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Specialty Chemistry Forums => Chemical Engineering Forum => Topic started by: bhaskaran on July 25, 2007, 07:46:46 AM

Title: cyclohexane+hmdo seperation
Post by: bhaskaran on July 25, 2007, 07:46:46 AM

Can anyone suggest how to seperate cyclohexane+HMDO(Hexamethyldisilaxane) mixture?
Feed composition : Cyclohexane :81%
HMDO : 18%
Water : 1%

Desired purity: Cycloheaxne :>99.5%
HMDO :<0.3%

Regards,
Bhaskaran.r

Title: Re: cyclohexane+hmdo seperation
Post by: AWK on July 25, 2007, 08:09:40 AM

Azeotrope methanol-cyclohexane contains 37 % of methanol and shows boiling point about 54 C. This azeotrope after distillation separates into two phases, the upper contains a large excess of cyclohexane. After rinsing this phase with water and distillation you probably obtain quite pure cyclohexane. Note, you can reuse lower layer for recycling