Additive used in the preparation process of methionine and the preparation method of methionine
A technology for the preparation of methionine, applied in the field of additives, can solve problems affecting the stable operation of the continuous crystallization process, loss of regulation, defoaming effect, unstable crystallization process, etc., to achieve good crystal form, high bulk density, and flow good sex effect
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preparation example Construction
[0079] During the preparation of methionine, a large amount of foam will be produced due to the need to feed carbon dioxide when obtaining the crude product of methionine crystallization. It will affect the stable operation of the system, and affect the shape and bulk density of the product, so it is necessary to use component B to suppress foam. In the presence of B component, A component and C component can form an emulsified state and disperse in the system.
[0080] The C component is a silicone oil with enhanced defoaming effect, which eliminates the foam generated during the crystallization process, stabilizes the crystallization environment, improves the smoothness of the crystallization, and makes the product have good fluidity.
[0081] The C component includes dimethyl silicone oil, hydroxyl silicone oil or hydrogen silicone oil. The preferred dynamic viscosity of component C at 25°C is 90mm 2 / s~1500mm 2 / s.
[0082] In the process of hydrolyzing 5-(2-methylthio...
Embodiment 1
[0103] The additive of this example is, sodium stearyl methyl taurate accounts for 6wt%, has the molecular weight that is 3000 and the polyoxyethylene polyoxypropylene ether graft silicone oil of HLB value 10 accounts for 6wt%, dynamic viscosity under 25 ℃ 90mm 2 / s of hydroxy silicone oil accounted for 3wt%, the rest is an aqueous mixture of water.
[0104] (1) In the methionine salt solution obtained by hydrolysis of 5-(2-methylthioethyl)hydantoin, add an additive based on the methionine salt solution at 300 ppm, and feed carbon dioxide under stirring , methionine crystals were precipitated in the form of reaction crystallization, and the crude methionine crystals were obtained by filtration.
[0105] (2) Put the above-mentioned methionine crystal crude product into the dissolution kettle, add appropriate amount of water and / or crystallization mother liquor to prepare a methionine suspension with a solid content of 11wt%, and add the suspension based on the methionine solut...
Embodiment 2
[0109] The additive of this example is, sodium cocoyl methyl taurate accounts for 2wt%, has the molecular weight that is 6000 and the polyoxyethylene polyoxypropylene ether graft silicone oil of HLB value 12 accounts for 2wt%, dynamic viscosity under 25 ℃ 1500mm 2 / s simethicone oil accounts for 1wt%, and the rest is an aqueous mixture of water.
[0110] (1) In the methionine salt solution obtained by the hydrolysis of 5-(2-methylthioethyl)hydantoin, add an additive based on the methionine salt solution at 150 ppm, and introduce carbon dioxide under stirring , methionine crystals were precipitated in the form of reaction crystallization, and the crude methionine crystals were obtained by filtration.
[0111](2) The above-mentioned methionine crude product is sent in the dissolving kettle, add appropriate amount of water and / or crystallization mother liquor to be mixed with the methionine suspension that solid content is 8wt%, add the solution suspension based on methionine as...
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