20
2025
-
01
The application of waste acid produced in chlorosulfonic acid sulfonation reaction in electrodialysis
Author：
Characteristics of Waste Acid from Chlorosulfonic Acid Sulfonation Reaction
The chlorosulfonic acid sulfonation reaction generates waste acid containing components such as sulfonic acid and sulfuric acid. These was
te acids have the characteristic of strong acidity, and they may also contain small amounts of unreacted chlorosulfonic acid and organic sulfonic acid products. For instance, in the sulfonation reaction of aromatic compounds, in addition to sulfuric acid, the waste acid may also contain the target product, aromatic sulfonic acid, whose concentration varies depending on factors such as the conversion rate of the reaction.
Introduction to Electrodialysis Principle
Electrodialysis is a membrane separation operation that uses the potential difference as the driving force and the selective permeability of ion-exchange membranes to remove or concentrate electrolytes from solutions. It mainly consists of alternating arrangements of cation and anion exchange membranes between positive and negative electrodes to form compartments. Under the action of a direct current electric field, cations migrate towards the cathode, and anions migrate towards the anode.
For example, in the treatment of saline wastewater, cations such as can pass through the cation exchange membrane and move towards the cathode compartment, while anions such as can pass through the anion exchange membrane and move towards the anode compartment, thereby achieving the separation of salt ions.
Application of Waste Acid from Chlorosulfonic Acid Sulfonation Reaction in Electrodialysis
Acid Recovery and Concentration
The acid components such as sulfuric acid in the waste acid can be recovered and concentrated through electrodialysis. During the electrodialysis process, hydrogen ions as cations can pass through the cation exchange membrane and move towards the cathode compartment. This can enrich the acid components in the waste acid in specific compartments, achieving the purpose of acid recovery. For example, through electrodialysis, the concentration of sulfuric acid in the waste acid can be increased from a relatively low initial value to a higher concentration, making it reusable in other chemical processes that require higher acid concentrations, such as acid washing of certain metals.
Impurity Separation
The organic sulfonic acid products and unreacted chlorosulfonic acid and other impurities in the waste acid can be separated from the acid components such as sulfuric acid. Organic sulfonic acid products usually have larger molecules, and their ionic migration characteristics are different from those of sulfate ions. By rationally selecting the operating conditions of electrodialysis, such as voltage and flow rate, the main acid ions such as sulfate ions and impurity ions such as organic sulfonic acids can be enriched in different compartments, thereby achieving separation. For example, for some waste acids containing complex organic sulfonic acid impurities, electrodialysis can effectively remove these impurities and obtain relatively pure sulfuric acid solutions.
Reduction of Wastewater Treatment Difficulty
After separating the acid and impurities in the waste acid, the remaining wastewater components become relatively simple, reducing the difficulty and cost of subsequent wastewater treatment. Because after electrodialysis treatment, acidic substances and some harmful organic sulfonic acids in the wastewater are removed or their concentrations are reduced, making subsequent biological treatment or other physical and chemical treatment methods (such as neutralization, adsorption, etc.) easier. For example, untreated waste acid wastewater may require a large amount of alkali for neutralization, and the resulting sludge is complex in composition. However, after electrodialysis treatment, the amount of alkali required for neutralization is reduced, and the nature of the resulting sludge is relatively simple, making it easier to handle.
Related Products
Homogeneous membrane electrodialysis: A green solution for zero discharge in wastewater treatment
2025-01-22
The application of waste acid produced in chlorosulfonic acid sulfonation reaction in electrodialysis
2025-01-20
Bipolar membrane electrodialysis empowers and protects the purity and quality of amino acid products
2025-01-12
Huanke Environmental Protection Technology
HOTLINE：
Address：Gongye 1st Street, Weicheng District, Weifang City, Shandong Province China
Contact：Zhang Gong
Phone：+86-18865361829
Email：sdhuanke@163.com
Consult
Copyright © 2023 Shandong Huanke Environmental Protection Technology Co., Ltd