Separation of 1-pentanol from cyclopentanol by extractive distillation

• US 5,320,715 A
• Filed: 01/14/1994
• Issued: 06/14/1994
• Est. Priority Date: 01/14/1994
• Status: Expired due to Fees

• Current Assignee: Lloyd Berg
• Original Assignee: Lloyd Berg
• Inventors: Berg, Lloyd
• Primary Examiner(s): Bascomb, Jr., Wilbur
• Application Number:
  US08/181,017
• Time in Patent Office: 151 Days
• Field of Search: 203/64, 203/57, 203/58, 203/56, 203/51, 568/913, 568/918
• US Class Current: 203/57
• CPC Class Codes: C07C 2601/08 the ring being saturated
• CPC Class Codes: C07C 29/84 by extractive distillation
• CPC Class Codes: C07C 31/125 containing five to twenty-two carbon atoms
• CPC Class Codes: C07C 35/06 containing a five-membered rings

Abstract

1-Pentanol is difficult to separate from cyclopentanol by conventional distillation or rectification because of the closeness of their boiling points. 1-Pentanol can be readily separated from cyclopentanol by extractive distillation. Effective agents are ethylene glycol and sulfolane.

Claims

1. A method for recovering 1-pentanol from a mixture of 1-pentanol and cyclopentanol which comprises distilling a mixture of 1-pentanol and cyclopentanol in the presence of about one part of an extractive agent per part of 1-pentanol - cyclopentanol mixture, recovering the 1-pentanol as overhead product and obtaining the cyclopentanol and the extractive agent from the stillpot, wherein said extractive agent consists of one material selected from the group consisting of ethylene glycol, propylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4butanediol, 2,3-butanediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 400, 1,2,6-trihydroxyhexane, glycerine, sulfolane and dimethylsulfoxide.