C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
C07C273/14—Separation; Purification; Stabilisation; Use of additives
C07C273/16—Separation; Purification
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Chemical & Material Sciences
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Organic Chemistry
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Vaporization, Distillation, Condensation, Sublimation, And Cold Traps
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Procédé de séparation d’un mélange contenant du dioxyde de carbone, au moins un composant plus lourd que le dioxyde de carbone et au moins un composant plus léger que le dioxyde de carbone