SULFAMIC ACID Manufacture

SULFAMIC ACID

Molecular Formula

NH₂SO₃H

Manufacturing Method

Polymeric compounds with unsaturated bonds (such as polystyrene sulfonic acid) obtained through free radical polymerization using unsaturated monomers with sulfonic groups are then introduced into the polymer compound using the following method (hereinafter referred to as sulfonation). The sulfonation reaction method can be: for example, adding reaction solvents (1,2-dichloroethane, dichloromethane, chloroethane, carbon tetrachloride, 1,1-dichloroethane, 1,1,2,3-tetrachloroethane, chloroform, and 1,2-dibromoethane, which are inert solvents for sulfonation), sulfonation agents (anhydrous sulfuric acid, chlorosulfonic acid, etc.), and then reacting them at 0-50 ° C, filtering or distillation as necessary to remove the solvent, Obtain polymer compounds with sulfonic acid groups introduced.

Compared to the number of moles of unsaturated monomers that make up polymer compounds, the optimal dosage (molar ratio) of sulfonating agent at this time is 0 5-3, more preferably 1-2.5. The amount of solvent used (weight%) is also determined by the molecular weight of the polymer compound, which is usually 1-30 compared to the raw polymer compound, preferably 2-20.

From the perspective of solubility in water, the sulfonation rate (molar percentage) of each constituent monomer unit of the obtained polymer compound is preferably 50-100, and more preferably 80-99. In addition, sulfonation rate is an indicator indicating how many sulfonic groups are introduced into each constituent unit of a polymer compound