Abstract: Systems and methods for the maintenance of active chromium-based catalysts and their use in polymerization processes are described. In one embodiment, a system for the introduction of multiple polymerization components to activate a chromium based catalyst within a mix tank is described. Other described features may include materials and methods to purify the liquid medium of a catalyst slurry so that the catalyst slurry maintains a high level of activity. The active chromium-based catalyst may provide polyolefins with a number of desirable properties in a reliable, consistent, and predictable manner.
Type:
Grant
Filed:
August 11, 2010
Date of Patent:
March 19, 2013
Assignee:
Chevron Philips Chemical Company LP
Inventors:
Elizabeth A. Benham, Max P. McDaniel, Kathy S. Collins
Abstract: A fractionation system for a polymerization reactor includes a membrane separation system designed to separate light components, such as unreacted monomer and inerts, from diluent. The membrane separation system may employ one or more membrane modules designed to separate hydrocarbons based on size, solubility, or combinations thereof. The fractionation system also may include a heavies fractionation column designed to separate heavy components, such as unreacted comonomer and oligomers, from the diluent.
Type:
Application
Filed:
July 1, 2010
Publication date:
January 5, 2012
Applicant:
Chevron Philips Chemical Company LP
Inventors:
Andrew J. Mills, Ralph W. Romig, Andrea L. Hoener
Abstract: The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits or other equipment of a polyolefin production system and upstream systems. The Raman probe or other spectroscopic probes may be used to obtain spectroscopic measurements of the contents of the conduits or other equipment. The spectroscopic measurements may be processed and analyzed to determine one or more properties of interest of the contents.
Abstract: A polymer composition comprising a density equal to or greater than about 0.947 g/cc, a high load melt index from about 1 g/10 min to about 30 g/10 min, and a tensile natural draw ratio less than about 14167 ?-12958, where ? is the density (g/cc) of the composition. A polymer composition comprising a tensile natural draw ratio less than about 14167?-12958, where ? is the density (g/cc) of the composition and wherein less than about 1 weight percent of the composition comprises non-polymeric additives.
Type:
Grant
Filed:
February 22, 2006
Date of Patent:
September 15, 2009
Assignee:
Chevron Philips Chemical Company LP
Inventors:
Rajendra K. Krishnaswamy, Qing Yang, David C. Rohlfing, Max P. McDaniel, Kumudini C. Jayaratne, Jim E. French
Abstract: The present technique provides for the use of spectroscopic probes, such as Raman probes, within the conduits of a polyolefin production system. The Raman probe or other spectroscopic probes may be used to obtain spectroscopic measurements of the contents of the conduits. The spectroscopic measurements may be processed and analyzed to determine the composition of the conduit contents. In addition, the spectroscopic measurements may be used in conjunction with correlations or other statistical models to determine one or more properties of interest of a constituent of the conduit contents. One or more processes upstream and/or downstream of the conduit may be adjusted in response to the determined composition or composition properties.
Abstract: Polymeric compositions and methods of making same having improved coefficient of friction and blocking properties. The polymeric compositions include a linear low density polyethylene with additives such as a fluoroelastomer and an acid scavenger. The polymeric compositions may further comprise other additives such as antiblock agents, slip agents, stabilization additives, or combinations thereof. The methods include adding additives such as a fluoroelastomer and an acid scavenger to a polymer resin and forming end use articles such as film from the polymeric compositions.
Type:
Grant
Filed:
November 2, 2005
Date of Patent:
September 2, 2008
Assignee:
Chevron Philips Chemical Company LP
Inventors:
Ashish M. Sukhadia, Elizabeth M. Lanier, Louis Moore
Abstract: A copolymer of ethylene and a higher alpha olefin, preferably 1-hexene, can be produced using an activated chromium containing catalyst system and a cocatalyst selected from the group consisting of trialkylboron, trialkylsiloxyalutninum, and a combination of trialkylboron and thalkylaluminum compounds. The polymerization process must be carefully controlled to produce a copolymer resin having an exceptionally broad molecular weight distribution, extremely high PENT ESCR values, and a natural branch profile that impacts branching preferably into the high molecular weight portion of the polymer. The resulting copolymer resin is especially useful in high stiffness pipe applications.
Type:
Grant
Filed:
November 23, 2004
Date of Patent:
April 24, 2007
Assignee:
Chevron Philips Chemical Company LP
Inventors:
Elizabeth A. Benham, Paul J. DesLauriers, Max P. McDaniel, Al R. Wolfe
Abstract: Methods of reducing the fluid loss from a wellbore servicing fluid include combining a terpolymer with the wellbore servicing fluid to reduce the fluid loss from the fluid, followed by displacing the fluid into a wellbore. In an embodiment, the following monomers are used to make the terpolymer: from about 75 wt. % to about 95 wt. % of 2-acrylamido-2-methylpropanesulfonic acid or an alkali salt thereof; from about 3 wt. % to about 15 wt. % of acrylamide; and from about 3 wt. % to about 15 wt. % of N-vinyl-2-pyrrolidone, all weight percentages being based on a total weight of the monomers. The wellbore servicing fluid may comprise water or an aqueous salt solution such as a formate solution. The wellbore servicing fluid may also comprise clay such as montmorillonite and attapulgite clay.