Process for producing monopentaerythritol of high purity and...

C - Chemistry – Metallurgy – 07 – C

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C07C 31/24 (2006.01) C07C 29/38 (2006.01)

Patent

CA 2637556

The invention relates to a process for producing monopentaerythritol of high purity and monopentaerythritol produced by the process. Formaldehyde is reacted with acetaldehyde in an aqueous solution in the presence of a strongly basic hydroxide in a conventional way. The obtained reaction mixture is evaporated to a dryness of 50-70 % by weight and is thereafter cooled. Crystals of pentaerythritol thereby formed are separated off. The crystals are dissolved in water or in a water-containing mother liquor containing pentaerythritol to a dryness of 35-55 % by weight. The solution is treated in a purification step whereupon monopentaerythritol of high purity is crystallized at a temperature of 40-90 ~C and separated from the remaining mother liquor which is recirculated to the above mentioned step.

L'invention concerne un procédé de fabrication de monopentaérythritol de grande pureté et un monopentaérythritol obtenu par ce procédé. Du formaldéhyde est mis en réaction avec de l'acétaldéhyde dans une solution aqueuse en présence d'un hydroxyde fortement basique de manière classique. Le mélange réactionnel obtenu est évaporé à 50 à 70 % en poids, puis refroidi. Les cristaux de pentaérythritol ainsi formés sont séparés. Les cristaux sont dissous dans de l'eau ou dans une liqueur mère contenant de l'eau contenant du pentaérythritol à une sécheresse de 35 à 55 % en poids. La solution est traitée lors d'une étape de purification lors de laquelle du monopentaérythritol de grande pureté est cristallisé à une température de 40 à 900 °C et séparé de la liqueur mère restante qui est recirculée vers l'étape susmentionnée.

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