| Patent Number |
Title Of Patent |
Date Issued |
| 5510557 |
Endothermic catalytic dehydrogenation process |
April 23, 1996 |
| Catalytic dehydrogenation wherein feed is passed in one direction through the bed in a first cycle and heating gas is passed in an opposite direction in a second cycle to provide the endothermic heat of reaction and regenerate catalyst. The operation is controlled to balance properly |
| 5502971 |
Low pressure recovery of olefins from refinery offgases |
April 2, 1996 |
| A low pressure cryogenic process is disclosed for recovering C.sub.2 and heavier hydrocarbons and particularly olefins from a refinery offgas containing hydrogen, methane, nitrogen oxide in addition to the C.sub.2 and heavier hydrocarbons. The conventional high pressures are eliminated |
| 5425415 |
Vertical heat exchanger |
June 20, 1995 |
| A vertical heat exchanger including a vertical tube bundle connected between a lower inlet manifold and upper outlet manifold. The tube bundle comprises numerous pairs of concentric tubes with the inner tube being spaced from the outer tube to form an annular flow passage positioned |
| 5389234 |
Waste sludge disposal process |
February 14, 1995 |
| Waste refinery sludge having a high water content along with hydrocarbon liquids and solids is disposed of in a delayed coking process. The sludge is pretreated and heated to a coking temperature and then introduced into the top of a delayed coking drum. |
| 5386871 |
Thermal energy storage and recovery system |
February 7, 1995 |
| A heat storage apparatus is disclosed providing a vertical tube bundle arrangement in a vessel containing a heat storage medium. The tube bundle is divided into modular sector-shaped units each having a radial distribution manifold at the bottom and top with each radial distribution |
| 5334771 |
Peroxidation of secondary carbon in alkanes and cycloalkanes |
August 2, 1994 |
| A secondary carbon atom in an alkane, including alkyl groups attached to aromatic rings, or cycloalkane is peroxidized by molecular oxygen to the corresponding hydroperoxide in the absence of a catalyst. The peroxidation is carried out in the presence of a tertiary hydroperoxide initiato |
| 5319106 |
Stabilization of mixtures of maleic anhydride and acrylic acid during distillation |
June 7, 1994 |
| In the production of maleic anhydride, a crude maleic anhydride is produced which contains acrylic acid and other by-products. The crude maleic anhydride is dissolved in a solvent and the acrylic acid is distilled off. To avoid the polymerization of the acrylic acid, an inhibitor of |
| 5315056 |
Catalyst regeneration in a dehydrogenation process |
May 24, 1994 |
| In a dehydrogenation process wherein catalyst is regenerated off-stream by use of heated air, at least two reactors are in the regeneration cycle, with regeneration air being heated to regeneration catalyst temperature for introduction into the first reactor, and thereafter being reheate |
| 5314610 |
Staged catalytic cracking process |
May 24, 1994 |
| A staged catalytic cracking process and apparatus is disclosed where each stage has a catalyst to oil ratio of at least 15 and there are individual hydrocarbon feeds to each stage and product removal from each stage. There is a residence time profile with the first stage having a short r |
| 5253703 |
Waste heat exchanger |
October 19, 1993 |
| A heat exchanger adapted to handle dusty hot waste gases including a vertically oriented shell through which the waste gases flow longitudinally downward. The shell contains a tube assembly of vertical tubes having external, longitudinal heat transfer fins with the tubes being connec |
| 5252197 |
Process for upgrading gasolines and other hydrocarbon mixtures |
October 12, 1993 |
| A process for upgrading gasolines and other hydrocarbon mixtures. The hydrocarbon mixture is contacted with a large pore zeolite catalyst in order to crack n-paraffins to form olefins and lower molecular weight n-paraffins, to cause the olefins to react with benzene in order to form |
| 5252183 |
Process of pulping and bleaching fibrous plant material with tert-butyl alcohol and tert-butyl p |
October 12, 1993 |
| A process for producing bleached pulp from a fibrous plant material (e.g., wood), wherein the material is contacted with an alcohol solvent in a pulping zone to extract lignin from the fibrous plant material. The resulting pulp is then treated with a hydroperoxide or peroxide bleaching |
| 5245093 |
Reaction processes in a multi-stage fluidized bed |
September 14, 1993 |
| A process for reacting a fluid phase (gaseous and/or liquid phase) in contact with a solid phase in a reaction zone, wherein the improvement in said process comprises reacting the fluid phase in contact with the solid phase in a horizontally-oriented fluidized bed vessel. The vessel incl |
| 5227555 |
Production of gasoline from light hydrocarbons |
July 13, 1993 |
| A process for the production of gasoline from a light hydrocarbon feed. The feed is catalytically aromatized to produce an effluent containing aromatics and olefins with the aromatics and olefins being subjected to alkylation to produce a gasoline product with a higher octane rating. |
| 5220075 |
Initiated peroxidation of secondary carbon in alkanes and cycloalkanes |
June 15, 1993 |
| A secondary carbon atom in an alkane, including alkyl groups attached to aromatic rings, or cycloalkane is oxidized by molecular oxygen to the corresponding hydroperoxide in the absence of a catalyst. The oxidation is carried out in the presence of a tertiary hydroperoxide initiator whic |
| 5217935 |
Processes for regenerating catalysts contaminated with carbonaceous materials |
June 8, 1993 |
| Processes for the regeneration of catalysts, such as hydrogenation catalysts, and the defouling of objects, which are contaminated with carbonaceous deposits. The catalyst or object is contacted with water, oxygen-containing gas, and at least one alkaline material maintained at a pH |
| 5215725 |
Aromatic alkylation process |
June 1, 1993 |
| A system for the catalytic distillation production of alkylated aromatic compounds is provided wherein the vapor pressure of the olefin may be increased while maintaining the same olefin feed rate and aromatic to olefin ratio. In one embodiment a side stream from the vapor from the s |
| 5200093 |
Supercritical water oxidation with overhead effluent quenching |
April 6, 1993 |
| In a supercritical oxidation process, the oxidized supercritical fluid effluent (46) discharged from the upper region of the reactor vessel (10) is contacted with a cold quench liquid (66) so as to produce a relatively solids free vapor stream (53) and a liquid stream (51) containing the |
| 5198591 |
Method to manufacture bisphenol A |
March 30, 1993 |
| The invention relates to a process for obtaining a high purity bisphenol from a post-reaction mixture resulting from the step of synthesis of phenol and acetone in the presence of a strong acid cation exhanger catalyst, by the way of crystallation and separation by distillation follo |
| 5183556 |
Production of diesel fuel by hydrogenation of a diesel feed |
February 2, 1993 |
| A process for producing diesel fuel from a diesel hydrocarbon feed. Hydrogen is fed cocurrently with the feed to a first hydrogenation zone in the presence of a hydrogenation catalyst. Liquid effluent from the first hydrogenation zone is then passed to a second hydrogenation zone, wherei |
| 5122260 |
Liquefaction of solid carbonaceous material with catalyst recycle |
June 16, 1992 |
| In the two stage liquefaction of a carbonaceous solid such as coal wherein coal is liquefied in a first stage in the presence of a liquefaction solvent and the first stage effluent is hydrogenated in the presence of a supported hydrogenation catalyst in a second stage, catalyst which has |
| 5118897 |
Reactivation of alkylation catalysts |
June 2, 1992 |
| A process for reactivating alkylation catalyst which comprises contacting alkylation catalyst with hydrogen and benzene in the essential absence of olefin. The reactivation process may be conducted under conditions (eg., temperature, pressure) similar to that employed in an alkylation re |
| 5100560 |
Apparatus and method for supercritical water oxidation |
March 31, 1992 |
| A pressurized feed material (30) in aqueous suspension is oxidized in a supercritical temperature reaction zone (20) in an upper region of a vertically elongated, cyclindrical walled, closed pressure vessel (10) to form an oxidized super fluid phase (46) which is removed from the upper |
| 5086193 |
Aromatic alkylation process |
February 4, 1992 |
| A process for the catalytic distillation production of alkylated aromatic compounds is provided wherein the vapor pressure of the olefin may be increased while maintaining the same olefin feed rate and aromatic to olefin ratio. In one embodiment a side stream from the vapor from the |
| 5021147 |
Solid addition and withdrawal |
June 4, 1991 |
| A system for adding and withdrawing solids to a high pressure reactor wherein there is provided improved control of flow and concentrations of a slurry of solids in a transport oil for introducing and withdrawing solids from the reactor. In addition, there is provided for improved heatin |
