Patent ID: 8623319

Claim:
A process for directly producing sulfur trioxide and sulfuric acid using gypsum as raw material, wherein sulfur trioxide in gypsum is directly replaced with silica dioxide through thermal activation or light quantum activation under the assistance of catalytic activation, while restraining reducing atmosphere and removing the resultant sulfur trioxide in time, wherein the chemical reactions that occur comprise, CaSO 4 +M+SiO 2 M+CaSiO 3 /M.CaSiO 3 + CaSO 4 .2H 2 O+M+SiO 2 +a H 2 O M+CaSiO 3 .b H 2 O/M.CaSiO 3 .b H 2 O+SO 3 /H 2 SO 4 wherein M is the catalytic activator, and a and b prefixed to H 2 O are 1, 2 or 3; then the resultant sulfur trioxide is used as raw material to produce sulfuric acid by well-known methods in the art.