The application relates to a process for drying a composition comprising an alkali metal salt of a compound of general formula (I) R.sup.1R.sup.2NCHR.sup.3COOM or formula (II) R.sup.1R.sup.2NCHR.sup.3CHR.sup.3COOM, in particular N,N-dimethyl glycinate salt, and the use thereof. In the process, the composition, in particular the N,N-di methyl glycinate salt, is dried by feeding the composition into a fluidized bed dryer and subjecting the composition to a heat treatment by contacting the composition in the fluidized bed dryer with a drying gas stream, and during the heat treatment a solution or dispersion of the composition is sprayed onto at least a portion of the composition present in the fluidized bed dryer, or alternatively or in addition the composition, in particular N,N-dimethyl glycinate salt, is fed into a fluidized bed dryer and subjected to heat treatment in the fluidized bed dryer by contacting the composition with a drying gas stream, and the temperature of the composition in the fluidized bed during the heat treatment does not exceed 50 C.

The application relates to a process for drying a composition comprising an alkali metal salt of a compound of general formula (I) R.sup.1R.sup.2NCHR.sup.3COOM or formula (II) R.sup.1R.sup.2NCHR.sup.3CHR.sup.3COOM, in particular N,N-dimethyl glycinate salt, and the use thereof. In the process, the composition, in particular the N,N-di methyl glycinate salt, is dried by feeding the composition into a fluidized bed dryer and subjecting the composition to a heat treatment by contacting the composition in the fluidized bed dryer with a drying gas stream, and during the heat treatment a solution or dispersion of the composition is sprayed onto at least a portion of the composition present in the fluidized bed dryer, or alternatively or in addition the composition, in particular N,N-dimethyl glycinate salt, is fed into a fluidized bed dryer and subjected to heat treatment in the fluidized bed dryer by contacting the composition with a drying gas stream, and the temperature of the composition in the fluidized bed during the heat treatment does not exceed 50 C.

The present invention provides a process for the preparation of vigabatrin of formula (I) comprising of dissolving vigabatrin in water, optionally treating with charcoal, filtering and adding an acid to the reaction mass followed by the addition of an organic solvent and then isolating vigabatrin of formula (I) with high purity.

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The present invention provides a process for the preparation of vigabatrin of formula (I) comprising of dissolving vigabatrin in water, optionally treating with charcoal, filtering and adding an acid to the reaction mass followed by the addition of an organic solvent and then isolating vigabatrin of formula (I) with high purity.

##STR00001##

Disclosed are compounds having the following formula: (I) wherein R is an alkane chain having between 8 and 20 carbon atoms, and A is one or more anions having a total charge of 2; or R is a quaternary amine having the following formula: (Ia) wherein Ra and Rb are each an alkane chain having between 8 and 20 carbon atoms, and A is one or more anions having a total charge of 3. ##STR00001##

Disclosed are compounds having the following formula: (I) wherein R is an alkane chain having between 8 and 20 carbon atoms, and A is one or more anions having a total charge of 2; or R is a quaternary amine having the following formula: (Ia) wherein Ra and Rb are each an alkane chain having between 8 and 20 carbon atoms, and A is one or more anions having a total charge of 3. ##STR00001##

The present invention relates to a method for preparing a glutamate-based surfactant. More specifically, the present invention provides a method for preparing a glutamate-based surfactant, the method being very economical and being capable of mass production of the glutamate-based surfactant.

The present invention relates to a method for preparing a glutamate-based surfactant. More specifically, the present invention provides a method for preparing a glutamate-based surfactant, the method being very economical and being capable of mass production of the glutamate-based surfactant.

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.

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.