Patents by Inventor Gerald V. Nelson
Gerald V. Nelson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5545602Abstract: Heavy hydrocarbons are hydrotreated to increase content of components boiling below 1000.degree. F. by contact with Group VIII non-noble metal oxide and Group VI-B metal oxide on alumina having a Total Surface Area of 150-240 m.sup.2 /g, a Total Pore Volume, (TPV) of 0.7-0.98, and a Pore Diameter Distribution whereby .ltoreq.20% of the TPV is present as primary micropores of diameter .ltoreq.100 .ANG., at least about 34% of TPV is present as secondary micropores of diameter of about 100 .ANG.-200 .ANG., and about 26%-46% of the TPV is present as mesopores of diameter .gtoreq.200 .ANG..Type: GrantFiled: April 20, 1995Date of Patent: August 13, 1996Assignee: Texaco Inc.Inventors: Gerald V. Nelson, Govanon Nongbri, Roy E. Pratt, David E. Sherwood, Jr., Pei-Shing E. Dai
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Patent number: 5494570Abstract: An improvement has been discovered in an ebullated bed process. A residual hydrocarbon oil feedstock is hydrocracked to yield a product oil. The amount of sediment in the product oil is controlled by adjusting hydrogen partial pressure according to an algorithm. A change in temperature and residence time is avoided.Type: GrantFiled: June 24, 1994Date of Patent: February 27, 1996Assignee: Texaco Inc.Inventors: Govanon Nongbri, Gerald V. Nelson, David E. Self, Glenn A. Clausen
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Patent number: 5468371Abstract: Heavy hydrocarbons are hydrotreated to increase content of components boiling below 1000.degree. F. by contact with Group VIII non-noble metal oxide and Group VIB metal oxide on alumina having a Total Surface Area of 175-220 m.sup.2 /g, a Total Pore Volume (TPV) of 0.6-0.8, and a Pore Diameter Distribution whereby .ltoreq.33% of the TPV is present as primary micropores of diameter .ltoreq.100 .ANG., at least about 41% of TPV is present as secondary micropores of diameter of about 100 .ANG.-200 .ANG., and about 16%-26% of the TPV is present as mesopores of diameter .gtoreq.200 .ANG.. Phosphorus containing compounds are avoided during catalyst preparation.Type: GrantFiled: April 11, 1994Date of Patent: November 21, 1995Assignee: Texaco Inc.Inventors: Gerald V. Nelson, Govanon Nongbri, Roy E. Pratt
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Patent number: 5435908Abstract: Heavy hydrocarbons are hydrotreated to increase content of components boiling below 1000.degree. F. by contact with Group VIII non-noble metal oxide and Group VI-B metal oxide on alumina having a Total Surface Area of 150-240 m.sup.2 /g, a Total Pore Volume, (TPV) of 0.7-0.98, and a Pore Diameter Distribution whereby .ltoreq.20% of the TPV is present as primary micropores of diameter .ltoreq.100 .ANG., at least about 34% of TPV is present as secondary micropores of diameter of about 100 .ANG.-200 .ANG., and about 26%-46% of the TPV is present as mesopores of diameter >200 .ANG..Type: GrantFiled: May 16, 1994Date of Patent: July 25, 1995Assignee: Texaco Inc.Inventors: Gerald V. Nelson, Govanon Nongbri, Roy E. Pratt, David E. Sherwood, Jr., Pei-Shing E. Dai
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Patent number: 5416054Abstract: Heavy oils may be hydrotreated in the presence of a porous alumina support bearing metals of Group VIII and VI-B and optionally phosphorus, the catalyst having a Total Surface Area of 165-230 m.sup.2 /g, a Total Pore Volume of 0.5-0.8 cc.g, and a Pore Diameter Distribution whereby less than about 5% the Total Pore Volume is present as primary micropores of diameter less than 80 .ANG., and secondary micropores of diameter of +20 .ANG. of a Pore Mode of 100-135 .ANG. are present in amount of at least about 65% of the micropore volume having pores with diameter less than 250 .ANG., and 22-29% of the Total Pore Volume is present as macropores of diameter >250 .ANG..The process of the instant invention is particularly effective in achieving desired levels of hydrodemetallation, hydrodesulfurization, and hydrocracking of asphaltenes in the fraction of hydrotreated/hydrocracked petroleum resid product having a boiling point greater than 1000.degree. F.Type: GrantFiled: February 25, 1993Date of Patent: May 16, 1995Assignee: Texaco Inc.Inventors: Pei-Shing E. Dai, Gerald V. Nelson, Govanon Nongbri, Roy E. Pratt, David E. Sherwood, Jr.
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Patent number: 5399259Abstract: Heavy oils may be hydrotreated in the presence of a porous alumina support bearing metals of Group VIII and VI-B and optionally phosphorus, the catalyst having a Total Surface Area of 165-230 m.sup.2 /g, a Total Pore Volume of 0.5-0.8 cc.g, and a Pore Diameter Distribution whereby less than about 5% of the Total Pore Volume is present as primary micropores of diameter less than 80.ANG., and secondary micropores of diameter of .+-.20.ANG. of a Pore Mode of 100-135.ANG. are present in amount of at least about 65% of the micropore volume having pores with diameter less than 250.ANG., and 22-29% of the Total Pore Volume is present as macropores of diameter >250.ANG.. The process of the instant invention is particularly effective in achieving desired levels of hydrodemetallation, hydrodesulfurization, and hydrocracking of asphaltenes in the fraction of hydrotreated/hydrocracked petroleum resid product having a boiling point greater than 1000.degree. F.Type: GrantFiled: April 20, 1992Date of Patent: March 21, 1995Assignee: Texaco Inc.Inventors: Pei-Shing E. Dai, Gerald V. Nelson, Govanon Nongbri, Roy E. Pratt, David E. Sherwood, Jr.
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Patent number: 5215653Abstract: An improved method of controlling catalyst inventory in the reactor of an ebullated bed process has been discovered. Pressure differentials are measured to calculate a catalyst inventory characterization factor. This factor is calculated by means of a new algorithm. Aged catalyst is withdrawn and fresh catalyst added in an amount to reestablish the value of the factor. The catalyst to oil ratio is maintained despite changes in bed ebullation, gas and liquid holdups, oil residence time and conversion.Type: GrantFiled: March 25, 1992Date of Patent: June 1, 1993Assignee: Texaco Inc.Inventors: Gerald V. Nelson, Govanon Nongbri
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Patent number: 5156733Abstract: In an ebullated bed process, it has been found that in switching from one sediment yielding feedstock to a second sediment yielding feedstock that the transient sediment concentration has caused unit shutdowns with lost production. A method has been found which avoids these high transient sediment concentrations. Fresh addition is substituted for regenerated catalyst addition until the average carbon on catalyst in the bed drops to 22 wt% basis carbon free catalyst. Second feedstock is added incrementally and sediment in the product analyzed. After full second feedstock rate is achieved, first feedstock is reduced incrementally with sediment analysis. Higher unit utilization is achieved with the corresponding increased yearly production.Type: GrantFiled: August 23, 1991Date of Patent: October 20, 1992Assignee: Texaco Inc.Inventors: Govanon Nongbri, Gerald V. Nelson, Stanley M. Farabee
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Patent number: 5108580Abstract: In a two stage catalytic cracking process a heavy cycle gas oil fraction (HCGO) nominal boiling range 600.degree. F. to 1050.degree. F., API gravity of -10.degree. to +10.degree. and 65 to 95 vol % aromatics is recycled to extinction between an ebullated bed hydrocracking zone and fluidized catalytic cracking zone to yield a liquid fuel and lighter boiling range fraction as the light fraction from each zone.The catalyst in the fluidized catalytic cracking zone is maintained at a micro activity 68 to 72 while cracking a virgin gas oil to HCGO. HCGO is then mixed with vacuum residuum and hydrocracked in an ebullated bed reactor. The mid range fraction is recycled to the fluidized catalytic cracking zone. The 1000.degree. F..sup.+ fraction is blended with a fuel oil.Type: GrantFiled: March 8, 1989Date of Patent: April 28, 1992Assignee: Texaco Inc.Inventors: Govanon Nongbri, Gerald V. Nelson, Roy E. Pratt, Charles H. Schrader, William B. Livingston, Michael P. Bellinger, Scott M. Sayles
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Patent number: 4394254Abstract: A method for separating straight chain hydrocarbons from a hydrocarbon fraction having straight chain hydrocarbons, nonstraight chain hydrocarbons, and a sulfur compound, includes the steps of contacting the hydrocarbon fraction with a 5A zeolite having crystals of an average size larger than about 700 angstroms which selectively absorbs the straight chain hydrocarbons to the substantial exclusion of the nonstraight chain hydrocarbons and sulfur compound. Large zeolite crystals are found to have a much longer useful life in this separation method than zeolite crystals having an average size of less than about 700 angstroms as measured along one edge of the zeolite crystal. The hydrocarbon fraction has more than about 800 wppm total sulfur including more than about 15 wppm mercaptan.Type: GrantFiled: April 26, 1982Date of Patent: July 19, 1983Assignee: Texaco Inc.Inventors: Paul H. Lewis, Gerald V. Nelson
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Patent number: 4354242Abstract: A control system controls the temperature of gas oil being charged to a reactor in a hydrotreating unit. The control system includes a heater which heats the gas oil in accordance with a control signal corresponding to a desired temperature. A gravity analyzer senses the API gravity of the gas oil and provides a corresponding signal. A sulfur analyzer senses the sulfur content of the gas oil and provides a representative signal. A boiling point analyzer senses the 50% boiling point temperature, the initial boiling point temperature and the end point temperature of the gas oil and provides corresponding signals. A flow rate sensor provides a signal corresponding to the flow rate of the gas oil entering the heater. A control signal circuit provides the control signal to the heater in accordance with the signals from the gravity analyzer, the sulfur analyzer, the boiling point analyzer and the flow rate sensor.Type: GrantFiled: December 15, 1980Date of Patent: October 12, 1982Assignee: Texaco Inc.Inventors: Charles A. Ganster, Gerald V. Nelson
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Patent number: 4349884Abstract: A control system controls the temperature of naphtha being charged to a reactor in a hydrotreating unit. The control system includes a heater which heats the naphtha in accordance with a control signal corresponding to a desired temperature. A gravity analyzer senses the API gravity of the naphtha and provides a corresponding signal. A sulfur analyzer senses the sulfur content of the naphtha and provides a representative signal. A boiling point analyzer senses the 50% boiling point temperature, the initial boiling point temperature and the end point temperature of the naphtha and provides corresponding signals. A flow rate sensor provides a signal corresponding to the flow rate of the naphtha entering the heater. A control signal circuit provides the control signal to the heater in accordance with the signals from the gravity analyzer, the sulfur analyzer, the boiling point analyzer and the flow rate sensor.Type: GrantFiled: December 15, 1980Date of Patent: September 14, 1982Assignee: Texaco Inc.Inventors: Charles A. Ganster, Gerald V. Nelson
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Patent number: 4347577Abstract: A control system controls the temperature of kerosine/diesel fuel being charged to a reactor in a hydro-treating unit. The control system includes a heater which heats the kerosine/diesel fuel in accordance with a control signal corresponding to a desired temperature. A gravity analyzer senses the API gravity of the kerosine/diesel fuel and provides a corresponding signal. A sulfur analyzer senses the sulfur content of the kerosine/diesel and provides a representative signal. A boiling point analyzer senses the 50% boiling point temperature, the initial boiling point temperature and the end point temperature of the kerosine/diesel fuel and provides corresponding signals. A flow rate sensor provides a signal corresponding to the flow rate of the kerosine/diesel fuel entering the heater. A control signal circuit provides the control signal to the heater in accordance with the signals from the gravity analyzer, the sulfur analyzer, the boiling point analyzer and the flow rate sensor.Type: GrantFiled: December 15, 1980Date of Patent: August 31, 1982Assignee: Texaco Inc.Inventors: Charles A. Ganster, Gerald V. Nelson
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Patent number: 4244810Abstract: A fluidized catalytic cracking process for conversion of hydrocarbon charge to cracked products wherein a regenerated fluidized catalytic cracking catalyst having deposited thereon about 1000 to 10,000 ppm of nickel, vanadium, iron or mixtures thereof is treated with a sodium compound prior to use for cracking hydrocarbon charge such that hydrogen yield is increased.Type: GrantFiled: December 10, 1979Date of Patent: January 13, 1981Assignee: Texaco Inc.Inventors: Douglas J. Youngblood, Gerald V. Nelson
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Patent number: 4172818Abstract: The hydrogen consumption in the catalytic desulfurization of hydrocarbon oils is reduced by the incorporation in the catalyst of a small amount of arsenic.Type: GrantFiled: August 25, 1978Date of Patent: October 30, 1979Assignee: Texaco Inc.Inventors: Gerald V. Nelson, Charles H. Schrader, Lee K. Gilmer
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Patent number: 4098721Abstract: A desulfurization catalyst is activated by being heated to a temperature between about 750.degree. and 850.degree. F. in the presence of the charge stock to be desulfurized during the initial stages of the on-stream period. In a preferred embodiment the catalyst, prior to the heat treatment, is sulfided at a low temperature and low pressure. The resulting catalyst effectively desulfurizes a petroleum hydrocarbon charge stock with reduced hydrogen consumption.Type: GrantFiled: November 3, 1975Date of Patent: July 4, 1978Assignee: Texaco Inc.Inventors: Charles A. Ganster, Mary E. Callaghan, Lee K. Gilmer, Gerald V. Nelson, Kenneth D. Miller
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Patent number: 3953321Abstract: A desulfurization catalyst is activated by being heated to a temperature between about 750.degree. and 850.degree.F. in the presence of the charge stock to be desulfurized during the initial stages of the on-stream period. In a preferred embodiment the catalyst, prior to the heat treatment, is sulfided at a low temperature and low pressure. The resulting catalyst effectively desulfurizes a petroleum hydrocarbon charge stock with reduced hydrogen consumption.Type: GrantFiled: December 27, 1974Date of Patent: April 27, 1976Assignee: Texaco Inc.Inventors: Charles A. Ganster, Mary E. Callaghan, Lee K. Gilmer, Gerald V. Nelson, Kenneth D. Miller