Isolation of dimethyl 4,4'-biphenyldicarboxylate

Details Isolation of dimethyl 4,4'-biphenyldicarboxylate Isolation of dimethyl 4,4'-biphenyldicarboxylate

1994-04-13

1995-03-14

Manoharan, Virginia

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

23295R, 203 91, 203DIG16, 560 78, B01D 310, B01D 902, C07C 6752

Patent

active

053974409

ABSTRACT:
Process for isolating dimethyl 4,4'-biphenyldicarboxylate from residues of DMT production, which includes first distilling the residues at a pressure of at most 7 mbar at a boiler temperature from 200.degree. to 350.degree. C., subsequently treating the distillate which distills over in the range from 230.degree. to 270.degree. C. at a pressure of, for example, 0.2 mbar for from 10 to 60 minutes with 0.7 to 10 times the amount of an organic solvent at a temperature from 70.degree. to 180.degree. C., if required, separating the clear solution from undissolved components, cooling the removed clear solution to a temperature from 45.degree. to 65.degree. C. and allowing it to crystallize at this temperature, resulting in a suspension of dimethyl 4,4'-biphenyldicarboxylate crystals from which the crystals are isolated by washing one or more times with the same or a different solvent and by drying.

REFERENCES:
patent: 3227153 (1966-10-01), Pieroh et al.
patent: 3914287 (1975-10-01), Takeda
patent: 4683034 (1987-07-01), Bader et al.
patent: 5116518 (1992-05-01), Bachmann et al.
European Search Report, No. 94105455.3, Jun. 27, 1994.

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