Purification of tri-alkyl compounds of Group 3a metals
AssigneeShell Research Limited
InventorsCornelis J. Smit, Gerbrand J. M. Van Eijden, Theodorus P. J. Peters, Pieter J. Reuvers
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Abstract
A tri-alkyl compound of a Group 3a metal is purified by a process in which a polyether of the formula ##STR1## wherein R independently is alkyl of 1 to 4 carbon atoms inclusive, each R' independently is hydrogen, methyl or ethyl; m is an integer from 1 to 6 inclusive; and n is an integer from 1 to 12 inclusive, is added to a composition comprising a tri-alkyl compound and the polyether. The adduct is heated to dissociate the adduct thermally into a mixture containing tri-alkyl compound of the Group 3a metal, and the mixture is subjected to distillation to recover the tri-alkyl compound of the Group 3a metal.
Claims14
A process for the purification of tri-alkyl compound of Group 3a metal selected from the group of aluminum, gallium, indium and thallium by adding (i) a polyether of the formula ##STR3## wherein R independently is alkyl of 1 to 4 carbon atoms inclusive, R' independently is hydrogen, methyl or ethyl, m is an integer from 1 to 6 inclusive and n is an integer from 1 to 12 inclusive, to (ii) an impure mixture comprising a tri-alkyl compound of said Group 3a metal, thereby obtaining an adduct of the tri-alkyl compound and the polyether, heating the adduct to produce tri-alkyl compound of said Group 3a metal;
- and recovering the tri-alkyl compound of said Group 3a metal by distillation.
Dependencies are inferred from the claim text.