Catalytic pyrolysis for the production of liquids and gases from acidic precipated of black liquor was carried out by using CaO and CuCO3.Cu(OH)2 catalysts. This process has been studied in the temperature range from 463 to 570 K. Pyrolysis of black liquor in the temperature range 463-570 K gave yields which increased from 25.9 to 29.0% as the catalyst percentages was increased from 5 to 20% for CaO. Under the same conditions, the yields of pyrolysis increased from 25.5 to 28.3 for CuCO3.Cu(OH)2.