Method for preparing 1,3-dihydroxyacetone through formaldehyde condensation reaction catalyzed by ionic liquid
A technology of dihydroxyacetone and ionic liquid, which is used in the preparation of carbonyl compounds by condensation, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve the problems of complicated separation process, expensive catalyst and high separation cost, and achieves simple and easy reaction process. Operation and controllability
Inactive Publication Date: 2017-11-28
苏州双湖化工技术有限公司
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Problems solved by technology
This method usually uses noble metal catalyst systems such as palladium and platinum, which has the disadvantages of expensive catalyst, low product yield, complicated separation process and high separation cost.
Method used
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Embodiment 1
[0039] Add 4.5g of paraformaldehyde, 1.7g of ionic liquid 1, 0.8g of triethylamine, 60mL of ethanol in a 100mL reaction kettle, stir mechanically, and heat up to 90°C within 30min. o C, reacted for 3h under the condition of nitrogen protection. Cool after the reaction, remove the catalyst by filtration, analyze the reaction solution by gas chromatography, and quantify with the external standard method. The yield of dihydroxyacetone is 41.7%.
Embodiment 2
[0041] Same as Example 1, using ionic liquid 4 as the catalyst, the feeding amount is 1.8g, and the yield of dihydroxyacetone is 50.1%.
Embodiment 3
[0043] Same as Example 1, using ionic liquid 6 as the catalyst, the feeding amount is 2.04g, and the yield of dihydroxyacetone is 52.1%.
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The invention discloses a method for preparing 1,3-dihydroxyacetone through a formaldehyde condensation reaction catalyzed by an ionic liquid. The ionic liquid is taken as a catalyst, and 1,3-dihydroxyacetone is prepared from formaldehyde by condensation in a solvent under the synergistic effect of a catalyst promoter. Formaldehyde is taken as a reaction raw material and is cheap and available, reaction conditions are mild, and a reaction process is simple and easy to control.
Description
technical field [0001] The invention relates to a method for synthesizing 1,3-dihydroxyacetone through formaldehyde condensation reaction using ionic liquid as a catalyst. Background technique [0002] 1,3-Dihydroxyacetone (1,3-dihydroxyacetone, abbreviated as DHA), also known as acetol or dihydroxyacetone, is a white or off-white powder crystal with a sweet and cool taste and is easy to absorb moisture. In general, it is a crystal of dimer (1,4-Dioxane), but it becomes a monomer after being dissolved or heated, and its monomer is easily soluble in organic solvents such as water, ethanol, acetone and ether. Dihydroxyacetone is a naturally occurring water-soluble ketose, which is biodegradable and harmless to humans and the environment. In recent years, it has been widely used in pharmaceuticals, cosmetics, food additives, feed, etc. At the same time, dihydroxyacetone molecules contain It has three functional groups, active chemical properties, and widely participates in var...
Claims
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IPC IPC(8): C07C45/75C07C45/45C07C45/64C07C49/17B01J31/02
CPCB01J31/0285C07C45/45C07C45/64C07C45/75C07C49/17
Inventor 孙育成姜玉婷
Owner 苏州双湖化工技术有限公司
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