撑篙竹乙醇粗糖的脱色及其乙酸水解

doi:10.3969/j.issn.0253-2417.2023.03.015

Abstract

Abstract:

The crude sugar was extracted from the wastewater of ethanol pulping of punting bamboo. The decolorization effects of crude sugar were systematically studied by re-dissolution and resin decolorization. At the same time, the crude sugar was hydrolyzed by acid, and the effects of reaction conditions on the degradation of crude sugar were discussed. The results showed that the solubility of small molecule polysaccharide was better than that of large molecule polysaccharide during water redissolving, and the lignin was almost insoluble. Among the five decolorants, the D301R macroporous weakly alkaline anion exchange resin exhibited better results in decolorizing crude sugar solutions and preserving total sugars. The optimal conditions for dynamic decolourisation were as follows: the mass concentration of sugar solution of 8 g/L, flow rate of 4 mL/min, loading temperature of 30 ℃, and pH of 7.0. At those conditions, the retention rate of total sugars was 80%, the solution transmission rate was 92% and the removal rate of residual lignin was 90%. Acetic acid hydrolysis had a good effect on improving the degradation of macromolecular polysaccharides, and the condition of 8 mL/g acid addition, 1.0 h acid digestion time and 50 ℃ acid digestion temperature were the better acid digestion conditions. The reducing sugar was increased by 11.8 mg, and the average degree of polymerization of polysaccharides was 2.4.

Key words: punting bamboo, ethanol pulping, oligosaccharides, decolourisation, acetic acid hydrolysis

CLC Number:

TQ35

Miao XU, Qingwei PING, Xueru SHENG, Na LI, Jian ZHANG. Decolorization and Acetic Acid Hydrolysis of Punting Bamboo Ethanol Crude Sugar[J]. Chemistry and Industry of Forest Products, 2023, 43(3): 123-129.

Figures/Tables 6

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脱色剂¹⁾decolorants	透射率/%transmittance	总糖保留率/%total sugar retention rate
AC	99.20	21.37
D301R	94.76	98.40
201X4	93.50	84.60
711	95.37	90.72
D285	91.72	79.02

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Decolorization and Acetic Acid Hydrolysis of Punting Bamboo Ethanol Crude Sugar

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