公开(公告)号：US3786135A

公开(公告)日：1974-01-15

申请号：US18027671

申请日：1971-09-14

Applicant: ALUMINUM CO OF AMERICA

Inventor： KING L ,  KNAPP L ,  SCHOENER R ,  REMPER J ,  KLOAP N ,  STARNER B

IPC: B01D7/00 ,  B01D7/02 ,  C01F7/00 ,  C01F7/56 ,  C01F7/58 ,  C01F7/60 ,  C01F7/62

CPC classification number: B01D7/02 ,  C01F7/60 ,  C01P2004/03 ,  C01P2004/32 ,  C01P2004/51 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/20 ,  C01P2006/80

Abstract: RECOVERY OF SELECTIVELY CONSTITUTED HIGH PURITY ALUMINUM CHLORIDE FROM THE GASEOUS EFFLUENT OF THE CHLORINATION OF SODIUM CONTAMINATED ALUMINA INCLUDING THE STEPS OF PURIFYING SUCH GASEOUS EFFLUENT TO PROVIDE ESSENTIALLY CONTAMINANT-FREE ALUMINA CHLORIDE IN GASEOUS FORM IN A GASEOUS CARRIER THROUGH SELECTIVELY COOLING THE HOT GASEOUS EFFLUENT TO A FIRST TEMPERATURE RANGE WELL ABOVE THE AMBIENT CONDITION CONDENSATION TEMPERATURE OF ALUMINUM CHLORIDE YET SUFFICIENT TO CONDENSE A SELECTIVE PORTION OF THE CONDENSABLE CONSTITUENTS THEREIN INCLUDING A SUBSTANTIAL PORTION OF THE SODIUM ALUMINUM CHLORIDE VALUES THEREIN WITHIN CONDENSING APPRECIABLE AMOUNTS OF ALUMINUM CHLORIDE, INITIALLY SEPARATING FROM THE COOLED GASEOUS EFFLUENT ENTRAINED PARTICLES AND INITIALLY CONDENSED CONSTITUENTS, FURTHER REDUCING THE TEMPERATURE OF THE RESIDUAL COOLED GASEOUS EFFLUENT FROM THE FIRST STAGE SEPARATION TO A SECOND PREDETERMINED LOWER TEMPERATURE RANGE STILL ABOVE THE CONDENSATION TEMPERATURE OF ALUMINUM CHLORIDE TO EFFECT A FURTHER SELECTIVE CONDENSATION AND SEPARATION OF THE REMAINING CONDENSABLE CONSTITUENTS THEREIN, AND DIRECTLY DESUBLIMING THE ESSENTIALLY CONTAMINANT-FREE GASEOUS ALUMINA CHLORIDE VALUES FROM THE PURIFIED RESIDUAL GASEOUS EFFLUENT TO SELECTIVELY CONSTITUTED SOLID FROM IN A FLUIDIZED BED OF SOLID PARTICLES OF ALUMINUM CHLORIDE AT CONTROLLED TEMPERATURES.