The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1977
Filed:
Mar. 23, 1966
Mathieu Bongard, Rotterdam, NL;
Stamicarbon, N.V., Geleen, NL;
Abstract
A urea synthesis process is disclosed, wherein carbon dioxide and ammonium carbamate are reacted at elevated pressure to form urea, the resulting process stream is heated at reduced pressure to decompose ammonium carbamate, the off-gas from the ammonium carbamate decomposition is separated from the residual process stream (containing produce urea), and the off-gas is condensed to form an ammonium carbamate solution which is recycled to urea synthesis. A minimum amount of water in the condensate is recycled to the urea synthesis by taking an expanded gas-liquid mixture from a pressure reduction stage and directly separating the gas and liquid phases in such mixture without the application of heat thereto, thereafter heating the separated liquid phase to vaporize part of the liquid therein, and subjecting the resultant gas-mixture to separation, and condensing the gas phases obtained from both gas-liquid separations as condensate to be recycled to urea synthesis.