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A method for preparing xylitol and mixed syrup from xylose mother liquor
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A technology of xylose mother liquor and xylitol, which is applied in the preparation of sugar derivatives, chemical instruments and methods, and xylose production, and can solve the problems of low utilization rate of xylose, no utilization of xylose, and low conversion rate of xylitol , to achieve obvious effects, reduce viscosity and increase added value
Active Publication Date: 2020-09-11
ZHEJIANG HUAKANG PHARMA +1
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[0007] Patent CN 101643752B introduces a method for producing xylitol and L-arabinose by using xylose mother liquor, converting xylose in xylose mother liquor into xylitol by yeast fermentation, and extracting L-arabinose by chromatographic separation , but due to the low conversion rate of yeast fermenting xylose into xylitol, the utilization rate of xylose in the xylose mother liquor is low
[0008] Patent CN101857523B introduces a method for simultaneously producing xylitol and arabitol by using xylose mother liquor, using yeast fermentation to remove glucose and galactose in xylose mother liquor, and then hydrogenation first to obtain mixed sugar alcohol liquid, Then chromatographically separate the xylitol fraction and the arabitol fraction, and then refine; this method glucose and galactose are removed and not utilized
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Embodiment 1
[0048] 1. Prepare 5L of xylose mother liquor: dry matter percentage concentration (sugar concentration) is about 50%, of which, the dry matter contains about 12% glucose, about 46% xylose, 18% arabinose, 18% mannose, and galactose Contains 3%.
[0049] 2. Pretreatment: add calcium hydroxide solution to the xylose mother liquor (use 50°C warm water to prepare a 50wt% calcium hydroxide solution), adjust the pH value to 9.0, and then fill it with carbon dioxide, the flow rate of carbon dioxide is 15L / min, and the pH When the value drops to 6.85, calcium hydroxide deposits colloidal substances in the process of converting to calcium carbonate, and then passes through diatomaceous earth-assisted filtration to remove the deposited colloidal substances. Then, it is treated with D001 type styrene macroporous strong acid cation exchange resin, the feed temperature is 58°C, the feed pH is 6.0, the advanced material, the feed flow rate is 0.2L / min, and the time is 25min, followed by puri...
Embodiment 2
[0062] 1. Prepare 5L of xylose mother liquor: the dry matter concentration (sugar concentration) is about 55%, of which, the dry matter contains about 14% glucose, about 48% xylose, 17% arabinose, 18% mannose, and galactose Contains 3%.
[0063]2. Pretreatment: add calcium hydroxide solution to the xylose mother liquor (use 50°C warm water to prepare a 50wt% calcium hydroxide solution), adjust the pH value to 9.0, and then fill it with carbon dioxide, the flow rate of carbon dioxide is 15L / min, and the pH The value drops to 6.95, and the calcium hydroxide deposits colloidal substances during the conversion into calcium carbonate, and then passes through diatomaceous earth-assisted filtration to remove the deposited colloidal substances. Then, it is treated with D001 type styrene macroporous strong acid cation exchange resin, the feed temperature is 60°C, the feed pH is 6.2, the advanced material, the feed flow rate is 0.25L / min, and the time is 20min, followed by purified wate...
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Abstract
The invention discloses a method for preparing xylitol and mixing syrup from xylose mother liquor. The method comprises the steps: pretreatment, specifically, a calcium hydroxide solution is added into the xylose mother liquor to adjust the pH to 8.5-9.0, carbon dioxide is introduced to adjust the pH to 6.6-7.0, and part of calcium ions are removed by cation exchange resin; chromatographic separation to obtain an extracting solution and raffinate; decolorization and filtration; hybridization and purification; evaporation, specifically, the extracting solution subjected to hybridization and purification is vacuum-concentrated till the mass percentage concentration of dry matter is 75-85%, and the raffinate is vacuum-concentrated till the mass percentage concentration of the dry matter is 65-75%, so that a finished mixing syrup product is obtained; crystallization; centrifugation and drying; dissolution and hydrogenation; and refining to obtain xylitol crystals. According to the invention, the xylose mother liquor is pretreated by calcium hydroxide and carbon dioxide; the method is simple and easy; the effect is obvious; impurities are removed; the viscosity of the xylose mother liquor is lowered; and the filtration speed is increased. All monosaccharide components of the xylose mother liquor are utilized, so that the additional value of the xylose mother liquor is increased.
Description
technical field [0001] The invention relates to the technical field of reusing xylose mother liquor, in particular to a method for preparing xylitol and mixed syrup from xylose mother liquor. Background technique [0002] As a natural five-carbon sugar alcohol, xylitol has the same sweetness and calories as sucrose, and is one of the important functional food additives. The metabolism of xylitol does not require insulin, and it can replace sucrose as a sweetener for diabetics. At the same time, xylitol is used in chewing gum as a sweetener, and also has the function of maintaining the acid-base balance of the oral cavity and preventing dental caries. [0003] At present, the production method of xylitol is mainly chemical method, that is, corn cob, bagasse and other raw materials rich in pentosan (containing 36-40% pentosan) are used, and the hydrolyzate containing xylose is obtained by acid hydrolysis. , and then through complex purification processes such as neutralizati...
Claims
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Application Information
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