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Production method of mixed fragrant dioctyl phthalate

A production method and technology of dicarboxylic acid, which are applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carboxylic acid compounds, etc., can solve problems such as failure to achieve copolymerization, reduce separation costs, improve performance, and increase market. The effect of competitiveness

Inactive Publication Date: 2012-07-18
YISHENG DAHUA PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyester production method using PTA and PIA pure materials blended as raw materials, because PTA and PIA are often not fully mixed, the resulting polyester polymer products are often ethylene terephthalate and ethyl isophthalate Simple mixing of diester polymers without going to the point of copolymerization

Method used

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  • Production method of mixed fragrant dioctyl phthalate
  • Production method of mixed fragrant dioctyl phthalate
  • Production method of mixed fragrant dioctyl phthalate

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Embodiment 1

[0038] The method and equipment provided by the present invention are used to carry out the mixed aromatic dicarboxylic acid process and device design with an annual output of 600,000 tons. The annual production time is 7600 hours. The process conditions of each unit equipment are determined according to the principle of material consumption and energy consumption minimization. The energy matching among them is optimized according to the principle of system energy integration. Gained relevant process parameters are listed as follows according to the unit order:

[0039]

[0040] Under the above conditions, the indicators of the oxidation reactor output slurry are listed in Table 2.

[0041]

[0042] Note: PX—terephthalic acid, MX—isophthalic acid; 3-CBA—3-carboxybenzaldehyde, 4-CBA—4-carboxybenzaldehyde.

[0043]

[0044]

[0045]

[0046]

[0047] Through the hydrogenation reactor, the indicators of the output slurry are listed in Table 8.

[0048]

[00...

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Abstract

The invention discloses a production method and a device for preparing mixed fragrant dioctyl phthalate by taking mixed xylene as a raw material and through liquid-phase catalytic oxidation. The raw material is derived from products produced after the extract of C8 aromatic hydrocarbon is separated, or is prepared through paraxylene with higher purity (99 percent) and meta-xylene according to fixed proportion. The mixed xylene is positioned in a gas-liquid agitation reactor with higher temperature and higher pressure, and is directly oxidized by air under the condition of solvent and catalyst, so as to produce mixed fragrant carboxylic acid. The oxidation product is separated by hydrofining and multi-stage low temperature crystallization, so that a high purity mixed product only containing TA (terephthalic acid) and IA (m-phthalic acid) is obtained. The product can be used for polyester production directly, and separation is no longer required. In the mixed carboxylic acid produced by using the technology, TA and IA are in a molecular level high dispersion state, and the mixed carboxylic acid is used for producing polyester, so that the problems of quality instability of the polyester product and the like caused by uneven raw material mixing can be effectively reduced.

Description

technical field [0001] The invention relates to a method for producing mixed aromatic dicarboxylic acids, in particular to a method for producing mixed aromatic dicarboxylic acids through co-oxidation of mixed xylenes, which belongs to the field of aromatic carboxylic acid production. Background technique [0002] Aromatic carboxylic acids are important organic compounds and raw materials for the production of various chemical products, among which purified terephthalic acid (PTA) is the most demanded in the market, which is used in the production of polyester, and the world's terephthalic acid (TA) The output has reached 40 million tons / year; followed by isophthalic acid (PIA), which is used for polyester chips, with an output of 1-2 million tons / year. The production methods of PTA and PIA are very similar. They are both produced by the liquid-phase air oxidation of xylene. Terephthalic acid is obtained from the oxidation of p-xylene (PX), and isophthalic acid is obtained f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C63/24C07C63/26C07C51/265C07C51/487C07C51/43
CPCY02P20/10
Inventor 杨生东周海平张春阳王丽军李希
Owner YISHENG DAHUA PETROCHEM
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