Methionine is one of the basic units for the protein formation.It is the only sulfur-containing variety in indispensable amino acids.Its addition into feed can promote the growth of livestock and poultry,increase the amount of lean meat and shorten the feeing cycle.The nutrition of 1kg methionine in animal feed is equal to 50kg fish powder and the usual addition amount is 0.05-0.2%.As the excess fishing and the discharge of sewage and industrial wastes into seas and oceans in the world in recent years have caused a quick reduction of the fish output,the output of fish powder as feed additive is not enough.The demand of methionine has therefore made a drastic increase.The major process technology being used in the world today for the commercial production of feed-grade methionine mainly takes methyl mercap-tan and acrylic aldehyde as raw-materials.Due to defects in scale,consumption and wastes,other production processes can in no way compete with this process technology.Propylene is used as raw material to produce acrylic aldehyde,and further produce methionine.It is the major technical route for the commercial production of methionine.
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