Abstract: The invention relates to a process for preparation, under reducing conditions, of cooking liquors having high sulphidity for sulphate pulp cooking, wherein the black liquor obtained in the cooking process is fed, after evaporation, completely or partly to a reactor operating at increased temperature which is obtained by energy supply from an external heat source and/or release of energy from the black liquor, a melt essentially consisting of sodium sulphide being formed and withdrawn to be further processed to cooking liquor. The process of the invention is characterized in that in addition there are fed to the reactor the whole or part of sulphur-containing and/or sulphur- and sodium-containing materials present in the pulp mill, including sulphur-containing and/or sodium- and sulphur-containing make-up chemicals used for the total chemicals balance of the pulp mill, in such a way that the mole ratio of sodium to sulphur in the total mixture fed to the reactor is within the range of 1.5 to 4.

Abstract: The invention relates to a process for the preparation of an essentially sulfide-free alkali liquor starting from a pulp mill alkali sulfide source, characterized by reacting in alkaline medium the alkali sulfice source with copper (II) oxide and/or copper (I) oxide, optionally with the addition of water, in a mole ratio oxide to sulfide (calculated as alkali sulfide) (charging) of at least 0.9 and allowing the mixture obtained to react at a temperature of from 30.degree. to 130.degree.0 C. to form hydroxide in an amount equivalent to the amount of sulfide and to precipitate a solid phase consisting essentially of copper (I) sulfide, copper (II) sulfide or a mixture thereof, whereupon the solid phase is separated in a way known per se to obtain an essentially sulfide-free alkali liquor, the reaction time of the precipitation reaction being adjusted with regard to the charging and temperature selected so that the residual concentration of copper ions in the final alkali liquor is below 1 mmole/l.

Abstract: A process is provided for the absorption of organic liquids, particularly oil, using hydrophobic fibrous material prepared by impregnating fibrous material comprising cellulose fibers with a liquid resinous material selected from the group consisting of acrylate prepolymers and polymers, alkyd prepolymers and polymers, and polyester prepolymers and polymers in an amount to provide in the impregnated fibrous material from about 0.5 to about 30% by weight polyacrylate, polyalkyd or polyester, and then heating the impregnated fibrous material to convert the polymer or prepolymer by chemical reaction into a hydrophobic polymer rendering the fibrous material hydrophobic.

Abstract: Compositions based on high molecular weight ethylene polymer made under low pressure conditions with supported chromium containing catalysts are stabilized against cross-linking during the compounding of such compositions by the use therein of certain phosphonic acids and the half esters of such acids.