熔盐热裂解大豆油的特性研究

Pyrolysis of soybean oil with molten salt for bio-fuel

以大豆油为原料,在ZnCl2-KCl熔融盐体系中考察了进料速量、载气流量、反应温度及进料量对其热裂解的影响。采用气相色谱-质谱联用仪(GC-MS)表征生物油组成。结果表明,进料速量和载气流量主要通过改变大豆油的反应停留时间影响裂解效果。当进料速率为1.2 g/min及不通载气时,大豆油停留时间较长,裂解较充分;随着温度升高,生物油得率增大,含氧化合物含量及酸值上升;随着进料量增大,生物油得率稳定在70%左右,但脱羧效果有所下降。经过催化加氢,生物油性质得到了明显的改善,组分分布与0#柴油分布大体相似。

Pyrolysis of soybean oil was carded out in a ZnC12-KC1 molten salt. The effects of feed rate, flow rate of carrier gas, pyrolysis temperature and input quantity were studied. And the compositions of the bio-oil were analyzed by GC-MS. The results show that the feed rate and carder gas flow rate have great influences on the pyrolysis by changing the reaction residence time of soybean oil. When the feed rate is 1.2 g/min and without the carder gas, the soybean oil can be fully cracked with the longer residence time. The gasification of the primary pyrolysis products is enhanced with the increasing of temperature, which leads to the yield, the content of oxygenated compounds and the acid value of bio-oil increase. With the increasing of input quantity, the yield of bio-oil is near 70% and keeps stable, but the decarboxylation effect decreases. The properties of bio- oil are improved and its component distribution is similar to the 0^# diesel after catalytic hydrogenation.