Process of purifying wood pulp with caustic-borate solution and recovering the purifying chemical
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United States of America Patent
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Dec 21, 2010
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Nov 9, 2006
filing date -
Nov 9, 2006
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Abstract
Systems and methods for purifying wood pulp by caustic-borate extraction. The systems and method include a method for recovering both the caustic and borate compounds from the resultant hemicaustic effluent, so that they may be recycled and re-used. Efficient recovery of these components is enabled by a nanofiltration system that has one or more alkali-resistant nanofiltration membranes.
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