Waste sulfuric acid treatment method and device

By employing pretreatment, fine filtration, and adsorption desalination methods, the problems of long and costly waste sulfuric acid treatment processes in alkylation units have been solved. This has enabled efficient and low-cost sulfuric acid regeneration and recycling, simplified the operation process, and reduced solid waste and exhaust emissions.

CN121800350APending Publication Date: 2026-04-07SINOPEC GUANGZHOU ENG CO LTD
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Patent Information

Application Number
CN202511946057.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-22
Publication Date
2026-04-07

AI Technical Summary

Technical Problem

Existing technologies for treating waste sulfuric acid from alkylation units involve long processes, high costs, and complexities, and are not conducive to the recycling of regenerated sulfuric acid. They also result in solid waste and exhaust gas emissions.

Method used

By employing pretreatment, fine filtration, adsorption desalination, and membrane separation, mechanical impurities, organic polymer oils, and dissolved salts are removed through a sintered filter cartridge filter, a fine filter coalescer, an adsorption tank, and a membrane separator, ultimately yielding high-concentration concentrated sulfuric acid.

Benefits of technology

The process was simplified, engineering investment and operating costs were reduced, efficient impurity removal was achieved, solid waste and exhaust gas emissions were reduced, and the production needs of the alkylation unit were met.

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Abstract

The invention discloses a waste sulfuric acid treatment method and device, the device comprises a sintered filter element filter, a fine filtration coalescer, an adsorption tank and a membrane separator which are connected in sequence, and the fine filtration coalescer adopts a ceramic membrane tube or a polytetrafluoroethylene membrane tube or a silicon carbide lining membrane tube as a filter material; an adsorption material in the adsorption tank is one or a combined adsorption material of more than two of activated carbon, a modified molecular sieve, a metal organic framework material and a nano adsorption material; and the membrane separation system adopts one or a combined membrane of more than two of an ultrafiltration membrane, a reverse osmosis membrane and an electrodialysis membrane. The alkylation waste acid regeneration process can be simplified, the occupied area of the device is saved, the engineering investment is reduced, and the operation cost is greatly reduced compared with that of an existing process technology; according to the method, a physical separation means is adopted, organic polymeric oil, dissolved organic matters, dissolved salts and other impurities in the alkylated waste sulfuric acid can be effectively removed without decomposing and reconstructing the waste sulfuric acid, and the concentrated sulfuric acid after concentration completely meets the production requirements of an alkylation device.
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