Recovering condensible material from vaporous mixtures

Claim 1

A METHOD FOR RECOVERING A NORMALLY SOLID SUBLIMABLE MATERIAL FROM A GASEOUS STREAM IN WHICH SAID SUBLIMABLE MATERIAL IS IN VAPOROUS FORM MIXED WITH NONCONDENSIBLE GAS, WHICH COMPRISES PASSING SAID VAPOR STREAM UPWARDLY THROUGH A ZONE MAINTAINED AT A TEMPERATURE WHICH STARTS CONDENSATION OF SAID SUBLIMABLE MATERIAL BUT AT WHICH SAID SUBLIMABLE MATERIAL STILL HAS A SUBSTANTIAL VAPOR PRESSURE; FEEDING INTO SAID ZONE WITH SAID VAPOR STREAM SAID SUBLIMABLE MATERIAL IN FINELY DIVIDED SOLID FORM; REGULATING THE VELOCITY OF SAID VAPOR STREAM UP THROUGH SAID ZONE AND FEEDING INTO SAID ZONE A SUFICIENT AMOUNT OF SAID SUBLIMABLE MATERIAL IN FINELY DIVIDED SOLID FORM TO MAINTAIN SAID FINELY DIVIDED SOLID MATERIAL IN THE FORM OF A FLUIDIZED DENSE SUSPENSION UP THROUGH WHICH THE GASEOUS STREAM IS PASSED AND CARRIES UPWARDLY THEREWITH SMALL PARTICLES OF THE SUBLIMABLE MATERIAL UNDERGOING VAPORIZATION; COOLING THE FLUIDIZED FINELY DIVIDED SOLID SUBLIMABLE MATERIAL IN SAID ZONE AS IT IS CONTACTED WITH THE UPFLOWING GASEOUS STREAM SO THAT A PORTION OF THE SUBLIMABLE MATERIAL VAPOR CONDENSES ON COOLER SURFACES OF SAID FLUIDIZED SOLID TO FORM THEREWITH LARGER SIZE SOLID PARTICLES; PASSING THE REMAINING GASEOUS STREAM CONTAINING VAPOR OF THE NORMALLY SOLID SUBLIMABLE MATERIAL LEAVING SAID ZONE INTO A SECOND ZONE MAINTAINED AT A SUBSTANTIALLY LOWER TEMPERATURE; CONTINUOUSLY INTRODUCING INTO SAID SECOND ZONE SAID SUBLIMABLE MATERIAL IN FINELY DIVIDED SOLID FORM TO MAINTAIN IN SAID SECOND ZONE A FLUIDIZED DENSE SUSPENSION OF SAID MATERIAL IN THE UP-FLOWING VAPOR STREAM; COOLING THE FLUIDIZED SOLID CONTACTED WITH THE VAPOR STREAM IN SAID SECOND ZONE SO THAT A REMAINING PORTION OF THE SUBLIMABLE MATERIAL VAPOR IN THE VAPOR STREAM CONDENSES ON COOLER SURFACES OF SAID FLUIDIZED SOLID; AND CONTINUOUSLY WITHDRAWING THUS FORMED LARGE PARTICLES FROM EACH OF SAID ZONES.

Claim 2

A METHOD FOR RECOVERING A NORMALLY SOLID SUBLIMABLE MATERIAL FROM A GASEOUS STREAM IN WHICH SAID SUBLIMABLE MATERIAL IS IN VAPOROUS FORM MIXED WITH NONCONDENSIBLE GAS, WHICH COMPRISES PASSING SAID VAPOR STREAM UPWARDLY THROUGH A ZONE MAINTAINED AT A TEMPERATURE WHICH STARTS CONDENSATION OF SAID SUBLIMABLE MATERIAL BUT AT WHICH SAID SUBLIMABLE MATERIAL STILL HAS A SUBSTANTIAL VAPOR PRESSURE; FEEDING INTO SAID ZONE WITH SAID VAPOR STREAM SAID SUBLIMABLE MATERIAL IN FINELY DIVIDED SOLID FORM; REGULATING THE VELOCITY OF SAID VAPOR STREAM UP THROUGH SAID ZONE AND FEEDING INTO SAID ZONE A SUFICIENT AMOUNT OF SAID SUBLIMABLE MATERIAL IN FINELY DIVIDED SOLID FORM TO MAINTAIN SAID FINELY DIVIDED SOLID MATERIAL IN THE FORM OF A FLUIDIZED DENSE SUSPENSION UP THROUGH WHICH THE GASEOUS STREAM IS PASSED AND CARRIES UPWARDLY THEREWITH SMALL PARTICLES OF THE SUBLIMABLE MATERIAL UNDERGOING VAPORIZATION; COOLING THE FLUIDIZED FINELY DIVIDED SOLID SUBLIMABLE MATERIAL IN SAID ZONE AS IT IS CONTACTED WITH THE UPFLOWING GASEOUS STREAM SO THAT A PORTION OF THE SUBLIMABLE MATERIAL VAPOR CONDENSES ON COOLER SURFACES OF SAID FLUIDIZED SOLID TO FORM THEREWITH LARGER SIZE SOLID PARTICLES; PASSING THE REMAINING GASEOUS STREAM CONTAINING VAPOR OF THE NORMALLY SOLID SUBLIMABLE MATERIAL LEAVING SAID ZONE INTO A SECOND ZONE MAINTAINED AT A SUBSTANTIALLY LOWER TEMPERATURE; CONTINUOUSLY INTRODUCING INTO SAID SECOND ZONE SAID SUBLIMABLE MATERIAL IN FINELY DIVIDED SOLID FORM TO MAINTAIN IN SAID SECOND ZONE A FLUIDIZED DENSE SUSPENSION OF SAID MATERIAL IN THE UP-FLOWING VAPOR STREAM; COOLING THE FLUIDIZED SOLID CONTACTED WITH THE VAPOR STREAM IN SAID SECOND ZONE SO THAT A REMAINING PORTION OF THE SUBLIMABLE MATERIAL VAPOR IN THE VAPOR STREAM CONDENSES ON COOLER SURFACES OF SAID FLUIDIZED SOLID; AND CONTINUOUSLY WITHDRAWING THUS FORMED LARGE PARTICLES FROM EACH OF SAID ZONES.