Abstract: A novel crystalline silica composition having uniform pore dimensions of approximately 6 Angstrom units is prepared by calcining a crystalline hydrated alkylonium silicate prepared hydrothermally from a reaction mixture containing as essential reagents, water, amorphous silica and a quaternary ammonium compound at a pH of at least 10. The crystalline silica, because of its uniform pore structure, is capable of making size-selective separations of molecular species, but neither it nor its silicate precursor exhibit ion-exchange properties.This absorbent has a very useful hydrophobic/organophilic characteristic which permits its use in selectively adsorbing organic materials from water, either in liquid or vapor phase.

Abstract: The Cu.sup.+.sup.+ cations of highly siliceous zeolites are found to undergo spontaneous reduction to Cu.sup.+ cations upon dehydration and to produce oxygen by oxidation of water.

Abstract: Superparamagnetic wax compositions useful in magnetic levitation separations of particle mixture based on density differences are provided which have the ability to withstand without phase separation repeated melt-freeze cycling. The stability is obtained by using a mixture of hydrocarbon and oxygenated waxes.

Abstract: Hydrocarbon gas streams containing small quantities of molecular oxygen are found to adversely affect the adsorptive characteristics of zeolite adsorbent beds at temperatures above 350.degree. F. Problem is avoided by converting the oxygen to readily sorbable compounds prior to contacting the bed with the gas stream.

Abstract: Zeolitic molecular sieves having high SiO.sub.2 /Al.sub.2 O.sub.3 molar ratios and containing Ag.sup.+ cations are found to exhibit a high degree of selectivity and affinity for CO molecules and are capable of separating CO from gas streams even when water vapor is present.

Abstract: Zeolitic molecular sieves having high SiO.sub.2 /Al.sub.2 O.sub.3 molar ratios and containing Cu.sup.+ cations are found to exhibit a high degree of selectivity and affinity for CO molecules and are capable of separating CO from gas streams even when water vapor is present.

Abstract: In the prevention of atmospheric pollution by sulfur dioxide emissions from acid absorbers in contact process sulfuric acid plants in which the unconverted SO.sub.2 is accumulated by adsorption in a zeolite adsorbent bed and desorbed back into the acid production system, it is found that ambient moist air, after partial dehydration in an acid scrubber is suitably used both to cool down and hot purge desorb the zeolite beds. In addition the pure water derived from the ambient air is advantageously used in the acid-making system.

Abstract: Molecular sieve catalyst compositions having decreased catalytic activity as a result of accumulating more than 2 weight-% carbonaceous coke deposits are restored essentially to their pre-coked activity by heating an essentially homogeneous mixture of particles thereof with particles of an inert refractory material in the weight ratio of from 1:2 to 1:10 in air at a temperature of from 500.degree. C. to 725.degree. C. for a period of time sufficient to decrease the carbonaceous coke to less than two weight percent.

Abstract: Dehydration of hydrated crystalline zeolites containing trivalent metal cations results in the concurrent reduction of the trivalent cation to the bivalent state and the evolution of oxygen. Rehydration of the zeolite produces free hydrogen and oxidizes the bivalent metal cations to their initial trivalent state. A cyclic operation of the two procedures is advantageously employed.

Abstract: The sulfur trioxide, sulfuric acid vapor and sulfuric acid mist content of the effluent gas stream from a contact process sulfuric acid absorber are substantially decreased by pre-treating the gas stream prior to its passage through a conventional mist eliminator. The treatment steps include cooling the absorber effluent to below 100.degree.F and contacting same with aqueous sulfuric acid in a particular concentration range and thereafter maintaining the gas phase in the mist eliminator saturated with respect to H.sub.2 SO.sub.4 vapor.