Patents by Inventor U. Hwang Lee
U. Hwang Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9687772Abstract: The present invention relates to a nitrogen adsorbent having nitrogen selective adsorptivity by including an organic-inorganic hybrid nanoporous material having a coordinatively unsaturated metal site with density of 0.2 mmol/g to 10 mmol/g in a skeleton, surface or pore; and use thereof, such as a device separating nitrogen from a gas mixture containing nitrogen and methane, a pressure swing adsorption separation device and a temperature swing adsorption separation device for separating nitrogen provided, a method for separating nitrogen and methane from a gas mixture containing nitrogen and methane, a device for separating nitrogen, oxygen or argon, a method for separating nitrogen, oxygen or argon from a gas mixture containing nitrogen, oxygen or argon, and a method for preparing nitrogen or high purity inert gas all separated from a gas mixture containing nitrogen and inert gas.Type: GrantFiled: September 25, 2015Date of Patent: June 27, 2017Assignee: Korea Research Institute of Chemical TechnologyInventors: Jong-San Chang, Young Kyu Hwang, Ji Woong Yoon, Do-Young Hong, U-Hwang Lee, Sukyung Lee, Kyung Ho Cho, Dong Won Hwang, Youn-Sang Bae, Seung-Joon Lee
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Publication number: 20170101390Abstract: The present invention relates to a method and apparatus for preparation of lactide using a lactide purification process, comprising introducing an aqueous solution comprising lactic acid into a reactor filled with a catalyst and reacting the same to produce crude lactide vapor; and purifying the crude lactide vapor to produce lactide crystals, wherein a first purification comprises collecting and crystallizing the crude lactide vapor using a first solvent to produce lactide crystals, and separating the lactide crystal from a residue through filtration.Type: ApplicationFiled: October 11, 2016Publication date: April 13, 2017Inventors: Dong Won HWANG, Jong San CHANG, Young Kyu HWANG, U Hwang LEE, Do Young HONG, Su Kyung LEE, Kyung Ho CHO, Pravin Pandharinath UPARE
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Patent number: 9561492Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.Type: GrantFiled: September 29, 2015Date of Patent: February 7, 2017Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Dong Won Hwang, Jong-San Chang, Pravin P. Upare, U-Hwang Lee, Young Kyu Hwang
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Patent number: 9539561Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.Type: GrantFiled: April 24, 2013Date of Patent: January 10, 2017Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Dong Won Hwang, Jong-San Chang, Pravin P. Upare, U-Hwang Lee, Young Kyu Hwang
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Publication number: 20160304480Abstract: The present invention relates to a method for preparing for a furan derivative from biomass, comprising step (1) of preparing 5-hydroxymethylfurfural by reacting biomass and a solid acid catalyst in butanol; and step (2) of preparing a furan derivative by reacting the butanol solution of 5-hydroxymethylfurfural, obtained in step (1), with a hydrogenation catalyst.Type: ApplicationFiled: April 14, 2016Publication date: October 20, 2016Inventors: Dong Won HWANG, Pravin P. UPARE, Jong San CHANG, Young Kyu HWANG, U Hwang LEE, Do Young HONG
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Publication number: 20160158708Abstract: Disclosed herein is polymer membrane for gas separation or concentration which contains a hybrid nanoporous material, an application thereof, and a manufacturing method thereof. Especially, the hybrid nanoporous material has a window size of 4 ? to 15 ? or has gas adsorption characteristics for a gas to be separated, which is different from those for other gases, and thus the present invention may provide the polymer membrane having improved gas permeation selectivity, an application thereof, and a manufacturing method thereof.Type: ApplicationFiled: December 4, 2015Publication date: June 9, 2016Inventors: U-Hwang LEE, Jong San CHANG, Young Kyu HWANG, You In PARK, Hye Rim SONG, Seung Eun NAM, Do Young HONG, Sue Kyung LEE, Kyung Ho CHO
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Patent number: 9302258Abstract: The present invention relates to a complex and a method for manufacturing same, the complex comprising: at least one crystalline hybrid nanoporous material powder, in which a metal ion, or a metal ion cluster to which oxygen is bound, and an organic ligand, or the organic ligand and a negative ion ligand are in a coordinate covalent bond; and at least one organic polymer additive, or at least one organic polymer additive and an inorganic additive, wherein the shape of the complex is spherical or pseudo-spherical, the size of the complex is 0.1 to 100 mm, a total volume of pores is 5 or more volume % based on the sum of a total volume of nanoporous material having a size of at most 10 nm and a total volume of pores having a size of at least 0.1 ?m, and wherein a non-surface value per weight (m2/g) of the complex as at least 83% of a non-surface value per weight (m2/g) of the nanoporous material powder.Type: GrantFiled: August 14, 2012Date of Patent: April 5, 2016Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Jong-San Chang, U-Hwang Lee, Young Kyu Hwang, Dong Won Hwang, You-Kyong Seo, Ji Sun Lee, Ji Woong Yoon, Kyu Eun Shim
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Publication number: 20160089637Abstract: The present invention relates to a nitrogen adsorbent having nitrogen selective adsorptivity by including an organic-inorganic hybrid nanoporous material having a coordinatively unsaturated metal site with density of 0.2 mmol/g to 10 mmol/g in a skeleton, surface or pore; and use thereof, such as a device separating nitrogen from a gas mixture containing nitrogen and methane, a pressure swing adsorption separation device and a temperature swing adsorption separation device for separating nitrogen provided, a method for separating nitrogen and methane from a gas mixture containing nitrogen and methane, a device for separating nitrogen, oxygen or argon, a method for separating nitrogen, oxygen or argon from a gas mixture containing nitrogen, oxygen or argon, and a method for preparing nitrogen or high purity inert gas all separated from a gas mixture containing nitrogen and inert gas.Type: ApplicationFiled: September 25, 2015Publication date: March 31, 2016Inventors: Jong-San Chang, Young Kyu Hwang, Ji Woong Yoon, Do-Young Hong, U-Hwang Lee, Sukyung Lee, Kyung Ho Cho, Dong Won Hwang, Youn-Sang Bae, Seung-Joon Lee
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Publication number: 20160016151Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.Type: ApplicationFiled: September 29, 2015Publication date: January 21, 2016Inventors: Dong Won HWANG, Jong-San CHANG, Pravin P. UPARE, U-Hwang LEE, Young Kyu HWANG
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Patent number: 9175025Abstract: The present invention relates to a method for preparing a porous organic-inorganic hybrid, which comprises gelling a reaction mixture containing a metal precursor, a water-soluble additive and water or water-containing organic solvent at a gelling temperature of 30° C.˜100° C. to obtain an organogel-containing solution having a viscosity of 2 to 50,000 (cps), subsequently ageing the solution at said gelling temperature under stirring; and subsequently heating the organogel-containing solution at a temperature between said gelling temperature and 250° C. to crystallize the solution.Type: GrantFiled: June 1, 2012Date of Patent: November 3, 2015Assignee: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: U-Hwang Lee, Jong-San Chang, Young Kyu Hwang, You-Kyong Seo, Christian Serre, Patricia Horcajada Cortes, Hubert Chevreau, Florence Ragon, Thomas Devic
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Publication number: 20150292058Abstract: The present invention relates to a method for recovering indium in a high selectivity and a high efficiency from an indium-containing solution, dispersion or mixture such as seawater, industrial water, waste water, cooling water, a solution extracted from wastes of electronic products such as display panel, or the like.Type: ApplicationFiled: January 18, 2013Publication date: October 15, 2015Inventors: U-Hwang Lee, Jong-San Chang, Sue Kyung Lee, Young Kyu Hwang, Dong Won Hwang, Da Hye Jeon, Kyu Eun Shim
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Publication number: 20150258489Abstract: The invention relates to a cyclical method for producing a nitrogen fraction, the purity of which is greater than or equal to 95 mol %, and a hydrocarbon-enriched fraction from a filler containing nitrogen and a hydrocarbon, said method using a specific class of porous hybrid solids as an adsorbent in a pressure-swing adsorption (PSA) process. The invention also relates to equipment for implementing said method.Type: ApplicationFiled: July 9, 2012Publication date: September 17, 2015Applicants: TOTAL PETROCHEMICALS FRANCE, UNIVERSIDADE DO PORTO, (UPORTO) Faculdade de Engenharia, KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Francis Luck, Catherine Leroi, Alvaro Fernandez, Ana Mafalda Almeida Peixoto Ribeiro, Joao Carlos Godinho De Faria Dos Santos, Alirio Egidio Rodrigues, Jong-San Chang, U-Hwang Lee, Young Kyu Hwang, Jean-Patrick Bonne
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Publication number: 20150239863Abstract: The present invention provides a method for directly producing lactide by subjecting lactic acid to a dehydration reaction in the presence of a catalyst comprising a tin compound, preferably, a tin (IV) compound, wherein lactide can be produced directly or by one step from lactic acid, without going through the step of producing or separating lactic acid oligomer. The method of the present invention has advantages of causing no loss of lactic acid, having a high conversion ratio to lactic acid and a high selectivity to optically pure lactide, and maintaining a long life time of the catalyst. Further, since lactic acid oligomer is not or hardly generated and the selectivity of meso-lactide is low, the method also has an advantage that the cost for removing or purifying this can be saved.Type: ApplicationFiled: April 24, 2013Publication date: August 27, 2015Inventors: Dong Won Hwang, Jong-San Chang, Pravin P. Upware, U-Hwang Lee, Young Kyu Hwang
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Patent number: 9012685Abstract: A method for recovery of highly pure alkyl lactate and lactic acid is provided, which includes a step 1 for producing source liquid comprising lactic acid or ammonium lactate; a step 2 for dehydrating the source liquid product of step 1; a step 3 for producing liquid mixture by sequentially adding and stirring alcohol and acid solution to the dehydrated source liquid; a step 4 for separating and removing ammonium salt precipitation from the liquid mixture of step 3; a step 5 for producing alkyl lactate from ammonium salt-free liquid mixture by esterification reaction; and a step 6 for separating alcohol and alkyl lactate by distillation from the mixture of step 5.Type: GrantFiled: December 2, 2011Date of Patent: April 21, 2015Assignee: Korea Research Institute of Chemical TechnologyInventors: Dong Won Hwang, Jong-San Chang, Young Kyu Hwang, U-Hwang Lee, HyoJin Gwak
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Publication number: 20140287235Abstract: The present invention relates to a complex and a method for manufacturing same, the complex comprising: at least one crystalline hybrid nanoporous material powder, in which a metal ion, or a metal ion cluster to which oxygen is bound, and an organic ligand, or the organic ligand and a negative ion ligand are in a coordinate covalent bond; and at least one organic polymer additive, or at least one organic polymer additive and an inorganic additive, wherein the shape of the complex is spherical or pseudo-spherical, the size of the complex is 0.1 to 100 mm, a total volume of pores is 5 or more volume % based on the sum of a total volume of nanoporous material having a size of at most 10 nm and a total volume of pores having a size of at least 0.1 ?m, and wherein a non-surface value per weight (m2/g) of the complex as at least 83% of a non-surface value per weight (m2/g) of the nanoporous material powder.Type: ApplicationFiled: August 14, 2012Publication date: September 25, 2014Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Jong-San Chang, U-Hwang Lee, Young Kyu Hwang, Dong Won Hwang, You-Kyong Seo, Ji Sun Lee, Ji Woong Yoon, Kyu Eun Shim
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Publication number: 20140200361Abstract: The present invention relates to a method for preparing a porous organic-inorganic hybrid, which comprises gelling a reaction mixture containing a metal precursor, a water-soluble additive and water or water-containing organic solvent at a gelling temperature of 30° C.˜100° C. to obtain an organogel-containing solution having a viscosity of 2 to 50,000 (cps), subsequently ageing the solution at said gelling temperature under stirring; and subsequently heating the organogel-containing solution at a temperature between said gelling temperature and 250° C. to crystallize the solution.Type: ApplicationFiled: June 1, 2012Publication date: July 17, 2014Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: U-Hwang Lee, Jong-San Chang, Young Kyu Hwang, You-Kyong Seo, Christian Serre, Patricia Horcajada, Hubert Chevreau, Florence Ragon, Thomas Devic
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Publication number: 20120142945Abstract: A method for recovery of highly pure alkyl lactate and lactic acid is provided, which includes a step 1 for producing source liquid comprising lactic acid or ammonium lactate; a step 2 for dehydrating the source liquid product of step 1; a step 3 for producing liquid mixture by sequentially adding and stirring alcohol and acid solution to the dehydrated source liquid; a step 4 for separating and removing ammonium salt precipitation from the liquid mixture of step 3; a step 5 for producing alkyl lactate from ammonium salt-free liquid mixture by esterification reaction; and a step 6 for separating alcohol and alkyl lactate by distillation from the mixture of step 5.Type: ApplicationFiled: December 2, 2011Publication date: June 7, 2012Applicant: KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGYInventors: Dong Won HWANG, Jong-San CHANG, Young Kyu HWANG, U-Hwang LEE, HyoJin GWAK
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Publication number: 20090208737Abstract: There are provided lamella structured thin films having ultralow dielectric constants and high hardness, and the method for manufacturing the same. In the lamella structured thin film, silica layers and air layers are alternately and repeatedly stacked on the surface of a wafer in the vertical direction. The method of manufacturing the lamella structured thin film includes, agitating silica sol solution containing surfactant and silica precursor, spin-coating the solution on silicon wafer, aging the wafer, and annealing the wafer to remove the surfactant and organic materials from the wafer. The lamella structured thin film has excellent mechanical strength and high chemical stability, and in particular, has significantly low dielectric constant of no more than 2.5 and high hardness. In the method of manufacturing the lamella structured thin film, semiconductor processes can be made simple and economical since only pure silica is used and no additionally surface treatment is performed.Type: ApplicationFiled: January 12, 2009Publication date: August 20, 2009Applicant: Sungkyunkwan University Foundation for Corporate CollaborationInventors: Young Uk Kwon, U. Hwang Lee, Hyun Ju Lee, Ki Rim Lee