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Preparation method of allyl alcohol

A technology of allyl alcohol and allyl aldehyde, which is applied in the field of preparation of allyl alcohol, can solve the problems of three wastes discharge, and achieve the effects of less by-products, high reaction selectivity, and low cost

Active Publication Date: 2014-04-23
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The process route for synthesizing allyl alcohol by hydrolysis is relatively simple, and the corresponding alcohol can be synthesized directly through the hydrolysis of halogenated hydrocarbons; however, there are also some shortcomings in the hydrolysis method, and a large amount of accompanying product salts are inevitably generated in the process , resulting in a large amount of three-waste discharge

Method used

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  • Preparation method of allyl alcohol
  • Preparation method of allyl alcohol
  • Preparation method of allyl alcohol

Examples

Experimental program
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Effect test

Embodiment 1

[0042] With nitrogen as the carrier gas, formaldehyde, acetaldehyde, and water are vaporized and mixed in a vaporization chamber with a temperature of 120°C, and then passed into the catalyst Li 2 O-SiO 2 In the first reaction device 2, formaldehyde, acetaldehyde, water and N 2 The molar flow ratio is controlled at 1.2:1:3:10, wherein the molar flow of acetaldehyde is controlled at 1mol / h, the temperature in the first reaction device 2 is controlled at 200°C, and the reactant is controlled in the first reaction device 2. The residence time is 30s.

[0043] After the reaction, the system is a mixture of formaldehyde, acetaldehyde, allyl aldehyde, water, carrier gas and by-products. The carrier gas is separated by cooling to 40°C-80°C through the separator 3, and then rectified by the first rectification tower 4. Separation and collection of fractions with a dew point of about 51°C-54°C to obtain allyl aldehyde, while recycling solvent water and unreacted raw materials.

[00...

Embodiment 2

[0048] With nitrogen as the carrier gas, formaldehyde, acetaldehyde, and water are vaporized and mixed in a vaporization chamber with a temperature of 180°C, and then passed into the catalyst MgO-SiO 2 In the first reaction device 2, formaldehyde, acetaldehyde, water and N 2 The molar flow ratio is controlled at 2:1:5:30, wherein the molar flow of acetaldehyde is controlled at 1mol / h, the temperature in the first reaction device 2 is controlled at 250°C, and the amount of reactant in the first reaction device 2 is controlled. The dwell time is 20s.

[0049] After the reaction, the system is a mixture of formaldehyde, acetaldehyde, allyl aldehyde, water, carrier gas and by-products. The carrier gas is separated by cooling to 40°C-80°C through the separator 3, and then rectified by the first rectification tower 4. Separation and collection of fractions with a dew point of about 51°C-54°C to obtain allyl aldehyde, while recycling solvent water and unreacted raw materials.

[00...

Embodiment 3

[0054] With nitrogen as the carrier gas, formaldehyde, acetaldehyde, and water are vaporized and mixed in a vaporization chamber with a temperature of 160°C, and then passed into the catalyst ZnO-SiO 2 In the first reaction device 2, formaldehyde, acetaldehyde, water and N 2 The molar flow ratio is controlled at 4:1:6:50, wherein the molar flow of acetaldehyde is controlled at 1mol / h, the temperature in the first reaction device 2 is controlled at 270°C, and the amount of the reactant in the first reaction device 2 is controlled. The dwell time is 15s.

[0055] After the reaction, the system is a mixture of formaldehyde, acetaldehyde, allyl aldehyde, water, carrier gas and by-products. The carrier gas is separated by cooling to 40°C-80°C through the separator 3, and then rectified by the first rectification tower 4. Separation and collection of fractions with a dew point of about 51°C-54°C to obtain allyl aldehyde, while recycling solvent water and unreacted raw materials.

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Abstract

The invention provides a preparation method of allyl alcohol. The preparation method comprises the steps of reacting acetaldehyde or propaldehyde with formaldehyde under the existence of a heterogeneous catalyst to obtain allyl aldehyde, wherein the allyl aldehyde is allyl aldehyde or methyl allyl aldehyde; reacting allyl aldehyde or methyl allyl aldehyde with hydrogen gas under the existence of a catalyst to obtain the allyl alcohol, wherein the allyl alcohol is allyl alcohol or 2-methyl allyl alcohol. The method has simple process, low cost, few byproducts, good selectivity and high yield.

Description

technical field [0001] The invention belongs to the field of synthesis of unsaturated alcohols, in particular to a preparation method of allyl alcohol. Background technique [0002] The molecular structure of allyl alcohol contains two highly reactive functional groups, unsaturated double bonds and hydroxyl groups, which can participate in chemical reactions such as oxidation, reduction, etherification and addition, and are widely used in medicine, perfume and organic synthesis. With the promotion and application of ether-type high-performance polycarboxylate water reducers, the demand for unsaturated polyethers with unsaturated alcohols as initiators has increased. Allyl alcohol is an important polyether initiator , can be activated into an initiating active species under the action of a basic catalyst to initiate homopolymerization or copolymerization of alkylene oxide, thereby synthesizing unsaturated polyether products with various structures and properties to meet the n...

Claims

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Application Information

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IPC IPC(8): C07C33/03C07C29/141C07C45/75C07C47/22
CPCC07C29/141C07C45/75C07C33/03C07C47/22
Inventor 冉千平范士敏王涛杨勇吕志锋张月星刘加平
Owner JIANGSU SOBUTE NEW MATERIALS
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