▎ 摘　　要

NOVELTY - Preparing graphene from compressed carbon dioxide fluid comprises weighing graphite powder and surface active agent, and putting in a reaction kettle; to reach the temperature of the reaction kettle to the set value, compressing the carbon dioxide through the high pressure pump into the reaction kettle; and after the ultrasonic time reaches the set value, opening the valve to reaction pressure releasing to normal pressure, and taking out the sample obtained. USE - Method for preparing graphene from compressed CO2 fluid. ADVANTAGE - The method has moderate condition, short processing time, low pressure, high yield, and good quality, and is suitable for large scale production. DETAILED DESCRIPTION - Preparing graphene from compressed carbon dioxide (CO2) fluid comprises: (A) weighing graphite powder and surface active agent, and putting in a reaction kettle; (B) to reach the temperature of the reaction kettle to the set value, compressing the CO2 through the high pressure pump into the reaction kettle, where the compressed compression chamber volume fluid circulating time is 10-100 minutes, and the kettle pressure reaches the preset value, opening the ultrasonic device, and controlling the power in a certain range; and (C) after the ultrasonic time reaches the set value, opening the valve to reaction pressure releasing to normal pressure, and taking out the sample obtained.