Chlorination with Thionyl chloride The chlorination of alcohols, carboxylic acids or sulfonic acids with Thionyl chloride leads to chlorides, acid chlorides and sulfonyl chlorides, respectively. Manufacturing is carried out either in batch or continuous processes and process gases (HCl and SO2) are recycled in a separate plant. Reaction scheme Strengths - on-site production and captive use of Thionyl chloride - continuous and batch reactions - recycling of HCl and SO2 For specific products please check product groups carboxylic acid derivatives, alkyl-/aryl chlorides and sulfonic acid derivates.