Effects of potassium salt on the pyrolysis products characteristics of alkali lignin from furfural residue

Abstract

There have been few investigations on the pyrolysis characteristics of furfural residue lignin in general. The effects of reaction temperature and potassium salt on the pyrolysis products of furfural residue alkali lignin were explored as a result. The char yield reduced as the pyrolysis temperature increased, whereas the gas yield increased. At 500 °C, the highest bio-oil yield was 20.88 %. The three additives then had a pattern of increasing char and gas yield while decreasing bio-oil yield. K2CO3 was shown to be the greatest representation of the influence of potassium salt, with a demethylation ability that was 57.00 % greater than the other two additives. Potassium chloride, on the other hand, caused alkali lignin to create a larger amount of guaiacol. In biochar, CH3COOK had a good fusion effect. The effect of potassium salt additions on solid products was primarily to accelerate the condensation and cyclization of the benzene ring in char, hence increasing char yield, with little influence on gas. The cogeneration effect of various potassium salt additives on pyrolysis products was investigated, and a potential catalytic mechanism was proposed, providing a useful theoretical foundation for the high-value exploitation of furfural waste.