Alcohol Based Solvent Pulping

Alcohol based solvent pulping offers a potential advantage to traditional Kraft pulping in that it can produce high yield high quality pulps in shorter cooking times. The process also produces a sulfur- free lignin that is extracted at a much faster rate than the Kraft process. Wood chips and the ethanol- water solution is processed in a batch digester at 200°C and 392 psi. The combination of alcohol and high temperature releases about 75% of the lignin; most of the remaining lignin is removed with secondary extraction liquor and recycled alcohol-water. Steam stripping is used to recover residual alcohol from the pulp and lignin is recovered from the black liquor in a proprietary process. A drawback of this technology is the high cost of solvents that can be cost prohibitive (Kramer et al., 2009. p.36-37).

Development Status Products

Alcohol Based Solvent PulpingCosts & Benefits

Parent Process: Chemical Pulping
Energy Savings Potential

Additional fuel input amounts to 0.9 GJ/t pulp. Electricity savings are estimated to be 273 kWh/t (Kramer et al., 2009. p.37).

CO2 Emission Reduction Potential

A 142 ktonne test plant constructed in 1994 had the installation cost of $21.1/t paper (Kramer et al., 2009. p.37).

Alcohol Based Solvent Pulping Publications

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