共查询到20条相似文献,搜索用时 437 毫秒
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苹果汁中果酸(苹果酸)的分离(Ⅰ)--果酸在LSI-1031阴离子交换树脂上交换吸附行为的研究 总被引:3,自引:0,他引:3
研究了苹果汁中果酸在4种阴离子交换树脂上的静态吸附特性,其中LSI-1031阴离子交换树脂对果酸的交换吸附能力最强;系统测定并分析了果酸在LSI-1031阴离子交换树脂上交换吸附静态动力学、吸附等温曲线、动态动力学曲线及影响动态动力学曲线的因素,并确定了果酸交换吸附最佳工艺参数,结果表明:LSI-1031阴离子交换树脂吸附平衡时间为4h;20℃时,LSI-1031阴离子交换树脂吸附等温曲线符合Langmuir型吸附曲线;柱操作流速、果汁中果酸浓度以及温度对LSI-1031阴离子交换树脂动态动力学曲线都有影响,柱处理最佳条件为:流速3BV/h、温度50℃,并且低果酸浓度的果汁有利于提高树脂的处理量。 相似文献
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由玉米浸渍水生产植酸的研究 总被引:3,自引:0,他引:3
采用正交实验法。先将玉米浸渍水通过阴离子交换树脂吸附植酸,同时除去水中杂质,然后用一定浓度的氢氧化钠溶液解吸生成植酸钠,解吸液继续通过阳离子交换树脂即可得到植酸稀溶液,然后再使用升降膜式真空浓缩蒸发器浓缩植酸溶液到一定浓度即得到了产品植酸。通过对正交实验的结果用极差法进行处理,得到了提取植酸的最佳工艺条件:原料液吸附空速为3h-1,解吸剂解吸空速为2h-1,解吸液吸附空速为4h-1,解吸剂浓度为5%,解析温度为50℃。通过重复实验证明,此实验结果的重现性很好。 相似文献
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树脂对灵芝多糖色素吸附研究 总被引:1,自引:0,他引:1
分别从树脂极性、离子型、比表面积和平均孔径等特征,研究比较了八种大孔吸附树脂和四种离子交换树脂对灵芝多糖溶液脱色性能的影响,得出色素主要为阴离子型分子,同时还有少量的非极性和弱极性分子,比表面>180m2/g,孔径>20nm的大孔吸附树脂和功能基团-NH2阴离子交换树脂为适宜脱色树脂,筛选出D392阴离子交换树脂为较好的吸附灵芝多糖色素树脂,从不同温度,不同树脂用量下研究静态脱色工艺,进一步研究得出色素类型粗略含量和适宜的pH,最终确定D392阴离子交换树脂吸附灵芝多糖色素的静态工艺. 相似文献
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本文从实用角度出发,报道了将菲丁酸化后经过国产717(201×7)型阴离子交换树脂,再经过国产732(001×7)型阳子交换树脂制取植酸的过程。系统地对值酸进行了化学分析,设计了植酸制取与分析的流程。本研究对植酸的工业化生产具有一定的指导意义。 相似文献
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Matthew Caurie 《International Journal of Food Science & Technology》2006,41(2):173-179
The BET‐like adsorption equation, popularly known as the GAB equation, was derived from the BDDT adsorption equation without changes to the bulk liquid properties of multilayer molecules. Without these changes the third parameter K in the GAB equation cannot be said to measure changes in the bulk liquid properties of the multilayer molecules. Instead K measures the range of application of the GAB equation and differentiates multilayer adsorption, when K > 0.5, from singular layer adsorption, when K ≤ 0.5. The GAB equation, derived from and based on the BDDT theory is argued, in this paper, to provide a greater insight into the mechanism of water adsorption than the same equation derived from and based on the BET theory. 相似文献
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海泡石作为一种天然含水的镁硅酸盐粘土矿物,对卷烟烟气有优良的吸附性,本文实验就是利用海泡石的这一特性,先将海泡石进行高温活化,再将其与木浆混合配抄吸附型薄页纸,此纸可以卷制成滤嘴棒作卷烟滤嘴,实验得出,海泡石:针叶木浆=20:80,CMC添加量为0.075%时所抄纸页性能最佳。 相似文献
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为制备含杯芳烃的新型选择性吸附纤维,首先通过酰胺化和静电纺丝技术制备杯芳烃聚酰胺酸(CPAA)纤维,再将CPAA纤维通过热亚胺化制备得到杯芳烃聚酰亚胺(CPI)纤维,借助红外光谱仪、扫描电子显微镜、热重分析仪分析了纤维的结构和性能,并采用吸附实验研究了纤维的吸附选择性及动力学。结果表明:杯芳烃已引入纤维中,对比CPAA纤维,CPI纤维具有直径更小,主链分解温度更高的优点;CPI纤维可从Pt(Ⅳ)、Ag(Ⅰ)混合溶液中选择性吸附Pt(Ⅳ),溶液pH值为7时吸附量最大,达28 mg/g;CPI纤维吸附Pt(Ⅳ)符合一级动力学特征,20 ℃时吸附速率常数为0.003 9 min-1,且吸附速率常数随温度升高而增大;CPI纤维易吸附Pt(Ⅳ),吸附所克服的活化能较低,仅为12.24 kJ/mol。 相似文献
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General purpose adsorption isotherms 总被引:2,自引:0,他引:2
Kinniburgh DG 《Environmental science & technology》1986,20(9):895-904
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Lashaki MJ Fayaz M Wang HH Hashisho Z Philips JH Anderson JE Nichols M 《Environmental science & technology》2012,46(7):4083-4090
This paper investigates the effect of adsorption and regeneration temperature on the irreversible adsorption of a mixture of organic compounds typically emitted from automobile painting operations. Adsorption of the organic vapors mixture onto microporous beaded activated carbon (BAC) and regeneration of the saturated BAC were completed under different conditions. Results indicated that increasing the adsorption temperature from 25 to 35 or 45 °C increased heel buildup on BAC by about 30% irrespective of the regeneration temperature due to chemisorption. The adsorption capacity (for the first cycle) of the mixture onto the BAC at these three temperatures remained almost unchanged indicating chemisorption of some of these compounds onto the BAC. Increasing the regeneration temperature from 288 to 400 °C resulted in 61% reduction in the heel at all adsorption temperatures, possibly due to desorption of chemicals from narrow micropores. BET area and pore volumes of the BAC decreased proportionally to the cumulative heel. Pore size distribution and pore volume reduction confirmed that the heel was mainly built up in narrow micropores which can be occupied or blocked by some of the adsorbates. 相似文献
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