Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2006-06-29
2010-11-09
Zucker, Paul A (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
Reexamination Certificate
active
07829740
ABSTRACT:
A process for producing lactic acid according to the invention is characterized in that glycerin is subjected to a hydrothermal reaction under an alkaline condition at a temperature in the range of 150 to 400° C. and under pressure equal to or more than the saturated vapor pressure at the temperature. The glycerin produced from plant fats, animal fats or the like or pure product synthesized chemically or a discharge containing glycerin generated at the production of diesel fuel oil from fats, in which the fats are subjected to a transesterification with alcohol in the presence of an alkali catalyst in order to obtain fatty acid ester is preferably used as a starting material.
REFERENCES:
patent: 5034105 (1991-07-01), Berglund et al.
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patent: 11-342379 (1999-12-01), None
patent: 2005-200340 (2005-07-01), None
Hisanori Kishida, et al. “Conversion of Glycerin into Lactic Acid by Alkaline Hydrothermal Reaction” Chemistry Letters, vol. 34, No. 11, 2005, pp. 1560-1561.
Enomoto Heiji
Jin Fangming
Kakeda Kenji
Kishida Hisanori
Moriya Takehiko
Enomoto Heiji
Hitachi Zosen Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Tohoku Electric Power Co. Inc.
Zucker Paul A
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