Manufacturing Process of Activated Carbon from Asphalt (XIV)

This report describes the results of char production with a midget plant which has a reactor with diameter of 350mm and volume of 70 liter.The optimum pretreatment conditions of asphalt were as follows; pretreatment reagent (60%-oleum): 1. 5 times of asphalt by weight, solvent (1, 1, 2-trichloroethane): 10 times of asphalt by weight, dropping period of pretreament reagent: 20 min, reaction period: 60 min, reaction temperature: 100°C and stirring rate: 200 r. p.m.The char, its bulk density being ca. 0.65 g/ml, was obtained with yield of 120-30 wt % under these coditions. And ca. 75 wt % of char obtained was granulated char which sieved into 4-32 mesh range.When char was activated by steam at 850°C for 30 min, the activated carbon, which has specific surface area of 1000-1300 m2/g and methylene blue adsorbability of 230-300 mg/g, was obtained with yield of ca. 30 wt % based on asphalt.Also, both the char production, using the midget plant, from asphalt and powdered char sieved under 32 mesh as raw materials, and the char production by sulfuric anhydride as pretreatment reagent reproduced the results of laboratory-acale experiment well.