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Method for producing xylitol by using eucalypt chip hydrolysis fluid and hydrolyzing tower

A technology of hydrolyzate and eucalyptus wood chips, which is applied in the field of hydrolysis towers, can solve the problems of low utilization value of waste residue, waste of resources and energy, and low production efficiency, and achieve the effects of improving raw material utilization, saving time, and improving efficiency

Active Publication Date: 2014-09-17
SHANDONG TAIYANGZHIYE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The seasonality of raw materials such as corncobs is obvious, requiring a lot of storage space;
[0008] 2. Corn cobs are used as raw materials to produce xylitol, and the waste residue has low utilization value;
[0010] 4. The intermittent hydrolysis process requires complex procedures such as potting, adding acid solution, hydrolysis, extraction, and unloading, and the production efficiency is low
[0011] Eucalyptus is a resource-rich renewable resource. Pulping and papermaking consumes a large amount of eucalyptus every year. In addition to the effective use of cellulose in the form of pulp, more than 20%-25% of the mass fraction of hemicellulose is Wood chip hydrolyzate and pulping black liquor are mixed into the alkali recovery system and burned. The calorific value of hemicellulose is only half of that of lignin. It is easy to scale when concentrated and burned, resulting in waste of resources and energy.

Method used

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  • Method for producing xylitol by using eucalypt chip hydrolysis fluid and hydrolyzing tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Pump the aqueous solution of eucalyptus chips into the continuous hydrolysis tower. The hydrolysis reaction time of eucalyptus chips is 2.5h, the reaction temperature is 165°C, the pressure is 0.7MPa, and the mass ratio of eucalyptus chips to water is 1:4. After continuous extraction, the conversion rate of pentose sugars reached 60.8%;

[0036] The eucalyptus chip hydrolyzate was hydrolyzed for 90 minutes under the conditions of sulfuric acid concentration 10g / l and temperature 120°C, the dry matter concentration was 5%, the inorganic acid content was 1.2%, and the xylose purity was 65%;

[0037] The hydrolyzate was decolorized for 40 minutes at a temperature of 75°C. The amount of activated carbon added was 7% of the dry matter. The decolorized solution was ion-exchanged according to the anion-yang process to obtain a primary ion-exchange solution. Light shading: 5%, light transmission 86.5%, Total acid: 0.4%;

[0038] Concentrate the primary ion exchange liquid to a...

Embodiment 2

[0048] Pump the aqueous solution of eucalyptus chips into the continuous hydrolysis tower. The hydrolysis reaction time of eucalyptus chips is 3h, the reaction temperature is 170°C, the pressure is 0.76MPa, and the mass ratio of eucalyptus chips to water is 1:4. After continuous extraction, the conversion rate of pentose sugars reached 63.3%;

[0049] The eucalyptus chip hydrolyzate was hydrolyzed for 120 minutes at a sulfuric acid concentration of 7g / l and a temperature of 120°C. The dry matter concentration was 8%, the inorganic acid content was 0.8%, and the xylose purity was 67.5%.

[0050]The hydrolyzate was decolorized for 45 minutes at a temperature of 80°C. The amount of activated carbon added was 10% of the dry matter. The decolorized solution was ion-exchanged according to the anion-yang process to obtain a primary ion-exchange liquid with 8% shading and 89% light transmission. , total acid: 0.3%;

[0051] Concentrate the primary ion exchange solution to a xylose co...

Embodiment 3

[0054] Pump the aqueous solution of wood chips into the continuous hydrolysis tower. The reaction time of wood chips hydrolysis is 4 hours, the reaction temperature is 170°C, the pressure is 0.76%, the mass ratio of wood chips to water is 1:4, and the hydrolyzate is continuously extracted in the lower part of the reaction tower. out, the pentose conversion rate reached 64.3%;

[0055] The eucalyptus hydrolyzate was hydrolyzed for 120 minutes at a sulfuric acid concentration of 8g / l and a temperature of 120°C. The dry matter concentration was 12%, the inorganic acid content was 1.0%, and the xylose purity was 69%.

[0056] The hydrolyzate was decolorized for 45 minutes at a temperature of 70°C. The amount of activated carbon added was 10% of the dry matter. The decolorized solution was ion-exchanged according to the anion-yang process to obtain a primary ion exchange liquid. , total acid: 0.4%;

[0057] Concentrate the primary ion exchange liquid to a xylose content of 55%, fu...

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Abstract

The invention relates to a production method of xylitol, in particular to a method for producing xylitol from eucalyptus dissolving pulp wood chip pre-extraction hydrolyzate, and also to a hydrolysis tower used in the hydrolysis process. A method for producing xylitol by pre-extracting hydrolyzate from eucalyptus dissolving pulp chips, comprising the steps of: pre-hydrolyzing eucalyptus chips, acid hydrolyzing the pre-hydrolyzed hydrolyzate, decolorizing the hydrolyzate, ion exchange purification, Concentration and crystallization treatment to obtain xylose, and then dissolving, hydrogenation, decolorization and purification, and crystallization treatment of xylose to obtain xylitol. It is characterized in that: the pre-hydrolysis of eucalyptus chips is carried out in a hydrolysis tower. After the pre-hydrolysis, The hydrolyzate is extracted from the hydrolysis tower, and then the hydrolyzate is subjected to acid hydrolysis. Since the method of the present invention is continuous feeding and hydrolysis, it reduces the problems of low production efficiency and low production efficiency in the intermittent hydrolysis process in the prior art, such as pot loading, acid addition, hydrolysis, extraction, and unloading. Save time and improve efficiency.

Description

technical field [0001] The invention relates to a production method of xylitol, in particular to a method for producing xylitol from eucalyptus dissolving pulp wood chip pre-extraction hydrolyzate, and also to a hydrolysis tower used in the hydrolysis process. Background technique [0002] Xylitol is an important chemical raw material and a sweet substance with nutritional value. It can be used to prepare surfactants, emulsifiers, demulsifiers, alkyd resins and coatings. It is a raw material for the manufacture of various drugs in the pharmaceutical industry. It not only has It has the characteristics suitable for human health needs, and also has good process characteristics and sensory characteristics suitable for making sugar-free candies. Especially food-grade xylitol has gradually entered people's lives with its unique advantages and has broad market prospects. [0003] At present, domestic xylitol production mainly uses corncobs as raw materials, which are decomposed in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/18C07C29/141B01J14/00
CPCC07C29/141C07C31/18
Inventor 应广东陈克复刘泽华刘延波乔军张伟翟丙彦梁洪金路庆辉钟洪霞
Owner SHANDONG TAIYANGZHIYE
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