Abstract: The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles have a BET surface area of from 175 to 300+/?10% m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 3+/?10% to 40+/?10% nm and a mean minimum Feret diameter xFmin, mean of from 2+/?10% to 30+/?10% nm, both measured according to DIN ISO 9276-6 (2012).

Abstract: A method for preparing 3-hydroxy-3-methylbutyric acid (HMB) or salts thereof from tertbutanol and carbon monoxide, may include reacting tert-butanol in an aqueous mixture with carbon monoxide under electrolytic conditions. The electrolytic conditions may include applying an electric potential to the aqueous reaction mixture in a range of from 1.5 and 25 V and/or operating electrodes at a current density in a range of from 1 to 10.000 A/m2. The electric potential may be applied to the aqueous mixture using a diamond anode and/or a steel cathode. The reaction may be conducted in the presence of at least one conducting electrolyte.

Abstract: A method for preparing guanidino acetic acid involves reacting cyanamide and glycine in an aqueous reaction mixture in the presence of a base. The ammonia content in the reaction mixture is controlled to be below 20 g/L, and the dicyandiatrade content in the reaction mixture is kept below 5 wt.-%.

Abstract: A modified method for preparing guanidino acetic acid (GAA) involves reacting cyanamide with an excess molar amount of glycine in an aqueous reaction mixture, in the presence of a base. The method avoids high molar amounts of base or acid for pH control, and maintains the reaction selectivity and product yields.

Abstract: A modified method for preparing guanidino acetic acid (GAA) involves reacting cyanamide with an excess molar amount of glycine in an aqueous reaction mixture, in the presence of a base. The method avoids high molar amounts of base or acid for pH control, and maintains the reaction selectivity and product yields.

Abstract: The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles comprise from 50 to 100 wt.-% of CeO2, have a BET surface area of from 35 to 65 m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 10 to 40 nm and a mean minimum Feret diameter xFmin, mean of from 5 to 30 nm, both measured according to DIN ISO 9276-6 (2012).

Abstract: The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles have a BET surface area of from 175 to 300+/?10% m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 3+/?10% to 40+/?10% nm and a mean minimum Feret diameter xFmin, mean of from 2+/?10% to 30+/?10% nm, both measured according to DIN ISO 9276-6 (2012).

Abstract: The present invention pertains to a process for preparing 3-hydroxy-3-methylbutyrate (HMB) or a salt thereof, the method comprising (a) reacting isobutylene oxide with cyanide in order to obtain 3-hydroxy-3-methylbutyronitrile, and (b) hydrolyzing the 3-hydroxy-3-methylbutyronitrile obtained in step (a) in order to obtain HMB, wherein hydrolysis step (b) is performed using either at least one nitrilase enzyme or, alternatively, using a combination of enzymes, said combination comprising at least one nitrile hydratase and at least one amidase.

Abstract: The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles comprise from 50 to 100 wt.-% of CeO2, have a BET surface area of from 35 to 65 m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 10 to 40 nm and a mean minimum Feret diameter xFmin, mean of from 5 to 30 nm, both measured according to DIN ISO 9276-6 (2012).

Abstract: The present invention pertains to a process for preparing guanidino acetic acid (GAA) from cyanamide and glycine in alkaline process solution, in which anionic impurities are removed from the process solution by electrodialysis.

Abstract: The present invention pertains to a process for preparing guanidino acetic acid (GAA) from cyanamide and glycine in alkaline process solution, in which anionic impurities are removed from the process solution by electrodialysis.

Abstract: The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.

Abstract: The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.

Abstract: The invention relates to a process for converting ammonium salts of organic acids to the particular free organic acid, wherein an aqueous solution of the ammonium salt is contacted with an organic extractant and the salt is dissociated at temperatures and pressures at which the aqueous solution and the extractant are in the liquid state, and a stripping medium or entraining gas is introduced in order to remove NH3 from the aqueous solution and transfer at least a portion of the free organic acid formed to the organic extractant. The invention described here thus provides an improved process for releasing an organic acid, preferably a carboxylic, sulphonic or phosphonic acid, especially an alpha-hydroxycarboxylic acid or beta-hydroxycarboxylic acid, from the ammonium salt thereof by release and removal of ammonia and simultaneous extraction of the acid released with a suitable extractant from the aqueous phase. This process corresponds to a reactive extraction.

Abstract: A manganese dioxide catalyst for hydrolysing organic nitrites which bear readily oxidizable groups such as thiol or thioether groups to the corresponding carboxamides, and to a process for preparing the catalyst and to its use for hydrolysing organic nitrites.

Abstract: A manganese dioxide catalyst for hydrolysing organic nitrites which bear readily oxidizable groups such as thiol or thioether groups to the corresponding carboxamides, and to a process for preparing the catalyst and to its use for hydrolysing organic nitrites.

Abstract: A method for obtaining 2-hydroxy-4-methylthiobutyric acid (methionine-hydroxy analog, MHA) in primarily free form which is stable in storage by distilling a product solution containing MHA and by producing MHA product mixtures with improved storage stability from such a distillate. The distillate can be produced directly starting from MHA raw products from any MHA production process, which can optionally also contain solvent or water. The starting material may also be a commercial MHA product.