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Method for separating and reclaiming acrolein

A technology of acrolein and hydroxypropionaldehyde, applied in the separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problems of high operating cost of thin-film evaporator condenser, difficulties in acrolein polymerization and recovery, and low recovery rate of acrolein , to achieve the effects of easy realization, lower operating temperature, and lower raw material consumption quota

Active Publication Date: 2008-03-26
SHANGHAI HUAYI NEW MATERIAL
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Problems solved by technology

In U.S. Patents US3518310, US5015789, US5093537, and US6140543, it is mentioned that thin-film evaporators are used to separate acrolein in the acrolein hydration solution, so as to shorten the contact time between the hydration solution and the heat source as much as possible, thereby avoiding the polymerization and side reactions of acrolein Although the recovery rate of acrolein has increased, the investment in thin film evaporator equipment and the operating cost of the condenser are relatively large, and the operation is also relatively difficult.
In Chinese patent CN1176057, it is mentioned that acrolein is separated and recovered by adopting vacuum rectification condensation and introducing inert gas in the dealdehyde process, although this method can effectively reduce the operating temperature of the rectification tower and reduce the generation of by-products , but in the process of acrolein condensation recovery, it is easy to cause polymerization and recovery difficulties of acrolein, resulting in operational difficulties and a decrease in the recovery rate of acrolein

Method used

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  • Method for separating and reclaiming acrolein

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Embodiment 1

[0011] In this embodiment, the acrolein hydration liquid containing 4.5% (mass) of acrolein is continuously poured into the top of the dealdehyde tower [2] with the feed pump [1], and the tower kettle of the dealdehyde tower [2] is preheated to 52 ℃, and the metered inert gas is introduced into the bottom of the dealdehyde tower [2], the gas-liquid ratio is 150-180: l, the number of trays of the de-aldehyde tower is 8-12, and it is operated under normal pressure. The acrolein content of the final 3-hydroxypropanal aqueous solution dropped from the original 4.5% by mass to 0.3% by mass, and it entered the dealdehyde solution storage tank [5] as a raw material for hydrogenation of 3-hydroxypropanal. The acrolein extracted through the gas enters the bottom of the acrolein absorption tower [3] from the top of the dealdehyde tower [2] along with the inert gas, and the top of the absorption tower [3] is sprayed with absorbed water cooled to 5°C after metering, absorbing The ratio of...

Embodiment 2

[0013] The difference between this example and Example 1 is that the acrolein hydration liquid containing 5.5% (mass) of acrolein is continuously poured into the top of the dealdehyde tower [2] with the feed pump [1], and the dealdehyde tower [2] The tower kettle is preheated to 56° C., the number of trays of the dealdehyde tower [2] is 10 to 14, the gas-liquid ratio of the inert gas fed into the tower kettle and the feed is 200 to 220:1, operated under normal pressure, and the The acrolein content of the 3-hydroxypropionaldehyde aqueous solution after the aldehyde has dropped from the original 5.5 mass % to 0.5 mass %, and it enters the dealdehyde solution storage tank [5] as a raw material for the hydrogenation of 3-hydroxypropionaldehyde. The acrolein extracted through the gas enters the bottom of the acrolein absorption tower [3] from the top of the dealdehyde tower [2] along with the inert gas, and the top of the absorption tower [3] is sprayed with absorbed water cooled t...

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Abstract

The provided separate and recovery method for non-reacted acrolein in preparation process of 3-hydroxypropionaldehyde comprises: leading gas into the tower bottom for gas stripping the acrolein from reaction product and absorb it in absorption tower with water. This invention has high recovery and prepares the material with the absorbed liquid for acrolein hydration reaction.

Description

technical field [0001] The present invention relates to a method for separating and recovering unreacted acrolein from the reaction product system of acrolein hydration to prepare 3-hydroxypropanal. Background technique [0002] The hydration reaction of acrolein is carried out under the action of acid catalysis. Since acrolein and the product 3-hydroxypropanal are relatively active substances, when the reaction is complete, it will inevitably lead to side effects in the acrolein hydration solution. The product increases and the selectivity decreases. At the same time, since acrolein has a relatively low boiling point, it is easy to separate from the product and water for recycling, so the conversion rate of acrolein is generally controlled at about 50% during the hydration reaction of acrolein to obtain higher product selectivity. However, if the unreacted acrolein in the hydration reaction process is not separated and recovered, the activity of the subsequent hydrogenatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/78C07C47/22
Inventor 张春雷宁春利周柳茵赵小歧邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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