Method for purifying crude sodium formate byproduct from neopentyl glycol production

The invention discloses a method for purifying a crude sodium formate byproduct from neopentyl glycol production. The method comprises the following steps: (1) dissolving secondarily-distilled residue from neopentyl glycol production in water to obtain a crude sodium formate solution; (2) adding calcium formate, and precipitating to remove oxalate and carbonate in the solution; (3) adding dicyandiamide formaldehyde decolorizing flocculant and polyacrylamide flocculant, stirring, standing for a certain time, and filtering or centrifuging; (4) evaporating the filtrate under reduced pressure, crystallizing, and centrifuging to obtain a high-purity sodium formate product. The method has the technical advantages as follows: (1) the low is cost, and the process is simple and easy to implement; (2) the purity of the sodium formate product is high and can reach more than 97%.