Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1977-01-27
1979-05-15
Vertiz, O. R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C12602
Patent
active
041547608
ABSTRACT:
A urea synthesis process for converting ammonia and carbon dioxide to urea is improved by providing an easy means of maintaining the urea synthesis zone in the process at a constant temperature. In the process the starting CO.sub.2 and up to and including 100 percent of the starting NH.sub.3 are reacted in a heat-recovery zone maintained at a urea synthesis pressure. Some of the heat of reaction is removed. The molar ratio of NH.sub.3 to CO.sub.2 which is fed into the heat-recovery zone is less than 4. The reaction mixture and the rest of the starting NH.sub.3 are fed into a urea synthesis zone maintained at urea synthesis pressure to produce urea. The improvement involves adjusting the amount of starting ammonia which is fed into the urea synthesis zone in response to any change in the temperature in the urea synthesis zone so that the urea synthesis zone is maintained at a substantially fixed temperature.
REFERENCES:
patent: 3105093 (1963-09-01), Rothkrans
patent: 3172911 (1965-03-01), Mavrovic
patent: 3270051 (1966-08-01), Braun
patent: 3356723 (1967-12-01), Kaasenbrood
patent: 3544628 (1970-12-01), Hsu
patent: 3636106 (1972-01-01), Villiers-Fisher
Inoue Shigeru
Kanai Kazumichi
Otsuka Eiji
Yoshimura Shinji
Mitsui Toatsu Chemicals Inc.
Roy Thomas W.
Vertiz O. R.
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