31results about "Pulping foam prevention" patented technology

A recycled cellulose pulp composition is provided which comprises recycled cellulosic fibers and cellulose ester staple fibers. The recycled cellulose pulp containing co-refined re-cycled cellulose fibers and cellulose ester staple fibers can be added to a hydropulper and fed back through a refiner to make wet laid products.

The present invention provides for a composition comprising a silane having the formula:(R1)(R2)(R3)Si—R4—Si(R5)(R6)(R7)whereinR1, R2, R3, R5, and R6 are each independently selected from the group consisting of 1 to 6 monovalent hydrocarbon radicals, aryl, and a hydrocarbon group of 7 to 10 carbons containing an aryl group;R4 is a hydrocarbon group of 1 to 3 carbons;R7 comprises an anionic, cationic or zwitterionic substituent. The silanes of the present invention exhibit resistance to hydrolysis over a wide pH range.

Superior defoamer compositions contain a low viscosity linear organopolysiloxane, a higher viscosity, optionally branched organopolysiloxane, a polyethersiloxane with a low cloud point, and both colloidal silica and fumed silica.

(A) Siloxane-based antifoams and(B) silicone polyethers prepared by reacting organopolysiloxanes (1) containing 0.05% to 1.6% by weight of Si-bonded hydrogen atomswith unsaturated polyethers (3) of the formulae:CH2═CR1—(CH2)aO(C2H4O)bR1  (Ia)CH2═CR1—(CH2)aO(C2H4O)b(C3H6O)cR1  (Ib)CH2═CR1—(CH2)aO(C3H6O)cR1  (Ic),whereR1 is a hydrogen or a C1-6 hydrocarbon radical,a is 0 to 16,b is 1 to 50, andc is 1 to 50,wherein the sum b+c is ≧10 and at least two different polyethers (Ia), (Ib) and (Ic) are used, andoptionally further reacting the reaction productwith organopolysiloxanes (2) containing from 0.01% to 0.5% by weight of Si-bonded hydrogen atoms,wherein the first and second step reactions take place with a hydrosilylation catalyst, and the weight ratio of Si-bonded hydrogen in organopolysiloxane (1) to Si-bonded hydrogen in organopolysiloxane (2) is at least 1.5.

A defoamer made from a composition that has at least one triglyceride oil or triglyceride oil mixture, at least one silicone, at least one silicone-triglyceride stabilizing agent, hydrophobic silica particles, optionally one or more surfactants and / or dispersants, and optionally one or more thickeners, and optionally one or more biocides. The defoamers described herein have utility in controlling foam in industrial applications. Typically, the defoamer can be used to control foam in pulp and paper applications.

Efficient deaeration of aqueous suspensions such as those obtained during textile treatment or pulp and paper production is achieved by use of a combination of a polyoxypropylene polyether polymer or copolymer and branched polyether-polysiloxane copolymers.

The invention discloses a method for dispersing a higher fatty alcohol mixture, which provides a method for dispersing a mixture of natural fatty alcohol and synthol into water, and belongs to the technical field of fine chemical preparations. A higher fatty alcohol emulsion prepared by the method contains the following components: (1) 1 to 30 percent of synthesized higher fatty alcohol with carbon number of between 14 and 30; (2) 1 to 15 percent of C12-18 saturated natural higher fatty alcohol; (3) 1 to 15 percent of paraffin; (4) 0.1 to 5 percent of non-ionic surfactant with MO(EO)m(PO)nH as a general formula; (5) 0.1 to 5 percent of one or more anionic surfactants selected from sulfonated ricinate, sulfonated fatty glyceride, alkyl sulfate, alkoxy sulfate, alkylaryl sulfonate and sodium polyoxyethylene alkyl ether sulfate; (6) 0.1 to 5 percent of thickening agent; and (7) 60 to 95 percent of dispersant (water), wherein M is an initiator group of the non-ionic surfactant, alkyl or an benzene ring. The method comprises the following realization steps that: (1) the synthesized higher fatty alcohol, the natural higher fatty alcohol, the paraffin, the non-ionic surfactant, and the anionic surfactants are mixed according to the proportion, and then the temperature is increased to be between 80 and 95 DEG C; (2) then the water with a temperature of between 60 and 80 DEG C is slowly added into the mixture to begin to emulsify, and the emulsification temperature is kept higher than 60 DEG C during the emulsification; (3) the obtained product passes through a colloid mill after the adding of hot water; and (4) finally the obtained product is cooled to be between 30 and 40 DEG C, then the thickening agent is added into the obtained product to be mixed evenly, thus the higher fatty alcohol emulsion is obtained.

A method for producing a solid antifoaming agent comprising the following steps: providing an alkaline solution; adding an oil to the above alkaline solution to produce a saponification reaction; adding a liquid antifoaming agent; and putting aside the mixture containing the above alkaline solution, the oil and the liquid antifoaming agent to form the solid antifoaming agent. The ingredients of the solid antifoaming agent according to the present invention include 5˜40 weight percent vegetable oil, a 20˜40 weight percent sodium hydroxide solution and a 30˜60 weight percent liquid antifoaming agent.

An anti-foaming agent containing (A) an organopolysiloxane and a finely powdered inorganic filler, (B) a polyoxyalkylene group-containing branched chain organopolysiloxane, and (C) an anionic surfactant. This anti-foaming agent exhibits stable anti-foaming performance even at high temperatures that reach, for example, 80QC or under strongly alkaline conditions and produces no aggregates.

Disclosed herein are methods of defoaming industrial process streams, the methods comprising adding to the industrial process stream an emulsion stabilized by Janus particles, wherein the Janus particles comprise at least one hydrophobic surface and at least one hydrophilic surface, and wherein the emulsion comprises silicone emulsion droplets in a continuous aqueous phase. Also disclosed herein are defoamer compositions comprising Janus particles and methods of making such compositions.

Efficient deaeration of aqueous suspensions such as those obtained during textile treatment or pulp and paper production is achieved by use of a combination of a polyoxypropylene polyether polymer or copolymer and branched polyether-polysiloxane copolymers.

Defoamer compositions containing a plurality of defined organopolysiloxanes exhibit very short initial foam collapse and yet exhibit long lasting defoaming activity when added to aqueous media prone to foaming.

A recycled cellulose pulp composition is provided which comprises recycled cellulosic fibers and cellulose ester staple fibers. The recycled cellulose pulp containing co-refined re-cycled cellulose fibers and cellulose ester staple fibers can be added to a hydropulper and fed back through a refiner to make wet laid products.

The invention provides a method of improving the digestion of wood chips into pulp. The method involves: adding a cross-linked glycerol-based polymer additive to a solution used in the digestion process. This additive is unexpectedly effective at facilitating digestion. The branched and ether structure of the additive allows it to withstand the harsh nature of a high stress environment. In addition, it is more soluble in the harsh condition than other surfactants. The structure, resistance, and particular balance between hydrophobic and hydrophilic regions, causes the additive to increases the interaction between the wood chips and the digestion chemicals. This in turn reduces the costs, the amount of additive needed, and the amount of reject wood chunks that result from the digestion process.

The present invention provides for a composition comprising a silane having the formula:(R1)(R2)(R3)Si—R4—Si(R5)(R6)(R7)whereinR1, R2, R3, R5, and R6 are each independently selected from the group consisting of 1 to 6 monovalent hydrocarbon radicals, aryl, and a hydrocarbon group of 7 to 10 carbons containing an aryl group;R4 is a hydrocarbon group of 1 to 3 carbons;R7 comprises an anionic, cationic or zwitterionic substituent. The silanes of the present invention exhibit resistance to hydrolysis over a wide pH range.

The invention belongs to the fields of biochemical pulping and papermaking, and discloses an additive for physical straw pulping and a use method thereof. The additive for physical straw pulping comprises dimethylsilicone fluid, a fabric softening dispersion agent, sodium lauryl sulfate, formamide, a low-temperature defoaming agent TF-508C and water. After being diluted with water for 4 to 20 times, the additive is added uniformly in a pulping process by a spray device controlled through an electric pump, and the spraying frequency ranges from 2 to 20 L / H, preferably 8 to 20 L / H. The additive for physical straw pulping and the use method thereof realize the technical support of environment-friendly physical straw pulping, a spraying infiltration method is adopted to replace a traditional soaking boiling method, and therefore, the possibility of pollution is low. Environment-friendly production of the physical straw pulping is realized, and the additive used for performing spraying infiltration on straw can be reused. No pollution is caused in the whole pulping process, so that the zero pollution discharge in the papermaking production is realized.

The invention relates to new defoaming formulations containing: (1) organopolysiloxanes containing, per molecule, at least one structural unit of general formula O1 / 2R2Si-Y-SiRO2 / 2 (I) and at least two units of general formula R1R2SiO1 / 2 (II) and units of general formula R2SiO2 / 2 (III), wherein R, R1 and Y have the meaning provided for them in claim 1, provided that the organopolysiloxane containsa structural element of formula R2Y2SiO-(SiR2O)x1-SiRY1O-(SiR2O)x2-SiR2R1 (IV), wherein Y1 and Y2 have the meaning provided for them in claim 1, and x1 and x2 are equal to 0 or are a whole number, provided that the sum is x1+x2=x, wherein, on average, x is greater than 5 and smaller than 100; (2) filling materials; (3) organopolysiloxane resins formed by units of general formula R2 e(R3O) fSiO(4-e-f) / 2 (V), wherein R2, R3, e and f have the meaning provided for them in claim 1; (4) silanol-containing organopolysiloxanes of general formula XSiR4 2O- (SiR4 2O)n-SiR4 2X (VI), wherein R4 and n have the meaning provided for them in claim 1, X represents a hydrogen atom, an optionally substituted C1-C18-hydrocarbon group, a C1-C18-alkoxy group or a hydroxy group -OH, provided that, on average, 30 to 60 mol%, preferably 50 mol%, of the groups X correspond with hydroxy groups -OH; and (5) inorganic or organic acids.