Method for producing mixed aromatic dioctyl phthalate
A production method and technology of dicarboxylic acid, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve problems such as failure to achieve copolymerization, reduce separation costs, avoid product quality problems, and improve performance. Effect
Active Publication Date: 2013-07-03
YISHENG DAHUA PETROCHEM
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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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Embodiment 1
[0036] 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, and 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, and each stream 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:
[0037]
[0038] Under the above conditions, the indicators of the slurry output from the oxidation reactor 100 are listed in Table 3.
[0039]
[0040] Note: PX—terephthalic acid, MX—isophthalic acid; 3-CBA—3-carboxybenzaldehyde, 4-CBA—4-carboxybenzaldehyde.
[0041]
[0042] Under the above conditions, the indicators of the slurry output from the oxidation reactor 200 are listed in Table...
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Abstract
The invention relates to a method for producing mixed aromatic dioctyl phthalate, particularly to a method for producing mixed aromatic dicarboxylic acid through cooxidation of mixed xylenes, and belongs to the field of production of aromatic carboxylic acid. In the production process of a polyester chip, PTA (purified terephthalic acid) and PIA (isophthalic acid) at a certain ration are prepared, the addition of the PIA is to improve the flexibility and the degree of crosslinking of the polyester chip while a serious process problem existing in the current polyester production process is that the PTA and the PIA are hardly mixed very uniformly. However, when PX (p-xylene) and MX (m-xylene) are used to produce mixed carboxylic acid through a cooxidation method, the PTA and the PIA obtained are generated simultaneously in the oxidation reaction, molecules of different types in mixed components form a perfect crystal form according to a fixed order and are highly dispersed and fully mixed, so that the quality problem of a product brought about by the uneven mixing of the PTA and the PIA is effectively avoided. The mixed aromatic dioctyl phthalate produced through the method in the invention can form an ideal high polymer copolymerization configuration when polymerized with ethylene glycol in the polyester process, so that the performance of the polyester chip is improved.
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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IPC IPC(8): C07C63/15C07C51/265
CPCY02P20/10
Inventor 杨生东周海平张春阳王丽军李希
Owner YISHENG DAHUA PETROCHEM