Process for recovering sulfur dioxide from a gas containing same

Abstract

Abstract PROCESS FOR THE DECOMPOSITION OF A METAL BISULFITE WHICH IS A PRESURSOR OF SO2 TO REGENERATE SO2, ESPECIALLY FOR USE IN A SYSTEM INVOLVING REACTION BETWEEN SO2 IN A GAS WITH A SULFITE TO PRODUCE THE CORRESPONDING BISULFITE. EXAMPLES OF SULFITES INCLUDE POTASSIUM, CESIUM, AND RUBIDIUM SULFITES. IN THE PROCESS, BISULFITE CRYSTALS ARE SEPARATED FROM A SOLUTION CONTAINING THE SAME AND SO2 PARTIAL PRESSURE LOWERING MATERIALS AND SUBSEQUENTLY PLACED IN EITHER SOLUTION OR SLURRY FORM AND PASSED INTO A DECOMPOSITION ZONE WHEREIN THE BISULFITE IS HEATED TO DRIVE THE SO2 OUT OF THE SOLUTION CONVERTING THE BISULFITE TO THE SULFITE WHICH CAN BE RECYCLED TO ABSORB ADDITIONAL SO2, THE CONCENTRATION OF BISULFITE IN THE SOLUTION FED TO THE DECOMPOSITION ZONE IS DESIRABLY MAINTAINED ABOVE 35 TO 50%, AND PREFERABLY HIGHER, AND THE OPERATING CONDITIONS OF THE DECOMPOSITION ZONE ARE CONTROLLED TO PROVIDE A HIGH PARTIAL PRESSURE OF SULFUR DIOXIDE IN THE SOLUTION AND AN INERT GAS IS ADVANTAGEOUSLY EMPLOYED WHEREBY HIGH CONVERSIONS OF BISULFITE TO SULFITE CAN BE OBTAINED.

Inventors

• 👤 Jack D Terrana
• 👤 Leo A Miller

Bibliographic Details