PROCESS FOR RECOVERING PHOSPHANE AND METHYL PHOSPHANE

PROCESS FOR RECOVERING PHOSPHANE AND METHYL PHOSPHANE

1. A process for recovering phosphane, methylphosphane or a mixture of these two phosphanes from a waste gas mixture containing these phosphanes together with hydrogen, nitrogen and nonpolar lower hydrocarbons with 1 to 4 carbon atoms, alone or in combination which comprises : contacting the waste g...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KLOSE, WERNER, HEYMER, GERO, JODDEN, KLAUS
Format: Patent
Sprache:eng ; ger
Schlagworte:
ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
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Beschreibung
Zusammenfassung:1. A process for recovering phosphane, methylphosphane or a mixture of these two phosphanes from a waste gas mixture containing these phosphanes together with hydrogen, nitrogen and nonpolar lower hydrocarbons with 1 to 4 carbon atoms, alone or in combination which comprises : contacting the waste gas mixture at temperatures within the range -20 to +30 degrees C with unpretreated Na-A grade zeolites having a pore size of 5 x 10**-8 to 15 x 10**-8 cm ; the phosphanes being absorbed by the zeolites until these latter are saturated therewith and separated from the remainder of the waste gas mixture ; heating the zeolites to 180 to 230 degrees C and collecting the desorbing phosphanes practically in pure form.