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Hydrolytic treatment method for straw hemicellulose

A technology of hemicellulose and processing method, which is applied in fiber raw material processing, fiber raw material, raw material pretreatment and other directions, can solve the problems of waste of heat energy and post-concentration costs, excessive acid solution, low sugar concentration, etc., and saves manpower. And the effect of equipment, saving manpower and material resources

Active Publication Date: 2015-03-11
谷创芯生物科技(厦门)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the objectives of the present invention is to provide a method for vapor state hydrolysis of straw raw materials that have not been crushed, so as to solve the problems of low sugar concentration after hydrolysis, too much invalid acid, waste of heat energy and later concentration costs, etc. problems, and save the cumbersome process of raw material crushing
[0010] Another object of the present invention is to provide a method for hydrolysis of straw raw materials with high specific volume (pot filling density) in a pot, so as to further solve the problem of low efficiency of hydrolysis equipment

Method used

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  • Hydrolytic treatment method for straw hemicellulose
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  • Hydrolytic treatment method for straw hemicellulose

Examples

Experimental program
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Effect test

Embodiment 1

[0046] According to solid: liquid = 1:10, add 1.8% sulfuric acid to the pulverized material, hydrolyze at 121°C for 90 minutes, measure the total sugar and xylose in the hydrolyzed solution by HPLC, calculate the yield of total sugar and xylose according to the following formula, and use this Serve as a reference standard for comparison between different hydrolysis conditions.

[0047]

[0048]

[0049] Table 1 Total sugar and xylose yields of dilute acid hydrolyzates of different straw raw materials

[0050]

Embodiment 2

[0051] The method of embodiment 2 quick pickling of stalks

[0052] The main obstacle affecting the pickling speed is the air in the material. If the air inside the corncob tissue is removed, or the pressure of the pickling solution is extracted, and the acid is directly pressed into the inside of the corncob, the pickling efficiency should be accelerated. In this example, taking corn cobs with complete morphology as the object, the effects of four different pickling methods on pickling were compared and studied in a 50L hydrolysis tank. Method 1, pickling in vacuum, that is, vacuumize the hydrolysis tank full of materials to -0.9Mpa, then inject acid solution (1.5% sulfuric acid) to soak the materials, and maintain normal pressure pickling for a certain period of time. Method two, vacuum-pressure pickling. After vacuumizing the material, inject acid solution, and directly use a pump to pressurize to 0.04Mpa for pickling for a certain period of time. Method three, pickling u...

Embodiment 3

[0058] Example 3 Corn cob hydrolysis in a conventional pot

[0059] After obtaining a 50L hydrolysis tank with corncobs in a regular density pot, an applicable pickling method and basic hydrolysis conditions, a 1t hydrolysis tank was used for verification in this example.

[0060] 1t hydrolysis tank (stainless steel) single tank is filled with 116-120kg of corncobs (water content about 14%), and the conditions of the pressure swing pickling process are basically the same as those of the 50L tank. The specific process is as follows: after charging, use a pump to inject acid solution (1.3% sulfuric acid) to the overflow outlet, close the overflow valve and continue to pump the acid solution to 0.2MPa, and open the overflow valve to drain to 0.2MPa after maintaining the pressure for 15 minutes. 0MPa, pump the acid solution to 0.2MPa for the second time and maintain the pressure for 45 minutes, open the overflow valve to drain to 0MPa, and pump the acid solution to 0.2MPa for the ...

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Abstract

The invention discloses a hydrolytic treatment method for straw hemicellulose. The hydrolytic treatment method includes steps: a, compressing and squeezing raw materials to form blocks, and filling the raw material blocks into a hydrolysis tank; b, quickly pickling the raw material blocks in the hydrolysis tank until the raw material blocks are thoroughly pickled; and c, removing free acid and feeding steam into the hydrolysis tank to hydrolyze the pickled raw material blocks. By the aid of the method, high workload for crushing straw in a traditional method is omitted, and large quantities of labor and materials are saved. In addition, the raw material blocks are pickled and hydrolyzed in the hydrolysis tank, a pickling tank is omitted as compared with a traditional mode that raw materials need to be pickled in the pickling tank at first and then are fished out to be filled in a hydrolysis tank to be hydrolyzed, and huge quantities of labor and equipment are saved.

Description

technical field [0001] The invention relates to a method for hydrolyzing straw hemicellulose. Background technique [0002] Straw is the general term for the remaining stems, leaves, and ears of mature grass crops after harvesting seeds, including bagasse after sugar extraction. Its main components include lignin, cellulose, and hemicellulose. These three components The approximate proportions of straw in different crops are 30-50% cellulose, 20-35% hemicellulose, and 20-30% lignin. Among them, the cellulose hydrolyzate is glucose (six-carbon sugar), the hemicellulose hydrolyzate is mainly xylose and arabinose (both are five-carbon sugar), and the lignin degradation products are a series of complex compounds containing benzene rings. [0003] The hemicellulose part of straw is easily hydrolyzed by dilute acid to produce hemicellulose hydrolyzate mainly composed of five-carbon sugars (xylose, arabinose). After the hemicellulose dilute acid hydrolyzate is purified, the funct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21B1/02D21B1/12
Inventor 张厚瑞刘婷婷蔡爱华周玉恒卢艺芳
Owner 谷创芯生物科技(厦门)有限公司
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