Method for extracting hemicellulose from plant fiber

A technology of hemicellulose and plant fiber, applied in the field of resource utilization, can solve the problem of high cost of hemicellulose, and achieve the effects of easy cleaning, high yield and easy maintenance

Inactive Publication Date: 2014-01-29
YIBIN HIEST FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of high cost of extracting hemicellulose with ethanol, the present invention provides a method for extracting hemicellulose from plant fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method of extracting hemicellulose from plant fibers is to dissolve the plant fibers with an alkaline solution with a mass fraction of 5%, and then the lye obtained by pressing is subjected to a conventional pre-filtration method to remove large particles of impurities, and then the lye is pumped into the ceramic membrane The device performs cross-flow filtration, neutralizes the obtained concentrated solution with acid, collects the precipitated hemicellulose and dries to obtain hemicellulose; the pre-filtered lye contains 50 g / l of alkali and contains 50 g / l of hemicellulose. 40g / l.

[0024] The lye concentration that obtains concentrated solution is 3g / l, 50g / l of hemicellulose concentration.

[0025] The yield of hemicellulose was 70%.

Embodiment 2

[0027] The method of extracting hemicellulose from plant fibers is to dissolve the plant fibers with an alkaline solution with a mass fraction of 15%, and then the lye obtained by pressing is subjected to conventional pre-filtration to remove large particles of impurities, and then the lye is pumped into the ceramic membrane The device performs cross-flow filtration, neutralizes the obtained concentrated solution with acid, collects the precipitated hemicellulose and dries it to obtain hemicellulose; the pre-filtered lye contains 100g / l of alkali and contains 100g / l of hemicellulose. 60g / l.

[0028] The molecular weight cut off of the ceramic membrane is 1000.

[0029] The lye concentration that obtains concentrated solution is 6g / l, and the 60g / l of hemicellulose concentration.

[0030] The yield of hemicellulose was 80%.

[0031] The conventional pre-filtration method described in the present invention refers to conventional membrane filtration, plate and frame filtration,...

Embodiment 3

[0033] The method of extracting hemicellulose from plant fibers is to dissolve the plant fibers with an alkaline solution with a mass fraction of 10%, and then the lye obtained by pressing is subjected to conventional pre-filtration to remove large particles of impurities, and then the lye is pumped into the ceramic membrane The device performs cross-flow filtration, neutralizes the obtained concentrated solution with acid, collects the precipitated hemicellulose and dries to obtain hemicellulose; the pre-filtered lye contains 60g / l of alkali and contains 60g / l of hemicellulose. 50g / l.

[0034] The filtration area of ​​the ceramic membrane is 200M 2 , the return flow is 40M 3 / h.

[0035] The molecular weight cut-off of the ceramic membrane is 1000-5000.

[0036] The acid is added to neutralize to PH=6.

[0037] The lye concentration that obtains concentrated solution is 4g / l, and the 58g / l of hemicellulose concentration.

[0038] The yield of hemicellulose was 72%.

[0...

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PUM

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Abstract

The invention aims at solving the problem of high cost of ethanol extraction of hemicellulose and provides a method for extracting the hemicellulose from plant fiber. The method is characterized by comprising the following steps of dissolving the plant fiber in an alkaline solution with the mass fraction of 5%-15%, then removing large particle impurities in the alkaline solution obtained by squeezing by adopting a conventional pre-filtration method, further enabling the alkaline solution to enter a ceramic membrane device through a pump to perform cross-flow filtration, adding an acid into an obtained concentrated solution for neutralization, collecting the precipitated hemicellulose, and drying to obtain the hemicellulose, wherein the alkaline solution after pre-filtration contains 50-100g / l of alkali and 40-60g / l of hemicellulose. The whole process basically adopts a pure physical method to extract the hemicellulose, the purity of the obtained hemicellulose is high, and the operation cost is low.

Description

technical field [0001] The invention belongs to the field of resource utilization, and in particular relates to a method for extracting hemicellulose from plant fibers. Background technique [0002] Hemicellulose is a natural polymer that exists widely in the world. Under the circumstances of increasingly depleted energy sources and increasingly serious greenhouse effect, the development and utilization of biomass has been paid more and more attention by human beings, but there are still many difficulties. The hemicellulose This is especially true for comprehensive utilization. Due to its own shortcomings, such as easy degradation and difficult separation, its utilization value is often easily overlooked by people. [0003] The existing hemicellulose is mainly extracted from corn fiber, and the main extraction methods are water extraction and alcohol analysis. Such as 200610069003.6, the invention patent titled "A Method for Extracting Hemicellulose from Plant Fiber", which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
Inventor 邓传东李蓉玲贺敏唐孝兵莫世清
Owner YIBIN HIEST FIBER
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