An object of the present invention to provide a method for producing methionine with consideration given to the environment. The production method of the present invention comprises a removal step of blowing an inert gas into a liquid containing 5-(2-methylmercaptoethyl)hydantoin and thereby diffusing ammonia remaining in the liquid to obtain an emission gas containing the ammonia, and a recovery step of bringing the emission gas into contact with a washing liquid to recover ammonia contained in the emission gas.
A New Method for the Synthesis of Symmetrical Disubstituted Pyrazines
作者:Nora Rojas、Yvonne Grillasca、Alejandrina Acosta、Irene Audelo、Gustavo García de la Mora
DOI:10.1002/jhet.1748
日期:2013.7
Through the self‐condensation of α‐amino aldehydes, the synthesis of symmetrical disubstitutedpyrazines was achieved in a three‐step one‐pot reaction. The α‐amino aldehydes were easily obtained by treating methyl esters of natural α‐amino acids with diisobutylaluminium hydride.