Kirit A Patel

US Patent:

6562103, May 13, 2003

Filed:

Aug 26, 2002

Appl. No.:

10/228128

Inventors:

Rustam H. Sethna - Palatine IL
Michael Whysall - Wilrijk, BE
Kirit M. Patel - Winfield IL

Assignee:

UOP LLC - Des Plaines

International Classification:

C21B 1302

US Classification:

75505, 75496

Abstract:

The present invention relates to a pressure swing adsorption process for direct reduction of iron wherein a portion of spent reducing gas withdrawn from the direct reduction reactor is subjected to a PSA process for the removal of carbon dioxide from the spent reducing gas. An improved CO -rejection method using an external natural gas purge stream after depressurization and before the product purge step is described. The PSA process comprises an external purge step with a non-absorbable gas, which surprisingly reduces the adsorbent regeneration requirements to maintain the selective adsorption of carbon dioxide from the spent reducing gas. The external natural gas purge results in a cleaner bed before the start of each adsorption cycle. Consequently, significantly more CO can be rejected and/or higher hydrogen and CO recoveries can be attained. The external purge stream is fully integrated into the DDRI production scheme.

US Patent:

7399341, Jul 15, 2008

Filed:

Apr 26, 2005

Appl. No.:

11/114285

Inventors:

Kirit M. Patel - Winfield IL, US
Henry Rastelli - Gurnee IL, US
Martha S. Buchan - Lincolnshire IL, US
Henry L. Griffith - Mobile AL, US
Michele S. Herron - Spanish Fort AL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 53/047

US Classification:

95 96, 95103, 95140, 423709

Abstract:

A process for the purification of hydrogen based gas mixtures utilizing zeolite X wherein the particle size distribution of the zeolite X powder has a coefficient of variation from about 15% to about 30%.

US Patent:

20110126709, Jun 2, 2011

Filed:

Dec 2, 2009

Appl. No.:

12/629307

Inventors:

Bradley P. Russell - Wheaton IL, US
Kirit M. Patel - Winfield IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 53/047

US Classification:

95143

Abstract:

The invention uses a calcium exchanged zeolite molecular sieve adsorbent in a pressure swing adsorption process to purify hydrogen from refinery off-gas streams. The use of this adsorbent provides for an improvement in removal of methane and allows for faster cycle times and the processing of a higher volume of hydrogen for a given size adsorption bed.

US Patent:

20130152795, Jun 20, 2013

Filed:

Dec 19, 2011

Appl. No.:

13/330448

Inventors:

Kirit M. Patel - Winfield IL, US
Bradley P. Russell - Wheaton IL, US
Paul Alvin Sechrist - South Barrington IL, US
Michael Jerome Vetter - Schaumburg IL, US
Hua Chen - Pleasant Prairie WI, US
Pengfei Chen - Des Plaines IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 53/02

US Classification:

96152

Abstract:

Adsorption vessels and systems utilizing adsorption vessels are provided herein. In one embodiment, an adsorption vessel for receiving a fluid mixture and for separating a component from therein includes a vessel wall extending from a bottom end to a top end and defining a vessel chamber. A bottom inlet is formed in the bottom end of the adsorption vessel for introducing the fluid mixture to the vessel chamber. Further, a support plate is positioned in the vessel chamber above the bottom end, and defines a bottom void volume between the support plate and the bottom end. A filler material having a total porosity of less than about 25% is positioned in the bottom void volume and defines a channel for flow of the fluid mixture from the bottom inlet to the support plate.

US Patent:

52598535, Nov 9, 1993

Filed:

Dec 10, 1992

Appl. No.:

7/988491

Inventors:

Robert S. Brasier - Mount Prospect IL
Steven P. Lankton - Wheeling IL
Richard T. Maurer - Nanuet NY
Kirit M. Patel - Hopewell Junction NY

Assignee:

UOP - Des Plaines IL

International Classification:

B01D 5304
B01D 5314

US Classification:

95 92

Abstract:

An integrated process for treating a vent gas stream containing halogenated organic compounds to produce a clean vent gas with vacuum swing adsorption of the halogenated organic compounds and the recycle of a gaseous stream from the halogenated organic compound recovery section. A liquid sponge oil containing halogenated organic compounds is contacted and admixed with the evacuated effluent from the adsorption zone to prevent the accumulation of normally gaseous hydrocarbonaceous compounds.

US Patent:

20180036671, Feb 8, 2018

Filed:

Oct 18, 2017

Appl. No.:

15/787661

Inventors:

- Des Plaines IL, US
Kirit M. Patel - Winfield IL, US
Henry Rastelli - Gurnee IL, US

International Classification:

B01D 53/047

Abstract:

Process and apparatuses for purifying a feed stream containing COand predominantly hydrogen are provided. In an embodiment, the process includes passing the feed stream through a multilayer adsorbent bed comprising a first adsorbent section, a second adsorbent section downstream from the first adsorbent section and a third adsorbent section downstream from the second adsorbent section. The first adsorbent section comprises an activated carbon layer, the second adsorbent section comprises a layer of molecular sieve of the faujasite structure type with a Si/Al atomic ratio of from 1.5 to 8.0 and the third adsorbent section comprises a layer of molecular sieve of the faujasite structure type with a Si/Al atomic ratio of from 1.0 to 1.5. At least one of N, CO, CHand CO is adsorbed from the feed stream and a purified hydrogen product is recovered from the multilayer adsorbent bed.

US Patent:

20150376525, Dec 31, 2015

Filed:

Jun 23, 2015

Appl. No.:

14/747603

Inventors:

- Des Plaines IL, US
Ronald J. Long - Arlington Heights IL, US
Xin X. Zhu - Long Grove IL, US
Kirit M. Patel - Winfield IL, US

International Classification:

C10L 3/10
C07C 7/13
B01D 53/047
C07C 4/04

Abstract:

The invention provides for sending a natural gas stream through a pressure swing adsorption unit to send a gas stream comprising mainly nitrogen, methane and hydrogen to a fuel gas stream and a gas stream comprising a significant majority of C+ hydrocarbons from the natural gas stream to a tail gas stream to then go to a stream cracker.

US Patent:

20140352531, Dec 4, 2014

Filed:

May 28, 2013

Appl. No.:

13/903850

Inventors:

- Des Plaines IL, US
Kirit M. Patel - Winfield IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01D 53/047

US Classification:

95 8, 95105, 96108, 96121, 96130, 95 96

Abstract:

Methods of preparing an impurity-depleted hydrogen stream, methods of analyzing content of an impurity-depleted hydrogen stream from a pressure swing adsorption process, and pressure swing adsorption apparatuses are provided herein. In an embodiment, a method of analyzing content of an impurity-depleted hydrogen stream from a pressure swing adsorption process includes providing a hydrogen-containing feed stream to a pressure swing adsorption zone. The hydrogen-containing feed stream further includes an impurity content including methane and carbon monoxide. Methane and carbon monoxide are adsorbed from the hydrogen-containing feed stream in the pressure swing adsorption zone. The impurity-depleted hydrogen stream is withdrawn from the pressure swing adsorption zone, with the impurity-depleted hydrogen stream having a residual methane content and a residual carbon monoxide content. The residual methane content of the impurity-depleted hydrogen stream is sensed.

Author:

Kirit T. Patel

ISBN #:

0861161203