Green and energy-saving method for treating VOCs gas of synthetic rubber drying unit and purification system

Abstract

The invention relates to a green and energy-saving method for treating VOCs gas of a synthetic rubber drying unit, and belongs to the technical field of gas treatment in the rubber industry. Tail gasof the synthetic rubber drying unit is conveyed to a first heat exchanger in a pressurized mode, exchanges heat with up-to-standard tail gas and enters a condensed water collecting tank to be subjected to moisture separation after being cooled. The tail gas enters a packed bed of a rotary drum in a supergravity absorber together with absorption liquid through a gas inflow pipe; and under the action of supergravity, the absorption liquid forms a molecular-level film to capture and absorb organic volatile components in the tail gas; after being treated by the supergravity absorber, residual VOCsare adsorbed to form up-to-standard tail gas; at least part of the up-to-standard tail gas is recycled. By coupling absorption and adsorption processes, the up-to-standard emission and recycling of the tail gas can be realized.

Description

technical field [0001] The invention relates to a method and a purification system for green and energy-saving treatment of VOCs gas in a synthetic rubber drying unit, belonging to the technical field of gas treatment in the rubber industry. Background technique [0002] In the process of rubber synthesis by solution method, volatile organic waste gas will be produced during the rubber drying process. This VOCs will pollute the air and affect human health. [0003] Solution synthetic rubber, such as butadiene rubber, ethylene-propylene rubber, solution-polymerized styrene-butadiene rubber, halogenated butyl rubber, thermoplastic elastomer, etc., generally use pentane, hexane, heptane, octane or mixtures as solvents in the rubber production process After the polymerization reaction, most of the solvent and unreacted monomers are removed through the coagulation process, and then sent to the rubber post-processing unit for extrusion, dehydration, drying, and briquetting for sal...

AI Technical Summary

Problems solved by technology

However, for the post-treatment tail gas commonly used in the synthetic rubber industry, because of its large air volume, low concentration, and high temperature, the general absorption method is directly used for treatment, which has the disadvantages of large absorption equipment, high pressure drop, and low utilization of exhaust heat. , Exhaust gas after absorption is not easy to meet the standard and other problems

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