Recovery method of usable substances in terephthalic acid industrial residues

Abstract

The invention discloses a recycling method of available substances in a terephthalic acid industrial residue, wherein the recycling method comprises the steps: 1) taking the PTA residue, adding an activated alumina auxiliary agent, heating, successively collecting a gasification product A (namely a mixture of benzoic acid and p-toluylic acid), a gasification product B (namely a mixture of o-phthalic acid and m-phthalic acid) and a gasification product C (namely terephthalic acid); taking the gasification product A, mixing with imidazole and a derivative thereof, taking deionized water as a solvent and zinc chloride as a catalyst, keeping constant temperature at the temperature of 100 DEG C for 1.0-1.5 hours, and thus obtaining a benzoic acid insoluble solid and a solution containing p-toluylic acid and imidazole or the derivative thereof; and mixing the gasification product B with a hydroxide, adding deionized water, keeping constant temperature at the temperature of 90 DEG C for 1.0-1.5 hours, filtering, to obtain a o-phthalate solution and a m-phthalate insoluble solid, filtering, then respectively acidifying to the pH value of 1.0, and precipitating to obtain o-phthalic acid and m-phthalic acid. The by-products in the residue are effectively separated, and secondary pollution is avoided from being caused.

Description

technical field [0001] The invention relates to a method for treating residues of chemical products, in particular to a method for recovering available substances in terephthalic acid industrial residues (PTA). Background technique [0002] Regarding the treatment of PTA residues, most of the enterprises or published treatment methods currently use incineration, partial recycling and relatively sufficient recycling. [0003] (1) Using incineration method [0004] Shen Fuchang applied for "PTA residue treatment method" (application number: 99114298.5) and "purified terephthalic acid (PTA) residue incineration method" (application number: 01134015.0). Crushing, screening, blast injection, combustion and exhaust gas treatment. Liu Meng applied for "A Method for Resource Utilization of PTA Residues with High Moisture Content" (Application No.: 201310106761.0). This method grinds, grinds and classifies PTA residues with high moisture content. Moisture content PTA residue powde...

AI Technical Summary

Problems solved by technology

At present, domestic treatment methods such as incineration, extraction or distillation are mainly used. Although these methods have solved the pollution problem of PTA residues to a certain extent, they have not effectively utilized the by-products in PTA residues on the whole, and they are easy to cause certain pollution. degree of secondary pollution

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