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Expired
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GB20298/55A
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Stamicarbon BV
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Stamicarbon BV
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Publication of GB771420ApublicationCriticalpatent/GB771420A/en
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
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Organic Chemistry
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Abstract
A process for granulating urea by causing a highly concentrated aqueous solution of urea or molten urea in the form of drops to fall through a column of thin mineral oil at a temperature below the solidification point of the urea drops is characterized by the addition to said mineral oil of such quantity of a wax or wax-like substance, which is an oily liquid at molten urea temperature but is a solid at 50 DEG C. or below, as will form an unctuous mass at 25 DEG C. but a completely homogeneous highly fluid liquid at 75 DEG C. The wax or wax-like additive is preferably paraffin wax or stearic acid, and the resulting oil mixture preferably contains at least 15 per cent by weight of such additive.
GB20298/55A1954-07-161955-07-13Improvements relating to the preparation of urea granules
ExpiredGB771420A
(en)
A procedure for the production of compositions to combat gastro-intestinal parasites in animals. (Machine-translation by Google Translate, not legally binding)
Procedure for the preparation of a finally divided wax composition containing a herbicide material (Machine-translation by Google Translate, not legally binding)
Improved procedure for the obtaining of extinguishing compositions based on monoamonic orthophosphate. (Machine-translation by Google Translate, not legally binding)
Method of preparation of a composition for coating a piece of metal foundation in white forming on it a lubricant and protective film (Machine-translation by Google Translate, not legally binding)