Method of removing solvent from polymer solution and solvent...

C - Chemistry – Metallurgy – 08 – F

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C08F 6/10 (2006.01) C08F 6/12 (2006.01)

Patent

CA 2490770

A method of efficiently removing the solvent from a polymer solution formed by solution polymerization; and a solvent removing apparatus therefor. In particular, a method of removing the solvent from a polymer solution, comprising bringing a polymer solution into contact with steam to thereby remove the solvent through steam stripping, which method comprises the steps of feeding portion of steam into pipe (2) for transferring the polymer solution to solvent removal tank (1) and feeding the rest of steam into the solvent removal tank (1). It is preferred that providing that the total amount of steam is 100 mass%, the amount of steam fed to the pipe (2) be in the range of 10 to 90 mass%. As the polymer contained in the polymer solution, there can be mentioned various polymers, such as butadiene rubber, styrene-butadiene rubber and ethylene-.alpha.-olefin-nonconjugated diene copolymer rubber. The solvent is preferably n-hexane, n-heptane, cyclohexane, toluene, etc.

Cette invention concerne un procédé efficace d'extraction d'un solvant d'une solution formée par polymérisation, et un dispositif d'extraction de solvant. L'invention concerne en particulier un procédé d'extraction de solvant d'une solution polymère, dans lequel on met une solution polymère en contact avec de la vapeur pour retirer le solvant par distillation par entraînement par la vapeur. Ce processus consiste à introduire une partie de la vapeur dans un tuyau (2) pour transférer le solvant dans un réservoir de solvant (1) et d'introduire le reste de la vapeur dans ledit réservoir (1). Si la quantité totale de vapeur est 100 % en masse, il est préférable d'introduire de 10 à 90 % en masse de la vapeur dans le tuyau (2). Pour ce qui est de la solution polymère, il peut s'agir de divers polymères, dont du caoutchouc de butadiène, du caoutchouc de styrène-butadiène ou du caoutchouc copolymère d'éthylène-diène .alpha.-oléfine non conjugué. Le solvant est de préférence un n-hexane, un n-heptane, un cyclohexane, un toluène, etc.

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