| abstract |
The invention relates to a method and a device for continuously producing D,L-methionine by using crude hydrocyanic acid. The device includes hydrocyanic acid synthesis tower, acid tower, multi-stage series tank reactor, static mixing reactor I, stripping tower I, static mixing reactor II, tank reactor, stripping tower II and neutralization tank ; Method for continuous production of D,L-methionine, including preparation of cyanic acid mixture gas II, preparation of 2-hydroxy-4-methylthiobutyronitrile in multi-stage series tank reactors, static mixing reactor I Preparation of 2-amino-4-methylthiobutyronitrile in static mixing reactor II neutralization tank reactor to prepare D, L-methionine potassium, and neutralization in the neutralization tank to prepare D, L-methionine thionine. The products or reaction residues are also treated by using low-temperature storage tanks, incinerators, stripping towers and washing tanks. The device and method of the present invention utilize crude hydrocyanic acid and crude methylthiopropanal to continuously produce D,L-methionine, which has low production cost, few side reactions and high yield, and can realize industrialized large-scale continuous production . |