CHMB42H3 Final: Lab Exam Preparation
Document Summary
Purpose: acid catalyzed dehydration of cyclohexanol to form cyclohexene using a distillation apparatus, purify through microextraction and microfiltration, theory, dehydration = -h2o and form double bond (e1 mechanism, acid catalyst otherwise (-oh) not good lg, distillation: cyclohexene (83 c) and cyclohexanol (161 c) thus, cyclohexene extracted but as an azeotrope: microscale- extraction. need to separate azeotrope (cyclohexanol + h2o + cyclohexene) use saturated salt solution nacl why: cyclohexanol more soluble in polar salt solution, cyclohexene non-polar thus not soluble in salt solution, microfiltration. remaining water removed by adding anhydrous na2so3 and doing microfiltration to removing (sodium sulphate + h2o: 2nd distillation. xylene chaser added why: chaser = solvent added to increase volume but doesn"t react with product www. notesolution. com, xylene (bp = 140 c) thus appropriate. watch for a bead of condensate on thermometer. not too rapid decreases yield: microscale-extraction + microfiltration.
