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Method for preparing fructose

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

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 fructose

Examples

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Effect test

preparation Embodiment 1

[0043] This preparation example prepares Sn-MFI molecular sieve, and specific preparation method is:

[0044] tin tetrachloride pentahydrate (SnCl 4 .5H 2 O) Dissolve in water, add this aqueous solution to tetraethyl orthosilicate (TEOS) and stir, add tetrapropylammonium hydroxide (TPAOH, 20% aqueous solution) and water under stirring, and continue stirring for 30 minutes to obtain a chemical composition of 0.03SnO 2 : SiO 2 :0.45TPA: 35H 2 The clear liquid of O was then crystallized at 433K for 2 days, and then the obtained solid was filtered, washed with distilled water, dried at 393K for 5 hours, and then calcined at 823K for 10 hours to obtain a molecular sieve sample. Among them, the amount of TEOS is 15.31g, the amount of TPAOH is 33.67g, SnCl 4 .5H 2 The amount of O used is 0.38g, and the amount of water used is 39.64g.

preparation Embodiment 2

[0046] This preparation example references "Nemeth L, Moscoso J, Erdman N, et al.Synthesis and characterization of Sn-Beta as a selective oxidation catalyst [J]. Studies in Surface Science & Catalysis, 2004, 154 (04): 2626-2631" Method prepares Sn-Beta molecular sieve, the preparation method of the adopted Sn-Beta molecular sieve is:

[0047] tin tetrachloride pentahydrate (SnCl 4 .5H 2 O) Dissolve in water, add tetraethyl ammonium hydroxide (TEAOH) to this aqueous solution and stir with tetraethyl ammonium hydroxide (TEAOH), stir until TEOS evaporates to obtain alcohol, add hydrogen fluoride (HF) to the clarified liquid , forming a paste-like thin layer. Finally, a suspension of dealuminated nano Beta seeds (20nm) and water is added to obtain a chemical composition of 0.03SnO 2 : SiO 2 :6TEA:15H 2 O: 10HF clear liquid, then crystallized at 413K for 10 days, then filtered the obtained solid, washed with distilled water, dried at 393K for 5 hours, and then roasted at 823K ...

preparation Embodiment 3

[0049] References for this preparation example "Yang X, Wu L, Wang Z, et al. Conversion of dihydroxyacetone to methyl lactate catalyzed by highly active hierarchical Sn-USY at room temperature [J]. Catalysis Science & Technology, 2016, 6 (6): 1757- 1763" method to prepare Sn-USY molecular sieve, the preparation method of the adopted Sn-USY molecular sieve is:

[0050] H-USY molecular sieve was mixed with nitric acid, treated at 85°C for 8h, the sample was filtered and washed with deionized water, and dried at 120°C for 12h to obtain a solid sample. This solid sample was mixed with tin tetrachloride pentahydrate (SnCl 4 .5H 2 O) mixed for 1h to obtain a chemical composition of 0.03SnO 2 : 100SiO2 2 The mixed liquid was dried at 100°C for 12 hours, and finally calcined at 550°C for 3 hours to obtain a molecular sieve sample. Among them, the amount of H-USY is 2.0g, the amount of nitric acid is 50mL, the amount of SnCl 4 .5H 2 The amount of O used is 0.6 g.

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Abstract

The invention relates to a method for preparing fructose. The method comprises the following steps: allowing glucose to contact with a catalyst in a reactor in the presence of alcohol, and carrying out a reaction so as to obtain a fructose-containing product, wherein the molar ratio of the glucose to the alcohol is 1: (50-600); the reaction temperature is 30 DEG C or above and is lower than 100 DEG C; the reaction time is 1-10 hours; the catalyst contains a mixture of a titanium silicalite molecular sieve and a tin silicalite molecular sieve; and the weight ratio of the glucose to the mixtureof the titanium silicalite molecular sieve and the tin silicalite molecular sieve in terms of a dry basis weight is 1: (0.1-6). The method provided by the invention has high glucose conversion rate and fructose yield.

Description

technical field [0001] The present invention relates to a method for preparing 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 advantages ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H3/02C07H1/00
CPCC07H3/02C07H1/00Y02P20/584
Inventor 夏长久刘聿嘉罗一斌彭欣欣朱斌林民舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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