One Material Is Water Patents (Class 203/53)
A second material is aldehyde or ketone (Class 203/54)
A second material is an alcohol (Class 203/55)
  • Process for separating a high purity vinyl aromatic hydrocarbon from hydrocarbon mixtures containing the same
    Patent number: 3953300
    Abstract: Styrene of exceptional purity is separated from a mixture of hydrocarbons including it, xylenes, saturated and olefinic hydrocarbons and ethyl benzene by means of a two-step extractive distillation process through the use of a high boiling polar solvent such as N-formyl morpholine in admixture with an amount of water in the range of from 1% to 30% by weight.
    Type: Grant
    Filed: July 11, 1975
    Date of Patent: April 27, 1976
    Assignee: Snam Progetti, S.p.A.
    Inventors: Alessandro Ginnasi, Alessandro Vetere, Pierantonio Martera
  • Process for preparing technically pure acetic acid by extractive distillation
    Patent number: 3951755
    Abstract: Process for preparing technically pure acetic acid from water - acetic acid mixtures by extractive distillation with N-methyl acetamide.
    Type: Grant
    Filed: February 18, 1975
    Date of Patent: April 20, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Rudolf Sartorius, Hans Stapf