Preparation of anthraquinone from tetrahydroanthraquinone

Details Preparation of anthraquinone from tetrahydroanthraquinone Preparation of anthraquinone from tetrahydroanthraquinone

1978-09-22

1981-08-18

Garvin, Patrick

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5018

Patent

active

042845769

ABSTRACT:
In the preparation of anthraquinone by reacting a mixture containing naphthalene, phthalic anhydride and tetrahydroanthraquinone with oxygen at elevated temperature while simultaneously separating off at least part of the naphthalene, the improvement which comprises supplying the naphthalene, phthalic anhydride and tetrahydroanthraquinone to a distillation system which consists of a column having a rectifying section, a stripping section and a boiler, at least one of the stripping section and the boiler being designed so that rapid through-passage of the feed mixture is prevented. Downcomers in the stripping section maintain liquid levels on the trays of about 5 to 500 mm and the boiler may have several successive chambers to provide the desired residence time in the system. A liquid mixture of naphthalene, phthalic anhydride and anthraquinone is removed from the boiler while a gas mixture including naphthalene is taken off from the rectifying section, being cooled to condense naphthalene for use in oxidation to naphthoquinone and phthalic anhydride.

REFERENCES:
patent: 1114843 (1914-10-01), Wright
patent: 2839369 (1958-06-01), Mulllins
patent: 3062616 (1962-11-01), Chadwick
patent: 3870730 (1975-03-01), Scharfe et al.
Kirschbaum, "Distillation & Rectification", Chem. Pub. Co. Inc., N.Y. 1948, TP/156/D5k5, pp. 120, 154-156.

Affiliated with

Also associated with

Rating

Preparation of anthraquinone from tetrahydroanthraquinone does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Preparation of anthraquinone from tetrahydroanthraquinone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of anthraquinone from tetrahydroanthraquinone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-37224