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
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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%.
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