助手标题
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
共[1136]条 当前为第1条到20条[由于搜索限制,当前仅支持显示前5页数据]
 

相关语句
time
    The testing and determination of the solidification time of rapidly solidified powder coating materials and a specially used heating bath
    快速固化粉末涂料固化时间的测定及专用加热池
    The optimum conditions for synthesizing the intermediate,4-hydroxy-2-octanone are as follows: reaction time,6 h; reaction temperature,(25 °C); concentration of alkali,4%;
    缩合反应合成中间体4-羟基-2-辛酮的最佳条件为:反应时间6 h,反应温度25°C,碱的浓度4%,丙酮与戊酮的摩尔比4∶1,脱水采用磷酸,副产物少,收率高(85%);
    The results showed that the optimal conditions for synthesis of benzyl acetate were: the molar ratio of acetic acid to benzyl alcohol was 2∶1,the amount of the water carrier was 40%,the amount of the catalyst was 3.5%,and reaction time was 6 h.
    结果表明,乙酸苄酯最适宜的合成工艺条件为:酸醇摩尔比2∶1、催化剂用量3.5%(占总质量)、带水剂(苯)用量40%(占总质量)、反应时间6 h。
    g-1,the degree of circumfluence was two,and the every time of extraction was 1h was optimal.
    g-1,回流次数为2次,回流时间为每次1 h的条件下,提取效果最好。
    Isoamyl isovalerate was synthesized through esterification reaction by using isovaleric acid and isoamyl alcohol as raw materials and nano-H4SiW12O40/SiO2 as catalyst, the influencing factors in the reaction were studied, and the results showed that the esterification rate could reach 98.6 % under the conditions of the ratio of alcohol-acid 1.4∶1, the use level of catalyst 5 %, and the reaction time 1.5 h.
    以纳米复合钨硅杂多酸为催化剂,异戊酸和异戊醇为原料,通过酯化反应合成苹果油,对酯化反应的影响因素进行了研究,结果表明,在醇酸物质的量比为1.4∶1,催化剂用量5%,反应时间1.5h的条件下,酯化率可达98.6%。
    Extraction of seed oil from Vitis amurensis Rupr.with supercritical CO2 extraction was studied. It focused on the effect of comminution granularity,extraction pressure,temperature and time on the oil production rate.
    对超临界CO2萃取山葡萄籽油的工艺条件进行了研究,研究了原料粉碎粒度、萃取压力、萃取温度和萃取时间对葡萄籽出油率的影响。
    The results showed that the optimal comminution granularity,pressure,temperature and extraction time were 60,30Mpa,35℃ and 160min respectively. On this condition,the production rate of the oil can reach 18.31%.
    结果表明:原料粉碎粒度60目,萃取压力30Mpa,萃取温度35℃,萃取时间160min为最佳工艺条件,在此条件下,出油率可达18.31%。
    we studied the stability of pure solanesol and coarse solanesol,the influence of extraction method,extraction solvent,the proportion of liquid-solid and extration time.
    考察了提取方法、提取溶剂、提取时间、溶剂液固比等对烟叶中茄尼醇粗品提取率的影响。 结果表明:茄尼醇精品储存稳定性较差;
    In this paper, the optimum condition of supercritical CO2 extraction of ginger essential oil was investigated with orthogonal design. The optimum process conditions obtained are as following: extraction pressure 20MPa, work temperature 40℃, extraction time: 90min.
    采用正交试验的方法,确定了超临界CO2萃取姜精油的最佳工艺条件:萃取温度40℃,萃取压力20MPa,萃取时间90min;
    It was discussed that the effects of extracting pressure, temperature and time on the extraction efficiencies of the camellia oil by supercritical CO2.The optimal extracting conditions are determined: extracting pressure 25MPa, the temperature 40℃ and the time 2.5 hours. The extraction efficiencies of camellia oils was up to 97.5%.
    研究了超临界CO2萃取茶油时,萃取压力、温度、时间对茶油提取率的影响,结果表明,萃取压力25MPa,温度40℃,萃取时间为2.5h时,茶油的提取率达到97.5%。
    The factors of time, temperature which influence saponification were simply studied. The optimum conditions for saponification: 1h, 60℃. Under these conditions, a fatty acid yield of 93.2% was obtained, and the product contained 5.72% EPA, 10.55% DHA and 4.83% DPA.
    研究了3种因素即皂化时间、乙醇/水(v/v)比例和皂化温度对海狗油皂化效果的影响,结果显示较好的皂化条件为皂化时间1h、乙醇/水(v/v)比例6∶1、皂化温度60℃,在此条件下脂肪酸的产率为93.2%,其中含EPA5.72%、DHA10.55%和DPA4.83%。
    Synthesis of isoamyl laurate from lauric acid and isoamyl alcohol with nanometer H3PW12O40 / SiO2 as catalyst is studied, the results showed that nanometer H3PW12O40/ SiO2 was a good catalyst for synthesizing isoamyl laurate, the oplimal conditions were found as follows: molar ratio of lauric acid to isoamyl alcohol was 1∶5, the weight of catalyst was 5%, the reaction time was 2h, yield was about 99.1%.
    以纳米型复合杂多酸H3PW12O40/SiO2为催化剂,月桂酸和异戊醇为原料,合成月桂酸异戊酯。 实验结果表明,纳米复合磷钨酸是合成月桂酸异戊酯的良好催化剂,适宜的工艺条件为酸醇物质的量比为1︰5、催化剂用量占酸质量的5%、回流反应时间为2h,酯化率可达99.1%。
    the optimal fermentation condition were obtained as follow: initial pH value 7.5,temperauture 30℃,fermentation time 96h,seeding volume 7%,rotated speed 180r/min,75 ml medium in 500ml flask.
    最佳培养条件为:初始pH值为7.5、温度为30℃、培养时间为96h、接种量为7%,摇床转速为180r/min,摇瓶装液量为75ml/500ml。
    The optimal technological conditions of sulfonation which obtained by orthogonal tests were:n(castor oil acid)∶n(sulfuric acid)=1∶2,reaction temperature is 50 ℃ and reaction time is 6 h.
    结果表明,最佳工艺条件为:n(蓖麻油酸)∶n(浓硫酸)=1∶2,反应温度50℃,反应时间6h。
    The influence of substrate concentration,reaction time etc. on the synthesis of L-ascorbic acid esters were also investigated and the reaction conditions were optimized. For hardened palm oil,the optimum reaction conditions were as follow: reaction time 9 hours under 55 ℃ with the initial concentration of oil 200~600 mmol/L.
    对影响合成抗坏血酸脂肪酸酯的因素进行了探讨,确定了最适反应条件:初始油脂底物浓度为200~600mmol/L,温度为55℃,反应时间为9h。
    The best conditions of the method were: the ratio of clove powder to water:1∶10,and time of distillation: 90 min,the yield of the oil 12.96% with the content of eugenol in clove oil 95.38%.
    快速提取法提取丁香油的最佳条件为:原料与水比为1∶10,提取回流时间为90m in,产品收率达12.96%,且含丁香酚95.38%。
    The results showed the optimum technological condition of extraction:material weight 300 g,grinding granalarity 0.297 mm; working pressure 35 MPa,extraction temperature 30-35 ℃,carbon dioxide flow rate 25 kg/h,extraction time 2 h. Under this condition,the extraction rate of apple seeds oil is 22.85%;
    结果表明,苹果籽油的CO2超临界流体最佳萃取条件为:投料量300 g,原料破碎度0.297 mm,萃取压力35 M Pa,萃取温度30-35℃,CO2流量25 kg/h,萃取时间2 h,在此条件下苹果籽油萃取率可达22.85%;
    The optimum reaction conditions were: the molar ratio of ethyl acetoacetate to ethylene glycol was 1:1.8,the quantity of catalyst was equal to 2% ethyl acetaoacetate,amount of cyclohexane was 20mL,and the reaction time was 3h.
    最佳反应条件为:n(乙酰乙酸乙酯):n(乙二醇)=1:1.8,催化剂用量为乙酰乙酸乙酯质量的2%,带水剂用量为20mL,反应时间3h。
    The optimum operating conditions are extraction pressure 20MPa,time 120 min,temperature 45℃flow of Carbon Dioxide 20 L/h.
    优化的工艺条件为萃取压力22 MPa、温度45℃、CO2流量20 L/h,萃取时间120 m in。
    The optimal conditions of pilot-plant process by IPA extraction were:75℃ extraction temperature,3 h extraction time,3 extraction times,and moisture contents of oilseeds 11.02%. Under the optimal conditions the residual oil of meal was 1.06%.
    结合实际生产要求得到异丙醇浸出工艺条件为:浸出温度75℃,浸出时间3 h,浸出次数3次,原料水分含量11.02%,此时粕中残油率为1.06%。
 

首页上一页12345下一页尾页 

 
CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社