Engelhard Corporation

Valerie A Bell

Steven M Kuznicki

Jacqueline S Curran

Tadeusz W Langner

Ivan Petrovic

Richard M Jacubinas

Patrick W Blosser

Bipin T Desai

Novel morphologies are provided for aluminosilicate zeolite ion-exchange materials useful for static water softening. The zeolites are provided in the form of large aggregates composed of submicron zeolite crystals. Rapid exchange rates, high hardness ion capacity and increased attrition resistance characterize the zeolite ion exchangers.

Macroscopic aggregates of microcrystalline zeolites for static water softening applications

A method of water softening utilizes macrocrystalline aggregates consisting essentially of submicron crystals of aluminosilicate zeolite. The aggregates have a size of greater than 5 microns and are used in a static bed water softening device. Both regenerable and disposable water softening materials can be provided.

Method of static water softening using zeolites of novel morphology

Separation of ethylene from ethane is achieved by feeding a mixture of the C hydrocarbons in contact with a CTS-1 crystalline titanium silicate molecular sieve which has a controlled pore size to selectively adsorb ethylene and size exclude ethane. The feed stream can also contain acetylene which can be selectively adsorbed from both ethane and ethylene by further controlling the pore size of the CTS-1 molecular sieve. Propane/propylene separation is also disclosed.

Olefin separations employing CTS molecular sieves

This invention relates to zeolitic molecular sieve compositions and hybrid zeolite-silica compositions characterized by novel morphology in which the zeolite is present as macroscopic aggregates of microcrystalline zeolite. The zeolitic compositions of this invention have outstanding capability to complex multivalent cations, especially calcium due to the high exchange kinetics of the microcrystalline zeolite component and yet have the ease of handling due to the macroscopic aggregate assemblage.

Macroscopic aggregates of microcrystalline zeolites

Aluminosilicate zeolites are formed in a novel reaction medium which contains a silicate source and an aluminum source in an aqueous alkaline solution and which reaction medium further includes an additional electrolyte salt. The addition of the electrolyte salt provides nucleation sites for the zeolite so as to form very small crystals. In high silica reaction environments, it is possible to form high aluminum zeolites which contain occluded silicate and wherein the morphology of the zeolites comprise macroscopic aggregates of microcrystalline zeolites. The addition of the electrolyte salt can also decrease the reaction time or temperature needed for crystallization.

Method of forming aluminosilicate zeolites

The present invention relates to a method of forming an aluminosilicate zeolite having a Si/Al&lE;1.1. The method comprises forming a reaction mixture by mixing a source of silica, and a source of aluminum in an aqueous alkaline solution having a pH of at least 12.0, wherein the Si/Al of said mixture is greater than 1.0.

Method of forming high aluminum aluminosilicate zeolites

Porous titanium silicate molecular sieves are produced in the form of a membrane capable of separating fluid molecular mixtures.

Geometric separation processes involving modified CTS membranes

Sodalite is treated with acid to transform the surface to provide a highly macroporous material that demonstrates water swing capacities exceeding those of high performance, low temperature desiccants under high latent load at relatively high ambient temperature and humidities.

Macroporaus aluminosilicate desiccant, preparation from sodalite and use in enthalpy energy wheels

Aqueous streams containing organic and/or inorganic contaminants are purified by the removal of the contaminant by contacting the aqueous stream with a membrane formed from a porous, crystalline titanium silicate.

Water purification using titanium silicate membranes

Novel gas separation agents with precisely and predictably controlled pore sizes within the range of 3-4 Angstrom units and their preparation from ETS-4 by exchange with cations, particularly multivalent cations such as strontium followed by drying and calcination to effect controlled pore shrinkage is disclosed. These novel materials have utility in gas separation processes particularly the separation of nitrogen from a mixture of the same with methane.

Small-pored crystalline titanium molecular sieve zeolites and their use

Barium-exchanged ETS-4 shows particular utility in gas separation processes involving the separation of nitrogen from a mixture of the same with methane.

Separation of nitrogen from mixtures thereof with methane utilizing

This invention relates to zeolitic molecular sieve compositions characterized by outstanding capability to complex multivalent cations, especially calcium. In particular, the invention relates to novel zeolitic molecular sieve compositions, especially those based on molecular sieves having a high alumina-to-silica ratio, in which crystals of the zeolite are modified by the inclusion of occluded silicate.

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Edison, NJ, United States of America

Valerie A Bell