Continuous recovery of styrene from a styrene-containing...

C - Chemistry – Metallurgy – 07 – C

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C07C 7/20 (2006.01) C07C 7/05 (2006.01) B01D 3/32 (2006.01) C07C 15/46 (2006.01)

Patent

CA 2364265

The invention relates to a method for the continuous recovery of styrene from a mixture containing same, by distillation of the mixture in a cascade of n distillation columns. According to said method, (i) an inflow containing a stabilizer system is fed into the first column and/or is placed into at least one of the distillation columns positioned upstream of the nth distillation column, whereby said stabilizer system comprises N-oxyl radicals; (ii) in the bottom of the nth distillation column a high-boiling fraction containing the stabilizer system and boiling at a higher temperature than styrene is concentrated; (iii) a partial flow of the high-boiling fraction is recycled and placed into at least one distillation column positioned upstream of the nth distillation column; and (iv) the remainder of the high-boiling fraction is withdrawn from the process.

L'invention concerne un procédé de préparation en continu de styrène à partir d'un mélange à base de styrène, par distillation dudit mélange dans une cascade de n colonnes de distillation. Selon ce procédé (i) un flux contenant un système stabilisant est introduit dans la première colonne et/ou un système stabilisant est introduit dans au moins une colonne de distillation montée en amont de la énième colonne de distillation, ledit système stabilisant contenant des radicaux N-oxyle; (ii) une fraction à point d'ébullition élevé qui contient le système stabilisant et dont le point d'ébullition est supérieur à celui du styrène est enrichie dans le bas de la énième colonne de distillation; (iii) un courant partiel de la fraction à point d'ébullition élevé est recyclé et est introduit dans au moins une colonne de distillation montée en amont de la énième colonne de distillation; (iv) la quantité résiduelle de la fraction à point d'ébullition élevé est enlevée du processus.

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