Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

2005-02-15

2005-02-15

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S066000, C564S067000, C564S068000, C564S069000, C564S071000, C564S072000

Reexamination Certificate

active

06855846

ABSTRACT:
Process for the preparation of urea from ammonia and carbon dioxide in which all or part of the liquid ammonia needed for the process is supplied to the high-pressure scrubber in such a way that it is in direct contact with the other streams supplied to this scrubber. In particular in such a way that there is direct contact between the liquid ammonia and the off-gases transferred to the high-pressure scrubber from the urea synthesis reactor. More in particular in such a way that there is direct contact between the liquid ammonia and the off-gases transferred to the high-pressure scrubber from the urea reactor and with the carbamate stream, which is transferred from the low-pressure urea recovery section.

REFERENCES:
patent: 155 735 (1998-10-01), None
“DSM Carbon Dioxide Stripping Process”,European Chemical News Urea Supplement, Jan. 17, 1969, pp. 17, 19-20.

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