Abstract:

Using the staged conversion strategy, the lignin component in furfural residue(FR) was first prepared into lignin-based dispersant(LS). When the mass of FR was 100 g, the mass of the deionized water was 1 000 g, the reaction temperature was 70℃, the reaction time was 3 h, the dosage of sodium hydroxide was 6.5 g, sodium sulfite dosage was 1.6 g, and formaldehyde dosage was 0.2 g, the dispersing force of LS was 105%. Subsequently, water absorption resin was further prepared from the separated cellulose residue. The effects of the reaction temperature, the amount of initiator ammonium sulfate(APS), crosslinking agent N, N'-methylene bisacrylamide(MBA) and the total amount of complex monomer acrylic acid(AA) and acrylamide(AM) on the water absorption of the water-absorbing resin were investigated. Under the optimum conditions of the neutralization degree of acrylic acid of 60%, the initiation time of 0.5 h, the amount of complex monomer of 9 g, the amount of initiator of 1.3 g, crosslinking agent dosage of 0.05 g, the reaction temperature of 52℃, and the graft copolymerization reaction time of 3 h, the water absorption of the water absorbent resin reached 64.6 g/g. FT-IR analysis showed that the grafting reaction of AM, AA and cellulose residue occurred. SEM images showed that theproduct with cross-linked network structure was formed in the reaction; thermogravimetric analysis showed that the introduction of AA and AM improved the thermal stability of the water absorbent resin; XRD revealed that the grafting reaction of AA and AM took place on the skeleton of cellulose residue.

Key words: furfural residue, staged conversion, dispersant, water absorption resin