Manuel A Castelan

age ~51

from Houston, TX

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Pretreatment Of A Phosphorus-Modified Zeolite Catalyst For An Aromatic Alkylation Process
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US Patent:

8436222, May 7, 2013
Filed:

Jul 11, 2011
Appl. No.:

13/179987
Inventors:

Ashim Kumar Ghosh - Houston TX, US
Mohammad Shafiei - Sugar Land TX, US
Manuel Castelan - Houston TX, US
Pamela Harvey - Missouri City TX, US
Neeta Kulkarni - Houston TX, US
Assignee:

Saudi Basic Industries Corporation - Riyadh
International Classification:

C07C 2/66
US Classification:

585467, 585906
Abstract:

This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i. e. , decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.

Pretreatment Of A Phosphorus-Modified Zeolite Catalyst For A Toluene Methylation Process
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US Patent:

20090253949, Oct 8, 2009
Filed:

Apr 2, 2008
Appl. No.:

12/080354
Inventors:

Ashim Kumar Ghosh - Houston TX, US
Mohammad Shafiei - Sugar Land TX, US
Manuel Castelan - Houston TX, US
Pamela Harvey - Missouri City TX, US
Neeta Kulkarni - Houston TX, US
International Classification:

C07C 2/86
B01J 38/12
B01J 29/06
US Classification:

585454, 585446, 502 60, 502 38
Abstract:

This invention relates to a process for pretreating a zeolite catalyst, specifically a zeolite which has been modified with phosphorus. The catalyst may be used in a process for alkylation of aromatics, specifically toluene methylation. The pretreatment is first to contact the catalyst with the process reactants used in a process for alkylation of aromatics for at least two hours at conditions to produce an alkylated aromatic product and then with a gaseous stream containing oxygen at a temperature and for a time until there is no oxygen consumption. The zeolite may be a MFI zeolite. This pretreatment procedure for a phosphorus-modified zeolite catalyst produces a catalyst which has increased run time, i.e., decreased deactivation rate, compared to a fresh catalyst, even after successive regenerations.

In-Situ High Pressure Ph Measurement And Biofilm Sampling Device
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US Patent:

20180275111, Sep 27, 2018
Filed:

Mar 8, 2018
Appl. No.:

15/915202
Inventors:

Joseph W. Stolle - Wharton TX, US
Yao Xiong - Houston TX, US
Dennis R. Enning - Spring TX, US
David S. Fischer - Houston TX, US
Manuel A. Castelan - Pearland TX, US
International Classification:

G01N 33/18
Abstract:

A method for testing properties of a pressurized multiphase fluid sample containing at least hydrocarbons and water. The pressurized multiphase fluid sample is placed into a first pressurized chamber of a testing device. The water is separated from the hydrocarbons. At least part of the separated water is flowed through a first outlet in the first pressurized chamber and into a second pressurized chamber. The second pressurized chamber is optionally isolated from the first pressurized chamber. A pH level of the separated water is tested in the second pressurized chamber. Microbial activity and growth is tested for in the pressurized multiphase fluid in the first pressurized chamber. A pressure of the pressurized multiphase fluid is substantially maintained throughout the placing, separating, flowing, isolating, and testing steps.

Method For Conversion Of Aromatic Hydrocarbons
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US Patent:

20140350315, Nov 27, 2014
Filed:

May 23, 2013
Appl. No.:

13/900633
Inventors:

Ashim Kumar Ghosh - Houston TX, US
Pamela Harvey - Missouri TX, US
Neeta Kulkarni - Houston TX, US
Manuel Castelan - Pear Land TX, US
International Classification:

C07C 4/18
US Classification:

585321, 585486
Abstract:

A method of converting hydrocarbons requires contacting a hydrocarbon stream containing alkylated aromatic hydrocarbons with a catalyst of a phosphorus-containing pentasil zeolite in a reactor. The phosphorus-containing pentasil zeolite having a phosphorus content of 7.5% or less by weight of zeolite, a pore volume of at least 0.2 ml/g, and a Al MAS NMR spectrum characterized by a peak at or near 50 ppm that is greater than any other peak in said spectrum. A benzene-enriched output stream is recovered from the reactor.