酸法醇介质制备玉米多孔淀粉

研究了以玉米淀粉为原料酸法醇介质制备多孔淀粉的最佳工艺条件.在考察盐酸质量分数、乙醇体积分数、淀粉浆液质量分数和水解时间对产品吸附能力影响的基础上,通过正交实验优化了其制备工艺.实验结果表明,酸法醇介质制备玉米多孔淀粉的最佳工艺条件为:保持水解温度为80～81℃情况下,盐酸质量分数为2%,乙醇体积分数为80%,淀粉浆液质量分数为30%,水解时间为3 h.此条件下,产品吸油率为52.1%,柠檬黄色素吸附量为1.76 ms/g,产品得率为60.3%.

Ethanol Extract of Vitex Doniana as a Green Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Medium

Corrosion is a costly and complicated problem facing mild of Vitex doniana as a corrosion inhibitor for mild steel in HCI medium steel utility. This study investigated the use of ethanol extract Experimental methods used are gravimetric and thermometric The results showed that corrosion rate decreased as the concentration of ethanol extract of Vitex doniana increased and with decrease in temperature. Vitex doniana extract obeyed Langmuir and Tempkin adsorption isotherm. Physical adsorption was proposed from △G° and Ea. Inhibition efficiency （1%） and the degree of surface coverage （0） were calculated and all indicated that Vitex doniana was a good corrosion inhibitor.