Sulfonation and Sulfation Processes
ether sulfates, dyes and dye intermediates. Figure 6 shows a typical reaction. Note that as the reaction moves to completion, hydrochloric acid (HCl) is released. This acid must be scrubbed or otherwise recovered. Chlorosulfuric acid is an expensive source of SO3 although it is approximately one half the cost of sulfamic acid. The cost per pound of