Production of fine chemicals by integrated photocatalytical degradation of alkali lignin solution in corrugated plate reactor and cyclic extraction technology

Abstract

This paper presented a procedure which includes the photocatalytical degradation of alkali lignin solution in corrugated plate reactor and the recovery of degraded products in organic solvent with cyclic extraction. It was prepared a Fe–TiO2 thin film photocatalyst by dip-coating method successfully immobilized on the surface of copper corrugated plate. Lignin was dissolved in sodium hydroxide (0.5mol/L) solution and the concentration of lignin solution in range of 10–40g/L. Lignin was degraded on the surface of catalyst and over irradiation by ultraviolet (UV) lamp (power-21W with wavelength of 254nm). By GC–MS analysis, it confirmed that there were more than 20 kinds of compounds in degradation products of alkali lignin. In addition to this, some commercial value chemicals including 2,6-bis(1,1-dimethylethyl)-4-methylphenol (BHT), dibutyl phthalate (DBP) and diisobutyl phthalate (DIBP) were also observed.