83 results about "Cyanogen chloride" patented technology

The invention provides a continuous flow method for measuring total alkaloid in tobacco or tobacco products. In the method, potassium thiocyanate and sodium dichloro isocyanurate are adopted to carry out reactions to generate cyanogen chloride on line. The cyanogen chloride can carry out reactions with total alkaloid (calculated in the form of nicotine) in tobacco or tobacco products to break off the pyridine rings of nicotine, and then further carries out reactions with p-aminobenzene sulfonic acid. The reaction products are measured by a chromometer at 460 nm. The method uses a buffer system to control the pH value of the reaction system in a range of 6.0 to 7.5, and the buffer system is composed of a buffer solution A and a buffer solution B. The buffer solution A is prepared by the following steps: weighing disodium hydrogen phosphate and trisodium phosphate, placing the weighed substances in a beaker, dissolving the substances with water, transferring the solution to a volumetric flask (1L), and adding water into the volumetric flask until the water reaches the scale. The buffer solution B is prepared by the following steps: weighing p-aminobenzene sulfonic acid, disodium hydrogen phosphate, sodium dihydrogen phosphate, and sodium citrate, placing the weighed substances into a beaker, dissolving the substances with water, transferring the solution to a volumetric flask (1L), and then adding water into the volumetric flask until the water reaches the scale.

A system and method of filtering comprising adsorbing a toxic chemical using a metal-organic framework (MOF) compound that has been post-treated with fluorocarbons using plasma-enhanced chemical vapor deposition (PECVD). The toxic chemical may comprise any of ammonia and cyanogen chloride. Furthermore, the toxic chemical may comprise any of an acidic/acid-forming gas, basic/base-forming gas, oxidizer, reducer, and organic gas/vapor. The toxic chemical is physically adsorbed by the MOF compound. Moreover, the toxic chemical interacts with unsaturated metal sites within the MOF. Additionally, the MOF compound may comprise any of Cu-BTC, MOF-177, and an isoreticular metal-organic framework (IRMOF) compound. The MOF compound may comprise a metal-carboxylate bond. Additionally, the MOF compound may be unstable in the presence of moisture.

Herein are disclosed adducts of amines and polycarboxylic acids, and methods of making such adducts. Such adducts can be used to remove cyanogen chloride. Also disclosed are methods of providing such adducts on supports to form filter media. Also disclosed are methods of combining such filter media with catalysts and/or with porous polymeric webs to form filter systems.

The invention relates to a manufacturing method of chlorosulfonyl isocyanate, in particular to a method of taking cyanogen chloride, sulfuric anhydride and a sodium hydride water solution as raw materials to produce chlorosulfonyl isocyanate with high efficiency and low consumption. The manufacturing method of chlorosulfonyl isocyanate comprises the following steps: simultaneously adding liquid chlorine and a sodium cyanide water solution to a chlorination reactor for chlorination reaction; then preparing pure liquid cyanogen chloride by cooling, drying and refining; then adding the cyanogen chloride and the sulfuric anhydride which are respectively dissolved in inert solvents in equal mole ratio to the reactor; preparing the crude product of chlorosulfonyl isocyanate by reaction at low temperature; and preparing the finished product of chlorosulfonyl isocyanate by desolventizing, thermal decomposition and rectifying. The invention has simple method and easy implementation, the traditional production process is changed, and the liquid chlorine is not gasified and directly reacts with the sodium cyanide water solution to prepare the cyanogen chloride, thereby simplifying the process, greatly improving the yield and quality of the product, reducing the energy consumption, reducing the production cost of enterprises, and being an ideal manufacturing method of the chlorosulfonyl isocyanate.

The invention relates to a toxicant prevention material, particularly to a composite type protective material for comprehensive toxicant prevention. The material comprises activated carbon serving as a carrier and an impregnant adsorbed by the activated carbon, wherein the impregnant comprises 7%-10% (by weight) of Cu, 1%-2% (by weight) of Mo, 0.6%-3% (by weight) of an active component additive Ag, 0.4%-1% (by weight) of Zn and 5%-10% (by weight) of a multi-amine compound TEDA (triethylene diamine). The material is reasonable in design, and the composite type protective material capable of effectively protecting against various toxicants such as classic toxicants of HCN (hydrogen cyanide) and CNCL (cyanogen chloride), a penetrating toxicant of perfluoroisobutylene and the like, is developed.

Filter systems that are effective against a broad range of contaminants including HCN, cyanogen chloride (CK), acid contaminants. and basic contaminants such as ammonia without the need (but with the option, if desired) for using molybdenum or chromium containing materials. The filtering systems of the present invention include a tungsten-based material and other impregnants incorporated into a substrate such as filter media particles.

The invention discloses a preparation method of 2-azabicyclo(2.2.1)hept-5-alkene-3-ketone, which is an intermediate for the synthesis of antiviral medicine carbonyl ring nucleoside, which is characterized in that, an aqueous solution prepared by anhydrous sodium sulfite and sodium bicarbonate is added to a reactor; the temperature is controlled between 0 to 60 DEG C; a fixed amount of methanesulfonyl chloride is added by dropping, and the temperature is maintained to react for 2 to 4 hours to prepare methyl sulfonate solution; a fixed amount of ether solvent is added to the solution, and under a temperature ranging from 10 to 60 DEG C, cyanogens chloride is added; after 4 to 6 hours reaction, cyclopentadienyl is added by dropping; the pH value of the reaction solution is controlled between 1.5 to 3 to react for 3 to 5 hours; then sodium hydroxide is used for regulating the pH value to 7 to 9; after standing, the ether solvent is separated, and a fixed amount of methyl chloride is used for separated extraction 2-azabicyclo(2.2.1)hept-5-alkene-3-ketone; the methyl chloride is distilled and a crude product is obtained; the crude product is decolorized by activated carbon and recrystallized in ether solvent; 2-azabicyclo(2.2.1)hept-5-alkene-3-ketone with a purity of more than 99.6 percent is obtained after drying. The preparation method has the advantages of rich raw material sources, low cost, simple technological process, small emission of three wastes, benefits for industrial production and other advantages.

The invention relates to the technical field of the synthesis of fine chemical intermediates, particularly relates to the technical field of the production of cyanogen chloride, and discloses a method for producing the cyanogen chloride by using a tubular reactor. The method comprises the following steps of mixing liquid chlorine with a sodium cyanide aqueous solution according to the mole ratio of sodium cyanide to the liquid chlorine, which is 1 to (0.9 to 1.2), controlling the temperature of obtained mixed liquor to be 20 to 50 DEG C, afterwards, introducing the mixed liquor into the tubular reactor to react, controlling the pressure of the tubular reactor to be 0.1MPa to 2.0MPa, and controlling reaction temperature to be 20 to 60 DEG C, wherein the residence time of the reaction is 10s to 600s; discharging material liquid after the completion of the reaction into a desorption tower from the tail end of the tubular reactor, and controlling the temperature of the desorption tower to be 20 to 60 DEG C, so as to obtain a pure cyanogen chloride gas through desorption and drying. By using the method provided by the invention, the production efficiency can be improved; the method has the advantages that the production yield is high and further the reactor is simple.

A sensor for sensing gaseous chemicals includes a substrate, a variable resistance nanocrystalline ITO thin film formed on the substrate, and electrodes electrically coupled to the thin film. A sensor array assembly includes a sensor slide and a perforated interface circuit. The interface circuit abuts and electrically couples the sensor slide. The sensor slide includes several spaced apart ITO film strips formed on a slide substrate. A common electrode is electrically coupled to a common portion of each ITO film strip providing an electrically conductive path across the common portions of each of the plurality of spaced apart ITO film strips. A discrete electrode is electrically coupled to a discrete portion of each ITO film strip. The interface circuit is configured to abut and electrically couple to the sensor slide. A conductive discrete electrode pad electrically couples each of the plurality of discrete electrodes of the sensor slide to discrete terminals on the interface circuit. A conductive common electrode pad is associated with and electrically couples the common electrode of the sensor slide to a common electrode on the interface circuit. Apertures in the interface circuit expose the thin film to the environment. Resistance changes in a detectible manner upon exposure to sensible chemicals at ambient temperature, such as 1,2,2-Trimethylpropyl methylphosphonofluoridate (soman, GD), O-Ethyl S-(2-isopropylaminoethyl) methylphosphonothiolate (VX), distilled bis(2-chloroethyl) sulfide (mustard, HD), carbonyl chloride, Phosgene (CG) and cyanogen chloride (CK), ozone, carbon monoxide, carbon dioxide, acetylene, propane, ammonia, sulfur dioxide, ethanol, methanol, volatile organic compounds and industrial toxic chemicals.

A method for producing chlorosulfonyl isocyanate by reaction of sulfur trioxide with cyanogen chloride, wherein chlorosulfonyl isocyanate or a solution including chlorosulfonyl isocyanate is used as a reaction solvent, sulfur trioxide and cyanogen chloride which are respectively diluted with the chlorosulfonyl isocyanate or the solution including chlorosulfonyl isocyanate are added at the same time to a reaction system in an almost equimolar amount under reflux. By the production method of present invention, chlorosulfonyl isocyanate can be produced from sulfur trioxide and cyanogen chloride in which the yield of the chlorosulfonyl isocyanate is high, the method has excellent operability, number of equipments is reduced, and time for controlling the temperature is saved.

The invention provides a chlorination reaction device and a chlorination reaction technology for preparing cyanogen chloride. Chlorination reaction is carried out at a relatively low temperature in the divided three steps of pre-reaction, intermediate reaction and post-reaction. Cyanide is almost completely consumed, and the product residence time is shortened by the technology, so that unnecessary side reactions can be removed, and the raw material yield is maximized.

The invention relates to a toxicant prevention material, particularly to a preparation method of a composite type protective material for comprehensive toxicant prevention. The method comprises the steps as follows: (1) the composite type protective material for the comprehensive toxicant prevention comprises activated carbon serving as a carrier and an impregnant adsorbed by the activated carbon, wherein the impregnant comprises 7%-10% (by weight) of Cu, 1%-2% (by weight) of Mo, 0.6%-3% (by weight) of an active component additive Ag, 0.4%-1% (by weight) of Zn and 5%-10% (by weight) of a multi-amine compound TEDA (triethylene diamine); the content of basic cupric carbonate, ammonium molybdate, silver nitrate and zinc carbonate of the impregnant of active components are calculated according to the content of the active components such as the Cu, the Mo, the Ag and the Zn respectively. The method is reasonable in design, and the composite type protective material capable of effectively protecting against various toxicants such as classic toxicants of HCN (hydrogen cyanide) and CNCL (cyanogen chloride), a penetrating toxicant of perfluoroisobutylene and the like, is developed.

The invention relates to a method for purifying waste gases produced during the production of cyanuric chloride. In the first step, the waste gas is treated with a weak alkaline, aqueous solution that contains hypochlorite and is treated, in the second step, with a strongly alkaline, aqueous solution. The harmful substances chlorine cyanide and chlorine are practically quantitatively bonded without it leading to a high contamination of waste water.

The invention discloses an esterification process of cyanate ester resin. The process comprises the following steps: step S1, weighing the following raw materials in parts by weight: 10-15 parts of diphenolyl propane, 0.5-1.0 part of triethylamine, 35-50 parts of acetone, 25-35 parts of absolute ethanol, and 20-30 parts of cyanogen chloride; step S2, adding diphenolyl propane and triethylamine toa beaker containing acetone, performing heating in a 45 DEG C water bath, performing stirring for 45 min at a rotation speed of 100 r/min, performing taking out, and performing standing for 30 min toobtain a mixed liquid A; and step S3, carrying out a reaction through a reaction kettle. In the process, the reaction kettle has high heat exchange efficiency and good heat exchange effect, reaction heat can be quickly taken away, and thus occurrence of side reactions is not easy to cause. Materials can be subjected to cutting during stirring to avoid uneven reaction due to increased viscosity ofthe materials along a reaction is carried out, and heat exchange efficiency can be further improved by mixing with remaining materials after heat exchange is completed.

The invention discloses a cyanogen chloride preparation method, which comprises: 1, mixing sodium cyanide and water according to a certain ratio, and uniformly stirring to prepare a 30% sodium cyanidesolution; 2, respectively spraying the 30% sodium cyanide solution obtained in the step 1 and liquid chlorine into a tubular reactor at a certain feeding speed, wherein the gas outlet of the tubularreactor is connected with a condenser; 3, introducing the mixed gas obtained from the gas outlet of the condenser in the step 2 into a desorption tower, and carrying out desorption treatment; and 4, feeding the gas desorbed in the step 3 into a rectifying tower, and purifying. According to the invention, the mixing effect of the 30% sodium cyanide solution and the liquid chlorine in the tubular reactor is good, and the desorbed material liquid is rectified, so that the purity of cyanogen chloride is improved, and the content of the obtained cyanogen chloride can reach more than 97%.

The invention discloses metal nanoparticle loaded activated carbon. According to the metal nanoparticle loaded active carbon, metal nanoparticle dispersion liquid and an activated carbon carrier are fully mixed and then are put into high-temperature airflow to be dried so as to obtain the metal nanoparticle loaded activated carbon, the loading capacity of metal nanoparticles is 2-14% of the mass of the activated carbon carrier, and the mass of the metal nanoparticle dispersion liquid is 48-70% of the mass of the activated carbon carrier. The invention further discloses related production equipment used for the metal nanoparticle loaded activated carbon and a preparation method for the metal nanoparticle loaded activated carbon. The metal nanoparticle loaded activated carbon obtained by utilizing the preparation method for the metal nanoparticle loaded activated carbon has the advantages that the particle size distribution of the loaded metal nanoparticles is uniform, the physical adsorption performance and the chemical catalytic performance of the activated carbon are balanced and efficient, a preparation process is simple, and non-polar harmful gas such as benzene vapor, chloroethane vapor and formaldehyde and strong-polarity harmful gas such as cyanogen chloride and hydrocyanic acid can be effectively adsorbed.

The invention discloses a preparation method of albendazole, which comprises the following steps of: dissolving 4-propylthio-o-phenylenediamine in methanol, cooling, keeping the temperature at 0-5 DEGC, slowly dropwise adding cyanogen chloride for reaction under the condition of uniform stirring, and regulating and keeping the pH value at 4-5 in the process; heating to 35-45 DEG C after dropwiseadding is finished, carrying out heat preservation for 1-2 hours, then carrying out atmospheric distillation to recover methanol to obtain a solid-liquid mixed aqueous solution, and carrying out cooling, filtering and drying to obtain 6-propylthio-2-amino-1-hydrogen-benzo [d] imidazole; adding the obtained product into methanol, stirring, cooling, maintaining the temperature at 5-10 DEG C, slowlydropwise adding methyl chloroformate, and adjusting and maintaining the pH value at 6-7; after dropwise adding is finished, heating to 35-45 DEG C, keeping the temperature for 1-2 hours, distilling atnormal pressure to recover methanol, cooling to 15-20 DEG C, and performing filtering and drying to obtain an albendazole product. The method has the advantages of mild process conditions, low cost of used raw materials, water saving, strong reaction activity, good selectivity, high product yield and good product quality.

The invention relates to a method for synthesizing a 1-halo-2-aryl indolizine compound. According to the method, the 1-halo-2-aryl indolizine compound can be conveniently and effectively synthesized by using brominated N-ethyoxyl carbonyl methyl pyridinium salt (or chlorinated N-cyan methyl pyridinium salt) and 1,1-dibromo-2-arylethylene (or 1-halo-2-arylacetylene) as substrates under the action of alkali. Compared with the existing methods, the method provided by the invention has the advantages that the range of adaptable substrates is wide, reaction conditions are mild, no catalyst is needed, and reaction efficiency is high and is simple to operate, thus the method has an important application value.

The invention relates to a method for preparing (+/-)-2-azabicyclo[2, 2, 1]hepta-5-alkene-3-ketone. The method includes: using sodium sulfite and methyl sulfonyl chloride in the aqueous solution of sodium acetate to generate sodium methanesulfinate, adding fixed-quantity halogenated hydrocarbon solvent and cyclopentadiene monomer, dropwisely adding the solution formed by cyanogen chloride monomer and halogenated hydrocarbon into reaction liquid, using sodium acetate aqueous solution to regulate the pH of the reaction system so as to allow the pH to be in a specific range, and extracting, regulating pH and concentrating after the reaction to obtain the (+/-)-2-azabicyclo[2, 2, 1]hepta-5-alkene-3-ketone with the purify not smaller than 98% and yield not smaller than 94%. The method is good in product quality, high in yield, low in raw material cost, simple in process, easy to operate, and the like, so that the method has better economic advantages and high competiveness in industrial production.

The invention discloses a preparation method of a trifloxystrobin intermediate (E)-2-(2-bromomethyl phenyl)-2-methoxylimidomethyl acetate. According to the preparation method, the (E)-2-(2-bromomethyl phenyl)-2-methoxylimidomethyl acetate, which is obtained by performing chlorination, cyanation, hydrolyzation, esterification and oximation through O-methylbenzoic acid, is used as raw material; through analysis of a bromination reaction process, hydrogen bromide released in a bromination reaction process is converted to bromine by using an oxidizing agent; the bromine continuously takes part in reaction; and a synthetic process condition is optimized, so that the utilization rate of bromine atoms is improved, a content and a yield of bromide product are improved, the quality of trifloxystrobin product is improved, the discharge of bromide-containing wastewater is reduced, the corrosion to equipment and the pollution to the environment are reduced and the production cost is reduced.

The invention discloses a cyanogen chloride preparation process for cyanate ester resin synthesis. According to the process, a reactor is used in a cyanogen chloride preparation process, and comprisesa base, a reaction bin is arranged on the upper surface of the base, a discharging port is formed in the bottom end of the reaction bin, a material collecting port is formed in the top end of the reaction bin, and a first material storage bin, a condensation bin, a first material receiving bin, a second material storage bin and a second material receiving groove are further fixed to the upper surface of the base; a sodium cyanide aqueous solution in the first storage bin is pressed into a liquid spraying pipe from a liquid conveying vertical pipe through a booster pump and is sprayed out by liquid spraying heads, and the liquid spraying heads are arranged in a crossed manner, so that the sodium cyanide aqueous solution is completely atomized, and the whole reactor is filled with the sodium cyanide aqueous solution; gas spraying pipes are located on the upper side and the lower side of the liquid spraying pipe, so that chlorine can make full contact with the sodium cyanide aqueous solution when entering the reactor; and by arranging a discharge port valve and a first liquid guide valve, the unreacted sodium cyanide aqueous solution enters the reaction bin again, so that the sodiumcyanide aqueous solution and the chlorine react sufficiently.