The aim of this study is to obtain pyrolysis products (solid, liquid, and gas) from black locust (Robinia pseudoacacia) in the presence of perlite. These include oil, water-soluble products, char, permanent gases, and C1-C4 hydrocarbon gases. The yields of liquid products increase with increasing temperature and perlite. The highest yield of liquid products was 61.9%, which can be obtained from the pyrolysis with 10.0% perlite. The yields of liquid products sharply increase between 3.5 and 6.5min with 2.5% perlite run, whereas 3 and 7min with 10.0% run. Then the yields approach the plateau value after 11 min for all runs. The influence of residence time on the yield of products is small, with a slight decrease in oil yield and increase in char yield. Charcoal yields from 2.5% perlite run were 64.9 and 30.5% for 5 and 20min, respectively.