微波辅助制备硬脂酸微孔红薯淀粉酯

以微孔红薯淀粉为原料,采用微波辅助制备硬脂酸微孔红薯淀粉酯。通过单因素试验和正交试验优化硬脂酸微孔红薯淀粉酯的制备工艺。结果表明：最佳制备工艺为硬脂酸添加量2%、盐酸添加量0.07%、微波时间4.0 min、微波功率480 W,在此条件下制得的硬脂酸微孔红薯淀粉酯吸油率为67.38%、取代度为0.071 2。     

醋酸钙和硬脂酸钠为固化剂研制固体酒精

介绍了分别以醋酸钙、硬脂酸钠为固化荆，研制安全、卫生、方便的固体燃料酒精的方法．     

Surface modification of barite nanoparticles using stearate

In this study, the barite nanoparticles were successfully modified with stearate and the influence of stearate addition on the performance of barite nanoparticles was systematically investigated. The products were characterized by activating factor analysis, contact angle test, surface energy calculation, sedimentation rate calculation, rheological measurement, and FT-IR analysis, etc. As the quantity of added stearate increased, both the activating factor and contact angle of barite nanoparticles increased first then decreased. When the stearate content was 5% of the mass of barite nanoparticles, the activating factor and water contact angle of modified particles reached maximum value, 97% and 126° respectively. At this time, the sedimentation rate reached minimum, and so did the surface energy. The rheological test reveals that the viscosity of modified barite nanoparticles/petronol system decreases greatly, indicating the surface performance of barite nanoparticles has changed from hydrophilicity to lipophilicity after modification. C=O and COO stretching vibration peaks were found in the FT-IR spectra, which proves that the stearate has combined onto the surface of barite nanoparticles. Finally, according to the zeta potential result of unmodified barite, the possible modification mechanism was provided. Project supported by the International Corporation Project (Grant No.07SU07001), and the Science Foundation of Science and Technology Commission of Shanghai Municipality (Grant No.0552nm011)     

浅谈单硬脂酸甘油脂的特性及其乳化剂作用的充分发挥

单硬脂酸甘油脂(简称单甘脂)是绝大多数食品加工的主要添加剂，对食品的最终品质产生重要影响。单甘脂价格昂贵，但由于其不溶解性，使其作用难以充分发挥，成本增加。本文总结了多年来在食品加工生产中高效发挥单甘脂乳化剂作用的实际经验。     

硬脂酸亚甲基C—H伸缩振动红外光谱研究

在293~393K温度范围内,分别采用一维红外光谱和二阶导数红外光谱测定了硬脂酸亚甲基伸缩振动模式νCH2。研究发现:室温下,2 914cm-1和2 848cm-1附近红外吸收谱带分别归属于硬脂酸亚甲基的不对称伸缩振动模式νasCH2和对称伸缩振动模式νsCH2。随着测定温度的升高,硬脂酸νasCH2和νsCH2的红外吸收频率向高频位置移动。进一步采用二维红外光谱研究了温度对于硬脂酸νCH2红外吸收强度变化趋势的影响,此项研究显示出二维红外光谱在生物材料热变性分析中的重大作用。     

负载型对甲苯磺酸催化剂的制备及其催化双酯化反应研究

以二氧化钛、二氧化硅、硅胶、活性炭、活性氧化铝等固体材料为载体分别负载对甲苯磺酸,硬脂酸和乙二醇双酯化反应为模版,筛选出高活性的负载型催化剂.实验结果表明,活性氧化铝负载对甲苯磺酸催化酯化反应活性最高.在该酯化反应条件下,探讨了不同负载方法、负载量、催化剂用量和催化剂重复使用对酯化反应的影响.当活性氧化铝负载对甲苯磺酸催化剂负载量为19.7%,催化剂用量为0.2g,反应温度130℃时,反应2h,产物产率可达97.1%.该负载型催化剂是一种选择性高、催化性能良好的环境友好型催化剂,而且重复使用效果好.     

可控微波促进AlCl_3催化下二酯类化合物的环境友好合成

利用可控微波加热技术,在无溶剂条件下,以Lewis酸为催化剂,羧酸与乙二醇、酸酐与一元醇发生双酯化反应,"一锅"法合成了不同类型的二酯类化合物.通过原料比、微波辐射时间、温度、催化剂种类及催化剂用量优化出最佳反应条件.在微波筛选条件的基础上,采用常规放大实验,合成克级二酯产物.产物的结构通过熔点测定、红外光谱分析确定.