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A method of preparing xylitol by utilization of winter bamboo shoot shells

A technology of xylitol and winter bamboo shoot shells, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as unfavorable production, high content of corn cob pigment, unfavorable decolorization treatment, etc., to reduce burden, The effect of reducing the amount of decolorizing agent and simplifying the decolorizing process

Active Publication Date: 2015-07-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, corn cobs are used as raw materials, which is not conducive to the production of enterprises in southern my country, and the high pigment content of corn cobs is not conducive to decolorization treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Selection of bamboo shoot shells

[0031] Use winter bamboo shoot shells as raw materials;

[0032] (2) Hydrolysis

[0033] Clean the selected winter bamboo shoot shells with a washing machine, dry them and break them, put 100g of the broken winter bamboo shoot shells (3mm in particle size) into the hydrolysis kettle, add 300g of water, heat up to 100°C and boil for 90min, then add 500g after draining 0.5wt% sulfuric acid, then heated up to 120°C, and hydrolyzed for 3 hours under a pressure of 0.1MPa to obtain a hydrolyzate;

[0034] (3) Neutralization

[0035] The obtained hydrolyzate still contains residual sulfuric acid, and the pH value is 2.5, so CaCO 3 The emulsion is neutralized, and the specific steps are: add the hydrolyzate to the neutralization tank, raise the temperature to 75°C, and add the CaCO while stirring 3 Emulsion, adjusted to pH 3.5, in order to fully precipitate, keep warm for 60 minutes after neutralization, and then filter to remove resid...

Embodiment 2

[0048] (1) Selection of bamboo shoot shells

[0049] Use winter bamboo shoot shells as raw materials;

[0050] (2) Hydrolysis

[0051] Clean the selected winter bamboo shoot shells with a cleaning machine, dry them and break them, put 100g of the broken winter bamboo shoot shells (4mm in particle size) into the hydrolysis kettle, add 350g of water, heat up to 100°C and boil for 100min, then add 550g after draining 0.75wt% sulfuric acid, then heated up to 125°C, and hydrolyzed for 4 hours under a pressure of 0.1MPa to obtain a hydrolyzate;

[0052] (3) Neutralization

[0053] The obtained hydrolyzate still contains residual sulfuric acid, and the pH value is about 2.5, so CaCO with a Baume degree of 15 degrees is added 3 The emulsion is neutralized. The specific steps are: add the hydrolyzate to the neutralization tank, raise the temperature to 77.5°C, and add the CaCO while stirring. 3 Emulsion, adjusted to pH 3.8, in order to fully precipitate, keep warm for 70 minutes af...

Embodiment 3

[0066] (1) Selection of bamboo shoot shells

[0067] Use winter bamboo shoot shells as raw materials;

[0068] (2) Hydrolysis

[0069] Clean the selected bamboo shoot shells with a cleaning machine, dry them and crush them, put 100g of the broken winter bamboo shoot shells (5mm in particle size) into the hydrolysis kettle, add 400g of water, heat up to 100°C and boil for 120min, then add 600g after draining 1wt% sulfuric acid, then heated up to 130°C, and hydrolyzed for 5 hours under the pressure of 0.1MPa to obtain a hydrolyzate;

[0070] (3) Neutralization

[0071] The obtained hydrolyzate still contains residual sulfuric acid, and the pH value is about 2.5, so CaCO with a Baume degree of 15 degrees is added 3 The emulsion is neutralized. The specific steps are: add the hydrolyzate to the neutralization tank, raise the temperature to 80°C, and add the CaCO while stirring. 3 Emulsion, adjusted to pH 4.0, in order to fully precipitate, keep warm for 80 minutes after neutra...

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Abstract

A method of preparing xylitol by utilization of winter bamboo shoot shells is disclosed. The method includes: hydrolyzing the raw material winter bamboo shoot shells with sulfuric acid, neutralizing the obtained hydrolysate with CaCO3 emulsion to obtain a sugar solution, concentrating the sugar solution, decolorizing the sugar solution with activated carbon, purifying the sugar solution further by ion exchange, performing a hydrogenation reaction, concentrating the obtained hydrogenated sugar solution, crystallizing, separating to obtain a product that is the xylitol, and recovering the mother liquor. The method adopts the winter bamboo shoot shells as the raw material to prepare the xylitol and is simple in process, efficient and low in cost.

Description

(1) Technical field [0001] The invention relates to a preparation method of xylitol, which is a method for producing xylitol by using agricultural waste bamboo shoot shells. (2) Background technology [0002] Xylitol is a natural sweetener, the chemical name is "pentose", which is a five-carbon sugar. Similar in appearance and taste to sucrose, compared with other sugar alcohols, it is the sweetest sweetener among polyols. It has been widely used in the fields of food, medicine, printing and dyeing, textile, national defense, leather and chemical industry. In the 1970s, xylitol was approved as a class A food additive by the International Food and Agriculture and Health Organization Expert Committee on Food Additives Regulations. In June 1999, the International Codex Alimentarius Commission approved xylitol as "used in food according to normal production needs Food Additives". In recent years, as domestic and foreign scholars have studied its physiological function charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/18C07C29/136C07C29/76
Inventor 杨胜利张慧羊悦祝燕燕
Owner ZHEJIANG UNIV OF TECH
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