Experimental Research On Methanol To Hydrocarbon Fuels

With the rapid development of Chinese automobile industry, the demand of liquid fuels surges, which even leads to gasoline crisis in some places. On the other hand, methanol production excesses currently, it is necessary for the competitive enterprises to change the growth mode of methanol economics, develop downstream methanol products and adjust product component."methanol3M technologies", methanol to olefin (MTO), methanol to propylene(MTP) and methanol to gasoline(MTG) will be a promising alternative for future methanol application."3M technologies" not only resolve the problem of methanol surplus but also release the contradiction of energy shortage.Methanol to hydrocarbon fuel was researched on a fixed-bed reactor device. The effect of reaction conditions on the performance of MTG and the recycle of some typical reaction exhaust gas were investigated. The composition of gas products were analyzed by online gas chromatography (GC), and the composition of liquid products were analyzed by gas chromatography-mass spectrometry(GC-MS) and GC.Methanol conversion, oil yield, gas yield were calculated according to the results.It was show that the best condition of this fixed-bed reactor is400℃and2Mpa. Reaction temperature and pressure have a significant impact on methanol conversion. Methanol conversion is close to100%at the temperature of400℃. Under the condition of atmosphere pressure, ethylene and propylene have considerable content in gas product.Their contents are account for more than50%in total gas product. With pressure increase, olefins with lower C number decrease obviously and aromatization reactions intensify. The content of methane and propane in gas composition increases clearly. Under the condition of temperature400℃, maximum oil yieldand minimumgas yield was obtained.. The product with highest content of oil is aromatic.At the best experiment condition, Different Si/Al HZSM-5catalysts were studied. Because the low Si/Al ratio has strong acidity, it leads to high oil yield. Catalyst with certain diluent quartz was in favor of improving catalyst life. Exhausted gas of DME amd ethylene was studied for recycling. Higher DME partial pressure can promote oil production with high content of aromatic. Meanwhile, low content of methane can be obtained under the identical condition. Ethylene which can be made good used through exhausted gas recycle can also be catalyzed to oil. Oil production is similar to that produced from methanol. Methane content in gas composition is low. After several times exhausted gas recycle, methane and propane can be collected as gas of high caloric value.