Optimized methionine preparation method based on sulfuric acid indirect acidification method

The invention relates to the field of methionine production, in particular to an optimized methionine preparation method based on a sulfuric acid indirect acidification method. Compared with the prior art, the optimized methionine preparation method based on the sulfuric acid indirect acidification method has the advantages that aiming at the sodium hydroxide hydrolysate of hydantoin, the pH value of a sodium sulfate solution is adjusted to be alkaline to discharge ammonia, the pH value of a methionine concentrated solution is adjusted to be alkaline to decompose a methionine derivative precursor, impurities are extracted into beneficial substances through extraction and gas stripping, and beneficial resources are respectively purified, so that the method is environment-friendly, economical and safe, and has wide market value. 本发明涉及蛋氨酸生产领域，具体涉及基于硫酸间接酸化法的蛋氨酸优化制备方法。与现有技术相比，本发明的基于硫酸间接酸化法的蛋氨酸优化制备方法，针对乙内酰脲的氢氧化钠水解液，通过将硫酸钠溶液调节pH为碱性将氨排出，将蛋氨酸浓缩液调节pH为碱性将蛋氨酸衍生前体分解，通过萃取和气提将杂质提取为有益物质，将有益资源分别提纯处理，环保、经济、安全，具有广泛的市场价值。