Process for scrubbing hydrogen chloride from waste gases and selective recovery of anhydrous magnesium chloride
Abstract
Abstract HOT WASTE GASES CONTAINING SMALL AMOUNTS OF HYDROGEN CHLORIDE PLUS ADDITIONAL COMBUSTION PRODUCTS INCLUDING CARBON DIOXIDE, NITROGEN, OXYGEN AND WATER VAPOR ARE SCRUBBED SUBSTANTIALLY FREE OF THE HYDROGEN CHLORIDE BY CONTACTING THE HOT GASES WITH A FLUID SCRUBBING MEDIUM COMPRISING A SLURRY OF OOLITIC SAND AND CLACIUM CHLORIDE BRINE AT A PH LES THAN 7, WHEREBY THE HYDROGEN CHLORIDE IN THE GASES IS CONVERTED TO ADDITIONAL CALCIUM CHLORIDW BRINE WHICH IS SEPARATED AND RECOVERED FROM THE FLUID SCRUBBING MEDIUM, THE LATTER BEING FORIFIED BY A MINOR PORTION OF THE RECOVERED BRINE AND RECYCLED TO SCRUB ADITIONAL HOT WASTE GASES. THE SYSTEM EMPLOYED COMPRISES A SCRUB TOWER IN WHICH THE FLUID SCRUBBING MEDIUM AND HOT WASTE GASES ARE BROUGHT INTO INTIMATE CONTACT, PREFERABLY BY COUNTERCURRENT FLOW, AD SUITABLE MEANS FOR SEPARATING AND RECOVERING THE NEWLY FORMED CALCIUM CHLORIDE BRINE FROM THE FLUID SCRUBBING MEDIUM INCLUDING MEANS FOR RECOVERING THE OOLITIC SAND AND MIXING IT WITH MAKE-UP BRINE TO FORM FRESH FLUID SCRUBBING MEDIUM WHICH IS RECYCLED TO THE SCRUB TOWER.
Inventors
- 👤 W Mccormick
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