structures. The inner and outer chambers are separated by a built-in cylinder that is coaxial with the oxidation reactor, and the bottom...

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Abstract

Disclosed is a process for producing purified isophthalic acid, which employs new stepwise meta-xylene oxidation technology to make the intermediate product, crude isophthalic acid produced by oxidation not contain two purities of 3-carboxybenzaldehyde (3-CBA) and 3-methyl benzoic acid (meta-methyl benzoic acid), so that the factory processing operation of "purification" can be omitted. The quality of the purified purified isophthalic acid (PPIA) product produced by the present process is much better than that of purified isophthalic acid (PIA), and is more suitable to be used as the polymer raw material of food packaging material, beverage bottle material, medicament packaging material and medical appliance since the content of formaldehyde group thereof is extremely low and it has the advantages of being safer and having no poison.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and is a new manufacturing method of petrochemical products. Background technique [0002] Purified isophthalic acid (PIA), which means high-purity isophthalic acid. The purified isophthalic acid product is a polyester raw material. Polyethylene isophthalate obtained by esterification and polycondensation of purified isophthalic acid and ethylene glycol is a low-melting polyester with a melting point of 65°C. Purified isophthalic acid can be mixed with purified terephthalic acid (PTA) with glycol esterification and polycondensation to produce polyester resins for bottles. Purified isophthalic acid (PIA) and purified terephthalic acid (PTA) are mixed in different proportions, and then esterified and polycondensed with ethylene glycol to obtain low-melting polyester resins with different melting points. The melting point of polyethylene phthalate obtained by mixing purified isophthalic acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C63/24C07C51/265C07C51/43
CPCC07C51/265
Inventor 周向进
Owner 周向进
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