Refined monochloroacetic acid crystalline product complexometric extraction method
A technology of crystallization of chloroacetic acid, which is applied in the field of complex extraction and purification of monochloroacetic acid crystalline products, can solve the problems of low product purity and long separation time, and achieve the effect of high selectivity and low energy consumption
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Embodiment 1
[0028] 1. Dissolve monochloroacetic acid crystals (the purity of monochloroacetic acid is about 99.0 wt%, and the purity of dichloroacetic acid is about 0.3 wt%) in deionized water to prepare an aqueous solution with a mass concentration of 120 g / L;
[0029] 2. Dissolve tri-n-octylamine and di-n-octylamine at a mass ratio of 100:1 in n-hexane to prepare an organic solution with a mass concentration of about 20 g / L;
[0030] 3. Add the organic solution prepared in step 2 to the aqueous solution prepared in step 1. The volume ratio of the organic solution to the aqueous solution is 1:1. Stir at the bottom for 0.5 h, stand and separate, the upper phase is the organic phase, and the lower phase is the water phase;
[0031] 4, in the water phase that obtains in step 3, add the normal hexane of 1 times water phase volume, at 25 Stir at the bottom for 0.5 h, let stand and separate, the upper phase is the organic phase, the lower phase is the water phase, and the water phase is tak...
Embodiment 2
[0037] 1. Dissolve monochloroacetic acid crystals (the purity of monochloroacetic acid is about 99.0 wt%, and the purity of dichloroacetic acid is about 0.3 wt%) in deionized water to prepare an aqueous solution with a mass concentration of 50 g / L;
[0038] 2. Dissolve tri-n-octylamine and di-n-octylamine with a mass ratio of 100:10 in n-hexane to prepare an organic solution with a mass concentration of about 300 g / L;
[0039] 3. Add the organic solution prepared in step 2 to the aqueous solution prepared in step 1. The volume ratio of the organic solution to the aqueous solution is 1:3. Stir at the bottom for 1 h, let stand and separate into layers, the upper phase is an organic phase, and the lower phase is an aqueous phase;
[0040] 4, in the aqueous phase that obtains in step 3, add the normal hexane of 3 times of aqueous phase volumes, at 25 Stir for 1 h at the bottom, let stand and separate, the upper phase is the organic phase, the lower phase is the water phase, and...
Embodiment 3
[0046] 1. Dissolve monochloroacetic acid crystals (the purity of monochloroacetic acid is about 99.0 wt%, and the purity of dichloroacetic acid is about 0.3 wt%) in deionized water to prepare an aqueous solution with a mass concentration of 90 g / L;
[0047] 2. Dissolve tri-n-octylamine and di-n-octylamine with a mass ratio of 100:5 in n-hexane to prepare an organic solution with a mass concentration of about 100 g / L;
[0048] 3. Add the organic solution prepared in step 2 to the aqueous solution prepared in step 1. The volume ratio of the organic solution to the aqueous solution is 1:2. Stir at the bottom for 1 h, let stand and separate into layers, the upper phase is an organic phase, and the lower phase is an aqueous phase;
[0049] 4, in the aqueous phase that obtains in step 3, add the normal hexane of 2 times of aqueous phase volumes, at 25 Stir for 1 h at the bottom, let stand and separate, the upper phase is the organic phase, the lower phase is the water phase, and th...
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