Abstract: Methods are provided for regenerating a zeolitic molecular sieve having a sulfur-containing carbonaceous material deposited thereon by contacting the zeolitic molecular sieve with an oxygen-containing regeneration feed gas to remove at least a portion of the carbonaceous deposit material and thereafter absorbing sulfur oxides present in the regeneration gas using soda-lime absorbent. The methods can inhibit the deactivation of zeolitic molecular sieves by avoiding contact thereof with the sulfur oxides. In a specific aspect of the present invention, the regeneration method is incorporated into a method for separating normal paraffins from a sulfur-containing hydrocarbon feed in the gas oil or kerosene carbon range.

Abstract: A process for catalytically converting a feedstock into a product which comprises:(a) contacting the feedstock with a fluidized mass of solid particles comprising crystalline microporous three dimensional solid catalyst in a reaction zone at conditions effective to convert the feedstock into the product;(b) contacting the particles in the reaction zone with a first purge medium to reduce the amount of at least one of the feedstock and the product in contact with the particles; and(c) contacting the particles in the reaction zone with regeneration medium at conditions effective to improve at least one catalytic property of the catalyst, provided that steps (a), (b) and (c) are repeated periodically.

Abstract: A novel alkanolamine gas treating composition and method for purifying a gas stream containing acid gas impurities. The composition consists essentially of an alkanolamine solvent in an aqueous solution with antimony wherein said alkanolamine solvent includes at least about 1% by weight of methydiethanolamine (MDEA) and at least about 5% monoethanolamine (MEA) by weight of the total solution, and with said antimony present in a concentration of at least about 100 ppm. The combination of antimony and MDEA inhibits corrosion and retards solvent degradation.

Abstract: Gases having molecular dimensions equal to or smaller than nitrogen are selectively adsorbed and separated from other gases having molecular dimensions equal to or larger than methane using a clinoptilolite molecular sieve that contains magnesium cations. The clinoptilolite molecular sieves of the present invention can be ion-exchanged with magnesium cations and optionally with other cations such as lithium, sodium, potassium, calcium, barium, strontium, zinc, copper, cobalt, iron and manganese to produce the desired separation characteristics. Processes are disclosed for separating gases by adsorbing at an elevated pressure and regenerating, or desorbing, by reducing the pressure. Methods for the preparation of a magnesium-exchanged clinoptilolite are disclosed.

Abstract: Adsorption processes are provided for separating a first component from a mixture with at least one other component by passing the mixture in vapor phase through a first adsorption zone comprising particulate adsorbent material having a minimum particle size and subsequently through a second adsorption zone comprising particulate adsorbent having a maximum particle size smaller than the particle size of the adsorbent in the first adsorption zone. In certain aspects of the invention wherein the process has a repetitive cycle sequence and a total cycle time of greater than about 30 seconds, the particle size of the adsorbent in the first adsorption zone is not less than about No. 14 mesh and the particle size of the adsorbent in the second adsorption zone is less than about No. 14 mesh. One specific aspect relates to the separation of hydrogen from a feed comprising hydrogen and at least one other component selected from the group consisting of carbon monoxide, methane and nitrogen by a pressure swing process.

Abstract: A process for the removal of carbon dioxide, hydrogen sulfide and alkyl mercaptans from a hydrocarbon-containing feed gas:(a) contacting the feed gas with an adsorbent capable of removing hydrogen sulfide and alkyl mercaptans from the feed gas at effective conditions to produce a treated gas having reduced concentrations of hydrogen sulfide alkyl mercaptans;(b) contacting the treated gas with a liquid medium capable of removing carbon dioxide hydrogen sulfide and alkyl mercaptans from the treated gas at effective conditions to produce a product gas having reduced concentrations of carbon dioxide hydrogen sulfide and alkyl mercaptans;(c) contacting a spent absorbent laden with hydrogen sulfide and alkyl mercaptans with a normally liquid fraction at effective desorption conditions to produce a regenerated adsorbent and a regeneration effluent having increased concentrations of hydrogen sulfide and alkyl mercaptans; and(d) utilizing the regenerated adsorbent as at least a portion of the adsorbent in step (a).

Abstract: This invention relates to processes for separating by adsorption lower octane normal and mono-methyl paraffins from hydrocarbon feeds containing normal, mono-methyl and more highly branched paraffin fractions and isomerizing the normal and mono-methyl paraffins to produce higher octane isopentane and more highly branched paraffins. Adsorbents capable of adsorbing both normal and mono-methyl paraffins are used either alone or in combination with adsorbents capable of adsorbing normal paraffins but not mono-methyl paraffins. Isopentane, although adsorbed along with the mono-methyl paraffins, is preferentially eluted from the adsorber and recovered as an adsorption effluent.

Abstract: A process for converting a feedstock containing 1 to about 6 carbon atoms per molecule which includes (a) contacting the feedstock with a solid composition comprising a crystalline microporous three dimensional solid catalyst having pores and being capable of promoting the conversion, and matrix material at conditions effective to convert the feedstock, to produce at least one desired product, and to at least partially deactivate the solid composition; (b) contacting the deactivated solid composition with regeneration medium at conditions to at least partially regenerate the solid composition; and (c) repeating step (a), the improvement which comprises (d) contacting the regenerated solid composition prior to step (c) to condition the regenerated solid composition to have increased effectiveness in step (c).

Abstract: A process for producing olefins comprising:(a) contacting hydrogen and at least one carbon oxide in a first reaction zone at conditions effective to chemically react the hydrogen and carbon oxide and produce at least one product, e.g., methanol, in the effluent of the first reaction zone;(b) contacting the effluent containing the product in a second reaction zone at conditions effective to chemically react the product and produce olefins in the effluent of the second reaction zone;(c) recovering an olefin-enriched product from the effluent of the second reaction zone; and(d) subjecting at least one of hydrogen and at least one carbon oxide from the effluent of the second reaction zone to step (a).

Abstract: A process for the purification of a gas stream containing impurities comprising (i) passing the gas stream through an aqueous solution of stabilized monoethanolamine or diethanolamine in such a manner that the impurities are absorbed into the monoethanolamine solution or diethanolamine solution to form a rich solution and (ii) regenerating the monoethanolamine or diethanolamine solvent from the rich solution so as to remove the impurities, (iii) recycling the solvent into the aqueous solution in a closed loop and introducing a stabilizer into the recirculating solvent solution in an amount of about 4 to about 25 percent by weight based on the total weight of solution, the stabilizer being methyldiethanolamine.