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Method for preparing deoxyfructosazine through chitin biomass

A technology of deoxyfructozine and chitin, which is applied in the field of preparing high value-added nitrogen-containing heterocyclic compound deoxyfructozine, can solve the problems of complex steps, long reaction time, low yield, etc. The effect of stabilizing the temperature range and improving the reaction selectivity

Active Publication Date: 2016-02-03
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned reaction steps are complex, the reaction time is too long, the yield is not high, the reaction needs to add a nitrogen source and the selectivity of the target product is poor (Chem.Pharm.Bull., 1991,39,792-794. Chem. )
Invention patent "A method for preparing nitrogen-containing heterocyclic compounds using chitin-based biomass resources", in which deoxyfructozine cannot be selectively prepared, and a large amount of fructozine is produced at the same time, the product separation is difficult, and the amount of ionic liquid catalyst is large, and The steps of crystallization to obtain products are complicated

Method used

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  • Method for preparing deoxyfructosazine through chitin biomass
  • Method for preparing deoxyfructosazine through chitin biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) First prepare 1-ethyl-3-methyl-imidazolium acetate ionic liquid, add 0.1mol 1-ethyl-3-methylimidazolium bromide (19.1g) and 2.5mol Potassium acetate (245.3g), was dissolved by adding 160ml of isopropanol, and stirred at room temperature for 36h. Filter, remove insoluble matter, and spin evaporate the filtrate at 70°C for 8 hours to obtain a light yellow oil, dissolve it in 80ml of dichloromethane, add activated carbon powder and stir at room temperature for 17 hours, filter, wash with carbon chloride for 3 times, and combine the filtrates and spin evaporate The solvent was removed to obtain a tan oil, which was dried under vacuum at 70°C to obtain the target product. Take 10 g of 1-ethyl-3-methyl-imidazole acetate ionic liquid, add 10 g of D-glucosamine hydrochloride with a molecular weight of 215.5, add boric acid equimolar to D-glucosamine hydrochloride, add After mixing evenly in methyl sulfoxide, react at 25°C for 48 hours.

[0033] (2) After the reaction, at ...

Embodiment 2

[0035] (1) Prepare ionic liquid as in the method in Example 1, get 25g of 1-ethyl-3-methyl-imidazole acetate ionic liquid, add 50g molecular weight and be the D-glucosamine sulfate sodium salt of 282.2, add and raw material D-Glucosamine Sulfate Sodium Salt Equimolar sodium tetraborate was uniformly mixed in 100 ml of dimethyl sulfoxide, and reacted at 80° C. for 10 minutes.

[0036] (2) After the reaction, at room temperature, take 25 ml of the reaction product solution, add 50 ml of acetonitrile, extract five times, remove insoluble impurities, concentrate by rotary evaporation, and stand for crystallization to obtain the product deoxyfructozine. The extraction agent is recovered, and the imidazole ionic liquid is recovered and reused. The conversion rate of the reaction raw material D-glucosamine sulfate sodium salt is 100%, the purity of the crystallized product is more than 98%, and the molar yield of deoxyfructosine is 55%.

Embodiment 3

[0038] (1) The preparation method of ionic liquid is similar to the preparation method of 1-ethyl-3-methyl-imidazolium acetate ionic liquid, adds 1-butyl-3-methylimidazolium bromide and Potassium acetate reaction, the molar ratio of reactants and the reaction conditions are the same as in Example 1, and 1-butyl-3-methyl-imidazole acetate ionic liquid is prepared. Get 40g of 1-butyl-3-methyl-imidazole acetate ionic liquid, add 35g molecular weight and be 250,000 chitins, add the glacial acetic acid that molar weight is 250,000 chitins of raw material molecular weight, in 100ml Mix evenly in dimethyl sulfoxide, and react at 150°C for 6 hours.

[0039] (2) After the reaction, at room temperature, take 3 ml of the reaction product solution, add 15 ml of acetonitrile, extract twice to remove insoluble impurities, concentrate the filtrate by rotary evaporation, leave it for 15 hours, and crystallize to obtain the product. The conversion rate of the chitin with a molecular weight of...

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Abstract

A method for preparing deoxyfructosazine through chitin biomass comprises the following steps: uniformly mixing a dry chitin biomass raw material, an imidazole ionic liquid solution and an additive in a dimethyl sulfoxide reaction medium for reaction to obtain an intermediate product; adding a crystal solvent in the intermediate product to completely dissolve the product, performing hot filtration to remove insoluble impurities, performing rotary evaporation concentration on a filtrate, and performing recrystallization to obtain the product, namely the deoxyfructosazine. The method has the advantages that the raw material source is wide, pollution is avoided, the preparation is simple, and the product purity is high.

Description

technical field [0001] The invention relates to a method for preparing high value-added nitrogen-containing heterocyclic compound deoxyfructosazine by using chitin biomass. technical background [0002] Using renewable biomass resources as raw materials for biorefining to obtain fuels and chemicals can reduce the over-reliance of human society on petrochemical resources and alleviate the current increasingly serious global environmental problems. Chitin and its partially or fully deacetylated derivative chitosan is an important marine biomass resource in nature, mainly found in the bones and shells of aquatic crustaceans, and also found in the cell walls of fungi and algae. The synthesized chitin is about 10 billion tons, which is the second largest biomass resource after cellulose, and also the largest amount of nitrogen-containing natural organic matter in nature except protein, and the only alkaline amino polysaccharide (GreenChem ., 2014, 16, 2204-2212. Green Chemistry,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D241/12C11B9/00A61P35/00
CPCC07D241/12C11B9/0092
Inventor 王英雄贾玲玉侯相林乔岩秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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