Abstract:

Ethylene tar char sulfonic acid was prepared by crosslinking and sulfonating method with the heavy components of ethylene tar after distillation as the raw material. The structure and properties of the catalyst were characterized by Flourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Raman spectroscopy, thermogravimetric analysis (TGA-DTG), and scanning electron microscopy (SEM). The results showed that the catalyst presented an amorphous graphite carbon structure and high acid content (4.20 mmol/g). The sulfonic acid functional group on the surface was the key active center. The catalyst was used for the dehydration of fructose into 5-hydroxymethylfurfural (5-HMF). At the reaction time of 140 min, temperatureat of 130 ℃, the catalyst dosage of 0.3 g, the solvent dosage of 8 mL and the additive dosage of 0.3 g, the conversion of fructose and the yield of 5-HMF were 96.2% and 52.1%, respectively. The purity of 5-HMF obtained by separation was 97.0%. The conversion of fructose and the yield of 5-HMF remained above 85.1% and 40.8% after the catalyst was recycled five times.

Key words: fructose, 5-hydroxymethylfurfural, ethylene tar, char sulfonic acid