Method for producing organic fertilizers
AssigneesChisso Corporation, Sanyo-Kokusaku Pulp Co., Ltd.
InventorsHiroaki Ishibashi, Shizuo Tanoue, Masakuni Kudo, Isamu Harada
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Abstract
Organic fertilizers having a superior fertilizer response (or efficiency), and a higher nitrogen content but a lower water-insoluble type nitrogen content are prepared from spent liquors of sulfite pulp plants according to the method of the present invention. Said method comprises setting the solid matter concentration of said spent liquors in the reaction liquid consisting mainly of said spent liquors to 20-45% by weight and reacting therewith ammonia in an amount of 15-30 mol per 1 Kg of said solid matter, and oxygen or oxygen-containing gas at a reaction temperature of 90.degree.-120.degree. C. under a pressure of 4 Kg/cm.sup.2 or higher and lower than 10 Kg/cm.sup.2.
Claims3
A method of producing organic-type fertilizer from the spent liquors of sulfite pulp, which method comprises:
- (a) adjusting the solid matter concentration of said spent liquors to 20-45% by weight,
- (b) reacting said spent liquor with
- (1) 15-31 mols of ammonia per 1 Kg of said solid matter, and
- (2 oxygen or an oxygen-containing gas
- (c) carrying out the reaction of step (b) at a temperature of 90.degree.-120.degree. C. and under a pressure of greater than or equal to 4 Kg/cm.sup.2 but less than 10 Kg/cm.sup.2.
Dependencies are inferred from the claim text.