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Absorption of benzene vapour in shell resin and sea coal

Gases are released by binders when a mould or core is heated by molten metal. Previous work has studied the gases produced when mould binders are heated. To obtain a better understanding of the quantity and nature of the gases released, it is also necessary to determine whether gases are condensed or absorbed by the cooler portions of the mould. The pyrolysis products and the kinetics of pyrolysis of phenolic novolac resin are already known. Many of the major pyrolysis products that are hazardous air pollutants are aromatic compounds, including benzene. This study was conducted to correlate the absorption of benzene in two of the materials used in metal casting molds: sea coal and phenolic novolac resin. A correlation for the absorption of benzene in sea coal was developed. It was found that there was no absorption of benzene by phenolic novolac resin. Example calculations of the effect of the absorption and condensation on the products released from a metal casting mould using the data developed in this study are presented.