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Double-tower continuous rectifying process of heliotropin

A kind of jasmine aldehyde and process technology, applied in the field of rectification, can solve the problems of low yield, frequent operation, low efficiency and the like, achieve the effect of high mass transfer efficiency and improve product quality

Inactive Publication Date: 2016-07-20
福建仁宏医药化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of batch distillation are low efficiency, long residence time of materials in the tower kettle and more oxidation, low yield, frequent operation and difficult to achieve tower balance, etc.

Method used

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  • Double-tower continuous rectifying process of heliotropin
  • Double-tower continuous rectifying process of heliotropin
  • Double-tower continuous rectifying process of heliotropin

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Embodiment Construction

[0028] Such as figure 1 and figure 2 Shown, be the two-tower continuous rectification process of a kind of jasmonal of the present invention, comprise the steps:

[0029](a) adopt piperonine and glyoxylic acid as raw material, select the reactor 1 of bar shape for use, on reactor 1, main feeding inlet 2 is arranged horizontally, on reactor 1, at least three auxiliary feeding inlets 3 are vertically arranged, The auxiliary feed ports 3 are uniformly distributed on the reactor 1 in a straight line. Glyoxylic acid is continuously fed into the reactor 1 through the main feed port 2. When the glyoxylic acid is at 1 / 5 of the total volume of the reactor 1, the piperonyl ring is divided into the first batch, the second batch, and the third batch. Batch, etc., the specific batch is determined according to the quantity of the auxiliary feed port 3, the batch of pepper rings closest to the main feed port 2 has the heaviest weight, and then the pepper ring weight decreases in turn, and...

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Abstract

The invention discloses a double-tower continuous rectifying process of heliotropin. The double-tower continuous rectifying process comprises the following steps: (a) enabling raw materials to fully react in a reactor; (b) arranging a first rectifying tower and a second rectifying tower at the top part of a reactor; (c) continuously heating the first rectifying tower and the second rectifying tower with heat-conducting oil; (d) distilling the materials; (e) extracting a light component in the material to a first product receiver, and extracting the heliotropin to a second product receiver; (f) carrying out pressure filtration on the heliotropin; and (g) packaging the heliotropin. The material feed composition and the feed quantity in the first rectifying tower are adjusted according to the material rectifying state in the first rectifying tower, so that the product quality is improved; meanwhile, the materials are continuously rectified in the first rectifying tower and the second rectifying tower, so that the required vacuum degree is easy to reach during decompression operation; and the double-tower continuous rectifying process has the beneficial effects that the rectifying efficiency is improved, the labor intensity is reduced and the uniformity and stability of the product quality are improved.

Description

technical field [0001] The invention belongs to the technical field of rectification, and in particular relates to a double-tower continuous rectification process of jasmonal. Background technique [0002] Jasmonal is also known as piperonal, heliopine, heliopine, pepper formaldehyde, oxidized piperonal, etc. Its chemical name is 3,4-methylenedioxybenzaldehyde, and its English name is: piperonal, helitropine, 3,4 -methylenedioxybenzaldehyde, whose structure is as follows: [0003] [0004] The appearance of jasmonal is white shiny crystal, with a melting point of 37°C and a boiling point of 263°C; insoluble in water and glycerin, easily soluble in ethanol, ether, benzyl benzoate, diethyl phthalate, soluble in propylene glycol, in olive oil. Jasmonal is easy to change color under heat and light, and is stable in dilute acid and dilute alkali. [0005] Jasmonal is a very important intermediate in the synthesis of fine chemicals and fragrances. It is widely used in the fo...

Claims

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Application Information

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IPC IPC(8): C07D317/54
CPCC07D317/54
Inventor 严招春
Owner 福建仁宏医药化工有限公司
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