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高碘酸钠氧化淀粉制备双醛淀粉的研究 总被引:1,自引:0,他引:1
以甘薯淀粉为原料,以高碘酸钠为氧化剂制备双醛淀粉的工艺条件和流程。在合适的条件下,反应时间3小时,反应温度30℃,NalO4浓度为0.32mol/l,NalO4与淀粉的摩尔比为1.1:1,所得淀粉的双醛含量接近100%,产品得率达到95%以上。氧化剂高碘酸钠的消耗量大约为理论量,且可通过电解再生,重复使用,避免了大量消耗昂贵高碘酸钠和环境污染,具有实际的应用前景。 相似文献
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碘酸钠氧化再生高碘酸钠的电极行为研究 总被引:3,自引:0,他引:3
报导以高碘酸钠为媒质间接电合成双醛淀粉过程中,生成的碘酸钠电解氧化再生高碘酸钠的电极效率与电极材料,电解条件等的关系,从而为其媒质再生的研究提供依据。 相似文献
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在以二甲基亚砜为溶剂的均相反应体系中,以双醛淀粉和苯胺为底物,乙酸为催化剂,N2保护下,合成了双醛淀粉-苯胺希夫碱。得到的最佳反应条件为:以二甲基亚砜为溶剂,双醛淀粉质量浓度为100 g/L,体系中乙酸体积分数3%,反应温度50℃,醛基与氨基的摩尔比为2:1,反应时间12 h。在最佳条件下,以双醛摩尔分数为5%的双醛淀粉(DAS5)为底物的苯胺利用率为94%;以双醛摩尔分数为20%的双醛淀粉(DAS20)为底物的苯胺利用率为55%。通过FTIR、NMR和XRD对双醛淀粉-苯胺希夫碱的结构进行了表征。 相似文献
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以木薯淀粉为原料、高碘酸钠为氧化剂,在一定条件下制得双醛淀粉(DAS);然后以过硫酸铵(APS)为引发剂、聚乙烯醇(PVA)为保护胶体和醋酸乙烯酯(VAc)为DAS的接枝单体,再配合其他助剂制得双醛接枝淀粉基木材用胶粘剂。结果表明:当w(DAS中醛基)=20%、m(DAS)∶m(VAc)=1∶2.5、w(PVA)=75%、VAc为25 mL、接枝反应温度为65℃和反应时间为3 h时,胶粘剂的干、湿强度分别为3.0、2.4 MPa。 相似文献
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双醛淀粉具有广阔的应用领域,本文介绍了其在造纸工业、建筑材料、纺织工业、薄膜、皮革工 业、感光记录材料、医药卫生、食品及饲料等方面的用途。国内目前只在医药方面有少量应用。由于制取双醛 淀粉使用的高磺酸钠价格较贵,所以对于工业化生产必须解决好高碘酸钠的回收再生问题。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献