Process for producing pentaerythritol
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsHiromi Uehama, Kei Hioki, Akira Onuki, Kazuo Hirokawa, Takeshi Shoji
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Abstract
A process for producing pentaerythritol wherein at least part of a reaction solution which contains pentaerythritol formals is thermally treated in a pH range of 4.5-5.5 at a temperature of 120.degree.-170.degree.C. for 20-120 minutes and the resultant pentaerythritol is separated as crystals. Sodium hydroxide is added to the separated solution to cause sodium formate to crystallize, followed by separation of the crystals. The remaining solution is recirculated to the reaction system for use in the starting reaction solution.
Claims3
In a process for producing pentaerythritol wherein sodium hydroxide is added to an aqueous solution containing pentaerythritol and sodium formate to allow the sodium formate to crystallize for separation and the separated solution is recirculated for use as part of the starting reaction solution, the improvement which comprises thermally treating at least a part of the reaction solution containing pentaerythritol formals in the pH range of 4.5-5.5 at a temperature of 120.degree.-170.degree.C., for 20-120 minutes, crystallizing and separating the resultant pentaerythritol, adding sodium hydroxide to the separated solution which contains pentaerythritol and sodium formate to crystallize the sodium formate therefrom and separating the crystallized sodium formate.
Dependencies are inferred from the claim text.