Other

Stephen R Winner

Raphael Katzen

Jairo H Lora

Malcolm Cronlund

Ron LeBlanc

Richard C Agar

Gopal C Goyal

Mikhail N Raskin

Chih Fae Wu

This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and recycled for reuse. This results in significant solvent and energy savings. Filtrates from the bleaching and delignification of the pulp are recycled for reuse in pulping, separation, and recovery of lignin and other by-products which results in significant energy savings and mitigation if not the elimination of pollution typically associated with bleaching. This invention also relates to products derived from the process and apparatus for carrying out the process. Lignins of various molecular weights and by-products of the pulping process are also recovered. The lignins are precipitated in high yields and at a high rate from a black liquor produced by pulping wood at high temperature and pressures. As a by-product of this process a purified furfural product is recovered. This furfural may be recycled for use in the recovery of the low molecular weight lignin of this process.

Method of recovering furfural from organic pulping liquor

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Boothwyn, PA, United States of America

Stephen R Winner