Abstract
AbstractCommercial methods for the production of naphthalene of crystallizing point 78° are investigated. Direct fractionation of the naphthalene oil fraction from a Wilton continuous still achieved some success, but the yield of the desired product was seriously reduced by the presence of as little as 1% of tar acids: direct fractionation of benzole rectification residues was not satisfactory. Fractionation methods have the disadvantage that the product has high sulphur content (at least 0·6%, compared with 0·4% for the product obtained by hot pressing). In the purification of naphthalene by crystallization, the formation of large crystals is necessary, and means for effecting this are discussed. Water‐washing on the centrifuge was selected for the final upgrading to a crystallization point of 78°.
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