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Method for preparing levulose by catalyzing glucose

A technology for glucose and fructose, applied in the preparation of sugar derivatives, chemical instruments and methods, monosaccharides, etc., can solve the problems of low percentage of crystalline fructose, long process flow, etc., and achieve high fructose yield and process safety. Efficient, high glucose conversion effect

Active Publication Date: 2020-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is long, and the percentage of crystalline fructose obtained in the end is small

Method used

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  • Method for preparing levulose by catalyzing glucose

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Embodiment approach

[0050] According to the first embodiment, preferably the tin-titanium-silicon molecular sieve is at 460 cm in the FT-IR spectrum -1 、975cm -1 、800cm -1 and 1080cm -1 There is absorption nearby. Preferably, the tin-titanium-silicon molecular sieve has absorption at 200-300 nm in the UV-Vis spectrum, preferably at 200-260 nm.

[0051] According to the first embodiment, preferably the molar ratio of the tin element to the silicon element in the tin-titanium-silicon molecular sieve is 0.05-10:100, more preferably 0.1-5:100, particularly preferably 0.2-2:100. Preferably, the molar ratio of titanium element to silicon element in the tin-titanium-silicon molecular sieve is 0.05-10:100, more preferably 0.1-5:100, particularly preferably 0.5-4:100. Such proportions of tin, titanium and silicon can further optimize the catalytic activity of the tin-titanium-silicon molecular sieve of the present invention.

[0052] According to the first embodiment, it is preferred that the tin-tit...

preparation Embodiment 1

[0097] In this preparation example, a Sn-Ti-MFI-1 molecular sieve is prepared according to the method of Example 1 of the Chinese patent CN 105217645A specification, and the specific preparation method is as follows:

[0098] (1) At 25°C, stirring and contacting tetrapropylammonium hydroxide aqueous solution (concentration: 15% by weight) with tetrabutyl titanate and tin tetrachloride pentahydrate for 30 minutes to obtain a mixture;

[0099] (2) At 60°C, add silicon molecular sieve S-1 to the above mixture and stir for 0.5h to obtain the mixture (during this contact process, add water or not add water as required, if the feeding in step (1) can meet the requirement of water Feeding requirements, there is no need to add water, if it is not met, you can add water when the mixture containing tetrapropylammonium hydroxide, tetrabutyl titanate and tin chloride is stirred and contacted with silicon molecular sieve, or distill off water, and the rest The preparation examples are simi...

preparation Embodiment 2

[0103] This preparation example prepares the Sn-Ti-MFI-2 molecular sieve according to the method of the Chinese patent CN105217645A specification example 2, and the specific preparation method is as follows:

[0104] (1) At 25°C, stirring and contacting tetrapropylammonium hydroxide aqueous solution (concentration: 20% by weight) with tetrabutyl titanate and tin tetrachloride pentahydrate for 30 minutes to obtain a mixture;

[0105] (2) At 25°C, add silicon molecular sieve S-1 to the above mixture and stir for 0.5h to obtain the mixture; wherein, ensure that the molar ratio of each substance is: silicon source (silicon molecular sieve): alkali source template (four Propyl ammonium hydroxide): titanium source (tetrabutyl titanate): tin source (tin tetrachloride): water=100:15:2:0.1:200, wherein the silicon source is SiO 2 In terms of titanium source as TiO 2 Tin source is calculated as tin element;

[0106] (3) Transfer the above mixture into a sealed stainless steel reaction...

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Abstract

The invention relates to a method for preparing levulose by catalyzing glucose. The method comprises the following steps of enabling the glucose to be in contact with a catalyst in a reactor in the presence of alcohol, and performing a reaction to obtain products containing the levulose, wherein the molar ratio of glucose to alcohol is 1 to (50-600), the reaction temperature is 30 DEG C or above and lower than 100 DEG C, and the reaction time is 1-10h. The catalyst contains a tin titanium silicon molecular sieve, wherein the weight ratio of the glucose to the tin titanium silicon molecular sieve in the weight ratio based on dry basis is 1 to (1-6). The method has the advantages of being high in glucose conversion rate and high in yield of levulose.

Description

technical field [0001] The invention relates to a method for catalyzing glucose to prepare fructose. Background technique [0002] Containing 6 carbon atoms in fructose, it is a kind of monosaccharide, which is an isomer of glucose. It exists in a large amount in fruit juice and honey in a free state. Fructose can also combine with glucose to form sucrose. Pure fructose is a colorless crystal with a melting point of 103-105°C. It is not easy to crystallize and is usually a viscous liquid that is easily soluble in water, ethanol and ether. Fructose has a melting point of 100-110°C, a boiling point of 401.1°C at 760mmHg, and a density of 1.758g / cm 3 , Lightning 196.4°C. Fructose is the sweetest simple sugar, but it is not easy to cause hyperglycemia, fat accumulation and obesity. The sweetness of fructose is 1.8 times that of sucrose. Under the same sweetness standard, the intake of fructose is only half of sucrose. Because fructose products have incomparable performance ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H1/00
CPCC07H3/02C07H1/00
Inventor 刘聿嘉王亚敏夏长久杨永佳彭欣欣朱斌林民罗一斌舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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