Study on factors affecting catalytic pyrolysis and non-catalytic pyrolysis of spent fat oil

• 1、Mining Technology School，Liaoning Technical University,Huludao 125105
• 2、School of Civil and Architectural Engineering,Guilin Technical University,Guilin 541004

Abstract：A large amount of spent fat oil is produced every day throughout the country. If the spent fat oil is directly discharged into the sewer, it may cause sewer blockage and pollute the groundwater resources. If these spent fat oil is returned to the table, it will affect human health. In this paper, the effects of pyrolysis temperature, time and catalyst dosage on pyrolysis reaction were studied by experiments on catalytic pyrolysis and non-catalytic pyrolysis of spent fat oil. At the same time, tStudy on factors afStudy on factors affecting catalytic pyrolysis and non-catalytic pyrolysis of spent fat oilfecting catalytic pyrolysis and non-catalytic pyrolysis of spent fat oilhe chemical composition of the pyrolysis reaction products of different kinds of catalysts was also analyzed. At the end of the paper, the economic benefits of spent fat oil recovery by pyrolysis were evaluated. The experimental results show that it takes only 30 minutes to catalyze the pyrolysis of spent fat oil into flammable liquid and gas by using Portland cement clinker, white cement clinker and burnt brick powder as catalyst. Different from catalyst pyrolysis ,non-catalystic pyrolysis takes 60 minutes to pyrolyse the spent fat oil into flammable liquids and gases.White cement clinker and burnt brick powder act as a pyrolysis catalyst to facilitate the formation of gaseous products, while Portland cement clinker is beneficial to the formation of liquid products. The product of non-catalytic pyrolysis of spent fat oil contains only 3.527% of hydrocarbons, while the Portland cement catalytic pyrolysis product contains 35.893% of hydrocarbons; the catalytic pyrolysis of white cement clinker and burnt brick powder respectively yields 55.244 % and 67.844% of hydrocarbons. The non-catalytic pyrolysis product oil contains fatty acid，the Portland cement clinker and the brick-fired powder catalytic pyrolysis product oil all contain esters, and the white cement clinker catalytic pyrolysis product oil contains only fatty acids.

Keywords： Applied Chemistry Spent fat oil Catalytic pyrolysis；Cement clinker