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1. 发明专利

JP2003104962A METHOD FOR PRODUCING METHIONINE 审中-公开
公开(公告)号：JP2003104962A
公开(公告)日：2003-04-09
申请号：JP2001299628
申请日：2001-09-28
申请人： NIPPON SODA CO
发明人： KOGA TAKEOMI , OKUBO TOSHIMICHI
IPC分类号： C07C319/20 , C07C323/58
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive material usable for the reactor for hydrolyzing 5-(2-methylmercaptoethyl)hydantoin in the step of producing methionine. SOLUTION: This material of the equipment for the step of producing methionine by hydrolyzing the 5-(2-methylmercaptoethyl)hydantoin in the presence of an alkali at

2. 发明专利

JP2004175715A Method for crystallizing methionine 审中-公开
公开(公告)号：JP2004175715A
公开(公告)日：2004-06-24
申请号：JP2002343415
申请日：2002-11-27
申请人： Nippon Soda Co Ltd , 日本曹達株式会社
发明人： ISHII HIROYUKI , KOGA TAKEOMI , SATO MASAYUKI
IPC分类号： C07C319/28 , C07C319/20 , C07C323/58
CPC分类号： Y02P20/142
摘要： PROBLEM TO BE SOLVED: To provide a method for stably obtaining methionine crystal having desired water content and volume-average particle size. SOLUTION: The method for crystallizing methionine comprises feeding carbon dioxide into an aqueous solution containing methionine and respective salts of a compound(a) and a compound(b). Specifically, this method includes the steps of measuring the respective concentrations of the methionine, the compound(a) and the compound(b) in the aqueous solution to determine the respective weight percentages B and C(%) based on the coexistent methionine, substituting A( methionine concentration(wt.%) of the aqueous solution ), B and C in formula(1): W=K×(A) α ×(B) β ×(C) γ ×(D) δ ( wherein, W is the water content(wt%) of the methionine crystal, C is volume-average particle size(μm), and α, β, γ, δ and K are each a constant ) to obtain a correlation formula, and adjusting the respective concentrations of the methionine, the compound(a) and the compound(b) in the aqueous solution so that W and D meeting the correlation formula fall within specified ranges, respectively. COPYRIGHT: (C)2004,JPO

3. 发明专利

JP2003104960A METHOD FOR PRODUCING METHIONINE 审中-公开
公开(公告)号：JP2003104960A
公开(公告)日：2003-04-09
申请号：JP2001299626
申请日：2001-09-28
申请人： NIPPON SODA CO
发明人： MIYAMOTO HIROYUKI , KOGA TAKEOMI , ONO IPPEI
IPC分类号： C07C319/20 , C07C323/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing methionine involving a method for diminishing the corrosion of the material of the equipment for producing 5-(2-methylmercaptoethyl)hydantoin as the raw material for the methionine and using a highly corrosion-resistant material as the above material. SOLUTION: This method for producing the methionine involves the step of producing the 5-(2-methylmercaptoethyl)hydantoin as the raw material therefor by reaction between 3-methylmercaptopropionaldehyde, an aqueous solution containing hydrogen cyanide or a salt thereof, ammonia and carbon dioxide, between 3-methylmercaptopropionaldehyde, an aqueous solution containing hydrogen cyanide or a salt thereof and ammonium bicarbonate, between 3- methylmercaptopropionaldehyde and ammonium bicarbonate, between 3- methylmercaptopropionaldehyde cyanhydrin, ammonia and carbon dioxide, or between components capable of forming the above-mentioned components, optionally in the presence of water; wherein as the reaction vessel for the above step, a vessel packed with a material subject to corrosion under the above reaction conditions is installed.

4. 发明专利

JP2003104961A METHOD FOR PRODUCING METHIONINE 审中-公开
公开(公告)号：JP2003104961A
公开(公告)日：2003-04-09
申请号：JP2001299627
申请日：2001-09-28
申请人： NIPPON SODA CO
发明人： KOGA TAKEOMI , ONO IPPEI
IPC分类号： C07C319/20 , C07B61/00 , C07C323/58 , C22C38/00 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a material of the equipment for hydrolyzing 5-(2- methylmercaptoethyl)hydantoin as the raw material for methionine, having high corrosion resistance, good at hot processability at issue in equipment processing and reduced in the risk of breakage due to thermal expansion/ contraction. SOLUTION: This material of the equipment for the step of producing methionine by hydrolyzing the 5-(2-methylmercaptoethyl)hydantoin in the presence of an alkali is a stainless steel including at least one component selected from the group consisting of 16.0-35.0 wt.% Cr, 1-6 wt.% Mo,

5. 发明专利

JP2003104958A METHOD FOR PRODUCING METHIONINE 审中-公开
公开(公告)号：JP2003104958A
公开(公告)日：2003-04-09
申请号：JP2001299624
申请日：2001-09-28
申请人： NIPPON SODA CO
发明人： KOGA TAKEOMI , TSUCHIYA YASUHIRO , OKUBO TOSHIMICHI
IPC分类号： C07C319/20 , C07C323/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing methionine involving using a highly corrosion-resistant material of the equipment for producing the raw material for the methionine. SOLUTION: This method for producing methionine or a salt thereof comprises the steps of producing 5-(2-methylmercaptoethyl)hydantoin by reaction between 3-methylmercaptopropionaldehyde, an aqueous solution containing hydrogen cyanide or a salt thereof, ammonia (or acetonecyanhydrin) and carbon dioxide (or ammonium bicarbonate) optionally in the presence of water and then hydrolyzing the thus produced 5-(2-methylmercaptoethyl)hydantoin; wherein as the material of the equipment for producing the 5-(2-methylmercaptoethyl) hydantoin, a material lined with a fluororesin as a copolymer composed of perfluoroalkane skeleton recurring unit is used.

6. 发明专利

JP2003104963A METHOD FOR PRODUCING METHIONINE 审中-公开
公开(公告)号：JP2003104963A
公开(公告)日：2003-04-09
申请号：JP2001299630
申请日：2001-09-28
申请人： NIPPON SODA CO
发明人： KOGA TAKEOMI , OKUBO TOSHIMICHI
IPC分类号： C07C319/20 , C07C323/58
摘要： PROBLEM TO BE SOLVED: To provide a highly corrosion-resistant material of the equipment for the step of producing methionine or a salt thereof by hydrolyzing 5-(2- methylmercaptoethyl)hydantoin. SOLUTION: This material of the equipment for the step of producing methionine or a salt thereof by hydrolyzing 5-(2-methylmercaptoethyl)hydantoin in the presence of an alkali is a material lined with a fluororesin as a copolymer composed of perfluoroalkane skeleton recurring unit.

7. 发明专利

JP2003104959A METHOD FOR PRODUCING METHIONINE 审中-公开
公开(公告)号：JP2003104959A
公开(公告)日：2003-04-09
申请号：JP2001299625
申请日：2001-09-28
申请人： NIPPON SODA CO
发明人： SUDO MASAJI , MARUYAMA MICHIAKI , KOGA TAKEOMI
IPC分类号： C07C319/20 , C07C323/58
摘要： PROBLEM TO BE SOLVED: To provide a method for producing methionine involving using a highly corrosion-resistant material for the production equipment. SOLUTION: This method for producing methionine or a salt thereof comprises the steps of producing 5-(2-methylmercaptoethyl)hydantoin by reaction between 3-methylmercaptopropionaldehyde, an aqueous solution containing hydrogen cyanide or a salt thereof, ammonia (or aldehydecyanhydrin) and carbon dioxide (or ammonium bicarbonate) optionally in the presence of water and then hydrolyzing the thus produced 5-(2-methylmercaptoethyl)hydantoin; wherein as the material of the equipment for producing the 5-(2-methylmercaptoethyl) hydantoin, a Ni-based alloy including 18-25 wt.% Cr and 11-24 wt.% Mo is used.

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