Process for purifying p-tolualdehyde

Details Process for purifying p-tolualdehyde Process for purifying p-tolualdehyde

1974-09-30

1976-05-11

Morgenstern, Norman

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 4524

Patent

active

039563944

ABSTRACT:
P-Tolualdehyde is separated with a high purify from a mixture of tolualdehyde isomers having a mole fraction of p-tolualdehyde of at least 0.27, on the basis of total tolualdehyde isomers by cooling the mixture to a crystallization temperature of -6.degree. to -60.degree.C, thereby crystallizing p-tolualdehyde, and separating the resulting p-tolualdehyde crystals from mother liquor. A solvent such as an aliphatic hydrocarbon having 1 to 9 carbon atoms or an alicyclic hydrocarbon having 3 to 9 carbon atoms can be added to the mixture before cooling to improve the crystallization conditions. The resulting crystals can be washed with a washing agent, such as said solvent, to remove the other isomers adhering to the crystals.

REFERENCES:
patent: 2462739 (1949-02-01), Gresham
patent: 2485237 (1949-10-01), Gresham et al.
patent: 2534017 (1950-12-01), Gresham et al.
patent: 3284508 (1966-11-01), Gray et al.
patent: 3369048 (1968-02-01), Hamilton et al.
patent: 3636157 (1972-01-01), Bozik et al.
Wolf, "Chem. Abstracts", Vol. 71, p. 38588b, (1969).

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