C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 323/06 (2006.01)
Patent
CA 2101808
Abstract The present invention provides a process for producing trioxane from an aqueous solution of formaldehyde, which is characterized by comprising the following steps (1) to (4): (1) the step of preparing an aqueous solution of formaldehyde of a high concentration; (2) the step of transferring the aqueous solution of formaldehyde of a high concentration obtained in the above step (1) into a reactor packed with a solid acid catalyst to thereby form trioxane; (3) the step of introducing the aqueous solution of formaldehyde containing the trioxane produced in the above step (2) into an extractor without causing any phase change to extract the trioxane with a water- insoluble organic solvent having a boiling point higher than that of trioxane and being free from any azeotropic composition with trioxane; and (4) the step of elevating, after the completion of the extraction of the above step (3), the formaldehyde concentration of the aqueous phase and returning the aqueous phase to the reactor of the step (2), while separating the organic solvent phase into trioxane and the organic solvent by distillation and taking trioxane out of the top of a distillation column and returning the organic solvent obtained from the bottom of the distillation column to the step (3), and which aims at saving energy throughout the whole process.
Akiyama Minoru
Fukui Yuichi
Hiragohri Motohito
Kasai Yuzo
Kashihara Osamu
Polyplastics Co. Ltd.
Smart & Biggar
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