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Method for preparing xylitol from orange peel

A technology of xylitol and citrus peels, which is applied in the field of xylitol preparation, can solve the problems of underutilization of citrus peels, single citrus products, and short industrial chain, and achieve shortened catalytic time, simple decolorization process, The effect of dosage reduction

Pending Publication Date: 2020-06-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research on citrus has the problems of a single product and a short industrial chain, and the citrus pomace, which accounts for more than 30% of the total citrus, has not been fully utilized, resulting in a great waste of resources and serious pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of method utilizing citrus peel to prepare xylitol, selects citrus peel as raw material, and described method comprises the following steps:

[0028] (1) Hydrolysis

[0029] Clean the selected citrus peels with a cleaning machine, dry them and crush them, put 100g of the crushed citrus peels (with a particle size of 2mm) into the hydrolysis kettle, add 300g of water, heat up to 100°C and boil for 90min, then add 500g after draining 0.6wt% sulfuric acid, then heated up to 121°C, and hydrolyzed for 3 hours under a pressure of 0.12MPa to obtain a hydrolyzate;

[0030] (2) Neutralization

[0031] 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, 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 precipit...

Embodiment 2

[0043] A kind of method utilizing citrus peel to prepare xylitol, selects citrus peel as raw material, and described method comprises the following steps:

[0044] (1) Hydrolysis

[0045] Clean the selected citrus peels with a washing machine, dry them and crush them. Put 100g of the crushed citrus peels (with a particle size of 4mm) into the hydrolysis kettle, add 400g of water, heat up to 100°C and boil for 100min, then add 550g after draining 0.80wt% sulfuric acid, then heated up to 125°C, and hydrolyzed for 4 hours under a pressure of 0.1MPa to obtain a hydrolyzate;

[0046] (2) Neutralization

[0047] The obtained hydrolyzate still contains residual sulfuric acid, and the pH value is about 2.5, so CaCO with a Baume degree of 16 degrees is added 3 The emulsion is neutralized. The specific steps are: add the hydrolyzate to the neutralization tank, raise the temperature to 78°C, and add the CaCO while stirring. 3 Emulsion, adjusted to pH 3.8, in order to fully precipitate...

Embodiment 3

[0059] A kind of method utilizing citrus peel to prepare xylitol, selects citrus peel as raw material, and described method comprises the following steps:

[0060] (1) Hydrolysis

[0061] Clean the selected citrus peels with a cleaning machine, dry them and crush them, put 100g of the crushed citrus peels (with a particle size of 5mm) into the hydrolysis kettle, add 500g 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 0.15MPa to obtain a hydrolyzate;

[0062] (2) Neutralization

[0063] 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 precipitat...

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Abstract

The invention discloses a method for preparing xylitol from orange peel. The method comprises the following steps: (1) hydrolyzing, (2) neutralizing, (3) decoloring, (4) ion exchange, (5) hydrogenation, and (6) concentrating, crystallizing and separating. The method provided by the invention has the advantages of novel raw materials, mild reaction conditions, low production cost and less equipmentinvestment, and is easy to realize industrialization.

Description

technical field [0001] The invention relates to a preparation method of xylitol, a method for producing xylitol by using agricultural waste citrus peel. Background technique [0002] Citrus belongs to Rutaceae Citrus subfamily. It is a pillar industry in rural Zhejiang, and the income of citrus in the main production areas has become an important source of farmers' income. As a traditional fruit in Zhejiang, citrus has a planting area of ​​about 120,000 hectares. The province’s citrus output exceeds 2 million tons, accounting for 20% of the total domestic citrus and 10% of the world’s total. % of canned orange petals come from Zhejiang. Over the years, the output of citrus in Zhejiang Province ranks among the top three in the country, and the yield per unit area ranks first in the country. With the surge of national citrus production, citrus is gradually in a state of oversupply, and the citrus industry in Zhejiang is facing huge challenges. The current research on citrus...

Claims

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Application Information

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IPC IPC(8): C07C29/136C07C29/76C07C31/18
CPCC07C29/136C07C29/76C07C31/18
Inventor 杨胜利王逸峰张慧陈萍陈雪松孔潇慧季小康
Owner ZHEJIANG UNIV OF TECH
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