Separation processes
阅读：631发布：2023-02-05
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1. A THREE STAGE ABSORPTION-PURGE-DESORPTION PROCESS OPERATED ISOTHERMALLY AND ISOBARICALLY IN THE VAPOR PHASE AT A TEMPERATURE IN THE RANGE OF 200-600*C. AND A PRESSURE WITHIN THE RANGE OF 0-500 P.S.I.G. ON A PETROLEUM FRACTION FEEDSTOCK BOILING IN THE RANGE C4-40$C., SAID PROCESS USING AT LEAST ONE FIXED BED OF A 5A. MOLECULAR SIEVE ABSORBENT, EACH BED HAVING AT LEAST TWO INLET LINES AND AT LEAST TWO OUTLET LINES, EACH LINE HAVING AT LEAST ONE VALVE, THE VALVES IN THE INLET LINES BEING SWITCHED PERIODCALLY TO CHANGE THE FEEDSTOCK PASSING INTO THE ABSORBENT BED AND THE VALVES IN THE OUTLET LINES BEING SWITCHED PERIODICALLY TO DIVERT THE EFFLUENT PASSING OUT OF THE ABOSORBENT BED FROM ONE OUTLET LINE TO ANOTHER AND WHEREIN DURING THE CHANGEOVER FROM DESORPTION TO ABSORPTION, THE SWITCHING OF THE OUTLET VALVES IS DELAYED BEYOND THE SWITCHING OF THE INLET VALVES TO AN EXTENT UNTIL 50 TO 90% OF THE MATERIAL PRESENT IN THE VOIDS BETWEEN ABSORBENT PARTICLES WHEN THE INLET VALVES ARE SWITCHED IS REMOVED FROM THE ABSORBER BEFORE THE OUTLET VALVES ARE AWITCHED AND DURING ALL OTHER CHANGEOVERS THE SWITCHING OF THE OUTLET VALVES IS DELAYED FOR THE SAME PERIOD AS DURING THE CHANGEOVER FROM DESORPTION TO ABSORPTION, THE PURGING MEDIUM EMPLOYED IN THE PURGE STEP BEING AN INERT GAS AND AT LEAST ONE N-PARAFFIN BOILING BELOW THE INITIAL BOILING POINT OF THE FEEDSTOCK BEING EMPLOYED AS DESORBING MEDIUM.
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