31results about "Pulp deposit formation/corrosion prevention" patented technology

Methods for inhibiting the depositions of organic contaminants from pulp in pulp and papermaking systems are disclosed. Hydrophobically modified poly[ethylene glycol] are added to the pulp or applied to deposition-prone surfaces of a papermaking system.

Enzymatic methods are provided for determining the surface triglycerides content in a sample of wood pulp. The methods preferably comprise reacting triglycerides which are present on the surface of the wood pulp fibers in the sample in the presence of a lipase to form glycerol and fatty acids, and then determining the difference between the amount of free glycerol present in the sample and the amount of glycerol formed from said triglycerides. The method is useful as a quick, portable, accurate, and low cost assay for assessing the amount of triglycerides present at various sample points in pulp and paper mills, which advantageously serves as a diagnostic tool for use in controlling the undesirable deposition of pitch during the papermaking process.

There is provided a method of inhibiting the development of a biofilm adjacent a surface, the method comprising intermittently applying a biofilm inhibiting substance to a collection of microorganisms having biofilm developing potential. Other embodiments are also described.

A method for controlling the deposition of stickies in pulping and papermaking processes. The method comprises adding to fibre pulp or stock an additive comprising an organo-modified siloxane comprising units of the formula: [R<1>ZSiO<(4-a-b) / 2>]n in which each R<1> is independently selected from a hydrogen atom, an alkyl, aryl, alkenyl, aralkyl, alkaryl, alkoxy, alkanoyloxy, hydroxyl, ester or ether group, and each Z is independently selected from an alkyl group substituted with an amine, amide, carboxyl, ester, or epoxy group, or preferably at least one or more groups -R<2>-(OCpH<2p>)<q>(OC<r>H<2r>)<s>-R<3>, wherein the n is an integer greater than 1; the a and the b are independently 0, 1, 2 or 3; the R<2> is an alkylene group or a direct bond; the R<3> is a group as defined for the R<1> or the Z above; the p and the r are independently an integer from 1 to 6; the q and the s are independently 0 or an integer such that 1 <= q + s <= 400. Each molecule of the organo-modified siloxane contains at least one group Z. The organo-modified siloxane is preferably a hydroxyl- or alkyl- endcapped linear polydimethylsiloxane, in which 5 to 18 mole percents of silicon atoms are substituted by the Z groups of the formula -R<2>-(OCH<2p>)<q>(OC<r>H<2r>)<s>-R<3>, wherein the p is 2, the r is 3, the q and the s are independently 10 to 20, the R<2> is an alkylene group having from 1 to 6 carbon atoms or a direct bond, and the R<3> is a hydrogen atom or a hydroxyl, alkoxy, ester or ether group.

A method is provided for controlling deposit-forming contaminants that comprise pitch or other fiber components which can interfere with the processing of the fibers, reduce paper quality, or both in papermaking systems. The method includes contacting fibers with a lipase and at least one peroxide source-free oxidant, and optionally nonionic surfactant, to liberate the organic contaminants from the fibers. Paper products of the method are also provided.

A composition controlling deposition of an organic contaminant during pulp and paper making. Active ingredients thereof comprise: 1) a bio-enzyme having a perhydrolysis function; and ii) hydrogen peroxide and / or a precursor enabling generation of hydrogen peroxide. The part-by-weight ratio of i) to ii) in the composition is 1 : 0.1-200. Also provided is a paper making method in which the composition is added to a paper-making fiber slurry to control deposition of an organic contaminant.

The present invention relates to the technical field of household paper, in particular to a pulping process of high wet strength napkins, the process steps include long fiber pulping and short fiber pulping, long fiber refining and short fiber refining and pulping processes, In the pulping section, separate pulping of long and short fibers is used to improve fiber strength, and the concentration of long fiber pulp is controlled to 4.5-6%, and the concentration of short fiber pulp is 5-6%. This process adds certain amount of beating enzyme and liquid caustic soda; the conical refiner is used in the refining section to control the refining flow rate, refining power and beating concentration of long and short fibers respectively. The fiber beating concentration is 32-35°SR, and the resin control agent is added in the pipeline before the long and short fiber pulp enters the discharge pump; the present invention finally makes the prepared napkin It has high wet strength, excellent quality, and improves the operating efficiency of the paper machine, and the production operation is stable.

The invention relates to a method for controlling of a biofilm, for removing of a formed biofilm and / or for controlling a growth of microorganisms, preferably bacteria, in an aqueous environment of anindustrial manufacturing processcomprising cellulosic fibre material. A compound according to Formula I is administered to the aqueous environment of the process, in which Formula I R1, R2 and R3 independently represent a hydrogen atom; halogen atom; hydroxy group; amino group; alkylamino group, alkyl group, hydroxyalkyl group, haloalkyl group or alkoxy group having 1 to 4 carbon atoms; or an acylamido group having 1 to 10 carbon atoms; and A represents 2-thiazolamine; 2-propenenitrile; 2-propenoic acid; alkyl ester or hydroxyalkyl ester of 2-propenoic acid having 1 to 4 carbon atoms; or -CHCHCONR5R6 group, where R5 and R6 represent independently hydrogen atom, alkyl or hydroxyalkyl having 1 to 4 carbon atoms, with the proviso that the compound according to Formula I is not 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile or 4-amino-N-2-thiazolyl-benzene-sulphonamide.

Disclosed is a pitch control agent including a (meth)acrylamide-based amphoteric polymer. The (meth)acrylamide-based amphoteric polymer contains 50 mol % or more of (meth)acrylamide, 0.5 to 20 mol % of a diallyldialkylammonium salt; and 0.1 to 14 mol % of an anionic monomer, as copolymerizable monomer components. This pitch control agent is less likely to be affected by a change in a surrounding environment, and therefore can exhibit excellent pitch controllability under various environments in paper production process.

The present invention relates to a method for controlling biofilms to remove biofilms formed and / or to control the growth of microorganisms, preferably bacteria, in aqueous environments of industrial production processes comprising cellulosic fibrous material. Applying a compound according to formula I to the aqueous environment of the process, wherein R1, R2 and R3 of formula I independently represent a hydrogen atom; a halogen atom; a hydroxyl group; an amino group; or an amide group having 1 to 10 carbon atoms; and A represents 2-thiazolamine; 2-acrylonitrile; 2-acrylic acid; having 1 to 4 carbon atoms 2-Alkyl or hydroxyalkyl esters of acrylic acid; or -CHCHCONR5R6 groups, wherein R5 and R6 independently represent a hydrogen atom, an alkyl or hydroxyalkyl group having 1 to 4 carbon atoms, provided that a group according to formula I The compound is not 3-[(4-methylphenyl)sulfonyl]-2-acrylonitrile or 4-amino-N-2-thiazolyl-benzene-sulfonamide.

A method for inhibiting the formation, deposition and adhesion of calcium salt scale on metal surfaces or other surfaces of equipment, vessels and / or pipelines in a chemical pulping plant comprising adding an effective scale inhibiting amount of a composition to the in the alkaline aqueous mixture in the digester of the chemical pulping process described above. Said composition consists of at least one phosphonate component (I) and at least one component (II) consisting of at least one carboxylated fructan compound.

Disclosed is a pitch control agent including a (meth)acrylamide-based amphoteric polymer. The (meth)acrylamide-based amphoteric polymer contains 50 mol % or more of (meth)acrylamide, 0.5 to 20 mol % of a diallyldialkylammonium salt; and 0.1 to 14 mol % of an anionic monomer, as copolymerizable monomer components. This pitch control agent is less likely to be affected by a change in a surrounding environment, and therefore can exhibit excellent pitch controllability under various environments in paper production process.

The invention discloses an ozone bleaching device. The ozone bleaching device comprises a pulp draining machine, a pressure adjusting valve, an annular bearing table, a motor I, center pipe branch pipes, pulp hanging net films, a liquid level sensor, a constant pressure pump, an infrared moisture meter, a box body, a center pipe, a motor II, a pulp accumulating conical pond, and a universal shaft coupler. The ozone bleaching device disclosed by the invention integrates technologies of pulp hanging, pulp dehydrating, ozone bleaching, pulp washing and the like, so that technological processes are greatly shortened, and the production cost is reduced; the ozone bleaching device is simple in structure, high in operability, and good in bleaching effect; and through the adoption of the ozone bleaching device disclosed by the invention, the pulp with the maximum surface area can be obtained, and the pulp can be in sufficient contact with ozone, so that the bleaching efficiency is improved; and the ozone bleaching device disclosed by the invention is simple, economical, high-efficiency and energy-saving.

A method for processing of a lignocellulosic feedstock is provided comprising exposing lignocellulosic feedstock to acid in a reactor to hydrolyze at least hemicellulose present in said lignocellulosic feedstock, wherein during said exposing, a scale deposit comprising lignin forms on the inner surface of said reactor; and treating the scale deposit with an alkali solution at a temperature between about 140° C. and about 250° C. so as to remove scale. Also provided is a method for reducing scale deposit that forms on process equipment during a stage of reacting a lignocellulosic feedstock with acid.

Scale build-up on metal surfaces of a black liquor evaporator is prevented or mitigated by treating the black liquor with a deposit inhibiting concentration of a water-soluble polymer containing a polycarboxylate chain and a 3-mercaptopropionic acid end group.

The present invention relates to a method for controlling stickies deposition in pulping and papermaking processes, the method comprising adding to fibrous pulp or paper stock an additive comprising an organomodified siloxane, the organomodified siloxane Oxanes contain units of the formula: [R 1 a Z b SiO (4‑a‑b) / 2 ] n ; where each R 1 independently selected from a hydrogen atom, an alkyl group, an aryl group, an alkenyl group, an aralkyl group, an alkaryl group, an alkoxy group, an alkanoyloxy group, a hydroxyl group, an ester group or an ether group; each Z is independently selected from an amino group , amide, carboxyl, ester or epoxy substituted alkyl, or preferably at least one or more groups-R 2 -(OC p h 2p ) q (OC r h 2r ) s -R 3 ; wherein n is an integer greater than 1; a and b are independently 0, 1, 2 or 3; R 2 is an alkylene group or a direct bond; R 3 is the above for R 1 Or the group defined by Z; p and r are independently an integer of 1 to 6; q and s are independently 0 or 1 <q+s<400成立的整数；并且其中所述有机改性硅氧烷的各个分子含有至少一个基团z。所述有机改性硅氧烷优选是被羟基或烷基封端的线性聚二甲基硅氧烷，其中5～18摩尔％的硅原子被式‑r2‑(OC p h 2p ) q (OC r h 2r ) s -R 3 Z group substitution, wherein p is 2, r is 3, q ​​and s are independently 10 to 20, R 2 is an alkylene group or a direct bond having 1 to 6 carbon atoms, and R 3 It is a hydrogen atom or a hydroxyl group, an alkoxy group, an ester group or an ether group.