Method of inhibiting the thermopolymerization of isoprene and bu

Details Method of inhibiting the thermopolymerization of isoprene and bu Method of inhibiting the thermopolymerization of isoprene and bu

1974-02-19

1976-04-20

Sofer, Jack

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For inhibiting or preventing a polymerization reaction

203 32, 203 33, 203 38, 203 59, 203 62, 203 63, 2606665, 2606815R, B01D 300, C07C 718

Patent

active

039517543

ABSTRACT:
A method of inhibiting the thermopolymerization of isoprene or butadiene in the process of isolation thereof by extractive distillation from a mixture of hydrocarbons obtained in dehydrogenation of isopentane and butane. The method of inhibiting includes, prior to the introduction of said mixture of hydrocarbons and a polar extractant into an extractive distillation metal apparatus, treating the surface of the apparatus with a 1-25% aqueous solution of passivators, viz. nitrites, sulphites or phosphates of alkali metals at a temperature of 20.degree.-100.degree.C. The mixture of hydrocarbons and the polar extractant with an inhibitor of isoprene or butadiene thermopolymerization introduced into the polar extractant are then fed into said apparatus in an amount of 0.01-1% of the extractant weight. The present method makes it possible to reduce markedly the formation of isoprene and butadiene and, hence, to prevent the plugging of the extractive distillation apparatuses with the aforementioned thermopolymers.

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patent: 3551507 (1970-12-01), Sakuragi et al.
patent: 3681202 (1972-08-01), Funkhouser

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