Resource utilization system and method for phthalic anhydride production

Abstract

The invention relates to a resource utilization system and method for phthalic anhydride production. The system comprises a production subsystem, a waste gas purification treatment subsystem, a waste residue resource utilization subsystem and a wastewater treatment subsystem; the production subsystem at least comprises a reactor, a switching condenser, a phthalic anhydride refining device and a phthalic anhydride flaking packaging machine which are connected in sequence; the waste gas purification treatment subsystem comprises an air recovery device, an incineration device and a desulfurization device, the air recovery device is used for purifying waste gas generated by the working of the phthalic anhydride flaking packaging machine and then recovering the purified waste gas as part or all of air to be sent into the reactor, the incineration device is used for carrying out incineration treatment on outlet tail gas of the switching condenser and product refining waste gas of the phthalic anhydride refining device, and the desulfurization device is used for removing sulfide generated by incineration of the incineration device; the waste residue resource utilization subsystem is used for resource utilization of benzoic acid, phthalic anhydride and phthalic anhydride residues separated by the phthalic anhydride refining device; and the wastewater treatment subsystem comprises a spray drying device connected with the desulfurization device and is used for treating desulfurization waste liquid of the desulfurization device.

Description

technical field [0001] The invention relates to the technical field of fine chemical production of phthalic anhydride, in particular to a system and method for resource utilization of phthalic anhydride production. Background technique [0002] Phthalic anhydride is the second largest acid anhydride in the world. It is widely used in chemical industry, medicine, electronics, agriculture, paint, fine chemical industry and other industrial sectors. It is an important organic chemical raw material. At present, the production process of phthalic anhydride is mainly o-xylene or industrial naphthalene fixed-bed catalytic oxidation method. With the improvement of catalyst performance and the enlargement of production equipment, the production capacity of a single set of phthalic anhydride is gradually expanded. The three wastes "exhaust gas, waste residue, The amount of waste water has increased further, and the environmental pollution has become more and more serious. [0003] Th...

AI Technical Summary

Problems solved by technology

Direct incineration of phthalic anhydride residues is not only expensive, but also causes a lot of waste of resources. During the incineration process, a large amount of harmful gases such as carbon dioxide, carbon monoxide and a small amount of sulfur dioxide are produced, causing secondary pollution to the environment.

[0005] Wastewater is mainly desulfurization mother liquor. After long-term recycling, the dissolved salt and COD content in the mother liquor is high, which will easily cause the desulfurization system to run unstable and seriously affect the desulfurization efficiency.

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