Method for separating mono-pentaerythritol from dipentaerythritol

• Main Authors: MA HANG, WAN BANGLONG, HUA TIAN
• Format: Patent
• Language: Chinese; English
• Published: 24.03.2023
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The invention discloses a method for separating mono-pentaerythritol from dipentaerythritol, and relates to the technical field of chemical production. The method comprises the following steps: stirring and dissolving crude pentaerythritol with desalted water at 60-80 DEG C for 10-15 minutes, filtering, separating, washing and taking a filter cake; stirring and dissolving the filter cake with desalted water at 60-80 DEG C, filtering, separating, washing and taking the filter cake; and drying the filter cake to obtain a dipentaerythritol product. The dipentaerythritol product is obtained by dissolving mono-pentaerythritol and dipentaerythritol at a certain temperature for a certain time by utilizing the characteristic that mono-pentaerythritol and dipentaerythritol have different solubility in desalted water at different temperatures, then filtering, separating and washing, dissolving again, and filtering, separating and washing, and the method is high in efficiency, low in cost and simple and rapid to operate