Richard Bernard Dougherty

US Patent:

20180362860, Dec 20, 2018

Filed:

Dec 19, 2016

Appl. No.:

16/061093

Inventors:

- Annandale NJ, US
Paul Podsiadlo - Humble TX, US
Chuansheng Bai - Phillipsburg NJ, US
Richard C. Dougherty - Moorestown NJ, US
Wenyih F. Lai - Bridgewater NJ, US
William W. Lonergan - Humble TX, US

International Classification:

C10G 45/12
C10G 45/64
C10G 45/62
C10G 45/10
C10G 45/08
C10G 65/04
B01J 29/40

Abstract:

Methods and catalysts are provided for performing dewaxing of diesel boiling range fractions, such as trim dewaxing, that allow for production of diesel boiling range fuels with improved cold flow properties at desirable yields. In some aspects, the methods can include use of dewaxing catalysts based on an MEL framework structure (ZSM-11) to provide improved dewaxing activity. This can provide sufficient dewaxing activity to achieve a desired level of improvement in cold flow properties at the lower hydrotreating temperatures that are generally desired near the start of operation of a hydrotreating reactor. In other aspects, the methods can include use of MEL dewaxing catalysts with reduced ratios of molecular sieve to binder so that trim dewaxing can be provided while maintaining a desirable yield under end-of-run hydrotreating conditions.

US Patent:

20160145512, May 26, 2016

Filed:

Nov 13, 2015

Appl. No.:

14/940603

Inventors:

Kristen S. Lyon - Humble TX, US
Eric D. Joseck - Burke VA, US
Gary P. Schleicher - Milford NJ, US
Richard C. Dougherty - Moorestown NJ, US
Angela Horton - Mantua NJ, US

Assignee:

EXXONMOBIL RESEARCH AND ENGINEERING COMPANY - Annandale NJ

International Classification:

C10G 69/02
C10M 101/00
C10M 101/02

Abstract:

Methods are provided for producing Group II and Group III base stocks with a controlled or consistent aromatics content. An aromatics-rich base stock, such as a Group I base stock or an alkylated aromatic base stock, can be added to the catalytically treated base stock in a minimal amount after the final catalytic treatment step but prior to fractionation. At the beginning of a processing run for forming lubricant base stock products, about 0.25 wt % to about 1.25 wt % of the Group I base stock can be added to a catalytically processed feed after the final catalytic processing stage but prior to fractionation to form the Group II and/or Group III base stock. During the course of the processing run, the amount of Group I base stock added can be reduced roughly in correspondence with the increase in aromatics caused by catalyst deactivation. This can allow a catalytically processed lubricant base stock product to be generated that contains at least about a threshold (minimum) aromatics content during the course of a processing run. Alternatively, this can allow a catalytically processed lubricant base stock product to be generated that has consistent aromatics content during the course of the processing run.