1
Vikram Singh, Edward J Grave, Paul Scott Northrop, Narasimhan Sundaram: Integrated controlled freeze zone (CFZ) tower and dividing wall (DWC) for enhanced hydrocarbon recovery. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Law Dept, November 20, 2012: US08312738 (10 worldwide citation)

The present invention relates to methods and apparatuses for the operation of a distillation tower containing a controlled freezing zone and at least one distillation section. The process and tower design are utilized for the additional recovery of hydrocarbons from an acid gas. In this process, a s ...


2
Narasimhan Sundaram, Bal K Kaul, Edward W Corcoran, Craig Y Sabottke, Richard L Eckes: Integration of rapid cycle pressure swing adsorption with refinery process units (hydroprocessing, hydrocracking, etc.). ExxonMobil Research and Engineering Company, Paul E Purwin, September 22, 2009: US07591879 (8 worldwide citation)

The present invention is a method for operating a rapid cycling pressure swing adsorption (RCPSA) having a cycle time, T, to separate a feed gas into a non-adsorbed gas and tail gas. The method includes the steps of passing the feed gas having a purity of F % at high pressure into a first end of a b ...


3
Larson Jay Michael, Narasimhan Sundaram Lakshmi, Gilmer John Neil, Bonesteel David Louis: Powdered metal valve seat insert.. Eaton, May 11, 1988: EP0266935-A1 (8 worldwide citation)

Wear resistant articles, especially valve seat inserts for internal combustion engines, are produced as sintered metal compacts comprising interspersed microzones of prealloyed austenitic stainless steel and softer ferrous metal, the microzones of austenitic stainless steel containing carbides and c ...


4
Narasimhan Sundaram, P Scott Northrop: Kinetic fractionators, and cycling processes for fractionation of gas mixtures. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Company Law Department, December 30, 2014: US08921637 (7 worldwide citation)

A process for separating methane from a natural gas mixture employs pressure swing adsorption in one or more vessels. Each vessel has an adsorbent material having a kinetic selectivity for contaminants over methane greater than 5. Contaminants within the natural gas mixture become gases kinetically ...


5
Amar S Wanni, Chithranjan Nadarajah, Jeffrey W Frederick, Narasimhan Sundaram: Apparatus and systems having an adsorbent contactor and swing adsorption processes related thereto. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Company Law Department, May 19, 2015: US09034078 (7 worldwide citation)

A method and apparatus are described for swing adsorption processes. The method includes obtaining different plates, wherein the plates have gaseous openings and a utility fluid opening. Then, the gaseous openings are substantially oriented along a common axis for gaseous openings and the plates are ...


6
Narasimhan Sundaram: Increasing scales, capacities, and/or efficiencies in swing adsorption processes with hydrocarbon gas feeds. ExxonMobil Research and Engineering Company, David M Weisberg, August 19, 2014: US08808426 (7 worldwide citation)

The invention relates to an increased efficiency high-capacity pressure and/or temperature swing adsorption process comprising: contacting a feedstream at a rate of more than 75 MSCFD with an adsorbent material under conditions sufficient for the adsorbent material to selectively adsorb at least one ...


7
Narasimhan Sundaram: Apparatus and systems having compact configuration multiple swing adsorption beds and methods related thereto. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Company Law Department, October 20, 2015: US09162175 (6 worldwide citation)

A compact configuration for a plurality of swing adsorption beds. The beds are configured within a single vessel such that one or more beds of adsorbent material are position as successive rings about a first, or core, bed of adsorbent material.


8
Narasimhan Sundaram, Richard A Huntington: Apparatus and systems having a rotary valve assembly and swing adsorption processes related thereto. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Company Law Department, September 1, 2015: US09120049 (6 worldwide citation)

Provided are apparatus and systems having a rotary valve assembly and swing adsorption separation techniques related thereto. The methods utilize a rotary valve assembly to perform swing adsorption processes. The rotary valve assembly includes a feed stator having at least two annular tracks. Each o ...


9
P Scott Northrop, Francis S Wu, Margaret Wu legal representative, Narasimhan Sundaram: Method of purifying hydrocarbons and regeneration of adsorbents used therein. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Company Law Department, September 11, 2012: US08262773 (6 worldwide citation)

An improved method is provided for removing contaminants from a hydrocarbon stream, such as a stream of raw natural gas. The contaminated hydrocarbon stream is passed through a first adsorbent bed containing molecular sieves to adsorb contaminants on the molecular sieves, thereby removing at least s ...


10
Narasimhan Sundaram, P Scott Northrop: Kinetic fractionators, and cycling processes for fractionation of gas mixtures. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Company Law Department, May 12, 2015: US09028595 (6 worldwide citation)

A process for separating methane from a natural gas mixture employs pressure swing adsorption in one or more vessels. Each vessel has an adsorbent material having a kinetic selectivity for contaminants over methane greater than 5. Contaminants within the natural gas mixture become gases kinetically ...



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