Abstract:
A reactor for catalyst preparation by treating a granular stock material with a reducing gas which comprises a reaction chamber made as a vertical tube whose cross-section is reduced in the direction of the stock material flow, a chamber for drying and thermally treating the stock material, a chamber for cooling the catalyst, and a chamber for passivating the catalyst. The reactor is provided with preheating and heat-exchange devices. The reactor construction allows the drying, reduction, cooling, and passivation of the catalyst to be carried out in one apparatus by a continuous method.
Abstract:
A DEACTIVATED HYDROCARBON CONVERSION CATALYST, WHICH IS A COMBINATION OF A PLATINUM GROUP COMPONENT, A RHENIUM COMPONENT, AND HALOGEN COMPONENT WITH A POROUS CARRIER MATERIAL AND WHICH HAS BEEN DEACTIVATED BY DEPOSITION OF CARBONACEOUS MATERIALS THEREON DURING A PREVIOUS CONTACTING WITH A HYDROCARBON CHARGE STOCK AT AN ELEVATED TEMPERATURE, IS REGENERATED BY THE SEQUENTIAL STEPS OF: (A) BURNING CARBON THEREFROM AT RELATIVELY LOW TEMPERATURE WITH A SUBSTANTIALLY SULFUR COMPOUND-FREE GAS STREAM CONTAINING H2O AND A RELATIVELY SMALL AMOUNT OF O2, (B) TREATING THE RESULTING PARTIALLY REGENERATED CATALYST AT A RELATIVELY HIGHER TEMPERATURE WITH A SUBSTANTIALLY SULFUR COMPOUND-FREE GAS STREAM CONTAINING A HALOGEN OR A HALOGEN-CONTAINING COMPOUND, H2O AND A RELATIVELY HIGHER AMOUNT OF O2, (C) PURGING O2 AND H2O FROM CONTACT WITH THE RESULTING CATALYST, AND (D) SUBJECTING THE RESULTING CATALYST TO CONTACT WITH A DRY AND SULFUR COMPOUND-FREE HYDROGEN STREAM. KEY FEATURES OF THE DISCLOSED METHOD ARE: (1) PRESENCE OF WATER IN THE GAS STREAMS USED IN ALL STEPS EXCEPT THE REDUCTION STEP; (2) CAREFUL CONTROL OF THE TEMPERATURE USED DURING EACH STEP; (3) ADJUSTMENT OF THE HALOGEN CONTENT OF THE CATALYST IMMEDIATELY AFTER THE CARBON-BURNING STEP AND PRIOR TO THE REDUCTION STEP; (4) CAREFUL CONTROL OVER THE COMPOSITION OF THE GAS STREAMS USED IN THE VARIOUS STEPS THEREOF; AND (5) EXCLUSION OF SULFUR COMPOUNDS FROM ALL GAS STREAMS UTILIZED.
Abstract:
Supported iridium-containing hydrocarbon conversion catalysts which are at least partially deactivated due to the deposition of carbonaceous residues thereon during contact with hydrocarbons are regenerated by contacting the residue-containing catalyst, prior to contact with oxygen at elevated temperature, with a chlorine-containing reagent to increase the catalyst chlorine content to a level in the range of from about 0.7 to 2.0 wt. %, based on anhydrous, carbonaceous residue-free catalyst, and thereafter contacting the catalyst with a substantially sulfur-free gaseous mixture containing oxygen at a temperature varying from about 775.degree. to 900.degree. F. for a time sufficient to burn at least a portion of the carbonaceous residue from the catalyst while maintaining at least 0.7 wt. % chlorine on the catalyst during contact with said gaseous mixture.
Abstract:
Supported iridium-containing hydrocarbon conversion catalysts which are at least partially deactivated due to the deposition of carbonaceous residues thereon during contact with hydrocarbons are regenerated by contacting the catalyst, prior to contact with oxygen at elevated temperature, with a chlorine-containing reagent to increase the catalyst chlorine content to at least 1.0 wt. %, based on anhydrous catalyst, and thereafter contacting the catalyst with a gaseous mixture containing oxygen, a chlorine containing reagent, and water at a temperature of about 750.degree. to 1000.degree.F. for a time sufficient to burn at least a portion of the carbonaceous residues from the catalyst.
Abstract:
A deactivated hydrocarbon conversion catalyst, which is a combination of catalytically effective amounts of a platinum group component, a Group IVA metallic component, and a halogen component with a porous carrier material and which has been deactivated by deposition of carbonaceous materials thereon during a previous contacting with a hydrocarbon charge stock at an elevated temperature, is regenerated by the sequential steps of: (a) burning carbon therefrom at a relatively low temperature with a substantially sulfur compound-free gas stream containing H2O and a relatively small amount of O2; (b) treating the resulting partially regenerated catalyst at a relatively higher temperature with a substantially sulfur compound-free gas stream containing a halogen or a halogen-containing compound, H2O and a relatively higher amount of O2; (c) purging O2 and H2O from contact with the resulting catalyst; and, (d) subjecting the resulting catalyst to contact with a dry and sulfur compound-free hydrogen stream. Key features of the disclosed method are: (1) presence of water in the gas stream used in all steps except the reduction step; (2) careful control of the temperature used during each step; (3) adjustment of the halogen content of the catalyst immediately after the carbon-burning step and prior to the reduction step; (4) careful control over the composition of the gas streams used in the various steps thereof; and, (5) exclusion of sulfur compounds from all gas streams utilized.
Abstract:
A deactivated hydrocarbon conversion catalyst, which is a combination of a platinum group component, a group IVA metallic component, and a halogen component with a porous carrier material and which has been deactivated by a deposition of carbonaceous materials thereon during a previous contacting with a hydrocarbon charge stock at an elevated temperature, is regenerated by the sequential steps of: (1) burning carbon therefrom at a relatively low temperature with a gas stream containing H2O and a small amount of O2, (2) treating with a gas stream containing H2O and a small amount of O2 at a relatively high temperature, (3) treating with a gas stream containing H2O and a large amount of O2 at the relatively high temperature, (4) treating with a gas stream containing halogen or a halogen-containing compound and water, (5) purging O2 and H2O from the resulting catalyst and (6) reducing with a dry hydrogen stream. Key features of the resulting method are: (1) presence of water in the gas streams used in all steps except the purging and reduction steps, (2) careful control of the inlet temperature used during each step, (3) adjustment of halogen content of the catalyst after the carbon-burning step and prior to the reduction step, (4) careful control over the composition of the gas streams used in the various steps thereof and (5) exclusion of sulfur compounds from all gas streams utilized.
Abstract:
SILICEOUS ZEOLITE CATALYSTS COMPRISING ZEOLITE MONOAND/OR DIVALENT METAL CATIONS AND A NON-ZEOLITIC GROUP VIII METAL HYDROGENATING COMPONENT SUPPORTED THEREON, WHICH CATALYSTS HAVE UNDERGONE DAMAGE BY THERMAL AND/ OR HYDROTHERMAL STRESSES RESULTING IN A MALDISTRIBUTION OF THE METAL COMPONENTS, ARE REJUVENATED IN ACTIVITY BY A SEQUENTIAL TREATMENT WITH AN AQUEOUS AMMONIUM SALT TO EXCHANGE OUT AT LEAST A PORTION OF THE ZEOLITIC MONOAND/OR DIVALENT METAL IONS, AND WITH AQUEOUS AMMONIA TO EFFECT A REDISTRIBUTION OF THE GROUP VIII METAL. THE TREATMENTS MAY BE PERFORMED IN EITHER ORDER.
Abstract:
THE ACTIVITY AND STABILITY OF A DEACTIVATED REFORMING CATALYST CONTAINING A PLATINUM GROUP METAL AND RHENIUM ARE RESTORED TO THAT OF FRESH CATALYST BY (1) REMOVING SUBSTANTIALLY ALL CARBON FROM THE CATALYST; (2) CONTACTING THE CATALYST AT ABOUT 900* F. WITH A NON-REDUCING GAS CONTAINING HALOGEN, STEAM AND OXYGEN UNTIL ABOUT 85% WT. OF THE DESIRED HALIDE CONTENT IS ADDED; (3) DISCONTINUING THE USE OF STEAM AND OXYGEN FROM THE LAST-MENTIONED STEP UNTIL THE HALOGENATION IS COMPLETED; AND (4) DRYING AND REDUCING THE CATALYST WITH A HYDROGEN-CONTAINING GAS; THEN REUSING THE CATALYST IN A REFORMING PROCESS. PREFERABLY, THE CATALYST IS HALOGENATED TO A LEVEL ABOUT 20% GREATER THEN THAT OF FRESH CATALYST. IT IS ALSO PREFERRED THAT THE CATALYST THEN BE DRIED WITH A NON-REDUCING GAS AT ABOUT 900* F. UNTIL THE WATER CONTENT IN THE EXIT GAS IS BELOW 150 P.P.M.V. FOLLOWED BY REDUCING THE METALLIC OXIDES BY CONTACT WITH A HYDROGEN-CONTAINING GAS AT 700-900* F.
Abstract:
A protective product for treating fresh concrete or mortar. The products are a mixture of (a) an aqueous dispersion A of a film-forming synthetic polymer (the synthetic polymer is compatible with fresh concrete or mortar) having little or no permeability to water vapor with (b) at least one coagulant for the film-forming synthetic polymer when in the presence of calcium ions. The coagulant is introduced in the form of an aqueous or aqueous alcoholic solution and/or by means of an aqueous wax emulsion and/or by means of an aqueous dispersion B of a synthetic polymer which is slightly permeable or impermeable to water. The aqueous dispersion B is prepared by polymerization in the presence of the coagulant. When applied by spraying to the surface of fresh mortar, the products form a continuous waterproof film, which is readily removed by peeling.