Provided is a method for operating a direct cooling water system capable of efficiently separating oil content and suspended matter from direct cooling water that contains oil and metal scale, such as an iron oxide and iron, and of easily recovering the oil content. The method for operating a direct cooling water system that contains oil and metal scale comprises: causing an oil content separation promoter to be present in wastewater of the direct cooling water system, in a path of turbulent flow from a scale sluice to a scale pit; removing separated floating oil content in a cross-flow settling tank downstream of the scale pit; and recovering and cooling the wastewater from which the oil content was removed in the cross-flow settling tank, and using said wastewater once again as direct cooling water. The cross-flow settling tank is provided with a partitioning weir, and the partitioning weir is disposed inside the cross-flow settling tank with the upper end thereof protruding from the water surface and the lower end thereof being spaced apart from the bottom surface of the cross-flow settling tank, and is provided at a position up to a prescribed depth from the water surface. Flow of the floating oil content is dammed by the partitioning weir, and cooling water wastewater, from which the oil content was separated, is caused to pass between the bottom surface of the cross-flow settling tank and below the lower end of the partitioning weir.
B21B 9/00 - Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
B22D 11/124 - Accessories for subsequent treating or working cast stock in situ for cooling
C02F 1/40 - Devices for separating or removing fatty or oily substances or similar floating material
2.
METHOD FOR PREVENTING FOULING OF HEAT EXCHANGER IN PETROLEUM PROCESS
Provided is a novel method which enables the highly efficient prevention of the fouling of a heat exchanger in a petroleum process. In one aspect, a method for preventing the fouling of a heat exchanger in a petroleum process using a fouling inhibitor is provided, the fouling preventing method comprising: adding a fouling inhibitor comprising a phosphite ester compound and a succinic acid imide compound to a process fluid when the H/C atom ratio in dirt in the heat exchanger is more than 1.3, and adding a fouling inhibitor comprising a phosphite ester compound and a succinate ester compound to the process fluid when the H/C atom ratio in the dirt in the heat exchanger is 1.3 or less; and feeding the process fluid containing the fouling inhibitor to the heat exchanger.
C10G 7/10 - Inhibiting corrosion during distillation
C10G 75/04 - Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of antifouling agents
3.
METHOD FOR PREVENTING HEAT EXCHANGER FOULING IN OIL PROCESS
Provided is a novel method enabling an efficient prevention of heat exchanger fouling in an oil process. In one embodiment, the invention relates to a method for preventing heat exchanger fouling in an oil process. The fouling prevention method comprises: first processing whereby a process fluid, which has been added with a chemical agent containing at least one among a phosphate ester compound and a phosphite ester compound that are soluble in oil, is sent in the form of a liquid to a heat exchanger from which adherent fouling has been cleaned; and second processing whereby a process fluid, which has been added with a chemical agent containing a dispersant, is sent in the form of a liquid to the heat exchanger that has undergone the first processing. In the first processing, the chemical agent is added to the process fluid in such a manner that the chemical agent active ingredient concentration (ppm) in the process fluid of the first processing is at a higher concentration than the chemical agent active ingredient concentration (ppm) in the process fluid of the second processing.
C10G 75/04 - Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of antifouling agents
4.
METHOD FOR PREVENTING FOULING OF HEAT EXCHANGER IN PETROLEUM PROCESSING
Provided are a novel method and a fouling-preventing agent, each of which makes it possible to prevent corrosion caused by a fouling-preventing agent during the prevention of the fouling of a heat exchanger in a petroleum processing. A method for preventing the fouling of a heat exchanger in a petroleum processing, the method comprising adding a phosphorous acid ester compound and a dispersing agent to a process fluid that passes through the heat exchanger, wherein the dispersing agent is a succinimide compound.
C10G 75/04 - Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of antifouling agents
5.
METHOD, AGENT AND KIT EACH FOR PREVENTING ATTACHMENT OF MARINE ORGANISM AND OTHERS
Provided are: a method for preventing the attachment of a marine organism and others, whereby it becomes possible to keep both of the effects of a halogen agent, e.g., a chlorine disinfectant and a bromine disinfectant, and chlorine dioxide and the effects of an aliphatic quaternary ammonium salt and a N-monosubstituted alkylene diamine for a long period while reducing the use amounts of the halogen agent and chlorine dioxide and also reducing the use amounts of the aliphatic quaternary ammonium salt and the N-monosubstituted alkylene diamine, and it also becomes possible to prevent the attachment of wide varieties of marine organism species and slime; an attachment preventing agent and an attachment preventing kit, each of which can be used for the method. A method for preventing the attachment of a marine organism and slime to a sea water coolant system, the method comprising adding a first chemical agent comprising an aliphatic quaternary ammonium salt represented by general formula (I) and/or a N-monosubstituted alkylene diamine represented by general formula (II) and a second chemical agent comprising at least one component selected from the group consisting of a chlorine disinfectant, a bromine disinfectant and chlorine dioxide to sea water in the sea water coolant system. (In formula (I), R represents a saturated or unsaturated linear aliphatic hydrocarbon group having 10 to 20 carbon atoms; R1and R3independently represent an alkyl group having 1 to 4 carbon atoms; R22n22 (II) (In formula (II), R represents a saturated or unsaturated linear aliphatic hydrocarbon group having 10 to 20 carbon atoms; and n represents an integer of 1 to 4.)
C02F 1/50 - Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
A01N 25/00 - Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
A01N 33/04 - Nitrogen directly attached to aliphatic or cycloaliphatic carbon atoms
Provided are a viscosity reducer composition and a black liquor concentration method, with which the fluidity of concentrated black liquor can be improved. The purpose of the viscosity reducer composition is to reduce the viscosity of black liquor in a black liquor concentration step of a chemical pulp production step, and the viscosity reducer composition contains a radical scavenger. The invention also relates to a black liquor concentration method, in which black liquor in a chemical pulp production step is concentrated in the presence of a radical scavenger.
Provided is a method for preventing fouling of a heat exchanger in a petroleum process. The method for preventing fouling of a heat exchanger in a petroleum process comprises adding a phosphite ester compound and a dispersant to a process fluid passing through the heat exchanger.
C10G 75/04 - Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of antifouling agents
A method for producing resin pellets using cooling water is improved or ameliorated. In one or more embodiments, the present invention pertains to a method for producing resin pellets including a resin pellet pelletization step that cuts resin extruded from an extruder while cooling or after cooling by cooling water, wherein the production method includes adding a composition including a lubricant that is an organic compound and a surfactant to the cooling water.
A method for treating cyanogen-containing wastewater, comprising adding a hypochlorite and hydrogen peroxide simultaneously or separately to cyanogen-containing wastewater, inducing decomposition of the cyanogen in the wastewater and/or formation of a water-insoluble compound with the cyanogen, and removing the cyanogen from the wastewater.
One or more embodiments of the present invention provide a method or a composition for suppressing contamination of tar at a part where scrubber water used for coke oven gas refinement makes contact. One or more embodiments of the present invention relate to a composition that is to be added to scrubber water used for coke oven gas refinement and that is used for suppressing contamination of tar at a part where the scrubber water makes contact, and the composition contains at least one surfactant selected from the group consisting of aqueous nonionic surfactants and anionic surfactants.
The present invention improves or amends a method for producing resin pellets by cutting, during or after cooling in cooling water, a resin that has been extruded from an extruder. In one or more embodiments, the method for producing resin pellets by cutting, during or after cooling in cooling water, a resin that has been extruded from an extruder, includes a surfactant and silicone being present in the cooling water. Also, in one or more other embodiments, the method for producing resin pellets includes a step for pelleting a resin extruded from an extruder by cutting the resin during or after cooling in water containing a surfactant and silicone.
Provided is a method for preventing fouling of a heat exchanger in a petroleum process. The method for preventing fouling of a heat exchanger in a petroleum process comprises adding an anticorrosive agent and a dispersant to a process fluid passing through the heat exchanger.
C10G 75/04 - Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general by addition of antifouling agents
C10G 7/10 - Inhibiting corrosion during distillation
13.
AGENT FOR HINDERING FORMATION OF MANGANESE SCALE IN SEAWATER AND METHOD FOR HINDERING AND PREVENTING MANGANESE SCALE
C02F 5/08 - Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
C02F 1/50 - Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
C02F 1/76 - Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
C02F 5/00 - Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
C02F 5/10 - Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
14.
METHOD FOR INHIBITING SLIME GENERATION IN PAPER MAKING PROCESS
Provided is a method for inhibiting slime generation in the paper making process with which the adhesion of slime is suppressed in each step in paper making process and incorporation of a slime fouling into paper products can be effectively inhibited. The method for inhibiting slime generation in paper making process involves adding a disinfectant which contains and/or generates monochloramine and/or monobroamine in the manner so that with respect to the paper-making process water which is to be treated, the rate of sterilization of the disinfectant is 50% or more and less than 90%. Consequently, the adhesion of slime in each step in paper making process is suppressed and incorporation of slime fouling into paper products can be effectively inhibited.
[Problem] To provide a waste liquid recycling system in which a waste liquid can be reused without being released into a river, etc. [Solution] In a reverse osmosis membrane device (9), a waste liquid is separated into concentrated water which contains metal ions, etc. and water which does not contain such ions, etc. The water separated with the reverse osmosis membrane device (9) has such quality that the water has a pH of 6.5-7.5, a chlorine concentration of 15 ppm or less, a conductivity of 110 µs/cm or less, and a COD of 13.3 ppm or less, which are on the water-quality level for industrial water. Hence, the water separated with the reverse osmosis membrane device (9) is sent to a pure-water device (10), where the water is mixed with fresh industrial water. The mixed water is subjected to painting pretreatment water washing and electrodeposition water washing.
A process for manufacturing a paperboard which comprises: a pulping step for forming a pulping-step slurry from a pulp raw material comprising waste paper as a main raw material through the macerating and refining of fibers; a furnishing step for adding a paper strong agent and other additives to the pulping-step slurry to form a furnished pulp raw material; and a papermaking step for making a paperboard from the furnished pulp raw material. Further, this process is characterized by adding (a) an aqueous solution of a hypochlorite and (b) an aqueous solution of a water-soluble inorganic ammonium salt or aqueous ammonia to the pulping-step slurry to attain a reduction in the amount of the paper strong agent to be added in the furnishing step.
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