Process for synthesis of 3-hexyne- 2, 5-diol by slurry bed acidity control method

The invention discloses a process for synthesis of 3-hexyne- 2, 5-diol by slurry bed acidity control method. The process includes: adding an acetaldehyde aqueous solution and a catalyst into a slurry bed reaction kettle and conducting mixing to obtain a slurry solution, then introducing acetylene from the lower part of the slurry solution into a slurry system to carry out reaction, thus obtaining a generated solution; in the reaction process, adding an alkali solution repeatedly to control the pH value of the reaction solution at 5.5-7.0; cooling the generated solution, conducting first standing settlement layering, then conveying the generated solution from standing settlement to a high level settler to carry out second standing settlement layering, and carrying out concentration and separation on the supernatant, and subjecting the remaining concentrated liquid to vacuum distillation, thus obtaining the 3-hexyne- 2, 5-diol. In the synthesis process, the low concentration alkali solution is added to control the pH value of the reaction solution at 5.5-7.0, so that the whole reaction has high selectivity and high production rate, thus being more conducive to industrial production.