目的探究茜素的加入对马铃薯淀粉基复合膜理化性质的影响,并评估其氨响应行为。方法以马铃薯淀粉为成膜基质,通过流延法制备淀粉基生物薄膜,并在其内部嵌入天然色素—茜素,制备茜素-马铃薯淀粉复合膜,通过紫外可见吸收光谱、傅里叶红外...目的探究茜素的加入对马铃薯淀粉基复合膜理化性质的影响,并评估其氨响应行为。方法以马铃薯淀粉为成膜基质,通过流延法制备淀粉基生物薄膜,并在其内部嵌入天然色素—茜素,制备茜素-马铃薯淀粉复合膜,通过紫外可见吸收光谱、傅里叶红外光谱等对复合膜的结构进行表征。结果实验表明,添加3 mg/mL的茜素对复合膜的厚度、含水量、水接触角、化学和晶体结构均无明显影响,但显著改善了复合膜的光阻隔性能、拉伸强度、断裂伸长率和热稳定性。在实验室12 W LED T8节能灯正常发光条件下,复合膜对2500 mg/L的氨水表现出肉眼可见的由黄色到紫色的颜色转变,且茜素-马铃薯淀粉复合膜的氨响应行为在循环利用4次后并未表现出衰减。结论茜素可有效改善马铃薯淀粉基复合膜的理化性能,并使复合膜表现出良好的氨响应行为,有潜力应用于高蛋白食品新鲜度的日光下可视化检测。展开更多
The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems,such as requiring larger amounts of ammonia and...The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems,such as requiring larger amounts of ammonia and solvent,and higher energy consumption of regeneration solvent.To overcome the shortcomings of the ammonia-alcohol method,this paper experimentally studied the green deacidification technology of diesel by the ammonia-alcohol method,which used low-temperature coalescence filtration in a self-made experimental device.The effects of coalescence filtration temperature,amount of ammonia,alcohol consumption,volume ratio of solvent to oil on the deacidification process,material regeneration of coalescence filtration,deacidification’s turndown ratio and the product quality of naphthenic acid were studied.The results showed that under the optimum operation condition,the acidity of straight-run diesel could decrease from 62.9 mg KOH·(100 ml)-1 to 4.2 mg KOH·(100 ml)-1,the acid removal rate was as high as 93.3%,and product recovery could reach 98.6%.After refining,the quality of diesel could meet industry requirements [acidity X<7.0 mg KOH·(100 ml)-1],and raw acid value of naphthenic acid could meet No.2 acid standards of SH/T 0530—92.This method had the advantages of simple technological process,low operating temperature of deacidification,less ammonia and solvent consumption,low solvent regeneration energy consumption and higher turndown ratio.展开更多
文摘目的探究茜素的加入对马铃薯淀粉基复合膜理化性质的影响,并评估其氨响应行为。方法以马铃薯淀粉为成膜基质,通过流延法制备淀粉基生物薄膜,并在其内部嵌入天然色素—茜素,制备茜素-马铃薯淀粉复合膜,通过紫外可见吸收光谱、傅里叶红外光谱等对复合膜的结构进行表征。结果实验表明,添加3 mg/mL的茜素对复合膜的厚度、含水量、水接触角、化学和晶体结构均无明显影响,但显著改善了复合膜的光阻隔性能、拉伸强度、断裂伸长率和热稳定性。在实验室12 W LED T8节能灯正常发光条件下,复合膜对2500 mg/L的氨水表现出肉眼可见的由黄色到紫色的颜色转变,且茜素-马铃薯淀粉复合膜的氨响应行为在循环利用4次后并未表现出衰减。结论茜素可有效改善马铃薯淀粉基复合膜的理化性能,并使复合膜表现出良好的氨响应行为,有潜力应用于高蛋白食品新鲜度的日光下可视化检测。
文摘The green deacidification technology of diesel by the ammonia-alcohol method without using strong acid and strong base can achieve zero-emission.But it has some problems,such as requiring larger amounts of ammonia and solvent,and higher energy consumption of regeneration solvent.To overcome the shortcomings of the ammonia-alcohol method,this paper experimentally studied the green deacidification technology of diesel by the ammonia-alcohol method,which used low-temperature coalescence filtration in a self-made experimental device.The effects of coalescence filtration temperature,amount of ammonia,alcohol consumption,volume ratio of solvent to oil on the deacidification process,material regeneration of coalescence filtration,deacidification’s turndown ratio and the product quality of naphthenic acid were studied.The results showed that under the optimum operation condition,the acidity of straight-run diesel could decrease from 62.9 mg KOH·(100 ml)-1 to 4.2 mg KOH·(100 ml)-1,the acid removal rate was as high as 93.3%,and product recovery could reach 98.6%.After refining,the quality of diesel could meet industry requirements [acidity X<7.0 mg KOH·(100 ml)-1],and raw acid value of naphthenic acid could meet No.2 acid standards of SH/T 0530—92.This method had the advantages of simple technological process,low operating temperature of deacidification,less ammonia and solvent consumption,low solvent regeneration energy consumption and higher turndown ratio.
