Process for producing oxamide granules

Details Process for producing oxamide granules Process for producing oxamide granules

1993-07-08

1995-02-28

Lander, Ferris

Chemistry: fertilizers

Processes and products

Organic material-containing

71 6403, 71 6413, 564135, 564160, C07C10206, C07C 6736, C06G 300

Patent

active

053933192

ABSTRACT:
Oxamide granules are produced by (A) feed-mixing ammonia to a starting material comprising 60 to 100 weight % of a diester of oxalic acid with a C.sub.1-6 aliphatic alcohol, and 0 to 40 weight % of the same aliphatic alcohol as mentioned above, to produce oxamide and the aliphatic alcohol as by-product, while controlling the aliphatic alcohol content to 5 to 40% based on the weight of the reaction mixture to provide the resultant oxamide wetted by the aliphatic alcohol; (B) granulating the wetted product while maintaining the content of the aliphatic alcohol at a level of 5 to 40% based on the weight of the wetted reaction product; (C) heat-evaporating away the aliphatic alcohol from the wetted granules; and optionally (D) re-wetting the resultant dry oxamide granules with water in an amount of 5 to 20% based on the weight of the dry oxamide granules; and (E) re-drying the re-wetted oxamide granules, to provide oxamide granules having an enhanced mechanical strength and form-stability in water.

REFERENCES:
Abstract, J59169527, Ubei Mar. 1983, "Granula oxamide . . . PUA".
Abstract, J52007916, Ubei, Aug. 1984, "Oxamide M(r . . . action".
USSR, SU-900753, Parkhomenk et al Jan. 23, 1983 "Prep of Slow-Release . . . in soil".

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