Method for preparing 2-hydroxy-4-methylthiobutyronitrile or the selenium equivalent thereof, and applications

    公开(公告)号:US20240076267A1

    公开(公告)日:2024-03-07

    申请号:US18280388

    申请日:2022-03-04

    IPC分类号: C07C319/20 C07C319/28

    CPC分类号: C07C319/20 C07C319/28

    摘要: A method for the preparation of the 2-hydroxy-4-methylthiobutyronitrile (HMTBN) or its selenium equivalent (HMSeBN) from hydrocyanic acid and 3-methylthiopropanal (MTP) or the corresponding selenium aldehyde (MSeP) includes the following steps: the molar ratio of the HCN to MTP or to MSeP is adjusted to a value greater than or equal to 1 and the pH is adjusted and maintained at a value greater than or equal to 3.5, to obtain a reaction medium in which the HMTBN or the HMSeBN is formed, then the pH of the reaction medium is lowered to a value less than or equal to 2.5 and the HCN is extracted from the reaction medium, and the HMTBN or the HMSeBN is recovered. The applications of this method are also related.