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Machine translation
1. (WO1981000402) BASIC ALUMINUM NITRATE CRYSTALLIZATION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000402    International Application No.:    PCT/US1980/000553
Publication Date: 19.02.1981 International Filing Date: 09.05.1980
IPC:
C01F 7/66 (2006.01)
Applicants:
Inventors:
Priority Data:
61296 27.07.1979 US
Title (EN) BASIC ALUMINUM NITRATE CRYSTALLIZATION
(FR) CRISTALLISATION DU NITRATE D"ALUMINIUM BASIQUE
Abstract: front page image
(EN)Process for preparing large crystals of basic aluminum nitrate (BAN) from a nitric acid feed solution containing Al2O3 values comprising the steps of: (1) evaporating water and nitric acid from the solution in a single step evaporation performed at a temperature of between about 270 and about 450 F and at a pressure of between about atmospheric and about 60 psig to produce an evaporated liquor comprising at least about 16% alumina by weight; (2) holding the evaporated liquor in a quiescent state for a period of between about 20 minutes and about two hours within the temperature range of about 270 F to about 350 F; (3) injecting water into the product of step 2, the water being added in an amount sufficient to adjust the composition of the conditioned liquor to a composition expressible as the sum of two components -- (1) ANN (Al2O3.6HNO3.15H2O or Al(NO3)3.9H2O), and (2) The desired crystal product BAN or Wiseite (a) BAN (Al2O3.2HNO3.5H2O or Al(OH)2NO3.2.OH2O). or (b) Wiseite (Al2O3.2HNO3.4H2O or Al(OH)2NO3.1.5H2O) to precipitate large crystals of BAN; and (4) separating the large crystals.
(FR)Un procede de preparation de gros cristaux de nitrate d"aluminium basique (BAN) a partir d"une solution d"apport d"acide nitrique contenant Al2O3, comprend les etapes suivantes: (1) evaporation de l"eau et de l"acide nitrique de la solution dans une seule etape d"evaporation effectuee a une temperature entre 270 et 450 F environ et a une pression comprise entre la pression atmospherique environ et 60 psig environ pour produire une liqueur evaporee comprenant au moins 16% d"alumine en poids environ; (2) maintien de la liqueur evaporee dans des conditions de repos pendant une periode comprise entre 20 minutes environ et 2 heures environ a une temperature de 270 F a 350 F environ; (3) injection d"eau dans le produit de l"etape (2), l"eau etant ajoutee en une quantite suffisante pour ajuster la composition de la liqueur conditionnee en une composition pouvant s"exprimer sous forme de la somme des deux composants -- (1)ANN(Al2O3.6HNO3.15H2O ou Al(NO3)3.9H2O), et (2) le produit de cristaux desires BAN ou Wiseite (a) BAN (Al2O3.2HNO3.5H2O ou Al(OH)2NO3.2.OH2O), ou (b) Wiseite (Al2O3.2HNO3.4H2O ou Al(OH)2NO3.1.5H2O) pour precipiter de gros cristaux de BAN; et (4) separation des gros cristaux.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)