共查询到20条相似文献,搜索用时 234 毫秒
1.
2.
3.
4.
5.
6.
7.
均匀设计法优选辅酶Q_(10)的超声提取工艺 总被引:4,自引:2,他引:4
用均匀设计法优化了以新鲜烟叶为原料,超声提取辅酶Q10的工艺。考察了超声时间、温度、液料比和超声功率4个因素对辅酶Q10提取率的影响,并对提取过程用多元回归方程进行了数值模拟。实验得到优化的辅酶Q10超声提取工艺条件为:提取溶剂体积分数85%乙醇,液料体积质量比18 mL/g,超声温度45℃,超声时间45 m in,超声功率250 W。结果表明,超声法提取对烟叶中辅酶Q10的提取质量分率为7.12×10-6,其提取率是索氏提取的1.34倍,实验结果与回归方程的拟合值吻合良好,说明应用超声法提取烟叶中的辅酶Q10是可行的。 相似文献
8.
9.
实验考察了料液比、超声时间、超声功率三个因素对蛋黄中类胡萝卜素提取率的影响,并采用响应面分析法选出最佳工艺条件。实验结果表明最佳条件为:液料比12m L/g,超声提取时间10 min,超声提取功率200 W。最佳条件下类胡萝卜素提取率实测值为0.229 mg/g,与预测值基本一致,这说明响应面分析法可以优化超声法提取蛋黄总类胡萝卜素的工艺条件。 相似文献
10.
11.
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
12.
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.
__________
Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
13.
14.
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
15.
17.
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
18.
1 INTRODUCTIONBecause of importance of equations of state (EOS)in science and industry,hundreds forms of EOS havebeen presented since latter 19th century.It seems impossible to develop a general equation covering vari-ous kinds of EOS.But for cubic EOS,several generalequations have been reported already. Martin presented the first general equation whichis following p=RT/V-α(T)/(υ β)(υ γ) δ(T)/υ(υ β)(υ γ) (1) Kumar et a1.presented an equation called the most general form of a density-cubic or, alterna tively,volume-cubic mathematical equation,the form of which is as follows 相似文献
19.
20.