Sulfierungen mit Schwefeltrioxid

Abstract

After a brief discussion of the advantages and disadvantages of the sulfonation process using gaseous sulfur trioxide it is attempted to determine the limits of the industrial application of this method. Economical use of this sulfonation method implies a continuous production of one or only a few products of high output with chemically clear reactions.
Further, some classes of chemical compounds are discussed for which the sulfonation process using gaseous sulfur trioxide is not so common in industrial practice.
Regarding unsaturated carboxylic acids and their esters a practicable method to get surface active compounds by means of gaseous sulfur trioxide is given, whereas when sulfonating unsaturated oxycarboxylic-acid esters, some difficulties were encountered. A further investigation concerns α-olefines and naphthalene, the latter being transferred to water-free 1-naphthalene-sulfonic acid.