Process for the purification of 1,1-diphenylethane with good fra

Details Process for the purification of 1,1-diphenylethane with good fra Process for the purification of 1,1-diphenylethane with good fra

1989-09-21

1990-07-31

Manoharan, Virginia

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 37, 203 80, 585400, 585700, B01D 300

Patent

active

049448480

ABSTRACT:
A process for the purification of 1,1-diphenylethane with good fragrance quality. The product is produced by first subjecting the distillation residue from ethylbenzene production to distillation, then treating the distillate with sulfuric acid, separating the sulfuric acid phase, washing the oil phase with an alkali metal hydroxide solution and water, and subjecting the oil phase thus obtained to a second distillation.

REFERENCES:
patent: 2563628 (1951-08-01), Viles
patent: 3631211 (1971-12-01), Schmerling
patent: 3679760 (1972-07-01), Schmerling
patent: 3870659 (1975-03-01), Bozzato et al.
patent: 3929676 (1975-12-01), Chappell et al.
patent: 3929677 (1975-12-01), Hall et al.
patent: 4011274 (1977-03-01), Watanabe
patent: 4033829 (1977-07-01), Higgins, Jr. et al.
patent: 4435251 (1984-03-01), Takeda et al.
Mamedov, "Role of 1,1-diphenyethane in the disproportionation of ethylbenzene . . . " Chem. Abst. vol. 73, 1970; 120212z.
Equivalent to German Patent No.2401373 cited in the instant spec. p. 3.
Perfume and Flavor Chemicals (Aroma Chemicals) NR 2007; Methyl Diphenyl Methane, Steffen Arctander.
Chem. Berichte, (1932), 65, pp. 1686-1688, "Ueber Anlagerungsprodukte Von Styrol an Aromatische Kohlenwasserstoffe" A. Spilker et al.

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