Process for the manufacture of porous and permeable inorganic membranes

Abstract

Abstract Translated from French LE PRESENT CERTIFICAT D'ADDITION A POUR OBJET DES PERFECTIONNEMENTS AU PROCEDE DE FABRICATION DE MEMBRANES MINERALES POREUSES ET PERMEABLES, DECRIT DANS LE BREVET PRINCIPAL, QUI CONSISTE A DEPOSER SUR UN SUBSTRAT POREUX ET PERMEABLE, UNE COUCHE MINCE D'UN GEL PEPTISE CONTENANT AU MOINS DE L'HYDROXYDE D'ALUMINIUM, A SECHER LA MEMBRANE AINSI OBTENUE ET A LA SOUMETTRE A UNE CUISSON A UNE TEMPERATURE COMPRISE ENTRE 500 ET 1 100C. SELON CE PERFECTIONNEMENT, ON PREPARE LE GEL PEPTISE PAR UN PROCEDE COMPRENANT UNE ETAPE DE PRECIPITATION D'HYDROXYDE D'ALUMINIUM ET UNE ETAPE DE PEPTISATION DU PRECIPITE POUR LE TRANSFORMER EN PARTICULES COLLOIDALES, ET ON APPLIQUE EN CONTINU DE L'ENERGIE, PAR EXEMPLE DE L'ENERGIE ULTRASONORE, AU MILIEU REACTIONNEL PENDANT L'ETAPE DE PRECIPITATION DE L'HYDROXYDE D'ALUMINIUM ETOU PENDANT L'ETAPE DE PEPTISATION. THE SUBJECT OF THIS CERTIFICATE OF ADDITION IS TO IMPROVE THE PROCESS FOR MANUFACTURING POROUS AND PERMEABLE MINERAL MEMBRANES, DESCRIBED IN THE MAIN PATENT, WHICH CONSISTS OF DEPOSITING ON A POROUS AND PERMEABLE SUBSTRATE, A THIN LAYER CONTAINING A PEPTINE GEL OF ALUMINUM HYDROXIDE, TO DRY THE MEMBRANE SO OBTAINED AND TO SUBJECT IT TO BAKING AT A TEMPERATURE BETWEEN 500 AND 1100C. ACCORDING TO THIS PERFECTION, THE PEPTISE GEL IS PREPARED BY A PROCESS INCLUDING A STEP OF PRECIPITATION OF ALUMINUM HYDROXIDE AND A STEP OF PEPTIZING THE PRECIPITE TO TRANSFORM IT INTO COLLOIDAL PARTICLES, AND ENERGY IS CONTINUOUSLY APPLIED, ULTRASONIC ENERGY, IN THE REACTIONAL MEDIUM DURING THE PRECIPITATION STAGE OF THE ALUMINUM HYDROXIDE AND OR DURING THE PEPTIZATION STAGE.

Inventors

• 👤 Michel Berardo
• 👤 Jean Charpin
• 👤 Jean-Marie Martinet

Bibliographic Details