| http://www.w3.org/ns/prov#value | - If desired, the reaction can also be carried out in a solvent, e.g., a hydrocarbon, such as benzene and toluene, or in an alcohol, sauch as ethanol. 3,502,708 Patented -Ma.r. 24, 1970 When, after a few minutes, the rapid reaction has stopped, the excess hydrogen sulphide can then be removed by evaporation.
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