Method for the continuous production of acetylene diurea

Details Method for the continuous production of acetylene diurea Method for the continuous production of acetylene diurea

2006-01-17

2006-01-17

Saeed, Kamal A. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

06987190

ABSTRACT:
The continuous production of acetylene diurea takes place by means of the reaction of glyoxal with urea in the presence of mineral acids. The reaction is carried out in at least one reactor having a mixing device, into which glyoxal, urea, and mineral acid are continuously fed, and from which a suspension of acetylene diurea in mother liquor is discharged. The acetylene diurea is mechanically removed from the mother liquor, and the remaining mother liquor is recycled back into the reactor, in whole or in part.

REFERENCES:
patent: 2731472 (1956-06-01), Reibnitz
patent: 2803564 (1957-08-01), Gagarine et al.
patent: 3061423 (1962-10-01), Symes et al.
patent: 2000 264887 (2000-09-01), None
patent: 2000 290281 (2000-10-01), None
patent: 2001 097974 (2001-04-01), None
Ann. Chem. 333, (1904) pp 101 to 111.
Chem. Inc. 1979, p. 29 to 30.
Soil Sci. Plant. Nutr. 33 (1987, pp. 291 to 298).
Chemistry and Industry, Jan. 1979, pp. 29 to 30 (Glycoluril as a slow-release nitrogen source for plants).
Abstract XP-002250668 “Glycoluril as a slow release nitrogen fertilizer” Shimizu, Toshio. Chemical Abstract Service. Soil Science and Plant Nutrition (Tokyo, Japan)(1987), 33(2), 291-298.
Abstract XP-002250669 Section Ch, Week 200114, Derwent Publication Class CO2, AN 2001-127343 JP 2000 290281 A (Mitsui Chem Inc.), Oct. 17, 2000.

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