US 5,260,496 AGranted

Process for separating mixtures of prefluorinated hydrocarbon compounds

AssigneeKali-Chemie Aktiengesellschaft

InventorsHasso Meinert, Juergen Mader

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Abstract

A process for separation of mixtures of partially- or perfluorinated hydrocarbon compounds, which optionally contain additional chain members from the heteroatom group nitrogen, oxygen, boron, phosphorus and sulfur and/or can be substituted by further halogen atoms, characterized in that such partially- or perfluorinated compounds, which have an acyclic straight-chain structure and a critical molecule diameter in the range from 4 to 7 .ANG. or are substituted by residues with a straight-chain acyclic structure and with a critical molecule diameter in the range from 4 to 7 .ANG., of such partially- or perfluorinated compounds, which have no straight-chain acyclic residues, and whose critical molecule diameter amounts to at least 1.1-fold times the that of the aforementioned straight-chain acyclic residues, in liquid or gaseous phase are separated in that a mixture or a solution of the mixture in an inert organic solvent, the molecular diameter of which is larger that of the aforementioned straight-chain acyclic residue, is contacted with an amount of a molecular sieve sufficient for adsorption, the average pore diameter of which lies in the range of the critical molecule diameter of the aforesaid acyclic residue or up to 30% less, separating the molecular sieve laden predominantly with compounds containing acyclic residues, and desorbing the compounds adsorbed on the molecular sieve.

Claims18

Dependent claims

A method of separating a mixture comprising:

A) at least one cyclic perfluorinated compound substituted by an unbranched acyclic residue, said acyclic residue having a critical molecule diameter ranging from 4 to 7 .ANG., and
B) at least one cyclic perfluorinated compound which has no unbranched acyclic moieties and whose critical molecule diameter is at least 1.1 times that of said unbranched acyclic residue, said cyclic perfluorinated compound having no unbranched acyclic moieties being substituted only by moieties having critical molecule diameters amounting to at least 1.1 times that of said unbranched acyclic residue, said process comprising the steps of:
a) contacting said mixture with a quantity of a molecular sieve sufficient to adsorb the cyclic perfluorinated compound substituted by an unbranched acyclic residue, said molecular sieve having an average pore opening diameter in the range from the critical molecule diameter of said unbranched acyclic residue to 30% less than the critical molecule diameter of said unbranched acyclic residue,
b) separating the molecular sieve laden with adsorbed cyclic perfluorocarbon compound substituted by an unbranched acyclic residue from a residual mixture depleted in cyclic perfluorocarbon compound substituted by an unbranched acyclic residue and containing the cyclic perfluorocarbon compound which has no unbranched acyclic moieties, and
c) desorbing the adsorbed cyclic perfluorocarbon compound substituted by an unbranched acyclic residue from the molecular sieve.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/835,462Filed 28 Feb 1992
Priority: DE 392869230 Aug 1989
Granted: 9 Nov 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

A61K 9/0026
Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in…
C07D 207/10
Having no double bonds between ring members or between ring members and non-ring members: with hetero atoms or with carbon atoms having three…
C07D 211/38
With hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals,…:…
C07D 265/30
1,4-Oxazines; Hydrogenated 1,4-oxazines: not condensed with other rings