Preparation method of calcium D,L-2-hydroxy-4-methylthiobutyrate having high purity and high bulk density
A technology of calcium methylthiobutyrate and methylthiobutyronitrile, which is applied to the preparation of sulfide, animal feed, animal feed, etc., and can solve the problems of nutrient destruction, low yield, and poor fluency
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Embodiment 1
[0048] The hydrocyanic acid mixed gas I from the hydrocyanic acid synthesis tower was detected, and the composition of the hydrocyanic acid mixed gas I was: 8.87% hydrocyanic acid gas, 3.88% water vapor, 1.64% ammonia gas, 1.13% hydrogen gas, nitrogen gas 76.01%, oxygen 1.48%, carbon monoxide 5.67%, carbon dioxide 1.13%, methane 0.39%.
[0049] Hydrocyanic acid mixed gas I passes through a 75% sulfuric acid tower to absorb ammonia and water vapor in the mixed gas, and the composition of the obtained hydrocyanic acid mixed gas II is: 9.35% hydrogen cyanide gas, 1.57% hydrogen gas, and 79.44% nitrogen gas %, oxygen 1.71%, carbon monoxide 5.79%, carbon dioxide 1.50%, methane 0.64%.
Embodiment 2
[0051] Pass hydrogen cyanide mixed gas II into 223.3g of 94.5% methional with a mass fraction of 223.3g, which contains 3.3g of pyridine. React under normal pressure, control the reaction temperature to 45°C, the ventilation rate to 300L / min, absorb the tail gas with sodium hydroxide, and monitor the residual amount of methionaldehyde by HPLC. When the residual amount of methionaldehyde is less than 0.5%, it is the end of the reaction, and the feeding can be stopped. A total of 270.64 g of light yellow liquid was obtained, the content of 2-hydroxy-4-methylthiobutyronitrile was 98%, and the residual hydrocyanic acid was 0.5%.
Embodiment 3
[0053] Pass hydrogen cyanide mixed gas II into 223.3g of methional with a mass fraction of 94.5%, which contains 2.2g of pyridine and 10g of water. Under 0.15MPa, the reaction temperature is controlled to be 42°C, the ventilation rate is 280L / min, the tail gas is absorbed with sodium hydroxide, and the residual amount of methional is monitored by HPLC. When the residual amount of methionaldehyde is less than 0.5%, it is the end of the reaction, and the feeding can be stopped. A total of 279.54 g of light yellow liquid was obtained, the content of 2-hydroxy-4-methylthiobutyronitrile was 98%, and the residual hydrocyanic acid was 0.07%.
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