Alkylbenzene sulphonates belong to the group of anionic surfactants. They are formed by sulfonation of alkylbenzene, usually containing a linear chain of 10-13 carbon atoms. As a result, alkylbenzene sulphonic acid (ABS acid) is obtained. In the next stage, it is neutralized with sodium hydroxide, which results in obtaining alkylbenzene sulphonic acid sodium salt. The sulfonating agent may be oleum i.e. a mixture of sulphuric acid and sulphur trioxide, sulphur trioxide gas, or chlorosulphonic acid.