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Method for preparing 3-hydroxypropionaldehyde through hydration of acrolein

A technology for hydration of acrolein and hydroxypropionaldehyde, which is applied to the preparation of carbon-based compounds, preparation of organic compounds, chemical instruments and methods, etc., and can solve the problems of unsuitable continuous operation, low production efficiency and long reaction time of tank reactors and other problems, to achieve the effect of reducing the activation energy of the reaction, high production efficiency, and increasing the probability of effective collision

Pending Publication Date: 2019-01-04
ZHEJIANG UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, the above-mentioned methods for preparing 3-hydroxypropanal by hydration of acrolein all have problems such as slow reaction rate, long reaction time, and low production efficiency, and the tank reactor is not suitable for continuous operation. Propionaldehyde is still in the stage of laboratory research

Method used

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  • Method for preparing 3-hydroxypropionaldehyde through hydration of acrolein

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 30 g of polystyrene-based chelating ion resins were packed into the fixed-bed reactor 4 to form a catalyst bed 5 . Turn on the microwave and set the power to 50 W, use the metering pump 2 to pump the acrolein aqueous solution with a mass fraction of 15% in the raw material tank 1 into the fixed bed reactor 4 from bottom to top, and the space velocity is 5 h -1 , in the acrolein aqueous solution, add the hydroquinone of 500ppm by mass as the polymerization inhibitor, the first temperature sensor 7 and the second temperature sensor 8 record the catalyst bed layer 5 feed end and the discharge end in the fixed bed reactor 4 The temperatures are 45°C and 55°C respectively (the first temperature sensor 7 and the second temperature sensor 8 both use optical fiber sensors), and the average temperature of the reaction raw materials flowing through the catalyst bed 5 is 50°C. While the temperature on the top gradually increases successively, the mass concentrati...

Embodiment 2

[0026] Embodiment 2: as attached figure 1 As shown, 30 g of polystyrene-based chelating ion resins are loaded into the fixed-bed reactor 4 to form a catalyst bed 5 . Turn on the microwave and set the power to 30W, use the metering pump 2 to pump the acrolein aqueous solution with a mass fraction of 18% in the raw material tank 1 into the fixed bed reactor 4 from bottom to top, and the space velocity is 3.8 h -1 , adding 300 ppm by mass of 2,2,6,6-tetramethyl-4-hydroxypiperidine nitroxide free radicals in the acrolein aqueous solution as a polymerization inhibitor, the first temperature sensor 7 and the second temperature sensor 8 measured The temperatures at the feed end and discharge end of the catalyst bed 5 in the fixed bed reactor 4 are 37°C and 43°C respectively (the first temperature sensor 7 and the second temperature sensor 8 both use optical fiber sensors), and the raw material flows through the catalyst bed 5 with an average temperature of 40°C.

[0027]The reactio...

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Abstract

The invention discloses a method for preparing 3-hydroxypropionaldehyde through hydration of acrolein. The method comprises the following steps: conducting the reaction in a hydration reaction device,enabling an acrolein aqueous solution to enter a fixed bed reactor, and enabling the acrolein to have a continuous catalytic hydration reaction on a catalyst bed layer of the fixed bed reactor underthe action of microwaves to obtain the 3-hydroxypropionaldehyde, wherein the hydration reaction device comprises a microwave cavity body, the fixed bed reactor and the catalyst bed layer, the fixed bed reactor is internally provided with the catalyst bed layer, the fixed bed reactor is arranged in the microwave cavity body, and the microwave cavity body is connected with a microwave generation device. The microwave heating is used to evenly heat the material rapidly, the reaction speed is accelerated, the reaction time is shortened, the production efficiency is improved, the operation of the reaction process is simple, and the device can continuously stably operate for a long term.

Description

technical field [0001] The invention relates to a method for preparing 3-hydroxypropanal by hydrating acrolein. Background technique [0002] 3-Hydroxypropionaldehyde is an intermediate product in the preparation of 1,3-propanediol from acrolein. 1,3-propanediol is a very important chemical raw material, which is widely used in cosmetics, brake fluid, thermoplastic materials and other fields, especially for the synthesis of polyester fiber with excellent performance - poly(1,3-propylene terephthalate) (PTT), PTT fiber has been widely concerned at home and abroad because of its superior properties to polyester and nylon, and its market demand is also increasing year by year. Acrolein is first hydrated to obtain 3-hydroxypropanal, which has the advantages of mild reaction conditions, low equipment requirements, low investment, and mature subsequent hydrogenation process. [0003] Chinese patents CN 1238321C, CN 100417443C, CN 1184183C and U.S. Patent US 5,015,789 use chelati...

Claims

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Application Information

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IPC IPC(8): C07C45/64C07C47/19
CPCC07C45/64C07C47/19
Inventor 聂勇王一磊解庆龙计伟荣夏凡卢美贞梁晓江于凤文计建炳
Owner ZHEJIANG UNIV OF TECH
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