共查询到19条相似文献,搜索用时 78 毫秒
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以盐酸酸化凹凸棒土为脱色剂,对废食用油进行脱色。通过单因素实验找到最佳脱色条件,并在此基础上,以凹凸棒土盐酸酸化浓度、酸化凹凸棒土使用量、脱色温度、脱色时间为考察因素,以废食用油脱色率为响应参数,使用响应面方法进行优化设计。结果表明,在最优化状态下的脱色条件为:脱色剂(酸化凹凸棒土)酸化浓度3.0 mol/L、脱色剂(酸化凹凸棒土)使用量15.6%、脱色温度111.0℃、脱色时间23.0 min,在此条件下测得废食用油脱色率最高可达87.63%,脱色后的废食用油接近无色。该方法耗费低廉、简便高效,脱色剂容易再生利用、对环境友好,可用于废弃油脂资源化利用的前期处理。 相似文献
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响应面法优化竹材热裂解制备生物油的工艺研究 总被引:1,自引:0,他引:1
为了提高竹材生物质流化床快速热裂解制备生物油产率,利用响应面法优化其最佳工艺条件.试验选择热裂解温度(450~550℃)、气相停留时间(1.5~2.5 s)和物料粒径(0.18 ~0.22 mm)三因素作为独立变量,采用中心组合设计建立模型和考察上述因素对生物油收率的影响.结果表明三因素对生物油收率具有显著影响而它们之间的交互作用均不显著.依据所得到的模型,在各因素设定范围内获得的最佳工艺条件为:热裂解温度519.0℃、气相停留时间2.1s、物料粒径0.18mm,生物油理论收率为58.17%.在该条件下进行的三次重复试验,竹材生物油的实际平均收率为57.85%,与模型预测值58.17%无显著差异.响应面法简便、高效,优化结果能给生物质流化床快速热裂解制备生物油制备工艺提供一定的参考. 相似文献
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以油菜秸秆为原料,采用真空热解系统进行了制取生物油的中心组合实验研究,以热解终温、体系压力和升温速率为实验因子,生物油产率为实验指标,利用响应面法(RSM)对制备生物油的工艺参数进行了优化,并对在最优条件下制取的生物油进行了理化特性和化学组成分析。研究结果表明,热解终温、体系压力和升温速率对生物油产率有显著影响,热解终温和升温速率之间的交互作用显著;获得最佳热解液化工艺条件为:热解终温490.0℃、体系压力5.0 k Pa、升温速率20.0℃·min-1,在此条件下,生物油产率可达41.65%。与预测值42.00%较为接近。油菜秸秆真空热解所得生物油的含水量为33.85%,热值为18.65 MJ·kg-1,常温下的运动黏度为4.16 mm2·s-1,密度和p H值分别为1.14g·cm·3和2.32;生物油成分较为复杂,其中多种有机物可被进一步提取用作化工原料;生物油中羧酸、醛、酮类等腐蚀性和不稳定组分含量较高,需对其进一步精制,以提高其稳定性。 相似文献
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在单因素实验的基础上,利用响应曲面法对槲皮素与醋酸锌络合反应的工艺参数进行优化。响应曲面分析结果表明,反应温度,反应时间以及体系的pH值对槲皮素锌的产率存在显著的相关性,通过典型分析得到优化的络合反应条件为:反应温度为43℃,反应时间72min,pH9.3,在此条件下产率的理论值达86.7%。验证实验最大产率为82.93%。且槲皮素-锌在水中的溶解度为811.20μg/mL比原槲皮素的溶解度增大了169倍。 相似文献
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《分离科学与技术》2012,47(6):977-983
Alcohol precipitation (AP) is a common method to achieve separation and purification in the process of food and herbal preparations. The response surface methodology (RSM) was applied to study and optimize the AP of Danshen, regarding the recovery of danshensu (RD) and the removal of saccharides (RS). A fractional factorial design was initially performed and solid content, ethanol consumption, acid consumption, and temperature showed significant influence on RD and RS. A Box-Behnken design with 28 experimental runs was then applied and two polynomial equations were established, based on which the effects of significant factors and their interactions were discussed. The optimum operating conditions were solid content at 66.0%, ethanol consumption at 4.3 mL/g, acid consumption at 0 g/g, and temperature at 10.7°C. The average experimental RD and RS under the optimum conditions were obtained to be 66.25 ± 1.01% and 61.64 ± 1.84%, respectively, which agreed well with the predicted values (68.85% for RD and 61.92% for RS). 相似文献
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响应面法优化季戊四醇三烯丙基醚合成 总被引:1,自引:0,他引:1
以季戊四醇、氢氧化钠和氯丙烯为原料,在相转移催化剂作用下,经Williamson醚化反应合成季戊四醇三烯丙基醚。采用响应面法探讨了反应温度、NaOH的质量分数和催化剂四丁基溴化铵用量等因素对产品收率的影响,并建立了相应的预测模型。结果表明:NaOH的质量分数和催化剂四丁基溴化铵用量这两个因素对收率影响显著,温度和催化剂四丁基溴化铵的用量交互效应影响显著。得到了季戊四醇三烯丙基醚合成的最适宜工艺条件:四丁基溴化铵作催化剂,反应温度为78.0℃、NaOH的质量分数为54.9%、催化剂与三羟甲基丙烷的质量之比为11.1%时获得最高收率70.2%。 相似文献
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The biosynthesis of structured lipids (SL) in organic solvent media was carried out by the interesterification of flaxseed oil (FO) and tricaprylin (TC), using Novozym 435. The bioconversion yield (BY, %) of medium-long-medium type SL, including C-caprylic and Ln-linolenic acids (CLnC), La-linoleic acid (CLaC) and O-oleic acid (COC), was monitored. Response surface methodology was used to obtain significant models for the responses, on the basis of a five level, five variable central composite rotatable design. In the experimental preliminary trials significant reaction parameters, including reaction temperature (T r), TC/FO molar ratio (M r), enzyme concentration (E c), reaction time (R t) and initial water activity (a w), were considered for optimization. Significant models for CLnC, CLaC and COC were determined after regression analysis with backward elimination. The optimal conditions, generated for a maximum CLnC, CLaC and COC, were found to be 54.50–56.25 °C for T r, 6.23–6.25 mol/mol for M r, 2.68–3.13 % for E c, 36.58–37.50 h for R t and 0.15–0.33 for a w. Under these optimum conditions, the BY of CLnC, CLaC and COC was predicted to be 32.48–36.67, 3.26–3.38 and 5.79–6.16 %, respectively. 相似文献