Abstract: In the purification of natural gas streams to remove mercury by adsorption procedures, environmental pollution is avoided by using a condenser in conjunction with the adsorption beds in a manner such that the mercury vapor contained in the purge gas used to regenerate the adsorption beds is covered entirely as a liquid rather than being vented from the purification system as mercury vapor.

Abstract: Mercury is often removed as an impurity from process fluid streams by adsorption in fixed beds using any of several well-known adsorbents having the ability to selectively adsorb mercury. It is also common to reintroduce this sequestered mercury into the environment by means of the spent gas used to periodically regenerate the fixed beds. A solution to this problem is provided by the present invention in which the mercury is removed from the process stream using at least two cyclically regenerated adsorption beds in combination with a condenser whereby upon regeneration of one bed, the regeneration stream effluent therefrom is treated in the condenser to recover the bulk of the mercury as liquid mercury and recycling the overhead from the condenser to another bed engaged in the adsorption-purification of fresh feedstock.

Abstract: Silicon is inserted into the crystal lattice of zeolites containing defect sites by reaction with SiCl.sub.4 in the presence of oxygen. It has been found that by initially dehydrating the starting zeolite and removing the hydroxyl groups existing in the crystal defect sites, the generation of HCl from the SiCl.sub.4 reagent is avoided along with the undesirable aluminum hydrolysis reactions between the HCl thus-generated and the zeolite framework. The prior dehydration and dehydroxylation makes the presence of oxygen essential to the silicon insertion.

Abstract: The light alcohol component of exhaust gases from such commercial operations as paint spraying booths and printing presses is found to be selectively adsorbed, even under high relative humidity conditions, to a surprisingly high degree using bonded high-silica zeolite agglomerates which have been calcined only once to remove the organic templating agent present in the as-synthesized form of the zeolite. Under certain conditions of alcohol concentration and relative humidity, the capacity of the once-calcined zeolite for alcohol adsorption is nearly twice as great as the same zeolite which has been calcined more than once at temperatures high enough to decompose and remove the organic moieties.

Abstract: Animal's coats are deodorized and optionally treated in other manners by the application thereto of a composition comprising a crystalline siliceous molecular sieve which has been at least partially activated with respect to organic molecular species and in which at least about 90 percent of the framework tetrahedral oxide units are SiO.sub.2 tetrahedra and which have a sorptive capacity for water at 25.degree. C. and 4.6 torr of less than 10 weight percent.

Abstract: Ground water which contains heavy metal ions and toxic volatile organic compounds is purified by passing an air stream through it to purge out the organic compounds, adsorbing the displaced organic compounds on a molecular sieve and destroying them using a strong oxidizing agent such as hydrogen peroxide. This procedure avoids having the heavy metal ions from the water collect on the molecular sieve which causes the destruction of the oxidizing agent.

Abstract: Hydrothermal treatment of silicoaluminophosphate molecular sieves at temperatures in excess of about 700.degree. C. for periods sufficient to destroy a large proportion of their acid sites while retaining at least 80 percent of their crystallinity is found to result in a catalyst for converting methanol to lower olefins having increased catalyst life, increased selectivity for C.sub.2 -C.sub.3 olefins and decreased selectivity for paraffin production than the untreated SAPO-n starting composition.

Abstract: A novel aluminosilicate zeolite molecular sieve, denominated LZ-276, having effective pore diameters in the small to medium size range and possibly being topologically related to zeolite Phi, is synthesized hydrothermally in the TEAOH-Na.sub.2 O--SiO.sub.2 --Al.sub.2 O.sub.3 --H.sub.2 O system at a temperature of from 100.degree. C. to 150.degree. C.

Abstract: Hydrothermal treatment of silicoaluminophosphate molecular-sieves at temperatures in excess of about 700.degree. C. for periods sufficient to destroy a large proportion of their acid sites while retaining at least 80 percent of their crystallinity is found to result in a catalyst for converting methanol to lower olefins having increased catalyst life, increased selectivity for C.sub.2 -C.sub.3 olefins and decreased selectivity for paraffin production than the untreated SAPO-n starting composition.

Abstract: Hydrocarbon conversion reactions are carried out over a catalyst composition containing forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents which have been modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution.

Abstract: Mercury is often removed as an impurity from process fluid streams by adsorption in fixed beds using any of several well-known adsorbents having the ability to selectively adsorb mercury. It is also common to reintroduce this sequestered mercury into the environment by means of the spent gas used to periodically regenerate the fixed beds. A solution to this problem is provided by the present invention in which the mercury is removed from the process stream using a large non-regenerated adsorption bed in combination with a periodically regenerated secondary adsorption bed, the mercury content of the latter being transferred to the former during the regeneration procedure.

Abstract: Novel catalyst compositions comprising a metal hydrogenation component and a modified form of zeolite Y are found to be highly effective in the hydrocarbon conversion processes carried out in the presence of added hydrogen and involving hydrogenation as an essential reaction mechanism. The modified form of zeolite Y is prepared from a starting zeolite Y which has been ammonium cation exchanged to lower the alkali metal content to less than 3.0 weight percent. The starting composition is then steamed at temperatures above about 550.degree. C. to reduce the unit cell dimension and then contacted with an aqueous ammonium ion solution having a pH below about 4 to increase the bulk Si/Al.sub.2 ratio to the range of about 6.5 to 20.

Abstract: The combination of a steam-stabilized form of zeolite Y, known in the art as Y-85, and a form of zeolite beta which has been modified to maximize the weak acid sites and minimize the strong acid sites, is found to be a uniquely effective acidic component of a hydrocracking catalyst for the production of gasoline. Both the catalyst composition and the hydrocracking process utilizing the catalyst are disclosed.

Abstract: A novel aluminosilicate zeolite, denominated LZ-277 is synthesized hydrothermally from aqueous gels in the Na.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 system and in the absence of an organic templating agent. The as-synthesized LZ-277 has a chemical composition on an anhydrous basis expressed in terms of molar oxide ratios of:1.0.+-.0.1 Na.sub.2 O:Al.sub.2 O.sub.3 :3-15 SiO.sub.2and has a low adsorptive capacity for SF.sub.6 compared with the prior known, and possibly topologically related, zeolite Phi.

Abstract: Zeolite LZ-202 and other zeolites synthesized in the absence of organic templating agents and having a crystal structure isotypic with the mineral mazzite are subjected to a three-step treatment to greatly increase their surface area, catalytic activity and adsorptive capacity for adsorbates having molecular dimensions as large as the SF.sub.6 molecule. The treatment steps involve an initial conventional NH.sub.4.sup.+ ion-exchange, steaming at temperatures in excess of 300.degree. C. and a low-pH NH.sub.4.sup.+ ion-exchange at pH values below 4.0.

Abstract: Treatment of human or animal hair for purposes of waving, straightening or softening using compositions containing thioglycolic acid compounds commonly leave an undesirable odor due to the presence of residual trace amounts of the thio compound. The compositions of the present invention contain siliceous crystalline molecular sieves either as the sole active ingredient or in combination with hair conditioners. When applied to hair containing conventional, acid or soft wave hair perming solutions, the molecular sieve constituent effectively adsorbs and holds the residual odor-causing thioglycolic acid compound so that its odor is reduced to below its olfactory detection level threshold.

Abstract: Lithium/alkaline earth metal X zeolites in which the lithium:alkaline earth metal equivalent ratio is from about 95:5 to about 50:50 and lithium/alkaline earth metal A zeolites in which the lithium:alkaline earth metal equivalent ratio is from about 10:90 to about 70:30 are useful for separating oxygen and nitrogen from mixtures because they combine high adsorption capacity with high thermal stability.

Abstract: The combination of a steam-stabilized form of zeolite Y, known in the art as Y-85, and a form of zeolite beta which has been modified to maximize the weak acid sites and minimize the strong acid sites, is found to be a uniquely effective acidic component of a hydrocracking catalyst for the production of gasoline. Both the catalyst composition and the hydrocracking process utilizing the catalyst are disclosed.

Abstract: A composition for the cosmetic treatment of human skin, particularly facial skin, to remove retention products from the skin surface and sebaceous follicles, is disclosed. The composition comprises a high-silica zeolite, the principal adsorbent constituent, dispersed in an aqueous medium using colloidal hectorite-type clays, a water soluble alkyl polyol preferably having from 2 to 6 hydroxyl groups, and most preferably a glycol such as propylene glycol, and an anti-microbial agent compatible with the high-silica zeolite.

Abstract: Forms of zeolite Omega synthesized by hydrothermal crystallization from reaction systems containing alkali metal cations and organic templating agents, modified by calcination in air, ion-exchange, steam calcination and treatment with a low-pH aqueous ammonium ion solution, are significantly improved with respect to surface area, catalytic activity and adsorption capacities for large molecular species.