氧化吸附法脱除燃油中苯并噻吩类硫化物

为深度脱除燃油中苯并噻吩类硫化物,采用质量分数69.8%浓硝酸作为催化剂和氧化剂,负载于硅胶吸附剂孔中制备成脱硫剂,在间歇反应器中,常温常压操作条件下处理质量分数1 000×10-6 4,6-二甲基二苯并噻吩(4,6-DMDBT)模型油.结果显示:脱硫剂在温度45 ℃,吸附剂与催化剂负载质量比1: 0.75,吸附剂与燃...

Desulfurization of dibenzothiophene in model fuels by oxidative adsorption method

An oxidative desulfurization adsorbent composed of mass fraction 69.8% nitric acid over silica gel was used to deeply remove dibenzothiophene from model diesel fuels.In the batch reactor,the model fuel containing mass fraction 1 000×10-6 4,6-dimethyldibenzothiophene(4,6-DMDBT) was stirred with the oxidative adsorbent at mild temperature under atmospheric pressure.The results show that the sulfur-free fuels are obtained in 90 min at 45 ℃ when the mass ratio of adsorbent to catalyst and fuel equals to 1 ∶0.75 and 1 ∶30,respectively.The aromatic hydrocarbon hardly has effect on the desulfurization rate.However,the reaction rate decreases dramatically in the water saturated fuel.The desulfurization capacity of regenerated adsorbent is almost totally recovered.Because the desulfurization reaction occurs in the pores of the adsorbent,the model fuel after desulfurization can meet the national corrosion test in China.