Described is a method of kraft pulping in which a phenolic compound is added to the cooking step. The phenolic compound is added at a time point between about 5 minutes and about 120 minutes prior to completion of the cooking step. The presence of the phenolic compound increases the extent of delignification in the cooking step.

The purpose of the present invention is to provide: a container in which a cellulose resin composition can be stored without discoloring with the lapse of time; a package comprising a cellulose resin composition and the container; a method in which a cellulose resin composition is inhibited from discoloring by using the container; and a method for producing a molded resin object, the method including using the container. The container, which is for containing a cellulose resin composition comprising a thermoplastic resin and cellulose, includes a high-lignin-content member, which has a lignin content of 10 mass % or higher, and a low-lignin-content member, which has a lignin content of 1 mass % or less, and has a surface to be in contact with the cellulose resin composition, the whole of the surface being constituted of the low-lignin-content member.

The purpose of the present invention is to provide: a container in which a cellulose resin composition can be stored without discoloring with the lapse of time; a package comprising a cellulose resin composition and the container; a method in which a cellulose resin composition is inhibited from discoloring by using the container; and a method for producing a molded resin object, the method including using the container. The container, which is for containing a cellulose resin composition comprising a thermoplastic resin and cellulose, includes a high-lignin-content member, which has a lignin content of 10 mass % or higher, and a low-lignin-content member, which has a lignin content of 1 mass % or less, and has a surface to be in contact with the cellulose resin composition, the whole of the surface being constituted of the low-lignin-content member.

An aqueous composition comprising: sulfuric acid; an alkanesulfonic acid; and a peroxide. Said composition being capable of delignifying biomass under milder conditions than conditions under which kraft pulping takes place.

An aqueous composition comprising: sulfuric acid; a substituted aromatic compound; and a peroxide. Said composition being capable of delignifying biomass under milder conditions than conditions under which kraft pulping takes place.

An aqueous composition comprising: sulfuric acid; a heterocyclic compound; an alkanesulfonic acid; and a peroxide. Said composition being capable of delignifying biomass under milder conditions than conditions under which kraft pulping takes place.

An aqueous composition comprising: sulfuric acid; a modifying agent comprising an arylsulfonic acid; and a peroxide. Said composition being capable of delignifying biomass under milder conditions than conditions under which kraft pulping takes place.

An aqueous composition comprising: sulfuric acid; a modifying agent comprising a carbonyl-containing nitrogenous base compound; and a peroxide. Said composition being capable of delignifying biomass under milder conditions than conditions under which kraft pulping takes place.

An aqueous composition comprising: sulfuric acid; a heterocyclic compound; and a peroxide. Said composition being capable of delignifying biomass under milder conditions than conditions under which kraft pulping takes place.

The invention relates to a process for treating vapours released from lignocellulose biomass during acid treatment at elevated temperature of the lignocellulose biomass. The process comprises condensing (3) the vapours to produce a condensate, adjusting (4) the pH of the condensate to about 9, and decanting (5) the condensate to produce turpentine, and may further comprise distilling (6) the mixture remaining after decanting to produce furfuraland a reject comprising tall oil fatty acids. The invention also relates to a corresponding system for treating vapours released from lignocellulose biomass during acid treatment at elevated temperature of the lignocellulose biomass.