Alutal Measure & Trust

Pulpa & PapelTurpentine Recovery

Turpentine Recovery

Vapors from the digester contain turpentine and 85% of it is released during the relief cycle. Recovery of this volatile organic compound (VOC) is undertaken for environmental reasons, to lessen effluent treatment of condensate, to utilize turpentine as a fuel source, or to sell it as a by-product to chemical processors.

Challenge

Two vessels in a typical recovery system require level control of the turpentine/ water interface: the decanter, or separator, and the storage tank. The National Fire Protection Association (NFPA) rates turpentine as a «severe fire hazard.» For this reason, the decanter is contained in a dyked area, storage tanks are sometimes located below ground, and controls must be rated explosion-proof.

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