2 results about "Chlorosulfonic acid" patented technology

The invention discloses a method for preparing magnesium sulfate from byproduct sulfuric acid of benzene sulfone chloride. The method comprises the following steps: (1) sulfonation reaction: chlorosulfonic acid and pure benzene are taken as raw materials; firstly, the chlorosulfonic acid is added into a reaction kettle; then, the reaction kettle is heated, and the reaction kettle is started; afterstarting, under the stirring state that the stirring rate is 100-150r / min, the pure benzene is dropwise added by employing a constant-pressure dropping funnel; and after being dropwise added, the pure benzene and the chlorosulfonic acid react for 2-3h to produce hydrogen chloride gas; then the produced hydrogen chloride gas is condensed and is absorbed by a secondary falling film to prepare a hydrochloric acid solution with mass concentration of 38%-45%; after the solution is obtained, 10-15g of sulfonation additive is added into the solution; then the reaction kettle is restarted for reaction; and after the reaction ends, cooling, hydrolyzing, crystallization, suction filtration, water washing and drying are performed to obtain the benzene sulfone chloride and by-products thereof; the sulfuric acid can be separated very conveniently, and the magnesium sulfate can be quickly prepared by using the sulfuric acid.