Apparatus and process for purifying peach aldehyde by decompressing batch rectifying

Abstract

The invention discloses a device and process for purifying peach aldehyde by intermittent rectification under reduced pressure, which belongs to the separation and purification technology for synthesizing peach aldehyde. The device consists of a rectification tower, a condenser, a reflux tank, a surge tank, a vacuum pump, and a storage tank. The tower is equipped with high-efficiency packing. It is characterized in that the still of the rectification tower is a jacket column with a height-to-diameter ratio of 0.6 to 0.3. tube heater. The device is used to carry out the process of purifying peach aldehyde by intermittent distillation under reduced pressure. The pressure at the top of the tower is 133.3Pa ~ 1333Pa, and the temperature of the bottom of the tower is 150 ~ 180°C. Peach aldehyde with light components and qualified purity. The invention has the advantages that the tower kettle has the characteristics of small liquid film thickness, high evaporation efficiency, large heat transfer coefficient and short material residence time, the operation process of the tower is simple, and the product purity can reach more than 99 wt%.

Description

technical field [0001] The invention relates to a device and process for purifying peach aldehyde by intermittent rectification under reduced pressure, which belongs to the separation and purification technology for synthesizing peach aldehyde. Background technique [0002] Peach aldehyde is an aromatic substance with a slight peach fragrance. It can be widely used as a flavor raw material in various milky and fruity food flavor formulas, and can also be used in daily cosmetics; the patent US6737396 introduces Application of peach aldehyde in fragrance setting agent; Patent US5814325, CN1465244 has also reported the application of peach aldehyde in the production of insecticide and rodenticide. The chemical name of peach aldehyde is α-heptyl-γ-butyrolactone, which is mostly obtained by synthetic methods. Patent US5665696 reports that peach aldehyde can be prepared by addition reaction of tetrahydrofuran. At present, the method for separating and purifying peach aldehyde is ...

AI Technical Summary

Problems solved by technology

At present, the method of separating and purifying peach aldehyde is to adopt the conventional batch rectification method, which is simple and easy to operate and requires less investment; but the normal pressure boiling point of peach aldehyde is 297.0°C, which is relatively high and has certain heat sensitivity, so it is easy to adopt conventional rectification methods damage it to a certain extent

Because peach aldehyde is an intermediate component in the synthetic crude product, its light and heavy impurities need to be removed from the crude product respectively. The current method for rectifying and purifying peach aldehyde can only reach 97% by weight

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