1. Sodium formate and isobutyraldehyde are condensed with formaldehyde at 30-35 ° C, pH 9-11, in the presence of a base catalyst to form hydroxy-tert-butanal, and the excess formaldehyde is reduced to neopentyl glycol under strong alkali conditions, and formaldehyde is Oxidizes and reacts with a base to form sodium formate. The reaction solution is neutralized with formic acid, dehydrated under reduced pressure, and the concentrated solution is subjected to layered extraction to remove sodium formate, followed by cooling, crystallization, and separation to obtain a finished product.
2. Hydrogenation method The condensation of isobutyraldehyde and formaldehyde gives hydroxypivalaldehyde, which is obtained by hydrogenation reduction.
Main use: Neopentyl glycol is widely used as a plasticizer for the production of unsaturated polyester resins, oil-free alkyd resins, polyurethane foams and elastomers, additives for advanced lubricants and other fine chemicals. Neopentyl glycol is an excellent solvent for the selective separation of aromatic hydrocarbons and cycloalkyl hydrocarbons. Neopentyl glycol has water resistance, chemical resistance, and weather resistance. Its amino baking varnish has good gloss retention and does not yellow. It can also be used as a raw material for the production of polymerization inhibitors, stabilizers and insecticides.