發(fā)布時(shí)間：2018-04-24 07:53

  本文選題：蘆葦乙醇制漿 + 蒸餾殘余物�。� 參考：《大連工業(yè)大學(xué)》2015年碩士論文

【摘要】：制漿蒸煮黑液中的降解糖含量豐富,對(duì)其中的降解糖進(jìn)行提取與純化,可以達(dá)到既能夠減少?gòu)U液污染,又能獲取社會(huì)效益和經(jīng)濟(jì)效益的目的。目前很少有對(duì)制漿廢液中的降解糖進(jìn)行回收和分離的系統(tǒng)研究,本研究針對(duì)蘆葦乙醇制漿的特點(diǎn),試圖對(duì)蘆葦乙醇逆流法制漿廢液的蒸餾殘余物進(jìn)行脫色,從而得到混合的降解糖,進(jìn)而為蘆葦制漿蒸煮廢液中降解的碳水化合物回收及綜合利用提供理論依據(jù)。主要的研究?jī)?nèi)容和結(jié)果如下:首先是蘆葦乙醇制漿蒸煮廢液蒸餾殘余物研究。通過(guò)減壓蒸餾和真空干燥收集蘆葦乙醇制漿蒸煮廢液蒸餾殘余物,利用離子色譜檢測(cè)其中的降解糖總含量高達(dá)54.38%,木糖含量為38.60%,而且木糖為總糖含量的70.98%,另外還有少量的Gal(半乳糖)、Glu(葡萄糖)和Ara(阿拉伯糖)。并且進(jìn)行了紅外光譜分析和熱重分析得出結(jié)論蒸餾殘余物主要為木素和降解糖的混合物。其次是蘆葦乙醇制漿蒸煮廢液蒸餾殘余物脫色方法初步研究。以脫色率以及降解糖保留率為考察指標(biāo),探討蘆葦乙醇制漿蒸煮廢液蒸餾殘余物脫色,蒸餾殘留物脫色率可采用紫外分光光度計(jì)法檢測(cè),經(jīng)過(guò)分析可知脫色率的最佳檢測(cè)波長(zhǎng)是282nm。樹(shù)脂、氧化鈣、活性炭和硅藻土四種吸附脫色方法中,D285大孔強(qiáng)堿苯乙烯系陰離子交換樹(shù)脂脫色效果最佳,色素的吸附過(guò)程完全遵循Freundlich方程。再次是蘆葦乙醇制漿蒸煮廢液蒸餾殘余物樹(shù)脂脫色工藝參數(shù)優(yōu)化研究。通過(guò)條件試驗(yàn)和正交試驗(yàn),以靜態(tài)脫色工藝參數(shù)為基礎(chǔ),探索D285樹(shù)脂用于蘆葦乙醇制漿蒸煮廢液蒸餾殘余物動(dòng)態(tài)脫色的工藝參數(shù),獲得最佳工藝參數(shù),以期為蘆葦乙醇制漿蒸煮廢液中的降解碳水化合物回收提供實(shí)驗(yàn)基礎(chǔ)。樹(shù)脂靜態(tài)脫色時(shí),溶液pH值6.00,脫色時(shí)間時(shí)間2h,樹(shù)脂用量0.04 gml-1,脫色溫度30℃,脫色率為89.93%,總糖保留率為93.52%。D285樹(shù)脂的動(dòng)態(tài)脫色工藝時(shí),溶液質(zhì)量濃度為6.00mg/ml,上柱液pH值6.5,溫度30℃,流速6ml/min(0.75BV/min),上樣量4BV,串聯(lián)3個(gè)樹(shù)脂脫色層析柱,脫色率為98.04%,總降解糖保留率為85.58%。最后是蘆葦乙醇制漿蒸煮廢液蒸餾殘余物脫色后所得樣品研究。蒸餾殘留物經(jīng)過(guò)復(fù)溶、樹(shù)脂脫色后,所得樣品中總糖含量達(dá)到了90.18%,其中木糖含量占總重的69.79%,復(fù)溶、樹(shù)脂脫色可以作為糖分分離手段。離子色譜法可以作為低聚木糖的定性、定量方法。經(jīng)離子色譜法檢測(cè),蒸餾殘余物經(jīng)樹(shù)脂脫色后,樣品中木糖單糖的含量為7.94%,聚合度在2到6之間的木糖(D2-6木糖)總含量為27.83%,聚合度大于等于7的木糖(D≥7木糖)含量為34.02%,其中D2-6木糖占總木糖的39.88%,D≥7木糖占總木糖的48.75%。100g絕干蘆葦原料,乙醇制漿蒸煮廢液蒸餾殘余物為7.15g,復(fù)溶脫色后剩余2.89g,其中木糖2.02g,D2-6木糖1.04g。
[Abstract]:The content of degraded sugar in the black liquor of pulping and cooking is rich. The extraction and purification of the degraded sugar can not only reduce the pollution of waste liquor, but also obtain social and economic benefits. There are few systematic studies on the recovery and separation of degraded sugar from pulping waste liquor. In this study, the distillation residue of Reed ethanol pulping waste liquor was decolorized according to the characteristics of Reed ethanol pulping. Thus, the mixed degradation sugar can be obtained, which provides a theoretical basis for the recovery and comprehensive utilization of carbohydrates degraded from Reed pulping and cooking waste liquor. The main research contents and results are as follows: firstly, the distillation residue of Reed ethanol pulping and cooking waste liquor is studied. The residue of Reed ethanol pulping waste liquor was collected by vacuum distillation and vacuum drying. The total content of degraded sugar was 54.38, xylose was 38.60, xylose was 70.98 percent of total sugar, and a small amount of Galal (glucose) and arabinose was detected by ion chromatography. Infrared spectroscopy and thermogravimetric analysis showed that the distillation residue was mainly a mixture of lignin and degraded sugar. Secondly, the method of decolorizing the waste liquor of Reed ethanol pulping was studied. The decolorization rate of waste liquor from Reed ethanol pulping and the decolorization rate of distilled residue can be determined by ultraviolet spectrophotometer. The optimum detection wavelength of decolorization rate is 282 nm. Among the four methods of adsorption and decolorization of resin, calcium oxide, activated carbon and diatomite, the decolorization effect of D285 macroporous strong alkali styrene anion exchange resin is the best, and the adsorption process of pigment follows Freundlich equation completely. Thirdly, the optimization of the technological parameters of the resin decolorization of Reed ethanol pulping waste liquor distilled residue resin was studied. Based on the static decolorization process parameters, the dynamic decolorization of waste distilled residue from Reed ethanol pulping was studied by condition test and orthogonal test, and the optimum process parameters were obtained. In order to provide experimental basis for the recovery of degraded carbohydrates from Reed ethanol pulping waste liquor. The solution pH value was 6.00, the decolorization time was 2 hours, the resin dosage was 0.04 g / ml-1, the decolorization temperature was 30 鈩，

本文編號(hào)：1795786