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One-step method for preparing dihydroxy acetone by dioxygen catalytic oxidation of glycerol

A technology of dihydroxyacetone and glycerin, which is applied in the field of one-step preparation of dihydroxyacetone from glycerol through molecular oxygen catalytic oxidation, can solve the problems of harsh living conditions, inability to realize localization, and no research report, etc., and achieves small environmental impact and easy The effect of low promotion and production costs

Inactive Publication Date: 2008-10-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, due to the high-concentration accumulation of substrates and products around the bacterial cells, the fermentation period is long (300-400 hours) and the yield is low; at the same time, this special cultured strain has harsh requirements for living conditions, and it is difficult to carry out long-distance transportation and storage. It is easy to lose activity during the process, and it is expensive, so it has not been able to achieve localization so far
[0005] In 1993, Japanese scholar Hiroshi Kimura used carbon-supported platinum metal and platinum-bismuth bimetallic composite catalysts for the first time to study the catalytic oxidation reaction of glycerin. During the experiment, it was found that dihydroxyacetone was generated (Applied Catalysis A: General. (1993) 217-228 ); but so far no follow-up studies have reported

Method used

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  • One-step method for preparing dihydroxy acetone by dioxygen catalytic oxidation of glycerol

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Example 1. Disperse 5g of activated carbon in 75ml of water, then slowly add a certain concentration of chloroplatinic acid solution dropwise to the above suspension, control the metal load to 5wt%, and stir and impregnate at 50°C for 3.5h , and then under the condition of 50° C., add a certain amount of formaldehyde, control the molar ratio of formaldehyde and metal to about 15:1, and control the pH of the solution during the reduction process at about 8, and stir for 1 hour. It was then filtered, washed several times with deionized water, and dried under vacuum at 60 °C to obtain a 5% Pt / C catalyst.

[0025] Add 0.5 g of Pt / C catalyst into a 100 ml three-necked flask, accurately weigh 5.0 g of glycerol, dilute it with deionized water and transfer it into a three-necked flask, the total volume of the reaction solution is about 50 ml. The temperature of the water bath was raised to 60° C., and oxygen gas was introduced under magnetic stirring for bubbling, and the flow ...

Embodiment 2

[0026] Embodiment 2, using activated carbon as a carrier, adopting chloroplatinic acid as a precursor, controlling the load of metal Pt to be 1wt%, 3wt%, and 7wt%, respectively, the metal loading method and glycerol catalytic reaction conditions are the same as in Example 1. The results are summarized in Table 1.

Embodiment 3

[0027] Embodiment 3, using activated carbon as a carrier, using chloroauric acid as a precursor, controlling the loading of metal Au to 5 wt%, the metal loading method and glycerol catalytic reaction conditions are the same as in Example 1. The results are shown in Table 1

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Abstract

A method to prepare dihydroxyacetone in one step through dioxygen catalytic oxidation from glycerin takes glycerin and oxygen or air as materials and activated carbon loaded metal as activator to prepare dihydroxyacetone intermittently in one step through reaction for 1-30 hours under the temperature of 45-90 degrees. The conversion rate of glycerin reaches 70-96% and the yield of dihydroxyacetone comes to 30-45%. The technique provides a new method to prepare dihydroxyacetone for industrial production. Compared with the biological methods in existence, the method of the invention is low in cost, high in yield and simple in process, the products are simple and convenient to separate, and the activator is stable in performance.

Description

Technical field: [0001] The invention relates to a reaction process for preparing dihydroxyacetone by directly oxidizing glycerin with molecular oxygen under the action of a metal catalyst and a catalyst preparation method for the process. Background technique: [0002] 1,3-Dihydroxyacetone (dihydroxyacetone, referred to as DHA) is the simplest ketose, with a sweet white powder crystal, soluble in water, ethanol, acetone and ether and other organic solvents. DHA is an important biochemical raw material and synthetic reagent, which plays an important role in many industries such as fine chemical industry, food industry, cosmetic industry and water purification. For example, preservatives with DHA as the main component can be used for antiseptic preservation of fruits and vegetables, aquatic products, and meat products. Cosmetics with DHA as the main component have moisturizing and sunscreen (anti-ultraviolet) functions on human skin. [0003] At the same time, DHA derivative...

Claims

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Application Information

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IPC IPC(8): C07C49/17C07C45/39B01J29/89B01J29/40
CPCY02P20/584
Inventor 梁丹高静陈平侯昭胤郑小明
Owner ZHEJIANG UNIV
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