Improved urea synthesis process and apparatus therefor

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 273/04 (2006.01) B01D 5/00 (2006.01) B01D 53/00 (2006.01) B01J 3/04 (2006.01) B01J 10/00 (2006.01) B01J 19/00 (2006.01) B01J 19/02 (2006.01) B01J 19/26 (2006.01)

Patent

CA 2268974

Image Image Image The present invention provides an improved process for synthesizing urea from ammonia and carbon dioxide while preventing corrosion of sites, that are to be in contact with a condensate, of the joints of a tube plate and cooling tubes in a condenser installed vertically or horizontally. According to this process, the sites, that are to be in contact with the condensate, of the joints of the tube plate and the cooling tubes in the condenser are prevented from corrosion by enveloping the sites with liquid ammonia or a solution rich in ammonia in the synthesis of urea comprising separating unreacted ammonia and carbon dioxide as a gaseous mixture thereof from a urea synthesis solution at a pressure substantially equal to the urea synthesis pressure, bringing the gaseous mixture into contact with an absorption medium in the condenser to form a condensate, and recirculating the condensate to the synthesis column. 39

L'invention concerne un procédé amélioré permettant d'effectuer la synthèse de l'urée à partir de l'ammoniaque et du dioxyde de carbone, en utilisant un condenseur placé verticalement ou horizontalement, afin d'éviter la corrosion des zones dans lesquelles la plaque tubulaire du condenseur se rattache aux tuyaux de refroidissement et où il y a contact avec un condensat. Spécifiquement, l'invention concerne un procédé qui consiste à séparer l'ammoniaque et le dioxyde de carbone que la réaction n'a pas altérés, sous forme de mélange gazeux combinant les deux, en travaillant à partir d'une solution de synthèse de l'urée sous une pression pratiquement égale à celle de la synthèse de l'urée, puis en mettant le mélange gazeux au contact d'un absorbant dans un condenseur, via un tuyau de synthèse de l'urée, de manière à préparer l'urée. Dans l'opération, les zones où la plaque tubulaire du condenseur se rattache aux tuyaux de refroidissement et où il y a contact avec le condensat sont recouvertes d'ammoniaque ou d'un liquide riche en ammoniaque, ce qui permet de protéger lesdites zones contre la corrosion.

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