316. CARLSON, C. S., ROBERTSON, N. C., AND PORTER, C. E. (Standard Oil Development Co.). Recovery of Normal Propyl Alcohol From Oxygenated Compounds. United States Patent 2,489,619, Nov. 29, 1949; appl. filed Aug. 23, 1948. Serial No. 45,724; 17 claim

Patent Abstracts

316. CARLSON, C. S., ROBERTSON, N. C., AND PORTER, C. E. (Standard Oil Development Co.). Recovery of Normal Propyl Alcohol From Oxygenated Compounds. United States Patent 2,489,619, Nov. 29, 1949; appl. filed Aug. 23, 1948. Serial No. 45,724; 17 claims (Cl. 202-42). Chem. Abs., vol. 44, 1950. p. 1526.

PrOH is recovered form mixtures with H₂O aldehydes, esters, and ketones by taking the propyl out from the Fischer-Tropsch synthesis, oxo process, etc. and subjecting it to azeotropic fractionation with an aliphatic ether. Use of an ether b. 55º-70º results in no loss of PrOH, whereas ethers that b. 70º-110º may be used to form an azeotrope with PrOH; if the R₂O is used in limited amounts in such cases, it is possible to remove the contaminants with very little loss of PrOH when a continuous still is used. Low-boiling R₂O is preferred for batch distillations in which the impurities are removed and PrOH remains as still residue. If paraldehyde is present, a pH of 3 should be maintained in the fractionation zone. Specific claims of iso-Pr₂O and tert-BuOEt are made. Gives a diagrammatic flowsheet of distillation system.

CARMODY, D. R. See Abs. 3339.