Rhone-poulenc Industries

Rhone-poulenc Specialites Chimiques

Rhone-poulenc Specialties Chimiques

Rhone-poulenc Chimie

Rhone-poulenc Chimie De Base

Bertrand Latourrette

Claude Magnier

Claude Fouassier

Claire Gourlaouen

Anne Tugaye

Francoise Deneuve

Claire David

Thierry Dupin

Regis Poisson

Patrice Nortier

Pierre Canard

Gilbert Schorsch

Patrick Dougier

Alain Garcia

Anne Menesguen

A neodymium hydroxynitrate, readily calcined into, e.g., neodymium oxide, Nd.sub.2 O.sub.3, has the formula (I):

Neodymium hydroxynitrate

Zeolites of type ZSM-5, well suited as absorbents/catalysts, are facilely prepared by (i) intimately admixing a source of alumina with a source of silica, in aqueous reaction medium having a pH ranging from 1 to 7 and wherein the molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 ranges from 5 to 100, (ii) adding a source of alkali metal oxide to the reaction mixture resulting from said stage (i), said combined reaction mixture having a pH ranging from 8 to 12, and thence (iii) crystallizing a zeolite of type ZSM-5 therefrom.

Preparation of zeolites of type ZSM-5

Morphologically improved ceric oxide particulates have a BET specific surface, measured after calcination at a temperature of from 350.degree. to 450.degree. C., of at least 100 m.sup.2 /g, a total pore volume of at least 0.3 cm.sup.3 /g, and the pores of which having a mean diameter larger than 50 .ANG.. The improved ceric oxide particulates are prepared by reacting a cerium salt with a strong base in the presence of carboxylate ions, or a cerium carboxylate with a strong base; separating the precipitate of true cerium hydroxide thus produced; and washing, heat-treating, and calcining such precipitate.

Novel ceric oxide particulates and process of making

Durable, aging-resistant alumina-based catalyst carriers having improved mechanical strength are facilely prepared by (i) impregnating an alumina-based catalyst carrier with an aqueous solution of a quaternary ammonium silicate, (ii) drying said impregnated carrier, and (iii) calcining said dried carrier.

Alumina-based catalyst carriers having improved durability/mechanical

A novel neodymium hydroxy/ammonium nitrate, readily calcined into, e.g., neodymium oxide, Nd.sub.2 O.sub.3, has the formula (I):

Neodymium hydroxy/ammonium nitrate

Zeolites well suited for detergency, e.g., zeolites of type A, are adopted for mass production by simultaneously continuously introducing both an aqueous solution of sodium silicate and an aqueous solution of sodium aluminate into an unagitated first reaction zone to effect the continuous intimate admixture thereof, continuously transferring intimate admixture from said first reaction zone to a second zone of gelation to effect the continuous homogeneous gelling thereof, the time of retention of said intimate admixture in said first reaction zone being less than that period of time required for the gelation thereof, and thence effecting crystallization of a zeolite from said homogeneous gel.

Preparation of zeolites 4A and/or 13X

Type Y zeolites were adopted as, e.g., catalysts and adsorbents, are facilely prepared by (i) intimately admixing, at essentially ambient temperature, an aqueous solution of a water-soluble aluminum compound with an aqueous solution of sodium silicate as to prepare a reaction mixture solution or sol therefrom, (ii) next heating said reaction mixture solution or sol to a temperature of crystallization, ranging from about 50.degree. to 120.degree. C., by heat exchange within such rapid period of time as to avoid any phase conversion thereof, but whereafter said reaction mixture solution or sol transforms essentially immediately into a gel, and (iii) thence maintaining the resulting gel at such crystallization temperature until Type Y zeolite crystals are crystallized therefrom.

Preparation of type Y zeolites

High impact strength, improved bending modulus composites are comprised of a polymeric matrix, e.g., elastomer or synthetic polymer of polypropylene or polyamide type, said matrix having highly dispersed therein a reinforcing amount of relatively small synthetic zeolitic filler particulates, e.g., of types A, 4A and Na-P, and the mean size of the elementary particles thereof advantageously closely approximating those of the secondary particles.

Polymeric matrices reinforced with highly dispersed synthetic zeolitic

Hydrated strontium fluosilicates activated with divalent europium, having the formula:

Novel black light emitting luminophors

Luminophors which luminesce in the blue region of the spectrum have the formula:

Growing community of inventors

Le Raincy, France

Bertrand Latourrette