Method for preparing plasticizer by using purified terephthalic acid (PTA) residue
A plasticizer and residue technology, applied in the field of petrochemical industry, can solve the problems of cumbersome process and high post-processing cost, and achieve the effects of reduced process, high esterification rate and high catalytic activity
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[0030] In this example, the PTA residue is the solid waste generated from the industrial process of oxidizing p-xylene to terephthalic acid, and all other raw materials are commercially available.
[0031] The specific PTA residue of the present invention is Sinopec Corporation.
[0032] After analysis, the drying PTA residue components mainly include 2%-10% mass content of isophthalic acid, 10%-15% mass content of terephthalic acid, 2%-5% mass content of phthalic acid, 30%-40% by mass of benzoic acid, 25%-35% by mass of p-toluic acid, and <5% by mass of ash.
[0033] Add excess 0.5M sodium hydroxide solution to the PTA residue, stir at 40-80°C for 30-60min to completely dissolve the mixed benzoic acid components, cool and filter to recover the metal catalyst; adjust the filtrate to pH<7 with dilute sulfuric acid, mix the benzoic acid The formic acid component is completely precipitated, collected by filtration and dried at 80-90°C to obtain an alkali-dissolved precipitate. ...
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