Abstract:
A method for alteration of the morphology of cellulose fibers, particularly softwood fibers, by (a) subjecting the fibers to a metal ion-activated peroxide treatment carried out at a pH of between about I and about 9, preferably between 3 and 7, and (b) subjecting the treated fibers to a refining treatment thereby converts SW fibers to HW-like fibers in many respects. The metal ion-activated peroxide treatment has been noted to act on pulp cellulose and hemi-cellulose, causing oxidation and oxidative degradation of cellulose fibers. The chemical treatment of the pulp, taken alone, is not sufficient to attain the desired modification of the morphology of the fibers, however, subsequent refining or like mechanical treatment of the chemically-treated fibers to achieve a given degree of refinement of the fibers requires dramatically less refining energy to achieve a desired end point of refinement and to impart other desirable properties to the pulp. A pulp of modified SW fibers and a mixture of HW fibers and modified HW fibers are disclosed.
Abstract:
The present invention relates to the use, as oxidation catalysts, of metal complex compounds having tetradentate ligands of formula (2) wherein all substitutents have the meanings as defined in Claim 1. The present invention relates also to formulations comprising such metal complex compounds, to novel metal complex compounds and to novel ligands.
Abstract:
The invention relates to a method for reducing the content of extractives of a high-yield pulp in a peroxide bleaching stage, said stage including peroxide bleaching and a subsequent dewatering or washing, said method comprising contacting the pulp in the peroxide bleaching with an organic stabilizer and in or after the peroxide bleaching with a surfactant, and thereafter subjecting the bleached pulp to said dewatering or washing for removing extractives along with the aqueous phase. The invention also relates to a method for producing bleached high-yield pulp.
Abstract:
Use of metal complex compounds of formula [LnMemXp]zYq (1), wherein Me is manganese, titanium, iron, cobalt, nickel or copper, X is a coordinating or bridging radical, n and m are each independently of the other an integer having a value of from 1 to 8, p is an integer having a value of from 0 to 32, z is the charge of the metal complex, Y is a counter-ion, q=z/(charge Y), and L is a ligand of formula wherein R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and R11, are each independently of the others hydrogen; unsubstituted or substituted C1-C18alkyl or aryl; cyano; halogen; nitro; —COOR12 or —SO3R12 wherein R12 is in each case hydrogen, a cation or unsubstituted or substituted C1-C18alkyl or aryl; —SR13, —SO2R13 or —OR13 wherein R13 is in each case hydrogen or unsubstituted or substituted C1-C18alkyl or aryl; —N(R13)—NR′13R″13 wherein R13, R′13 and R″13 are as defined above for R13; —NR14R15 or —N⊕R14R15R16 wherein R14, R15 and R16 are each independently of the other(s) hydrogen or unsubstituted or substituted C1-C18alkyl or aryl, or R14 and R15 together with the nitrogen atom bonding them form an unsubstituted or substituted 5-, 6- or 7-membered ring which may optionally contain further hetero atoms; with the proviso that R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and R11 are not simultaneously hydrogen, as catalysts for oxidation reactions, and the novel metal complex compounds of formula (1) and the novel ligands of formula (2).
Abstract:
It is intended to provide means of efficiently, economically and conveniently dyeing fibers or hair, bleaching pulp or fibers, removing phenol compounds from liquid wastes, degrading endocrine disruptors, producing phenolic resins, producing artificial lacquer coatings, improving wood qualities, etc. A culture of a strain belonging to the genus Flammulina; a culture originating in the above strain which is obtained by culturing the strain at a pH value exceeding 7 and has a phenol oxidase-like activity; a process for producing the culture; a dyeing method which comprises contacting a subject to be dyed with a dye in the presence of the above culture; and a dyeing composition containing the above culture.
Abstract:
There is provided a new and useful process for peroxide bleaching of mechanical or high yield pulp, the process comprising adding to a pulp slurry at least one stabilizer for stabilizing low valency states of transition metal ions in the slurry; subsequently adding caustic soda to said slurry simultaneously with or subsequent to adding said at least one stabilizer; adding hydrogen peroxide to the slurry at a preselected point; and subjecting the slurry to preselected conditions to complete the bleaching process.
Abstract:
A new enzyme-based process for oxidation and/or bleaching is described, comprising of oxidoreductases such as laccases and/or peroxidases—seperately or in combination—in the presence of their respective co-substrates like O2, air, H2O2, organic peroxides, peracids etc. and comprising of enhancer compounds from the class of oxocarbons, from the class of urazoles and hydrazides, from the class of hydantoins and the class of nitril (Cyan)-compounds, and comprising additionally of carbonyl compounds such as ketones, aldehyds, whereby the combination of enzyme, co-substrate, enhancer compound and carbonyl compound generate active oxygen species like dioxiranes, dioxetanes, peroxy-compounds etc. or form other reactive compounds or transition states like radicals (kation radicals, anion radicals) or reactive (red/ox-active) neutral compounds as oxidizing and/or bleaching agents.
Abstract translation:描述了用于氧化和/或漂白的新的基于酶的方法,其包含氧化还原酶如漆酶和/或过氧化物酶 - 单独或组合 - 在它们各自的共底物如O 2 ,空气,H 2 O 2 O 2,有机过氧化物,过酸等,并且包含来自类别的氧杂烃类的增强剂化合物,来自类别的吖唑和酰肼,来自类 的乙内酰脲类和腈类(氰基)化合物,并且还包括羰基化合物如酮,醛,由此酶,辅助底物,增强子化合物和羰基化合物的组合产生活性氧,如二氧杂环丁烷,二氧杂环丁烷,过氧化物 化合物等,或形成其它反应性化合物或过渡态,如自由基(起始自由基,阴离子自由基)或反应性(红/氧 - 活性)中性化合物作为氧化和/或漂白剂。
Abstract:
A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a peroxide, and at least one reaction catalyst selected from the group consisting of oxoacids of elements of Groups IV, V and VI and salts of these acids. Formation of organic chlorine compounds as by-products is suppressed by decreasing the amount of chlorine dioxide used in the ECF bleaching process in the first stage, and thus environmental toxicity in the waste water discharged from the bleaching process is decreased. Chemical pulp having a high degree of brightness is economically produced because increase in the production capacity is not required at all or suppressed to the minimum, and the investment cost is reduced to the minimum when the bleaching with chlorine in the first stage is converted into the bleaching with chlorine dioxide which is an ECF bleaching process.
Abstract:
Wood pulp is bleached using hydrogen peroxide as the oxidative bleaching agent in the presence of magnesium hydroxide or magnesium oxide. The bleaching process is carried out in the presence of magnesium hydroxide as the predominant, and preferably essential, source of alkali. The process optionally includes transition metal chelants, such as DTPA or EDTA in the bleaching slurry. The process eliminates the need for added caustic and silicate in such systems and can be carried out at or near neutral pH of 5.0 to 8.5.
Abstract:
An aqueous alkaline slurry of cellulose pulp is bleached with oxygen or peroxide by using a compound represented by general formula (1), (2) or (3) as a bleaching assistant: R1-O-null(C2H4O)m/(AO)nnull-Hnullnull(1)R2-O-null(C2H4O)m/(AO)pnull-(AO)q-Hnullnull(2)(R3)t-X-null(C2H4O)m/(AO)pnull-(AO)r-Hnullnull(3)where R1 stands for a branched alkyl group having 6 to 12 carbon atoms, m stands for an average added mor number of 4 to 15, A stands for a propylene, butylene or phenylethylene group, n stands for an average added mol number of 0 to 4, the addition shown in nullnull is in a random or block form, R2 stands for a linear or branched alkyl group having 6 to 12 carbon atoms, p stands for an average added mol number of 0 to 3.9, q stands for an average added mol number of 0.1 to 4, R3 stands for a hydrogen atom, a methyl or ethyl group, or a branched alkyl group having 3 to 12 carbon atoms, t stands for an integer of 1 to 5, X stands for a residual phenol group, and r stands for an average added mol number of from 0 to 4.