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以工业级正己烷为原料,通过脱色-连续精馏-过滤等一系列纯化工艺制备农残级正己烷,用紫外吸光度、纯度(GC-FID)和杂质峰高(GC-ECD)等检测值作为农残质量控制指标。产品质量与占当前国内垄断市场的进口试剂水平相当。通过试验确定了较为合适的工艺条件:二氧化硅为脱色剂,用量是原料质量的2%,然后用10%的蒸馏水水洗一次,连续精馏装置的导热油加热温度为88℃,脱轻塔和成品塔的回流比分别为10∶1和4∶1,重组分放料速率20 mL/min,产率可达70%左右。
Commercial grade n-hexane was used as a raw material to prepare pesticide-grade n-hexane by a series of purification processes such as decolorization-continuous rectification-filtration. The detected values were as follows: UV absorbance, GC-FID and GC- As a pesticide quality control indicators. Product quality and accounting for the current domestic monopoly market, the level of imported reagents quite. Through the experiment, the suitable process conditions were determined: silica is the decoloring agent, the dosage is 2% of the raw material, and then washed once with 10% distilled water. The temperature of HTF of the continuous distillation unit is 88 ℃, And finished tower reflux ratio were 10: 1 and 4: 1, the weight fraction of 20 mL / min, the yield of up to 70%.