Patents Represented by Attorney Steven A. Owen
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Patent number: 8273872Abstract: Ionic liquids and cellulose ester compositions and processes for producing ionic liquids and cellulose esters. Cellulose esters can be produced by esterifying cellulose in a reaction medium comprising one or more halide ionic liquids and at least one binary component. Cellulose esters prepared via the methods of the present invention can have a degree of substitution (“DS”) of at least 1.5 and can comprise a plurality of ester substituents, where at least 50 percent of the ester substituents comprise alkyl esters having a carbon chain length of at least 6 carbons.Type: GrantFiled: August 25, 2011Date of Patent: September 25, 2012Assignee: Eastman Chemical CompanyInventors: Charles Michael Buchanan, Norma Lindsey Buchanan
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Patent number: 8236921Abstract: The invention provides improved energy content in and shaft power recovery from off-gas from xylene oxidation reactions while at the same time minimizing wastewater treatment cost. More shaft power is produced using off-gas than is required to drive the main air compressor, even with preferred, relatively low oxidation temperatures. Simultaneously, an amount of wastewater greater than byproduct water from oxidation of xylene is kept in vapor form and treated along with off-gas pollutants in a self-sustaining (self-fueling) gas-phase thermal oxidative destruction unit. Optionally, off-gas is combined from multiple xylene oxidation reactors, comprising primary and/or secondary oxidation reactors and forming TPA and/or IPA.Type: GrantFiled: March 30, 2012Date of Patent: August 7, 2012Assignee: Eastman Chemical CompanyInventors: Raymond Elbert Fogle, III, Ronald Buford Sheppard, Timothy Alan Upshaw, Alan George Wonders
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Patent number: 8188267Abstract: Ionic liquids and cellulose ester compositions and processes for producing ionic liquids and cellulose esters. Cellulose esters can be produced by esterifying cellulose in a reaction medium comprising one or more ionic liquids. Cellulose esters prepared via the methods of the present invention can be contacted with at least one bleaching agent to produce bleached cellulose esters having a ?E value of less than 30.Type: GrantFiled: August 11, 2008Date of Patent: May 29, 2012Assignee: Eastman Chemical CompanyInventors: Charles Michael Buchanan, Norma Lindsey Buchanan
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Patent number: 8158777Abstract: Ionic liquids and cellulose ester compositions and processes for producing ionic liquids and cellulose esters. Cellulose esters can be produced by esterifying cellulose in a reaction medium comprising one or more halide ionic liquids and at least one binary component. Cellulose esters prepared via the methods of the present invention can have a degree of substitution (“DS”) of at least 1.5 and can comprise a plurality of ester substituents, where at least 50 percent of the ester substituents comprise alkyl esters having a carbon chain length of at least 6 carbons.Type: GrantFiled: August 11, 2008Date of Patent: April 17, 2012Assignee: Eastman Chemical CompanyInventors: Charles Michael Buchanan, Norma Lindsey Buchanan
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Patent number: 8153782Abstract: Processes for recycling an ionic liquid comprising employing an initial ionic liquid as a solvent and/or reagent resulting in a modified ionic liquid and thereafter subjecting at least a portion of the modified ionic liquid to at least one anion exchange process to produce a reformed ionic liquid. The initial ionic liquid can be employed in a cellulose esterification process, thereby producing the modified ionic liquid. At least a portion of the reformed ionic liquid can be recycled to a point upstream in the cellulose esterification process.Type: GrantFiled: February 13, 2008Date of Patent: April 10, 2012Assignee: Eastman Chemical CompanyInventors: Charles Michael Buchanan, Norma Lindsey Buchanan
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Patent number: 8148518Abstract: Ionic liquids and cellulose ester compositions and processes and apparatus for producing ionic liquids and cellulose esters. Cellulose esters can be produced by dissolving cellulose in carboxylated ionic liquids and thereafter contacting the cellulose solution with at least one acylating reagent. Cellulose esters produced via the present invention can comprise ester groups that originate from the carboxylated ionic liquid and/or the acylating reagent.Type: GrantFiled: February 13, 2008Date of Patent: April 3, 2012Assignee: Eastman Chemical CompanyInventors: Charles Michael Buchanan, Norma Lindsey Buchanan, Robert Thomas Hembre, Juanelle Little Lambert
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Patent number: 8067488Abstract: This invention relates a cellulose solution comprising cellulose and at least one tetraalkylammonium alkylphosphate and processes to produce the cellulose solution. Another aspect of this invention relates to shaped articles prepared from a cellulose solution comprising cellulose and at least one tetraalkylammonium alkylphosphate. Another embodiment of this invention relates to compositions comprising derivatives of cellulose prepared from a cellulose solution comprising at least one tetraalkylammonium alkylphosphate. Another embodiment of this invention relates to compositions comprising regioselectively substituted cellulose esters prepared from a cellulose solution comprising cellulose and at least one tetraalkylammonium alkylphosphate. In another embodiment of the invention, the cellulose esters of the present invention are used as protective and compensation films for liquid crystalline displays.Type: GrantFiled: August 12, 2009Date of Patent: November 29, 2011Assignee: Eastman Chemical CompanyInventors: Charles Michael Buchanan, Norma Lindsey Buchanan, Elizabeth Guzman-Morales
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Patent number: 7977505Abstract: Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is para-xylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.Type: GrantFiled: April 18, 2008Date of Patent: July 12, 2011Assignee: Eastman Chemical CompanyInventors: Alan George Wonders, Lee Reynolds Partin, Wayne Scott Strasser, Marcel de Vreede, Puneet Gupta
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Patent number: 7919652Abstract: A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.Type: GrantFiled: March 1, 2006Date of Patent: April 5, 2011Assignee: Eastman Chemical CompanyInventors: Philip Edward Gibson, Kenny Randolph Parker, Ruairi Seosamh O'Meadhra
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Patent number: 7910071Abstract: Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is para-xylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.Type: GrantFiled: August 27, 2009Date of Patent: March 22, 2011Assignee: Eastman Chemical CompanyInventors: Alan George Wonders, Howard Wood Jenkins, Jr., Lee Reynolds Partin, Wayne Scott Strasser, Marcel de Vreede
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Patent number: 7902396Abstract: Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out in a bubble column reactor that provides for a highly efficient reaction at relatively low temperatures. When the oxidized compound is para-xylene and the product from the oxidation reaction is crude terephthalic acid (CTA), such CTA product can be purified and separated by more economical techniques than could be employed if the CTA were formed by a conventional high-temperature oxidation process.Type: GrantFiled: June 24, 2009Date of Patent: March 8, 2011Assignee: Eastman Chemical CompanyInventors: Alan George Wonders, Gino Georges Lavoie, Charles Edwan Sumner, Jr.
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Patent number: 7902395Abstract: Disclosed is a process and apparatus for treating a purge stream in a carboxylic acid production process. The process employs a purge process that allows for the separation of oxidation byproducts into benzoic acid and non-benzoic acid oxidation byproducts, thus providing flexibility in the treatment and use of such oxidation byproducts.Type: GrantFiled: August 16, 2007Date of Patent: March 8, 2011Assignee: Eastman Chemical CompanyInventors: Philip Edward Gibson, Kenny Randolph Parker
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Patent number: 7897810Abstract: Disclosed is an optimized process and apparatus for more efficiently producing aromatic dicarboxylic acids (e.g., terephthalic acid). In one embodiment the process/apparatus reduces costs by recovering and purifying residual terephthalic acid present in the liquid phase of an initial oxidation slurry. In another embodiment the process apparatus reduces costs associated with hydrogenation by forming a final composite product containing unhydrogenated acid particles.Type: GrantFiled: March 18, 2008Date of Patent: March 1, 2011Assignee: Eastman Chemical CompanyInventors: Robert Lin, Marcel de Vreede
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Patent number: 7897809Abstract: A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.Type: GrantFiled: August 27, 2007Date of Patent: March 1, 2011Assignee: Eastman Chemical CompanyInventors: Johannes Wilhelmus Sluijmers, Kenny Randolph Parker, Philip Edward Gibson, Marcel de Vreede, Ardie Heijblom
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Patent number: 7897808Abstract: Disclosed is a process and apparatus for treating a purge stream in a carboxylic acid production process. The process employs a purge process that allows for the separation of oxidation byproducts into benzoic acid and non-benzoic acid oxidation byproducts, thus providing flexibility in the treatment and use of such oxidation byproducts.Type: GrantFiled: January 19, 2007Date of Patent: March 1, 2011Assignee: Eastman Chemical CompanyInventors: Philip Edward Gibson, Kenny Randolph Parker
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Patent number: 7888529Abstract: A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.Type: GrantFiled: February 12, 2007Date of Patent: February 15, 2011Assignee: Eastman Chemical CompanyInventors: Kenny Randolph Parker, Philip Edward Gibson
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Patent number: 7888530Abstract: Disclosed is an optimized process and apparatus for more efficiently producing aromatic dicarboxylic acids (e.g., terephthalic acid). In one embodiment the process/apparatus reduces costs by recovering and purifying residual terephthalic acid present in the liquid phase of an initial oxidation slurry. In another embodiment the process apparatus reduces costs associated with hydrogenation by forming a final composite product containing unhydrogenated acid particles.Type: GrantFiled: July 14, 2005Date of Patent: February 15, 2011Assignee: Eastman Chemical CompanyInventors: Robert Lin, Marcel de Vreede
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Patent number: 7884233Abstract: A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.Type: GrantFiled: June 26, 2009Date of Patent: February 8, 2011Assignee: Eastman Chemical CompanyInventors: Philip Edward Gibson, Kenny Randolph Parker, Ronald Buford Sheppard
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Patent number: 7884231Abstract: A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.Type: GrantFiled: March 1, 2006Date of Patent: February 8, 2011Assignee: Eastman Chemical CompanyInventors: Kenny Randolph Parker, Philip Edward Gibson, Ruairi Seosamh O'Meadhra
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Patent number: 7880031Abstract: A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an enriched carboxylic acid composition. This invention also relates to a process and the resulting compositions for removing catalyst from a carboxylic acid composition to produce a post catalyst removal composition.Type: GrantFiled: March 1, 2006Date of Patent: February 1, 2011Assignee: Eastman Chemical CompanyInventors: Philip Edward Gibson, Kenny Randolph Parker