Platinum-carbon catalyst and method for preparing tranexamic acid by using platinum-carbon catalyst

The invention discloses a platinum-carbon catalyst and a method for preparing tranexamic acid by using the platinum-carbon catalyst. The method comprises the following steps of firstly, preparing the platinum-carbon catalyst by using activated carbon, water, hydrochloric acid, chloroplatinic acid and ethylene glycol, then adding the prepared platinum-carbon catalyst, p-aminomethyl benzoic acid, pure water and concentrated sulfuric acid into a hydrogenation kettle for catalytic hydrogenation reaction to prepare tranexamic acid under the reaction conditions that the temperature is 20-25 DEG C, the pressure is 0.2 MPa and the reaction time is 1-1.5 h. The platinum content in the prepared platinum-carbon catalyst is 6.9%-12%, and when the platinum-carbon catalyst is used for preparing tranexamic acid, compared with p-aminomethylbenzoic acid, the feeding mass is lower, and the dosage of platinum metal in the catalytic hydrogenation reaction is reduced; and the catalytic hydrogenation reaction is carried out at roo