A method for reducing impurity content in industrial polyvinyl alcohol
A polyvinyl alcohol and impurity content technology, applied in the field of industrial polyvinyl alcohol production, can solve the problems of high cost, large weight loss of PVA products, large ethanol consumption, etc., and achieve the goals of reducing production costs, simple methods, and improving product quality Effect
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Embodiment 1
[0018] The present embodiment reduces impurity content in industrial polyvinyl alcohol according to the following steps:
[0019] 1) Add 50g of PVA clinker to 400mL of mixed solvent of methanol and water with a mass ratio of 1:0, and mechanically stir for 1 hour at a temperature of 25°C.
[0020] 2) After the stirring is completed, the sample in step 1) is subjected to solid-liquid separation, the liquid phase can be recovered, and the solid phase is ready for use;
[0021] 3) The sample in step 2) is dried, first at 55°C for 0.5 hours, then at 90°C for 0.5 hours, and the PVA product is obtained after drying.
Embodiment 2
[0023] 1) Add 50g of PVA clinker to 400mL of a mixed solvent of methanol and water with a mass ratio of 4:1, and mechanically stir for 1 hour at a temperature of 30°C;
[0024] 2) After the stirring is completed, the sample in step 1) is subjected to solid-liquid separation, the liquid phase can be recovered, and the solid phase is ready for use;
[0025] 3) The sample in step 2) is dried, first at 65°C for 1 hour, then at 100°C for 1 hour, and the PVA product is obtained after drying.
Embodiment 3
[0027] 1) Add 50g of PVA clinker to 400mL of a mixed solvent of methanol and water with a mass ratio of 3:2, and mechanically stir for 2 hours at a temperature of 33°C;
[0028] 2) After the stirring is completed, the sample in step 1) is subjected to solid-liquid separation, the liquid phase can be recovered, and the solid phase is ready for use;
[0029] 3) The sample in step 2) is dried, first at 60°C for 1.5 hours, then at 90°C for 0.5 hour, and the PVA product is obtained after drying.
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