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微波辐射法提取柚皮、橙皮的挥发油 总被引:4,自引:0,他引:4
The essence oil of citrus grandis peel and orange peel was extracted by the microwave method in this article.The results show that the best condition of extracting is when 100 g peel is extracted at 360 W with n-hexane for 50 s,the obtained rate of pomelo oil is 1.73% and orange oil is 0.65%. 相似文献
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本文以St-DVB微凝胶/甲基丙烯酸两性接枝共聚物制成了一种新型“浮萍”结构的单分子膜,并转移制备了LB多层膜,对其单分子膜的性质、LB多层膜的二维有序结构及膜的热稳定性进行了较深入的研究。 相似文献
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LIU Jia WANG Hong-liang L Chun-xin LIU Han-fei GUO Zhi-xin KANG Chun-li 《高等学校化学研究》2013,29(3):445-448
At present, heavy metal pollution has become a major environmental problem, influencing the survival of human and other creatures. Developing heavy metal ion adsorbents, which are environment friendly, of low cost and good performance is one of the effective means to solve heavy metal pollution. Rich low-grade diatomite mineral, as raw material, was modified with calcium carbonate to improve the adsorption properties of diatomite for heavy metal ions. The effects of dosage(m), pH, adsorbing time(t), temperature(T) and concentration of adsorbent(c) on the removal rate of heavy metal ions(Cu2+, Pb2+, Zn2+ and Cd2+) were studied. The results show that under the suitable conditions, T=15 ℃, c=1.5 mmol/L, m=10 g/L, t=60 min, in a weak acid environment, the removal effect of the four kinds of metal ions by modified diatomite is the best. 相似文献
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以不同活性的轻烧MgO和α-Al2 O3微粉为原料,通过固相烧结法合成镁铝尖晶石,研究轻烧氧化镁的活性对镁铝尖晶石物相组成、晶胞参数、微观结构及烧结性能的影响并探讨其机理.利用XRD和HighScore Plus分析合成试样的物相组成和晶胞参数,利用SEM表征合成试样的微观结构.结果表明:高活性轻烧MgO具有更高的缺陷能,可以加快烧结反应的进行,降低MgAl2 O4的合成温度;高活性轻烧MgO可以促进MgAl2 O4晶体发育,MgO活性越高,生成的MgAl2 O4晶胞参数和晶胞体积越大,晶粒发育更为完全. 相似文献
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Chun-xin Yuan Li-wei Liu Tian-ming Wang Chun Li 《Journal of mathematical chemistry》2008,43(3):1177-1183
In this article, we consider the influence of variation of DNA sequence on the leading eigenvalue of graphical representation
of the biological sequences. The research interpret the rationality of the graphical representation method that compare different
DNA sequences. And we show the result on two different models that presented before.
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采用低温等离子体法在温和条件下制备了低碳醇合成(HAS)用的高性能KNiMo基催化剂,利用XRD、氮吸附、TEM、H2-TPD、CO-TPD和原位CO吸附DRIFTS等技术对其进行了表征。结果表明,与传统的热法制备相比,低温等离子体法不仅缩短了制备时间,而且得到的KNiMo基催化剂层数少、粒径小、分散度高,有利于形成更薄和更短的片层,并暴露大量位于边、角位的催化活性位,促进CO转化和醇的形成,表现出优异的低碳醇合成催化性能。其中,采用低温等离子体直接制备的KNiMo-DPS催化剂,在5 MPa、350℃、空速为5000 h-1的反应条件下,CO转化率达到32.3%,总醇选择性为75.1%,总醇中C2+醇的选择性为65.2%。 相似文献
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