PROCESS FOR INHIBITOR EXCHANGE IN RADICALLY REACTIVE OLEFINICALLY UNSATURATED SYSTEMS

摘要

PCT No. PCT/EP90/01976 Sec. 371 Date Jul. 24, 1992 Sec. 102(e) Date Jul. 24, 1992 PCT Filed Nov. 19, 1990 PCT Pub. No. WO91/08192 PCT Pub. Date Jun. 13, 1991.The invention describes a process for the partial or complete exchange of the free radical inhibitors (preparation inhibitor) from their admixtures with free radical-reactive-and especially polymerizable and/or cross-linkable-olefinically mono- and/or polyunsaturated compounds against free radical inhibitors or inhibitor systems (application inhibitor), the kind and amount of which are freely determinable. The process according to the invention is characterized in that admixtures reactive via free radicals are employed which contain, as the preparation inhibitor, appropriate compounds of the phenol type comprising hydroxyl groups capable of forming salts, this feedstock mixture as a liquid phase is subjected to a treatment with solid oxides, carbonates and/or hydroxides of the alkali metals and/or alkaline earth metals, which may also be present in admixture with further oxidic metal compounds, thereby in a pre-determinable manner binding all or part of the preparation inhibitor to the solid phase, the resulting solid phase is separated from the liquid phase, and the content of the application inhibitor in this liquid phase is adjusted with respect to kind an amount thereof. The process is preferably applied to free radical-reactive substance mixtures, from which the preparation inhibitors contained therein cannot be satisfactorily removed by way of a distillation.