Abstract: The invention concerns a gum carob with average mole weight (Mw) ranging between 2.5.105 and 1.5.106 g/mol and whereof at least 60 wt. % of said gum is soluble in an aqueous medium at a temperature not higher than 60° C.

Abstract: The invention concerns a gum carob with average mole weight (Mw) ranging between 2.5.105 and 1.5.106 g/mol and whereof at least 60 wt. % of said gum is soluble in an aqueous medium at a temperature not higher than 60° C.

Abstract: The invention concerns a method for preparing a hydrocolloid powder composition exhibiting good dispersibility in an aqueous medium, without formation of lumps, and whereof the hydration time is controllable, comprising steps which consist in: preparing a potentially reactive crosslinking powder by contacting a highly absorbent support powder with a crosslinking agent capable of crosslinking a hydrocolloid powder, optionally under effect of heat; mixing, optionally by dry process, said powder with a hydrocolloid powder; optionally treating said mixture of powders with water optionally containing salts; and optionally heat-treating said mixture of powders. The invention also concerns said hydrocolloid powder composition comprising at least a crosslinked hydrocolloid constituent, a residual amount of crosslinking agent less than 1000 ppm, a support powder and optionally water.

Abstract: Crystalline 4A zeolites having high calcium ion exchange capacity, well adapted as builder materials for detergent compositions, are prepared by directly admixing an aqueous sodium silicate solution with a first aqueous sodium aluminate solution in a first reaction vessel to form a hydrogel therefrom, and transferring the hydrogel thus formed to a discrete crystallization zone and therein contacting such hydrogel with a crystallization-effecting amount of a second aqueous sodium aluminate solution to convert same into a crystalline 4A zeolite, and, advantageously, filtering, washing and optionally drying such crystalline 4A zeolite.

Abstract: A process is provided for the preparation of zeolites belonging to the faujasite structural class and exhibiting a Si:Al ratio higher than 1 in which a reaction mixture is first produced, which has a pH higher than 10 and contains water, a source of tetravalent silicon, a source of trivalent aluminum, a source of hydroxide ions in the form of a strong inorganic or organic base and a structuring agent ST so as to produce an aluminosilicate gel having the desired composition to permit its crystallization into a compound of the faujasite structural class. The gel obtained is kept at a temperature, pressure and for a sufficient period to effect the crystallization of the gel into a precursor of the zeolite consisting of the zeolite trapping the structuring agent ST in its cavities and the precursor is then subjected to a calcination to destroy the structuring agent and to produce the zeolite.

Abstract: An aluminosilicate gel containing an ST structuring agent whose composition is suitable for crystallization into a zeolite of the faujasite structural family is prepared. The gel then undergoes crystallization in order to form a zeolite precursor which consists of the zeolite containing the ST structuring agent in its cavities and channels, the zeolite being produced through the calcination of the precursor. The ST structuring agent consists of at least one compound from the alkylene polyoxides of formula (1) ##STR1## in which R and R', identical or different, each represents H or an alkyl radical in C.sub.1 to C.sub.4, X designates H or OH, m is equal to 2 or 3 and can differ from one pattern to another, and n is a number from 1 to 12. The zeolites thus obtained have a Si:Al ratio which is greater than 1 and which can go beyond 3, and show a cubic symmetry. The zeolites can be used, directly or after cation exchange, as adsorbants or as catalyst constituents.

Abstract: A process is provided for the preparation of zeolites belonging to the faujasite structural class and exhibiting a Si:Al ratio higher than 1 in which a reaction mixture is first produced which has a pH higher than 10 and contains water, a source of tetravalent silicon, a source of trivalent aluminum, a source of hydroxide ions in the form of a strong inorganic or orgnaic base and a structuring agent ST so as to produce an aluminosilicate gel having the desired composition to permit its crystallization into a compound of the faujasite structural class. The gel obtained is kept at a temperature, pressure and for a sufficient period to effect the crystallization of the gel into a precursor of the zeolite consisting of the zeolite trapping the structuring agent ST in its cavities and the precursor is then subjected to a calcination to destroy the structuring agent and to produce the zeolite.