Water removal in purification of vinyl chloride

Details Water removal in purification of vinyl chloride Water removal in purification of vinyl chloride

C - Chemistry, Metallurgy

07

C

C07C 17/38 (2006.01) C07C 17/383 (2006.01) C07C 21/06 (2006.01)

Patent

CA 2369960

Removal of water in a vinyl chloride monomer purification system is achieved through (1) providing a distillation column for separation of a liquid admixture of vinyl chloride, hydrogen chloride, and water into (a) an essentially pure vinyl chloride product stream and (b) a hydrogen chloride distillate stream; and (2) placing a drying system in fluid communication with the distillation column midsection at a connection point where the water is at sufficient concentration to provide a useful mass transfer flux of water from a withdrawn midsection stream into a drying agent.

L'invention concerne l'élimination d'eau à l'aide d'un système de purification de monomères de chlorure de vinyle. On réalise cette élimination (1) au moyen d'une colonne de distillation servant à séparer un adjuvant liquide de chlorure de vinyle, de chlorure d'hydrogène et d'eau en (a) un courant de produit de chlorure de vinyle essentiellement pur et (b) un courant de distillat de chlorure d'hydrogène, et (2) en plaçant un système de dessiccation en communication fluidique avec la section intermédiaire de la colonne de distillation à un point de connexion où l'eau est en concentration suffisante pour présenter un flux de transfert de masse d'eau utile depuis un courant retiré de la section intermédiaire jusqu'à un agent dessiccatif.

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