METHOD OF PRODUCING NATURAL THERMOPLASTIC POLYMER (VERSIONS) Russian patent published in 2014 - IPC C08H7/00 C07G1/00 

FIELD: chemistry.

SUBSTANCE: when implementing the method (version 1), the starting material used is hydrotropic lignin obtained from silver grass, which is mixed with water. Hydrolysis is carried out at atmospheric pressure. The mixture is heated to water boiling point and held for 5-60 minutes. After holding, the solid phase is then collected, dried and treated with acetone at room temperature. The solid phase is then separated. Acetone is then removed from the filtrate at room temperature to obtain a thermoplastic polymer. When implementing the method (version 2), the starting material used is crushed silver grass, which is mixed with water. Hydrolysis is carried out at high pressure. The mixture is heated to temperature of 180-190°C and held for 5-60 minutes. After holding, the reaction mixture is cooled to room temperature. The solid phase is collected, washed with water until the rinse water becomes clear, dried at temperature of 100-110°C and then treated with acetone while boiling for 30-60 minutes. The solid phase is then separated. Acetone is then removed from the filtrate at room temperature. The obtained intermediate product is treated with acetone at room temperature. The solid phase is separated. Acetone is removed from the filtrate at room temperature to obtain a thermoplastic polymer.

EFFECT: each version of the invention improves environmental safety, technological expediency and operational properties of the method of producing an end product which is soluble in an organic solvent and has a low melting point.

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