Abstract: A process for preparing cyanuric acid by cooling an isocyanuric acid/ammonia gas mixture having a temperature of 300.degree. to 480.degree. C. to 200.degree.-300.degree. C., whereupon cyanuric acid is separated off and isolated at this temperature in an apparatus suitable for separating solids from gases, and unreacted isocyanuric acid/ammonia gas mixture is recycled or further processed.

Abstract: Melamine cyanurate is prepared by heating melamine powder and cyanuric acid powder at 250.degree. to 500.degree. C. substantially in the absence of any liquid medium. The melamine cyanurate can be obtained in a granular form when the heating is conducted subsequent to granulation of a mixture of both the powders.

Abstract: Process for preparing isocyanic acid by bringing cyanuric acid into contact with an aluminum catalyst at temperatures of from 300.degree. to 600.degree. C. and isolating the isocyanic acid formed or directly using it for further reaction.

Abstract: The plant is provided with a first rotary reactor where the balls of urea cyanurate are formed and a second reactor where the pyrolysis takes place. The first reactor is provided with an internal helical fin and the second reactor is also rotary. At the exit thereof there is a communication tube placing it in communication with a solids separator vessel which receives an aqueous solution capable of reaching a working level, below which there is the access port of the tube to the vessel. The vessel is provided with a lower drain valve and an upper gas exhaust tube.

Abstract: A curing agent for the production of low gloss powder coatings based on epoxy resins consists essentially of a mixture of the components a) 2-imidazoline derivative having a melting point of >60.degree. C. and b) cyanuric acid as well as, if desired, anticaking agents or/and stabilizers. The low gloss powder coatings produced with these curing agents have the desired low degrees of gloss and good adhesive strengths, they form smooth and uniform surfaces and show no signs of yellowing even after long stoving times.

Abstract: Phenylalkylamines of the formula ##STR1## where n is 5, 6, 7, 8 or 9, m is 1, 2 or 3, R.sup.1 is methyl, halogen, substituted or unsubstituted aryl or substituted or unsubstituted phenoxy, and, when m is 2, two adjacent radicals R.sup.1 together denote the radical ##STR2## X is oxygen, except when R.sup.1 is methyl, or the radical ##STR3## R.sup.4 is isopropyl, tert-butyl or substituted or unsubstituted phenyl and R.sup.5 is H or OH, R.sup.2 and R.sup.3 are each hydrogen and, when X is oxygen, R.sup.2 and R.sup.3 additionally denote methyl or ethyl, and their plant-tolerated salts, and fungicides containing these compounds.

Abstract: There is provided a pest control composition containing a compound represented by the formula, ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and independently mean a hydrogen atom, a hydrocarbon group which may be substituted or a heterocyclic group which may be substituted and X means an electron attracting group or a salt thereof.The compounds are of minimal toxicity to man, domestic animals and fish and selectively display remarkable control effect on pests.

Abstract: A process for the purification of crude cyanuric acid containing aminotriazine compounds as impurities which comprises digesting the crude cyanuric acid in an aqueous solution containing low concentrations of a mineral acid. The mineral acid is, for example sulfuric acid, nitric acid, hydrochloric acid, or phosphoric acid. The digestion is operated at a temperature in the range of from about 120.degree. C. and about 220.degree. C. and autogenous pressure using a stoichiometric ratio of sulfuric acid to aminotriazine compounds of less than 1, to produce a slurry of purified cyanuric acid in an acid depleted ammonium sulfate solution.Purification of cyanuric acid by the process of the present invention permits a substantial reduction in the amounts of acid used in the digestion and the base required for ammonia stripping and neutralization of the spent acid from the digestion. This provides significant cost savings in the digestion and waste treatment methods.

Abstract: In a process for producing a metal phthalocyanine and/or its derivative by heating phthalic anhydride and/or its derivative, urea and a metal compound in an organic solvent in the presence of a catalyst, or by heating phthalodinitrile and a metal or a metal compound in an organic solvent, the improvement wherein the reaction for the production of the metal phthalocyanine and/or its derivative is conducted by an addition of cyanuric acid and/or its derivative.

Abstract: The process of producing from urea a reaction product which is predominantly cyanuric acid, which process involves only the application of heat without use of solvents or catalysts. The process in its first stage involves heating molten urea for a time and at a temperature to convert the urea to a first stage reaction product comprising less than 40% urea and at least 30% biuret, then cooling and comminuting the first stage reaction product, then as a second stage of the process, passing hot air through the comminuted first stage reaction product at temperatures progressively increasing but maintained below the melting point of the reaction, such solid phase heating of the reaction product during the second stage of the process being maintained until the cyanuric acid content is at least about 50% of the final reaction product and is preferably at least about 70%.

Abstract: A process for producing cyanuric acid which comprises feeding a urea hydrohalide compound to a pyrolysis zone.The urea hydrohalide compound is pyrolyzed to produce a solid reaction mixture of cyanuric acid and an ammonium halide. The solid reaction mixture is vaporized to remove the ammonium halide to form a gaseous mixture containing ammonia and hydrogen halide which is simultaneously removed from the pyrolysis zone. The cyanuric acid recovered is substantially free of ammonium halide.The novel process produces high purity cyanuric acid in the absence of liquid effluents while readily recovering the ammonia and hydrogen halide values.

Abstract: There is disclosed a method for the conversion of urea to cyanuric acid and cyclic by-products which comprises exposing urea in a liquid state to microwave radiation. Urea in liquid form, either molten anhydrous or in solution, is absorbent to microwave radiation, readily converting to cyanuric acid and cyclic by-products such as ammeline and ammelide. The desired products are substantially transparent to microwave radiation and the method thus avoids degradation of the desired products. Conversion of urea with microwave radiation also avoids the difficulties experienced with thermal decomposition that results from the poor thermal conductivity of the crude reaction products. The method thus permits conversion of urea in the form of a layer of urea directly to cyanuric acid and cyclic by-products.

Abstract: A number of novel amides were found to be highly effective as cockroach repellents.

Abstract: A process is described for concentrating a dilute slurry of s-triazine compounds in a liquid phase which comprises:(a) passing said dilute slurry across an enclosed surface of a porous medium(b) at an elevated pressure(c) and at a flow rate of at least about 8 feet per second, whereby a portion of said liquid phase flows through said porous medium, thereby concentrating said particles in said slurry.

Abstract: The disclosure relates to a process for making granulated cyanuric acid. To this end, the disclosure provides for cyanuric acid granules having the particle size targeted for the final product to be used as feed material, for the said feed material, urea and water to be used in a ratio by weight of 1.5-3:1:0.04-0.08 and to be made into a preliminary mixture, and for the mixture to be allowed to stand over a period of 10 to 20 hours prior to heating it with continuous agitation to temperatures of 270.degree. to 340.degree. C. over as long a period as necessary to effect the condensation of the urea to cyanuric acid.

Abstract: A triazine addition compound consisting essentially of one mole of a triazine derivative having the formula (I): ##STR1## in which R is a divalent hydrocarbon residue containing 1-12 carbon atoms, and one or two moles of at least one compound selected from the group consisting of cyanuric acid and isocyanuric acid.Processes of the preparation of the addition compound and a flame-retarded polyamide composition are also disclosed.

Abstract: A process is provided to produce a solution or slurry of cyanuric acid in an inert solvent essentially free from by-product impurities from an aqueous solution of urea and/or biuret. Optionally, the cyanuric acid product may be separated from the inert solvent by filtering, centrifuging or distilling off the inert solvent and leaving the cyanuric acid solid.

Abstract: There is disclosed a process for producing cyanuric acid from urea using an external heating type reaction vessel furnished with agitator provided with plural urea supply ports in the direction of conveyance of the contents at such an interval as to make the residence time of the contents about 2 to 20 minutes, heating the urea in the presence of crude cyanuric acid to a temperature of 230.degree.-320.degree. C. to subject it to heat decomposition, and recycling a part of the formed crude cyanuric acid to the reactor.

Abstract: In a process for the manufacture of cyanuric acid by heating urea at a temperature above its melting point, an aqueous solution of urea is sprayed onto granules of crude cyanuric acid, recycled externally, and heated at a temperature of 220.degree.-280.degree. C. in a heat exchange zone heated by the walls thereof. A rotor in the device comprising a tubular shaft on which hollow discs are mounted, and in which a heat-transfer fluid circulates, is also employed to heat the material to the manufacture cyanuric acid in high yields.

Abstract: A highly pure cyanuric acid is produced by a process which comprises gradually adding a nitrogenous material capable of producing cyanuric acid, such as urea, to a hot N-methylpyrrolidone solvent. The overall process converts substantially all of the urea to cyanuric acid which, upon drying, is a free flowing product capable of being converted into trichloroisocyanuric acid and similar compounds with a minimum of extra processing while allowing substantially complete recovery of the N-methylpyrrolidone solvent for reuse.

Abstract: A highly pure cyanuric acid produced by pyrolyzing a nitrogenous containing material capable of yielding cyanuric acid, such as urea, in an alkyl dinitrile solvent such as adiponitrile, at elevated temperatures, is disclosed. The overall process converts substantially all of the urea to cyanuric acid and cyanuric acid derivatives which are capable of being converted into trichloroisocyanuric acid and similar compounds, while allowing substantially complete recovery of the nitrile solvent for reuse.

Abstract: Isocyanic acid is trimerized to cyanuric acid by contacting the isocyanic acid with liquid organic solvent, preferably polar solvent having high dielectric constant. The product is recovered as precipitate of good purity. Conversion and yield are high.

Abstract: Cyanuric acid is produced in a process in which a solution of urea or biuret is pyrolyzed by contacting the solution with a heated gas at temperatures which substantially pyrolyze urea or biuret while concurrently evaporating the solvent.The novel process simplifies solvent recovery, reduces solvent losses and has reduced requirements for processing equipment.

Abstract: A synthetic paper prepared by stretching a sheet of a composition comprising a thermoplastic resin mainly composed of an olefin-based resin and an adduct of melamine and isocyanuric acid or cyanuric acid to a size of 1.3 times or more the original size of the sheet at a temperature lower than the melting temperature of the olefin-based resin; such synthetic paper has good luster and sliding properties.

Abstract: A highly-pure cyanuric acid is manufactured in a continuous process whereby urea and/or biuret are dissolved in an inert solvent and circulated at a high velocity and a temperature in the range of about 180.degree. C. to about 250.degree. C. through a loop between a heat exchanger and a forced circulation evaporative crystallizer body. Cyanuric acid crystallizes from the reaction mixture as it circulates to form a slurry. Ammonia formed during the reaction is removed at reduced pressure as the reaction mixture enters the evaporative crystallizer body. A portion of the slurry of cyanuric acid is continuously removed as it circulates through the loop and may be filtered to recover the cyanuric acid. The filtrate is returned to a feed tank and additional solvent, urea or biuret added to meet the concentration desired in the reaction mixture. The solution from the feed tank is added to the reaction mixture circulating through the loop at a rate to replace the volume of cyanuric acid slurry that is removed.

Abstract: Cyanuric acid is mechanically separated such as by filtration, centrifugation, or centrifugal filtration from a slurry of cyanuric acid, urea, biuret, and an inert solvent in which the urea is soluble at temperatures above about 170.degree. C. to reduce the urea content of the recovered solid cyanuric acid. The biuret and solvent content of the solid cyanuric acid is also reduced.

Abstract: Pure cyanuric acid is prepared from crude or waste melamine by introducing the melamine into 70 to 80% strength sulfuric acid at room temperature and heating the reaction mixture to 150.degree. to 190.degree. C., the water introduced with the sulfuric acid being distilled off during the heating period.

Abstract: The present invention is concerned with novel triarylmethane dyes possessing in their triaryl structure a 4'-oxo-1'-naphthylidene (or a 4'-oxo-1'-phenylidene) moiety and a phenyl moiety substituted in the ortho-position to the central carbon atom with the group ##STR1## wherein R is alkyl, unsubstituted or substituted with a solubilizing group, and Y is an electron-withdrawing group, which compounds find utility in photographic products and processes.

Abstract: The present invention is concerned with novel triarylmethane dyes possessing in their triaryl structure a 4'-oxo-1'-naphthylidene (or a 4'-oxo-1'-phenylidene) moiety and a phenyl moiety substituted in the ortho-position to the central carbon atom with the group ##STR1## wherein R is hydrogen; alkyl, unsubstituted or substituted with halo, alkoxy, carboxy-substituted alkoxy, phenoxy or phenyl; or phenyl, unsubstituted or substituted with halo, alkoxy, nitro, dimethylamino or alkyl, which compounds find utility in photographic products and processes.

Abstract: Anhydrous cyanuric acid containing amounts of occluded solvent is recrystallized to a purified cyanuric acid dihydrate by slurrying the contaminated anhydrous cyanuric acid in an aqueous medium.

Abstract: An improved process for the preparation of cyanuric acid in which urea/biuret is converted into cyanuric acid but wherein the co-production of the impurities, ammelide and ammeline is significantly reduced. Cyanuric acid is prepared by heating urea/biuret in a suitable polar organic solvent in the presence of an ammonium-, alkali metal- or alkaline-earth metal nitrate.

Abstract: A lubricant containing an adduct of melamine and isocyanuric acid or cyanuric acid is effective for use in high-temperature, low-temperature, or high-pressure atmospheres, or places where black-color producing contamination is not desired, or in metal working, cutting or grinding of metals. The adduct not only functions as a solid lubricant but also as an agent to thicken liquid lubricants such as mineral oil, and it is used as a powder, or as suspended in a lube oil, grease or water, or it can be applied to surfaces subject to wear using a synthetic resin such as vinyl resin or epoxy resin as a binder.

Abstract: A resin composition comprising as flame retardant 3 to 50% by weight of a reaction product of a polyguanamine compound and a cyanuric or isocyanuric acid compound has excellent flame retardancy, excellent physical properties and excellent molding characteristics (no mold deposit nor bleed out).

Abstract: Concentrated slurries of cyanuric acid are produced in a process which comprises feeding urea to a hot solvent. In the hot solvent, the urea is pyrolyzed to produce a reaction mixture of cyanuric acid particles in the solvent. Agitation of the reaction mixture forms a suspension of cyanuric acid particles. At cyanuric acid concentrations of from about 20 to about 50 percent by weight, the cyanuric acid particles are settled from the suspension to produce a concentrated slurry phase and a supernatent solvent phase. The concentrated slurry phase is then separated from the solvent phase.The process produces concentrated cyanuric acid slurries which minimize the complexity and cost of solvent recovery, reduces energy requirements for heating the reaction mixture and recovering the solvent, and maximizes heat transfer efficiency during the pyrolysis reaction.

Abstract: A continuous process is disclosed for the production of monoalkali metal cyanurates. In the process, cyanuric acid and an aqueous solution of the alkali metal hydroxide are continuously reacted in a first reactor to produce a first slurry comprised of cyanuric acid and a monoalkali metal cyanurate. This first slurry is conveyed to a second reactor to further react the cyanuric acid with the alkali metal hydroxide to produce a second slurry comprised of the monalkali metal cyanurate.The novel process produces slurries of monoalkali metal cyanurate which are consistent both with respect to chemical composition and solids content while reducing equipment and operating costs.

Abstract: A process is provided for solvent recovery from a hot gaseous mixture comprised of ammonia, carbon dioxide, cyanuric acid particles, and solvent vapors. The process comprises scrubbing the hot gaseous mixture with a liquid solvent to remove the cyanuric acid particles and to form a scrubbed gaseous mixture. The scrubbed gaseous mixture is cooled to form condensed liquid solvent and a cooled gaseous mixture containing traces of the solvent. The temperature of the cooled gaseous mixture is kept above that at which ammonium carbamate is formed by the reaction of ammonia with carbon dioxide. Condensed liquid solvent is separated from the cooled gaseous mixture and the cooled gaseous mixture is contacted with additional liquid solvent to form a substantially solvent-free gaseous mixture.

Abstract: A process for producing cyanuric acid by pyrolyzing urea in a solvent in a closed reactor having interior surfaces exposed to a gas zone, the improvement which comprises contacting the interior surfaces of the closed reactor with solvent in the presence of heat to inhibit the formation of solid deposits on the interior reactor surfaces.The process maintains high rates of heat transfer during the reaction period and reduces the frequency and cost of reactor cleaning.

Abstract: A process is described for the purification and recovery of cyanuric acid from a hot slurry of cyanuric acid in an organic solvent. In the process, the hot slurry is quenched in a quench liquid which is at a temperature for cooling the hot slurry to form a cooled slurry of cyanuric acid particles in a mixture of the solvent and the quench liquid. Cyanuric acid particles are separated from the mixture of solvent and quench liquid and recovered.The process effectively cools and separates cyanuric acid from the solvent and any color bodies present to produce a pure white crystalline product.

Abstract: Unreacted urea and/or biuret contaminants in a cyanuric acid-inert solvent reaction product are removed by distilling the solvent therefrom at a temperature of from about 150.degree. C. to about 250.degree. C. and at a pressure of from about 70 to about 170 mm. of Hg. A distillate of said solvent containing the urea, biuret and a cyanuric acid reaction product is collected.

Abstract: An improved process for the preparation of cyanuric acid from urea/biuret. The cyanuric acid mass comprised of cyanuric acid and retained residual solvent is discharged from the reaction vessel and is fed to a heated fluidized bed of cyanuric acid particles for the removal of residual retained solvent.

Abstract: An improved process for the manufacture of cyanuric acid by heating a reaction solution of urea, biuret, or mixtures thereof, in a solvent and stripping the reaction solution with a stripping gas. The process recycles waste gas produced by the reaction solution as the stripping gas.

Abstract: An improved process for the manufacture of cyanuric acid by heating a reaction solution of urea, biuret or mixtures thereof in a solvent and stripping the reaction solution with an inert auxiliary stripping gas. The inert auxiliary stripping gas is characterized as having a boiling point which ranges between that of ammonia and the reaction temperature at the reaction pressure.

Abstract: A process for recovering chlorine values from an aqueous solution of a chloroisocyanuric acid compound is disclosed. After reacting a mineral acid with the aqueous solution to form an acidified reaction mixture containing dissolved chlorine, the reaction mixture is fed to a stripping column which employs an inert gas to remove the dissolved chlorine. The stripping column is maintained to provide a continuous liquid phase and a non-continuous gas phase. Chlorine gas is readily recovered in a vessel such as a scrubber. Cyanuric acid may be subsequently recovered from the chlorine-depleted solution.

Abstract: The present invention is an improvement in a process for the production of sodium dichloroisocyanurate (SDCC) wherein both an aqueous reaction mixture containing SDCC and the by-product NCl.sub.3 and a gaseous phase containing NCl.sub.3 vapor are formed, said improvement comprising passing an inert gas through said aqueous phase to remove said NCl.sub.3 vapor from said gaseous phase.

Abstract: An improved process for preparing cyanuric acid by heating urea or biuret or a mixture thereof in a solvent to produce a cyanuric acid product of high purity.

Abstract: Processes are disclosed for providing in situ generated cyanic acid and simultaneously preparing certain carboxamides which have a tertiary aliphatic substituted ammonium or pyridinium group substituted on the alpha carbon atom.

Abstract: An improved process for preparing cyanuric acid by heating urea or biuret or a mixture thereof in a solvent to produce a cyanuric acid product of high purity.

Abstract: A device for dispensing solid into a liquid medium. The device utilizes a funnel with a vortical stream therein for feeding solids into a reaction zone. A portion of the contents of the reaction zone are recycled to supply the fluid for the vortical stream. The device finds particular use in dispersing dry particulate blends of isocyanuric acid and trichloroisocyanuric acid into a reaction slurry.

Abstract: Organic phosphites are provided having at least one 2,2,6,6-tetramethyl piperidyl substituent attached at the 4-position to phosphorus through oxygen, and at least one polyol or polyphenol group, which are superior light and heat stabilizers for organic polymeric mterials such as polyethylene, polypropylene, polyvinyl chloride, acrylonitrile-butadiene-styrene terpolymers, polyamides, polystyrene, and similar polymers.

Abstract: Crude cyanuric acid of improved purity is obtained by pyrolyzing mixtures of urea, recycled cyanuric acid and either ammonium nitrate or concentrated nitric acid at temperatures of about 250.degree. to 300.degree. C.