32results about "Pulp deposit formation/corrosion prevention" patented technology

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. There is also provided a method of inhibiting the development of a biofilm adjacent a surface, the method comprising inhibiting the biofilm developing potential of a collection of microorganisms without completely eradicating said collection of microorganisms. Also provided are a system for inhibiting the development of a biofilm, and a method and system for inhibiting the production of an enzyme by a collection of microorganisms.

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.

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.

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.

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.

The invention discloses a composition for controlling organic pollutant sedimentation during pulping and papermaking production and a papermaking method. Effective ingredients of the composition include a bio-enzyme with a peroxide hydrolyzing function and a precursor of hydrogen peroxide and / or a precursor capable of generating hydrogen peroxide, wherein the weight ratio of the bio-enzyme to the precursor in the composition is 1:(0.1-200). The papermaking method comprises the steps that hydrous fiber papermaking pulp is formed; after the composition is added into the fiber papermaking pulp for a reaction, the obtained pulp is conveyed onto a net, water is drained, and paper sheets are formed; the paper sheets are squeezed and dried to obtain paper products. Through the composition, glue and especially sedimentation of viscous matter during pulping and papermaking production can be remarkably controlled, negative effects and harm possibly brought by the glue to papermaking are reduced, papermaking production efficiency and product quality are improved, energy consumption is lowered, production cost is saved for papermaking enterprises, economic profits are increased, and the application range is wide.

A method for inhibiting the formation, deposition and adherence of calcium salt scale to metallic and other surfaces in the equipment, vessels and / or piping of a chemical pulp process facility comprising adding an effective scale inhibiting amount of a composition to the alkaline aqueous mixture in the digester of said chemical pulping process. Said composition consists of at least one phosphonate component (I) and at least one component (II) consisting of at least one carboxylated fructan compound.

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.

The invention relates to the technical field of living paper and particularly relates to a pulping process of high wetting strength napkin paper. The process comprises procedures of long fiber crushing, short fiber crushing, long fiber grinding, short fiber grinding, and slurry blending. Long fibers and short fibers are separately and respectively crushed in the crushing procedures, so that the fiber strength can be improved; in addition, the concentration of the crushed long fiber slurry is controlled as 4.5-6%, the concentration of the crushed short fiber slurry is controlled as 5-6%, and acertain amount of pulping enzymes and liquid caustic soda are used in the process; in the grinding procedures, a conical grinding machine is used, grinding flows, grinding power and pulping concentrations of the long fibers and the short fibers are respectively controlled, the pulping concentration of the long fibers is 28-32 degree SR, the pulping concentration of the short fibers is 32-35 degreeSR, and a resin control agent is put into a pipeline before the long and short fiber slurry is fed into an unloading pump. Due to process optimization and synergetic effects of the procedures, the finally prepared napkin paper has high wetting strength, is excellent in quality, high in paper machine operation efficiency and stable in production operation.

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.

The present invention relates to a method for predicting the microbial status of a paper or board making process and / or quality of the dry board or paper obtained from said process and to a method forcontrolling microbial status of a paper or board making process or quality of the dry board or paper obtained from said process. Surface level and duration of time in at least one storage tower or pulper are monitored and correlated with respective predetermined values for said tower or pulper in order to predict the risk of microbial activity.

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.

Compositions and methods for cleaning wet strength resin contamination from papermaking equipment and / or for preventing wet strength resins from contaminating papermaking equipment using the compositions are disclosed. The compositions comprise an aqueous solution of a weak organic acid; a surfactant, preferably a nonionic surfactant, a divalent metal ion containing catalyst and optionally a glycol ether containing solvent.

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.

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.

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.

Disclosed is a method for controlling a biofilm, for removing a formed biofilm and / or for controlling a growth of microorganisms, preferably bacteria, in an aqueous environment of an industrial manufacturing process including cellulosic fibre material. In the method, a composition including a compound selected from a group consisting of 3-[(4-methylphenyl)sulphonyl]-2-propenenitrile and 4-amino-N-2-thiazolyl-benzenesulphonamide is administered to the aqueous environment of the 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.