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CHMB42H3 (7)
Final

Lab Exam Preparation

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Department
Chemistry
Course
CHMB42H3
Professor
Wanda/ Lana
Semester
Winter

Description
Dehydration of Cyclohexanol Purpose: o Acid catalyzed dehydration of cyclohexanol to form cyclohexene using a distillation apparatus o Purify through microextraction and microfiltration Theory: o Dehydration = -H2O and form double bond (E1 mechanism) o Acid catalyst otherwise (-OH) not good LG o Distillation: Separate according to bp Cyclohexene (83 C) and Cyclohexanol (161 C) Thus, cyclohexene extracted but as an azeotrope o Microscale- Extraction Need to separate azeotrope (Cyclohexanol + H2O + Cyclohexene) Based on different solubilities Use saturated salt solution NaCl why? Cyclohexanol more soluble in polar salt solution Cyclohexene non-polar thus not soluble in salt solution o Microfiltration Remaining water removed by adding anhydrous Na2SO3 and doing microfiltration to removing (sodium sulphate + H2O) o 2 distillation Why? React any remaining cyclohexanol Xylene chaser added why? Chaser = solvent added to increase volume but doesnt react with product www.notesolution.com
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