Abstract: The present invention relates to zeolites X, most of the exchangeable sites of which are occupied by lithium and di- and/or trivalent cations, having an improved thermal stability and an improved crystallinity with respect to zeolites of the prior art with the same degree of exchange of lithium and of di- and/or trivalent cations. The zeolites of the present invention are particularly effective as adsorbents of the nitrogen present in various gas mixtures and are well suited to the noncryogenic separation of the gases of the air.

Abstract: Process for preparing zeolites of X type having an Si/Al atomic ratio of ≦1.5 and having exchangeable cations including lithium, trivalent and/or divalent ions, and optionally sodium, potassium, ammonium and/or hydronium ions, involves distributing starting zeolite in a series of receptacles, percolating a solution of at least one lithium compound through the series, drawing a lithium-containing bleed from first receptacle of the carrousel, and drawing off a final effluent stream from a final receptacle in the series. The effluent stream contains compounds of exchangeable cations from the starting zeolite and traces of the lithium compound(s). After a desired degree of lithium exchange has occurred in the first receptacle, the first receptacle is removed and a fresh solution of at least one lithium compound is introduced into the next receptable in the series and percolated through the series. This step can be performed for each receptacle in the series.

Abstract: The present invention relates to a process for the preparation of zeolites X and LSX agglomerated with a binder and for which approximately 50 to approximately 99% of the exchangeable sites are occupied by lithium ions, which consists in carrying out the exchange with lithium of a portion of the exchangeable cations of the starting zeolite by bringing the said zeolite, distributed in a carrousel of at least 2 receptacles in the stationary bed form which are arranged in series in an interchangeable manner, into contact with a solution of lithium compounds (1) conveyed through the-said carrousel whose sequence of receptacles is modified cyclically at given time intervals; when the desired degree of exchange with regard to lithium is achieved for the zeolite of the 1st receptacle, the latter is taken out of the carrousel and the zeolite which is present therein is freed from the solution of lithium compounds by washing, then discharged (4) and optionally replaced by a fresh charge of zeolite to be exchanged, and

Abstract: The present invention relates to zeolites X, most of the exchangeable sites of which are occupied by lithium and di- and/or trivalent cations, having an improved thermal stability and an improved crystallinity with respect to zeolites of the prior art with the same degree of exchange of lithium and of di- and/or trivalent cations.

Abstract: The performances of the industrial manufacture of LSX faujasite are improved by proceeding to the aging and the crystallization of the gel by stirring with a Archimedean screw stirrer. In particular, the duration of the aging is shortened considerably without affecting the crystallinity of the final product.

Abstract: Vinyl chloride monomer is selectively prepared by intimately contacting, in the absence of steam, a feedstream of 1,2-dichloroethane with a flow of fluid or solid particulates heated to such elevated temperature and for such minim period of time, e.g., 0.010 to 0.5 second, as to flash transfer a dehydrochlorinating amount of thermal energy to the 1,2-dichloroethane and thereby ultrapyrolyzing at least a fraction of same into vinyl chloride and HCl, and recovering the vinyl chloride from the medium of ultrapyrolysis.

Abstract: Water-containing mixtures of at least one hydrocarbon/halocarbon and hydrochloric acid, e.g., the methyl chloride feedstream in conventional process for the synthesis of chloromethanes, are desiccated by intimately contacting such mixtures with an effective drying amount of an essentially anhydrous drying agent that includes (i) a metal sulfate, chloride or perchlorate, or (ii) phosphorus pentoxide.

Abstract: Water-containing mixtures of at least one hydrocarbon/halocarbon and hydrochloric acid, e.g., the methyl chloride feedstream in conventional process for the synthesis of chloromethanes, are desiccated by intimately contacting such mixtures with an effective drying amount of an essentially anhydrous drying agent that includes (i) a metal sulfate, chloride or perchlorate, or (ii) phosphorus pentoxide.

Abstract: Apparatus for the production of higher chloromethanes, i.e, CH.sub.2 Cl.sub.2, CHCl.sub.3 and CCl.sub.4, by chlorinating methyl chloride with chlorine in a first reaction zone A, chlorinating at least one of the higher chloromethanes CH.sub.2 Cl.sub.2 and CHCl.sub.3 with chlorine in a parallel second reaction zone B, combining the reaction products from the first and second reaction zones A and B, separating higher chloromethanes from the combined reaction prodcuts, and recycling at least one of the separated higher chloromethanes CH.sub.2 Cl.sub.2 and CHCl.sub.3 as chlorination feed to the second reaction zone B.

Abstract: Free chlorine values are removed by radical chlorination from uncombined admixtures thereof, notably admixtures of free chlorine and at least one halogenated organic compound that is not completely chloro-substituted.

Abstract: A tube extends through a wall of a vessel and is adapted to carry an ultraviolet emitter for use with a photochemical reaction vessel. An end of the tube disposed outside of the vessel is mounted within a support which forms a ball joint for that end of the tube. That joint allows the tube to pivot slightly in response to forces acting on the portion of the tube disposed within the vessel, thereby resisting any breaking or bending of the tube which might otherwise occur. A lip seal is disposed around the tube at a location intermediate the ball joint and the vessel to prevent the escape of fluids from the vessel past the tube.

Abstract: Residual aqueous phases, emanating from the synthesis of methyl chloride by reacting methanol with hydrochloric acid, are conveniently demethanolized by maintaining same in liquid phase and in the absence of catalyst, at a temperature of from 50.degree. to 150.degree. C. and under a pressure of less than about 8 bars. The methanol recovered is in the form of a crude methyl chloride which is advantageously recycled to the CH.sub.3 OH/HCl reaction zone.

Abstract: The higher chloromethanes, i.e., CH.sub.2 Cl.sub.2, CHCl.sub.3 and CCl.sub.4, are simultaneously produced by chlorinating methyl chloride with chlorine in a first reaction zone A, chlorinating at least one of the higher chloromethanes CH.sub.2 Cl.sub.2 and CHCl.sub.3 with chlorine in a parallel second reaction zone B, combining the reaction products from said first and said second reaction zones A and B, separating higher chloromethanes from said combined reaction products, and recycling at least one of said separated higher chloromethanes CH.sub.2 Cl.sub.2 and CHCl.sub.3 as chlorination feed to said second reaction zone B.

Abstract: The higher chloroalkanes, advantageously the higher chloromethanes, are continuously produced from at least one lesser chloroalkane, by (i) continuously introducing chlorine and said at least one lesser chloroalkane into a stream of reaction medium continuously and essentially autogenously recirculating in a loop circuit which comprises an essentially vertical principal reaction zone, (ii) continuously chlorinating said at least one lesser chloroalkane in said essentially vertical principal reaction zone, and (iii) continuously withdrawing higher chloroalkane product from said stream of essentially autogenously recirculating reaction medium.