Highly active calcium-based powdered desulfurizer and method for its production

By constructing an organic-inorganic hybrid interface layer on the surface of calcium-based powdered desulfurizer and utilizing a complex system of aminosilane coupling agent and organic carboxylic acid, the problems of ineffective consumption and low calcium utilization caused by CO2 competitive reaction of calcium-based desulfurizer are solved, realizing efficient desulfurization in CO2 environment and resource utilization of by-products.

CN121891917BActive Publication Date: 2026-06-26LIANYUNGANG XINJIANG ENVIRONMENTAL MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LIANYUNGANG XINJIANG ENVIRONMENTAL MATERIAL CO LTD
Filing Date
2026-03-25
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing calcium-based desulfurizers suffer from ineffective consumption and low calcium utilization due to competitive reactions with high concentrations of CO2, and desulfurization byproducts are difficult to utilize as resources.

Method used

An organic-inorganic hybrid interface layer with preferential SO2 recognition function was constructed on the surface of calcium-based powdered desulfurizer by using an aminosilane coupling agent and an organic carboxylic acid complex system. The aminosilane coupling agent forms Si-O-Ca covalent bonds with the Ca(OH)2 surface, and the carboxyl groups of the organic carboxylic acid coordinate with calcium ions to enhance the stability and selectivity of the modified layer, reduce the electrostatic attraction of CO2, and promote SO2 capture.

Benefits of technology

It maintains high efficiency in desulfurization of CO2-containing flue gas, inhibits the ineffective consumption of desulfurizing agents by CO2, improves calcium utilization, and makes calcium sulfate the main desulfurization byproduct, which is easy to utilize as a resource.

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Abstract

The present application relates to the technical field of flue gas pollution prevention and control, and discloses a high-activity calcium-based powdery desulfurizer and a preparation method thereof, aiming to solve the problems of invalid consumption, low calcium utilization rate and difficulty in resource utilization of desulfurization by-products of the existing calcium-based desulfurizer caused by high-concentration CO2 competition reaction, the modifier of amino silane coupling agent and organic carboxylic acid is used to build an interface layer with SO2 selective recognition function on the surface of quicklime, the effective repulsion of CO2 and the preferential adsorption of SO2 are realized by using the anchoring and screening effect of amino and the electronic regulation and capture effect of carboxyl; the pre-complexation, pressurized digestion and heat treatment activation processes are combined to strengthen the thermal stability of the modification layer while maintaining the high specific surface area, the prepared desulfurizer can stably desulfurize in the wide temperature range of 30-350 DEG C, the competition consumption of CO2 is inhibited, the calcium utilization rate is improved, and the desulfurization by-products are mainly calcium sulfate, which can be directly resourceized.
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Citation Information

Patent Citations

  • CN117602852A

  • CN116808798A

  • CN118179224A