Acid hydrolysis for production of nano lignin powder.

The present work refers to the production and characterization of nano lignin, when using acid hydrolysis in sawdust, sawmills generate this residue. Nanotechnology is advancing in many fields because of its great potential for new uses for nanometer-scale particles. Consequently, the renewable and biodegradable nature of lignin has aroused scientific and economic interest. The raw material of this study is sawdust of Eucalyptus sp. Firstly, acid hydrolysis was performed with 72% sulfuric acid in a 2:1 ratio. The material was homogenized for two hours and then stored at room temperature. Subsequently, to produce nano lignin, this material was processed in the Super Masscolloider Masuko Sangyo Microprocessor mill at concentrations of 1 and 2%. To obtain the nano lignin powder it was necessary to use the equipment called Spray Dryer, in which the material is sprayed into a chamber, ending with the recovery of the powder material. These nano powdered lignins were then characterized by analyzes of medium infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, x-ray diffraction, transmission, and scanning electron microscopy. The analyzes carried out showed intrinsic characteristics of the lignin in the two materials produced, which proves the efficiency of the acid hydrolysis carried out when obtaining lignin from sawdust. The efficiency of the mill's use for nanoscale material production was affirmed by microscopic characterization analyzes.

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