Phosphite coke inhibitors for edc-vcm furnaces

C - Chemistry – Metallurgy – 10 – G

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C10G 9/16 (2006.01) C07C 17/25 (2006.01) C10G 75/04 (2006.01)

Patent

CA 2411120

A method of reducing the formation of coke deposits on the heat-transfer surfaces of an ethylene dichloride to vinyl chloride pyrolysis furnace comprising exposing the heat transfer surfaces of said pyrolysis furnace to a phosphite selected from the group consisting of phosphites with the general formula: wherein A1, A2 and A3 are selected from the group consisting of OR1, - SR2 and Cl, wherein R1 and R2 are selected from the group consisting of alkyl, aryl, alkylaryl and arylalkyl, wherein A1, A2 and A3 may be the same or different, provided that at least one of A1, A2, and A3 is not Cl.

Cette invention concerne un procédé permettant de réduire la formation de dépôts de coke sur les surfaces de transfert de chaleur d'un four à pyrolyse pour transformation de dichlorure d'éthylène (EDC) en chlorure de vinyle, qui consiste à exposer lesdites surfaces à un phosphure pris dans le groupe de phosphures de formule générale (I). Dans cette formule, A¿1?, A¿2? et A¿3? sont pris dans le groupe composé de OR¿1?, -SR¿2? et Cl, dans lequel R¿1? Et R¿2? sont pris dans le groupe comprenant un alkyle, aryle, alkylaryle et arylalkyle, et où A¿1?, A¿2? et A¿3? Peuvent être identiques ou différents à condition que l'un au moins de A¿1?, A¿2? et A¿3? Ne soit pas Cl.

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