Apparatus and process for purifying peach aldehyde by decompressing batch rectifying

Abstract

The present invention discloses the device and process for purifying peach aldehyde by vacuum batch distallation, which belongs to extracting and purifying technology. This device includes rectifying tower, condensator, reflux accumulator, surge drum, vacuum pump and reservoir. The rectifying towr is filled with highly efficient stuffs, which is characterized by a lining pipe calorifer with h:d ratio of 0.6-0.3. Said process comprises operating at a pressure between 133.3 Pa and 1333 Pa with a temperature range from 150 deg.C to 180 deg.C to change the relux ratio, and obtained the light components represented by octyl alcohol and peach aldehyde with eligibility purity from the top of said tower. The advantage lies in that the thickness of liguid film formed in the tower is small, therefore provides a high vaporization efficiency, a high heat transfer coefficient and short staying period of materials. Moreover, the tower is easy to handle, yet the product can reach a purity above 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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