摘要:
The invention relates to a process for the separation of at least one gas from a mixture containing at least two gases, which process comprises contacting a pore containing molecular sieve with the mixture of gaseous components, selectively adsorbing at least one component of the mixture in the pores of the molecular sieve, separating the molecular sieve from the non-adsorbed component or components and optionally desorbing the adsorbed component or components, the molecular sieve having been modified with a modifying agent containing at least one weak acid, a salt of a weak acid, or a derivative of a weak acid of at least one element of the Groups III, IV and V of the Periodic Table of Elements.
摘要:
Process for introduction of silicon atoms instead of aluminum atoms in the crystal lattice of a zeolite of the faujasite type with a halosilane at temperatures lower than 150.degree. C., then washing. The resulting zeolites are particularly suitable for the conversion of hydrocarbons, above all for cracking. They are distinguished by their ultrastability and good activity.
摘要:
The useful storage life of a clear solution of seeds used to initiate the crystallization of zeolite in porous microspheres of calcined clay is increased by adding sodium silicate solution to a matured seed solution.
摘要:
The present invention relates to a process for producing a crystalline synthetic faujasite of the zeolite Y type wherein a relatively small amount of a zeolite Y seed is thoroughly mixed with sodium silicate at ambient temperature to form an activated sodium silicate system and to such activated system, sodium aluminate is added at ambient temperature. The mixture is then heated and reacted with stirring until the desired cyrstalline product is formed. Zeolite Y is filtered out and then dried.
摘要:
The present invention relates to a process for producing a crystalline synthetic faujasite of the zeolite "Y" type wherein an activated system is provided by mixing a sodium silicate solution with a seed amount of zeolite "Y" type synthetic faujasite and the activated system is reacted with a sodium aluminate solution under controlled conditions to thereby form a low water reaction mixture or system and then a crystalline synthetic faujasite of the zeolite "Y" type.
摘要:
Disclosed is an abrasion-resistant granular zeolite formed from a mixture of a synthetic zeolite and a clay binder, said granular zeolite comprising a core composed of a synthetic zeolite clay binder mixture containing the synthetic zeolite at a content higher than the average synthetic zeolite content in the granular zeolite and a shell composed of a synthetic zeolite-clay binder mixture containing the clay binder at a content higher than the average clay binder content in the granular zeolite.This granular zeolite is excellent in both the zeolitic characteristics such as adsorbability and ion exchange capacity and the mechanical strength characteristics such as abrasion resistance and compression strength.
摘要:
Zeolite agglomerates in which the distribution of capillary pores is modified to enhance the number of pores in the diameter range of from 2 to 100 microns are found to have a greatly improved ability to release adsorbed CO.sub.2 into liquid media in a manner which favors both a high rate of desorption and a high degree of solubility of the desorbate gases in the liquid media. The agglomerates are particularly useful for the carbonation of an aqueous medium.
摘要:
There are provided alkali aluminum silicates having a hydrophilic surface. They are prepared by mixing a crystalline, ion-exchanging alkali aluminum silicate with a hydrophilic material, preferably ortho-phosphoric acid or an alkali ortho phosphate.
摘要:
Reactive amorphous silica having properties suitable for use in the hydrothermal synthesis of zeolite Y is prepared by chemical precipitation of the silica from the waste liquor from a prior zeolite Y synthesis and is employed as a silica source in a subsequent zeolite Y synthesis.
摘要:
ZEOLITES OF THE Y CRYSTAL TYPE ARE PRODUCED BY DIGESTING AN QUEOUS REACTION MIXTURE COMPRISING SILICAL GEL SYNERIZED AT A PH BETWEEN ABOUT 5.5 AND 10, PREFERABLY BETWEEN ABOUT 6 AND 9, AND SODIUM ALUMINATE AT AN ELEVATED TEMPERATURE. THE PARTICULAR SILICA GEL EMPLOYED PERMITS THE PRODUCTION OF GOOD YIELDS OF Y-TYPE ZEOLITES HAVING A SILICA TO ALUMINA MOLE RATIO OF ABOVE 3.9 UNDER MILDLY ALKALINE CONDITIONS HERETOFORE CONSIDERED POSSIBLE ONLY IN CONJUNCTION WITH SILICA HYDROSOLS AND REACTIVE AMORPHOUS SOLID SILICAS.