Other

Repap Technologies Inc.

Malcolm Cronlund

Raphael Katzen

Jairo H Lora

William P Subsara

Gopal C Goyal

Chih F Wu

Ron LeBlanc

Richard C Agar

Mikhail N Raskin

Stephen R Winner

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

Coating compositions for ink jet printing, more specifically for the CB, CF and/or CFB sheets in carbonless copy paper. The compositions include a bivalent metal salt of a C.sub.12 to C.sub.24 alkyl acid, such as calcium stearate or zinc stearate, which has been found to significantly improve ink jet print quality.

Coating composition for ink jet printing

Lignin is precipitated in high yields and at high rates from a black liquor produced by pulping wood at high temperatures and pressures with an aqueous lower aliphatic alcohol solvent. The lignin is precipitated by diluting the black liquor with water and an acid to form a solution with a pH of less than about 3, an alcohol content of less than about 30% by volume and a temperature of less than about 75.degree. C. The precipitated lignin, when subsequently dried, is in the form of a powder which requires little or no crushing to convert it into a fine uniform size suitable for use without further significant processing.

Recovery of lignin

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Chester Springs, PA, United States of America

Malcolm Cronlund