Composite polybasic salt, process for producing the same,...

C - Chemistry – Metallurgy – 01 – F

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C01F 7/00 (2006.01) B01J 41/08 (2006.01) B01J 41/10 (2006.01) C01B 13/36 (2006.01) C01B 25/45 (2006.01) C01B 33/38 (2006.01) C01G 1/00 (2006.01) C07C 51/41 (2006.01) C07C 53/126 (2006.01) C08K 3/18 (2006.01) C08K 3/22 (2006.01) C08K 5/098 (2006.01) C09K 5/14 (2006.01) C09K 21/02 (2006.01)

Patent

CA 2343730

A composite-metal polybasic salt which has a chemical composition represented by the following general formula (1) M3+pMgq(OH)y(A)z. nH2O [wherein M3+ represents a trivalent metal; A represents an anion; 3p+2q-y-mz=0 (m is the valence of A), 0.3 <= q / p <= 2.5, 1.5 <= y / ( p + q ) <= 3.0, and 4.0 <= ( p + q ) / z = 20.0; and n is 7 or smaller], has specific X-ray diffraction peaks, and has a degree of orientation I0 of 1.5 or higher. The composite- metal polybasic salt has anion-exchanging properties and is useful by itself as an anion exchanger. An anion suitable for the intended application can be incorporated into the salt. The salt is produced by reacting a water-soluble salt of a trivalent metal with magnesium oxide or hydroxide or with a water- soluble salt of magnesium at a pH of 6.0 to 9.0 and a temperature of 50~C or higher and optionally conducting ion exchange in the presence of an acid or a soluble salt of an acid.

Cette invention se rapporte à un sel polybasique de métal composite, qui possède une composition chimique représentée par la formule générale: M?3+¿¿p?Mg¿q?(OH)¿y?(A)¿z?.nH¿2?O (1) [où M?3+¿ représente un métal trivalent; A représente un anion; 3p+2q-y-mz=0 (m représente la valence de A), 0,3 <= q / p <= 2,5, 1,5 <= y / (p + q) <= 3,0, et 4,0 <= (p + q) / z <= 20,0; et n est égal ou inférieur à 7]. Ce sel comporte des crêtes de diffraction des rayons X spécifiques et un degré d'orientation I¿0? égal ou supérieur à 1,5. Ce sel polybasique de métal composite possède des propriétés d'échange d'anions et il peut servir en tant que tel comme échangeur d'anions. Un anion approprié à l'application souhaitée peut être incorporé dans ce sel. On produit ce sel en faisant réagir un sel hydrosoluble d'un métal trivalent avec de l'oxyde ou de l'hydroxyde de magnésium ou avec un sel hydrosoluble de magnésium, à un pH de 6,0 à 9,0 et à une température de 50 ·C ou plus, et en effectuant éventuellement un échange ionique en présence d'un acide ou d'un sel soluble d'un acide.

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