稻草酶水解液脱色工艺的研究

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摘要：木质纤维素原料酶水解后得到的水解液进一步过滤、脱色、离交、结晶可得到商品糖。稻草秸秆本身为棕褐色，水解后又有大量色素产生，水解液的颜色呈更深的褐色，使其在色泽上不易被人们所接受，影响糖产品感官品质和开发利用。本论文主要研究了稻草秸秆酶水解的脱色工艺，采用活性炭对稻草酶水解液进行脱色处理，采用单因素试验法，考查活性炭用量、脱色温度、脱色时间对水解液脱色率、总糖得率的影响。优化后的稻草酶水解液脱色最佳工艺为：采用粉末活性炭，活性炭用量为2%、脱色温度为70℃、脱色时间为40min。在此条件下脱色率为95.1%、含糖率为88.9%。57682

毕业论文关键词：总糖得率，酶解液，脱色，活性炭

Abstract: Commercial sugar can be obtained from enzymatic hydrolysate of lignocellulose resources after further filtration, decolorization, ionexchange and crystallization. The color of the hydrolysate is dark brown because of the primary color of rice straw and pigment produced from hydrolysis of lignocellulose resources. The color is not easy to be accepted by people which affects the sensory quality and the development and utilization of sugar products. This paper mainly studied the technology of decolorization by activated carbon. Single factor experiments were conducted to obtain the best decoloring conditions. The influences of the dosage of activated carbon, decolorization temperature, adsorption time on hydrolysate decoloration rate and yield of total sugar were researched. The best decoloring conditions were obtained as followed: the powdered activated carbon was used, the dosage of activated carbon was 2%, decolorization temperature was 70 ℃, adsorption time was 40min under which the decoloration rate was 95.1% and the yield of total sugar was 88.9%.

Keywords: yield of total sugar, hydrolyzate, discoloration, activated carbon

1 绪论 4

1.1 选题背景和意义 4

1.2 文献综述 4

2 稻草碱水解液脱色工艺的研究 5

2.1 实验材料与方法 5

2.1.1 实验材料及实验设备 5

2.1.2 实验方法 5

2.1.3 实验设计及步骤 8

2.1.4 数据处理及分析 9

结论 19

参考文献 20

致谢 21

1 绪论

1.1 选题背景和意义

在我国，稻草秸秆是产量庞大的秸秆生物质资源，每年产量约1.15亿吨[1]。然而，秸秆焚烧一直以来是一件比较棘手的问题，焚烧产生大量的CO2并且带来了雾霾的危害。将水稻秸秆转化成容易利用的单糖可以解决环境问题，还能产生良好的经济效益。

秸秆经过葡萄糖酶水解过后，能够得到含有多糖的酶水解产物，稻草也不例外。其在经过葡萄糖酶水解后，产生了含有葡萄糖的稻草酶水解液。我国的秸秆资源十分丰富，可利用的生物质原料每年总量可达20亿吨以上，其中大部分都尚未被利用，有些甚至还造成周围环境的污染[2]。因此，有效利用秸秆生物质发展生物能源，不仅可以解决人类面临的能源危机，还可以充分利用自然资源实现废物利用，缓解粮食危机，同时还能减少CO2排放，改善环境问题。对于缓解当今世界环境、能源、生态问题所带来的压力具有重大意义。

1.2 文献综述