Preparation method of methyl-glycine diacetate tri-sodium
A technology of methylglycine diacetic acid trisodium salt and hydroxyacetonitrile is applied in the preparation of organic compounds, chemical instruments and methods, cyanide reaction preparation, etc., and can solve the problems of large energy consumption, heavy environmental pollution and high production cost, Achieve the effect of reducing energy consumption, low content of toxic by-products, and reducing equipment investment
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Embodiment 1
[0027] A preparation method of trisodium methylglycine diacetate, which comprises the following steps successively:
[0028] First put 1622g (37%, mass percentage concentration, the same below) formaldehyde solution into a reactor with a reflux condenser, adjust the pH value to 7.5, and then pass hydrocyanic acid into the reactor at 25°C 6800g (8%) crude hydrocyanic acid gas from the synthesis tower, keep the reactor temperature at 25°C and pH value of 7.5 during the process, and obtain 2280g of hydroxyacetonitrile solution. This hydroxyacetonitrile solution was preheated to 75°C, and 170g of ammonia gas was heated to 60°C at the same time, and then the two were mixed rapidly and passed through a tubular reactor within 2.0 minutes at a reaction temperature of 90°C to obtain iminodi Acetonitrile solution 2355g (39.1%); adjust pH = 2.0 with sulfuric acid, pass 3300g (8%) crude hydrogen cyanide gas from hydrogen cyanide synthesis tower under the condition of keeping the system te...
Embodiment 2
[0030] A preparation method of trisodium methylglycine diacetate, which comprises the following steps successively:
[0031]First put 3500g (37%, mass percentage concentration, the same below) formaldehyde solution into a reactor with a reflux condenser, adjust the pH value to 6.0, and then pass hydrocyanic acid into the reactor at 30°C 11900g (9.8%) of crude hydrocyanic acid gas from the synthesis tower, in the process, 4780g of hydroxyacetonitrile solution was obtained. This hydroxyacetonitrile solution is preheated to 80°C, and 367g of ammonia gas is heated to 70°C simultaneously, and then the two are mixed rapidly and passed through a tubular reactor within 3.0 minutes, the reaction temperature is 80°C, and the iminobis Acetonitrile solution 5330g (37.2%); adjust pH = 3.0 with sulfuric acid, and pass 5950g (9.8%) crude hydrogen cyanide gas from hydrogen cyanide synthesis tower under the condition of keeping the system temperature at 25 ° C, while 970g (98% ) Acetaldehyde ...
Embodiment 3
[0033] A preparation method of trisodium methylglycine diacetate, which comprises the following steps successively:
[0034] First put 2192g (36.5%, mass percentage concentration, the same below) formaldehyde solution into a reactor with a reflux condenser, adjust the pH value to 7.0, and then pass hydrocyanic acid into the reactor at 0°C 14600g (5%) crude hydrocyanic acid gas from the synthesis tower, in the process, 2943g of hydroxyacetonitrile solution was obtained. This hydroxyacetonitrile solution was preheated to 40°C, and 227g of ammonia gas was heated to 40°C at the same time, then the two were mixed rapidly and passed through a tubular reactor within 1.0 minute, and the reaction temperature was 100°C to obtain iminodi Acetonitrile solution 3305g (36.1%); Regulate pH=1.5 with sulfuric acid, keep the system temperature at 10 ℃ and pass into 7000g (5%) crude hydrogen cyanide gas from hydrogen cyanide synthesis tower, simultaneously 580g (98% ) acetaldehyde was added dro...
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