Preparation process of neopentyl glycol and equipment used in process

The invention provides a preparation process of neopentyl glycol and equipment used in the process. A catalyst is used by adding water into a mixed weak base salt of sodium carbonate and sodium bicarbonate to prepare a buffer solution. The process comprises the following steps: firstly, adding the mixed weak base buffer solution of sodium carbonate and sodium bicarbonate into a formaldehyde aqueous solution, then adding isobutyraldehyde at a constant speed, carrying out reaction for a period of time after the isobutyraldehyde is completely added, adding liquid caustic soda dropwise, and completing dripping within 60-70min, controlling the reaction temperature at 60-70DEG C, and carrying out heat preservation reaction for a period of time; neutralizing the reacted condensation liquid to neutral, evaporating water for concentration, conducting standing for layering, refining neopentyl glycol obtained on the upper layer, extracting neopentyl glycol in the water phase on the lower layer byusing a solvent, recycli