Leroy R Clavenna

US Patent:

6465529, Oct 15, 2002

Filed:

Aug 1, 2000

Appl. No.:

09/628407

Inventors:

Michel Andre Daage - Baton Rouge LA
Russell John Koveal - Baton Rouge LA
Leroy Russell Clavenna - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 2700

US Classification:

518709, 518700, 518715, 502 20, 502 22, 502 23, 502241, 502325, 502326, 208 15, 208 18, 208 61, 208133

Abstract:

An aqueous low temperature oxidation (ALTO) process wherein a catalyst or catalyst precursor constituted of a solids support, or powder component, and a metal, or metals component, inclusive of cobalt, is oxidized, reduced and rendered catalytically active for conducting carbon monoxide hydrogenation reactions. The cobalt catalyst or cobalt catalyst precursor is thus contacted at low temperature with an oxidant in the presence of water (e. g. , water to which an oxidant is added), sufficient to oxidize the cobalt metal, or metals component of the catalyst or catalyst precursor. On reduction, the hydrogenation activity of the cobalt catalyst is increased. All or a portion of the cobalt metal of the catalyst precursor is oxidized to form a Co cationic or oxo-anionic species at least during the initial phase of the reaction. On reduction, as may be produced by contact and treatment of the oxidized catalyst or catalyst precursor with hydrogen, or a hydrogen-containing gas, the catalytic metal, or metals component of the catalyst, is reduced to metallic metal, e. g. , Co, and the catalyst thereby activated, and/or the catalytic activity increased.

US Patent:

6521565, Feb 18, 2003

Filed:

Aug 1, 2000

Appl. No.:

09/630278

Inventors:

Leroy Russell Clavenna - Baton Rouge LA
Hyung Suk Woo - Baton Rouge LA
Charles Harrison Mauldin - Baton Rouge LA
William Augustine Wachter - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annadale NJ

International Classification:

B01J 2300

US Classification:

502325, 502324, 502326, 502331

Abstract:

A catalyst precursor comprising a composite of a solids support, or powder component, and a compound or salt of a metal, or metals component, inclusive of cobalt, is upon reduction rendered catalytically active for conducting hydrogenation reactions, especially carbon monoxide hydrogenation reactions by contact at low temperature with liquid water, or steam, or a mixture of liquid water and steam, sufficient to oxidize and convert the metal, or metals component of the catalyst precursor to a metal hydroxide, low oxygen-containing metal oxide, or mixture of metal hydroxide and low oxygen-containing metal oxide. On reduction, as may be produced by contact and treatment of the oxidized catalyst precursor with hydrogen, the now well dispersed oxide or hydroxylated catalytic metal, or metals component of the catalyst, is reduced to metallic metal, e. g. , Co, and the catalyst thereby activated.

US Patent:

6531517, Mar 11, 2003

Filed:

Aug 1, 2000

Appl. No.:

09/630279

Inventors:

William Augustine Wachter - Baton Rouge LA
Gregg Johnston Howsmon - Baton Rouge LA
Jeffrey Thomas Elks - Baton Rouge LA
Leroy Russell Clavenna - Baton Rouge LA
Hyung Suk Woo - Baton Rouge LA
Claude Clarence Culross - Baton Rouge LA
Charles Harrison Mauldin - Baton Rouge LA
Christine Esther Kliewer - Clinton NJ

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 2700

US Classification:

518709, 518715, 518700, 502 20, 502 22, 502 23, 502241, 502325, 502326, 208 15, 208 18, 208 61, 208 33

Abstract:

A process for increasing the hydrogenation activity, particularly the carbon monoxide hydrogenation activity, of a catalyst or catalyst precursor comprised of a particulate solids support component and a catalytic metal, or metals component, preferably cobalt; cobalt alone or cobalt and an additional metal, or metals added to promote or modify the reaction produced by the cobalt. Treatment of the catalyst, or catalyst precursor is conducted at low temperature ranging from ambient to about 275Â C. sufficient to form on the surface of a catalyst precursor, e. g. , a cobalt catalyst precursor, a cobalt metal hydroxide, low valence cobalt metal oxide, or mixture of cobalt metal hydroxide and low valence cobalt metal oxide. Sometimes also metallic metal, e. g. , cobalt, is also formed, and dispersed on the surface of the support.

US Patent:

6624204, Sep 23, 2003

Filed:

Sep 1, 2000

Appl. No.:

09/653914

Inventors:

Michel A. Daage - Baton Rouge LA
Russell John Koveal - Baton Rouge LA
David Chester Long - Baton Rouge LA
Leroy Russell Clavenna - Baton Rouge LA
James Dirickson Mumford - Long Valley NJ
Claude Clarence Culross - Baton Rouge LA

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C07C 2700

US Classification:

518709, 518700, 518715, 502 20, 502301, 502326, 502331

Abstract:

A method is disclosed for renewing the activity of a Dispersed Active Metal (DAM) catalyst during operation of a reactor wherein the hydrogenation of carbon monoxide to produce a mixture of hydrocarbons is being carried out comprising withdrawing a mixture of hydrocarbons and a portion of the DAM catalyst, reducing the hydrocarbon content thereof, heating the mixture above the melting temperature of at least one of the metals of the DAM to form a melt, removing any slag that forms on the melt, cooling the melt to form a solid, reducing the particle size thereof to form a renewed particulate DAM catalyst, which is then returned to the reactor. Wherein the DAM catalyst is a Raney catalyst, a leachable metal is added to the reduced hydrocarbon mixture or the melt under non-oxidizing conditions and, after the solid is reduced to a fine particle size, extracting the leachable metal with caustic. The activity of the DAM may be modified or enhanced during the process by the addition of promoter metals, or prior to being returned to the reactor, by slurry low temperature oxidation followed by reduction at elevated temperature, and may further be enhanced by being passivated prior to being returned to the reactor. The catalyst may be withdrawn and replaced periodically or continuously during the operation of the reactor.

US Patent:

7726871, Jun 1, 2010

Filed:

Dec 20, 2006

Appl. No.:

11/641752

Inventors:

Limin Song - West Windsor NJ, US
Leroy Clavenna - Baton Rouge LA, US
Ian A. Cody - Annandale NJ, US
Mohsen S. Yeganeh - Hillsborough NJ, US
Alan H. Wolf - Morristown NJ, US
Glen B. Brons - Phillipsburgh NJ, US
Wayne J. York - Baton Rouge LA, US

Assignee:

ExxonMobil Research & Engineering Company - Annandale NJ

International Classification:

B01F 11/00
B06B 1/18

US Classification:

366116, 208 48 R

Abstract:

Vibrational energy generated with a pneumatic vibrator is controlled to independently adjust the amplitude and the frequency. A mechanical resonator is used to adjust the frequency. The controlled vibrational energy can be applied to equipment, such as a heat exchanger to mitigate fouling.

US Patent:

7862224, Jan 4, 2011

Filed:

Apr 15, 2010

Appl. No.:

12/760576

Inventors:

Limin Song - West Windsor NJ, US
Leroy Clavenna - Baton Rouge LA, US
Mohsen S. Yeganeh - Hillsborough NJ, US
H. Alan Wolf - Morristown NJ, US
Glen B Brons - Phillipsburg NJ, US
Wayne J. York - Baton Rouge LA, US
Ian A. Cody - Adelaide, AU

Assignee:

ExxonMobil Research & Engineering Company - Annandale NJ

International Classification:

B01F 11/00
F28D 11/06
F28G 7/00

US Classification:

366116, 165 84

Abstract:

Vibrational energy generated with a pneumatic vibrator is controlled to independently adjust the amplitude and the frequency. A mechanical resonator is used to adjust the frequency. The controlled vibrational energy can be applied to equipment, such as a heat exchanger to mitigate fouling.

US Patent:

8211548, Jul 3, 2012

Filed:

Dec 20, 2006

Appl. No.:

11/641756

Inventors:

ChangMin Chun - BelleMead NJ, US
Mark A. Greaney - Upper Black Eddy PA, US
Thomas Bruno - Raritan NJ, US
Ian A. Cody - Annadale NJ, US
Trikur A. Ramanarayanan - Somerset NJ, US
LeRoy R. Clavenna - Baton Rouge LA, US

Assignee:

ExxonMobil Research & Engineering Co. - Annandale NJ

International Classification:

B32B 15/04

US Classification:

428469, 428623, 428629, 428698

Abstract:

A heat transfer component that is resistant to both corrosion and fouling is disclosed having a heat exchange surface formed from a silicon containing steel composition including an alloy and a non-metallic film formed on a surface of the alloy. The alloy is formed from the composition η, θ, and τ, in which η is a metal selected from the group consisting of Fe, Ni, Co, and mixtures thereof, θ is Si, and τ is at least one alloying element selected from the group consisting of Cr, Al, Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Sc, La, Y, Ce, Ru, Rh, Ir, Pd, Pt, Cu, Ag, Au, Ga, Ge, As, In, Sn, Sb, Pb, B, C, N, P, O, S and mixtures thereof. The non-metallic film comprises sulfide, oxide, carbide, nitride, oxysulfide, oxycarbide, oxynitride and mixtures thereof. The surface roughness of the heat transfer component is less than 40 micro inches.

US Patent:

8470097, Jun 25, 2013

Filed:

May 15, 2012

Appl. No.:

13/471906

Inventors:

ChangMin Chun - BelleMead NJ, US
Mark A Greaney - Upper Black Eddy PA, US
Thomas Bruno - Raritan NJ, US
Ian A Cody - Adelaide, AU
Trikur A Ramanarayanan - Somerset NJ, US
LeRoy A Clavenna - Baton Rouge LA, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

C23C 8/16
C23C 8/18

US Classification:

148240, 148276, 148277, 148283, 148284, 148285, 148286, 148287, 428469, 428623, 428629, 428698

Abstract:

A method of providing sulfidation corrosion resistance and corrosion induced fouling resistance to a heat transfer component surface includes providing a silicon containing steel composition including an alloy and a Si-partitioned non-metallic film formed on a surface of the alloy. The alloy is formed from the composition η, θ,and τ, in which η is a metal selected from the group consisting of Fe, Ni, Co, and mixtures thereof, θ is Si, and τ is at least one alloying element selected from the group consisting of Cr, Al, Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Sc, La, Y, Ce, Ru, Rh, Ir, Pd, Pt, Cu, Ag, Au, Ga, Ge, As, In, Sn, Sb, Pb, B, C, N, P, O, S and mixtures thereof. The Si-partitioned non-metallic film comprises at least one of sulfide, oxysulfide and mixtures thereof.