Process for the preparation of anthraquinone dispersions and the

Details Process for the preparation of anthraquinone dispersions and the Process for the preparation of anthraquinone dispersions and the

1985-12-18

1988-01-05

Hollrah, Glennon H.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

260369, 162 76, C07C 5018, D21C 320

Patent

active

047174510

ABSTRACT:
The process of making a wet or dry dispersion containing anthraquinone suitable for use in the alkaline digestion of wood comprising cyclizing ortho-benzoylbenzoic acid at a temperature of about 150.degree. to 180.degree. C. and at an absolute pressure between about 5 and 40 millibars in the presence of between about 0.05 to 2 parts by weight of sulfuric acid, having a concentration of at least about 95%, per part by weight of ortho-benzoylbenzoic acid to form a reaction mixture containing anthraquinone, bringing the reaction mixture to a pH of at least about 7 by addition thereto at a temperature between about ambient temperature and 100.degree. C. of an aqueous solution of sodium hydroxide or potassium hydroxide containing between about 10% to 40% hydroxide by weight, and then forming a dispersion thereof and using such dispersion in the alkaline digestion of wood.

REFERENCES:
patent: 1591712 (1926-04-01), Lewis
patent: 3089879 (1963-03-01), Serres, Jr. et al.
patent: 4002653 (1977-03-01), Reuter et al.
patent: 4012280 (1977-03-01), Holton
patent: 4045456 (1977-08-01), Merger et al.

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