Abstract: The invention concerns a continuous process for manufacturing methionine by alkaline hydrolysis of methionine hydantoin in aqueous phase, removing NH3 and CO2 of the hydrolysis medium, and neutralizing the obtained methioninate salt, according to which, after removal of NH3 and CO2, the hydrolysis reaction medium is concentrated to precipitate Na2CO3, said Na2CO3 being separated then recycled for alkaline hydrolysis, the latter being carried out in the presence of NaOH and Na2CO3.

Abstract: The invention concerns a continuous process for manufacturing methionine by alkaline hydrolysis of methionine hydantoin in aqueous phase, removing NH3 and CO2 of the hydrolysis medium, and neutralizing the obtained methioninate salt, according to which, after removal of NH3 and CO2, the hydrolysis reaction medium is concentrated to precipitate Na2CO3, said Na2CO3 being separated then recycled for alkaline hydrolysis, the latter being carried out in the presence of NaOH and Na2CO3.

Abstract: The invention provides an appliance for localized heating of a polymer material surface to be repaired by blowing a hot fluid inside a confinement chamber (2) that is defined by a deformable cap (1). The cap (1) is made of a blanket (6) incorporating a framework (7) for shaping the confinement chamber (2) under the effect of tensions applied locally by the framework (7) to the blanket (6) in its general plane (P). Force generator means (9) cause the framework (7) to change between a flexible state in which the framework (7) is arranged in the general plane of the blanket (6), and a rigid state for shaping the confinement chamber (2). The force generator means (9) comprise a force generator source that produces a suction, and the framework (7) is made up of strips of felt (8, 8?) housed in a pouch of the blanket (6).

Abstract: Preparation process for .alpha.,.beta.-dicarbonylated compounds of formula (I) ##STR1## in which R.sub.2 =alkyl, phenyl or benzyl being able to be substituted in various ways on the cycle, or carboxylic ester, and R.sub.3 =alkyl or alkoxy or carboxylic ester in which a compound of formula (II) ##STR2## in which R.sub.1 =alkyl, or alkyl .alpha.-ketocarboxylate or carboxylic ester, and R.sub.2 and R.sub.3 have the same meanings as previously is reacted in a nitrile type solvent, with molecular oxygen in the presence of copper.sup.II nitrate or ferric chloride as catalyst, and use for obtaining ethyl .alpha.-ketobutyrate, ethyl phenyl pyruvate, ethyl pyruvate, ethyl phenylglyoxylate, butane-2,3-dione or diethyl mesoxalate.