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Preparation method of glucolactone

A technology of gluconolactone and glucose, which is applied in the field of food additive production, can solve the problems of long production cycle, high production cost and high energy consumption, and achieve the effects of reduced production cost, high yield and low energy consumption

Inactive Publication Date: 2012-03-07
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has long production cycle, high energy consumption and high production cost

Method used

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  • Preparation method of glucolactone
  • Preparation method of glucolactone
  • Preparation method of glucolactone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 100g of glucose into a 1L measuring cylinder, add deionized water to make the volume to 200ml, and obtain a glucose solution; insert a ventilation pump and a UV lamp with a power of 40W into the glucose solution in the measuring cylinder; put the measuring cylinder into the reaction device, and set the temperature At 40°C, carry out the catalytic oxidation reaction under the condition of feeding air and stirring; during the reaction process, 103 ml of hydrogen peroxide with a mass fraction of 30% was added for 0.6 hours, and after the catalytic oxidation reaction for 2 hours, filter to obtain 280 ml of gluconic acid solution. At this point, the conversion rate of glucose was measured to reach 99.1%, as figure 1 As shown, the peak at 1.801min is the target product gluconic acid, and it can be seen that the selectivity of the generated gluconic acid is better by integral conversion, reaching 90%.

[0025] Concentrate the gluconic acid solution obtained above under red...

Embodiment 2

[0027] Add 5kg of glucose into a 30L reaction pot, add deionized water to make the volume to 16L, and obtain a glucose solution; insert the ventilation pump and 8 UV lamps with a power of 40W into the glucose solution evenly; set the temperature of the reaction pot at 50 ℃, carry out the catalytic oxidation reaction under the condition of feeding air and stirring; during the reaction process, 2.58L hydrogen peroxide with a mass fraction of 30% was added for 0.6 hours, and after the catalytic oxidation reaction was carried out for 3 hours, filtered to obtain 18.6L gluconic acid solution. At this time, it was measured that the conversion rate of glucose reached 98.3%, and the selectivity of the generated gluconic acid reached 88.6%.

[0028] Concentrate the gluconic acid solution obtained above under reduced pressure at 75°C to a solid content of 80%, then add gluconolactone seed crystals with a theoretical mass content of gluconolactone of 0.3%, and crystallize in a stirring cry...

Embodiment 3

[0030] Add 40kg of glucose into a 200L reaction pot, add deionized water to 66L to obtain a glucose solution; insert a ventilation pump and 10 UV lamps with a power of 200W into the glucose solution; set the temperature of the reaction pot at 60°C , carry out the catalytic oxidation reaction under the condition of feeding air and stirring; during the reaction process, 42L mass fraction of 30% hydrogen peroxide was added for 0.3 hours, after the catalytic oxidation reaction was carried out for 1 hour, filtered to obtain 103L gluconic acid solution. At this time, it was measured that the conversion rate of glucose reached 97.5%, and the selectivity of the generated gluconic acid reached 88.2%.

[0031] Concentrate the gluconic acid solution obtained above under reduced pressure at 80°C to a solid content of 85%, then add gluconolactone seed crystals with a theoretical mass content of gluconolactone of 0.1%, and crystallize in a stirring crystallizer for 30 hours. Control the tem...

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Abstract

The invention discloses a preparation method of glucolactone. The method comprises the following steps of: dissolving glucose into deionized water to obtain a glucose solution as a raw material, illuminating the glucose solution by using an ultraviolet lamp, additionally providing an air pump in a reaction device to accelerate a mass transferring process, adding hydrogen peroxide in the reaction process, undergoing a catalytic oxidation reaction under a stirring condition at a temperature of 20-60 DEG C for 1-4h and filtering to obtain a glucose acid solution; carrying out reduced-pressure concentration on the glucose acid solution at 70-80 DEG C and concentrating to form 70-90% of crystallization solution; adding seed crystals into a concentrated solution and placing in a crystallizationstirrer for crystallization to obtain a glucolactone product. The preparation method of the glucolactone has the advantages of not only shortening the production period and not causing industrial pollution, but also reducing production cost, realizing low energy consumption and high yield and being suitable or industrial production.

Description

technical field [0001] The invention belongs to the field of food additive production, in particular to a method for directly preparing gluconolactone from glucose solution by using an ultraviolet-hydrogen peroxide method. Background technique [0002] Gluconolactone is white crystal or crystalline powder, very soluble in water, slightly soluble in ethanol, almost insoluble in ether. Slowly hydrolyzed in aqueous solution to generate gluconic acid. Gluconolactone is widely used in the process of food production and food processing, mainly used as coagulant of milk protein and soybean protein, fresh-keeping agent in meat of fish and poultry, and pigment stabilizer of meat products such as luncheon meat and sausage , It can also be used as a loosening agent for pastry bread, and it can also be a chelating agent, a sour agent, and a pH lowering agent. [0003] At present, there are three main production methods of gluconolactone: one is to directly prepare gluconolactone by en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D309/30
Inventor 欧仕益汪炯赵健周华
Owner JINAN UNIVERSITY
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