Patent ID: 9580606
Date: 2017-02-28
CPC Classifications: C01B,C01P,C08K,C09C

Claim:
1. A method for recycling a scrap rubber, which method comprises the following steps: i) pyrolyzing a scrap rubber to obtain a char material; ii) milling the char material obtained in step i) to obtain a carbon black powder; characterized in that the pyrolysis in step i) comprises at least a two-stage pyrolysis process, wherein the said two-stage pyrolysis process comprises: a) a first pyrolysis stage to obtain an intermediate char material and b) a second pyrolysis stage to obtain a char material, characterized in that the first pyrolysis stage a) is carried out in a first rotary kiln and the second pyrolysis stage b) is carried out in a second rotary kiln, wherein the temperature during the first pyrolysis stage a) is between 630-670° C. and the temperature during the second pyrolysis stage b) is between 680-720° C., the temperature during the second pyrolysis stage b) being higher than the temperature during the first pyrolysis stage a), wherein the char material obtained from the second pyrolysis stage has a polyaromatic hydrocarbon (PAH) content less than 0.5 mg/kg.