222results about "Sulfur and halogen compounds" patented technology

The invention relates to a method for recycling tail gas during thionyl chloride preparation, which belongs to the field of chemical engineering process. The method is that delivering the gas released during the transportation process of thionyl chloride crude product from a crude product vulcanizing tank to a crude product intermediate tank and the gas remained after the rectification and the condensation of the thionyl chloride to a thionyl chloride synthesis kettle for cyclic utilization by using a gas compression conveying machinery. The sulfur dioxide method thionyl chloride manufacturing technology forms a perfect gas phase closed cycle, which enables the yield of thionyl chloride to be above 99 percent, and saves a great amount of tail gas absorption alkali and eliminates environment pollution. The liquid ring type compressor has the advantages that the operation is simple and convenient, the construction cost is low, the maintenance quantity is small and no additional agent is used in the system.

Compounds (I) A_aM_m(YO4)_yZ_z (I) are provided where A is at least one element selected from the alkaline metals, alkaline earth metals, a doping element and a hole, M being (T1-1TV), T being one or more transition metals and T′ being at least on element selected from Mg, Ca, Al, and the rare earths, 0≦t<1; Y is a least one element selected from S, Se, P, As, Si, or Ge and A1; Z is at least one element selected from F, O or OH; a, m, y, and z are whole numbers of zero or above such that the electric neutrality of the inorganic oxide of formula (I) is respected, a≧O; m>O; y>0; z≧O. The compounds (I) are obtained from precursors of the constituent elements by means of a method comprising the following steps: dispersion of said precursors in a liquid support comprising one or more ionic liquids made up of a cation and an anion the electric charges of which balance out to give a suspension of said precursors in said liquid, heating said suspension to a temperature of 25 to 380° C. and separation of said ionic liquid and the inorganic oxide of formula (I) from the reaction of said precursors.

Continuous production of sulfur tetrafluoride is carried out by synthetic reacting, cooling to separate SF4 from halogen, returning and reutilizing halogen, gas-phase purifying, liquefying and filling. The halogen fluoride has synthetic reaction with pure industrial brim stone proportionally in a reactor, with reacting temperature of 110deg.C-500deg.C, reacting pressure 0.1-1.0MPs, the mole ratio of halogen fluoride to S = 4-5:5 and the excess of the halogen fluoride = 0-25%. It achieves low cost, simple process and higher efficiency.

The invention relates to a sulfur hexafluoride separation and purification device and a purification method thereof, wherein, the purification device comprises a first separating container and a second separating container. The air inlet of the first separating container is connected with a sulfur hexafluoride source through a first compressor, and the air outlet of the first separating container is connected with the air inlet of the second separating container through a buffer container and a second compressor. A ninth on-off valve is arranged between the second compressor and the second separating container; the first on-off valve is arranged between the air outlet of the first separating container and the buffer container; the fluid outlet of the first separating container is connected with a liquid storage container through the second on-off valve, and the air outlet of the liquid storage container is connected with the air inlet of the buffer container through a third on-off valve; the air outlet of the buffer container is connected with the air inlet of the first compressor through a fourth on-off valve; the air outlet of the second separating container accesses to the atmosphere through a pressure reducing valve and a fifth on-off valve, and the fluid outlet of the second separating container is connected with the fluid inlet of the first separating container through a sixth on-off valve.

The invention relates to a continuous-pressure-changing rectification method and a device for preparing medicine-level sulfoxide chloride. With the adoption of the pressure-changing rectification method, an indirect sequence of carrying out heavy component removal and then carrying out light component removal is adopted as a rectification sequence, so that the decomposition of sulfoxide chloride at high temperature is reduced; sulfur is coarsely mixed with raw materials, sulfur is mixed with tower top gas of a heavy component removal tower, and a low-boiling-point substance, namely sulfur dichloride which is hard to remove, is fundamentally converted into a high-boiling-point substance, namely sulfur monochloride which is easy to remove, due to multistep sulfur adding; and a catalyst is added, so that the dissolution rate and reaction rate of the sulfur are accelerated. The heavy component removal tower is subjected to normal-pressure operation; and a light component removal tower is subjected to depressurized operation. The energy consumption of operation is reduced, and the decomposition reaction of the sulfoxide chloride hardly carries out under depressurized conditions, so that the probability that the color and luster of products are polluted by sulfur dichloride is greatly reduced, high-purity and colorless sulfoxide chloride products are produced from tower bottoms, and the content is over 99.9%.

The invention provides a tail gas recovery device for a sulfur hexafluoride gas test instrument. The tail gas recovery device comprises an external gas storage tank and a main tail gas recovery device body, wherein the main tail gas recovery device body comprises a to-be-tested gas source inlet and a buffer tank; the to-be-tested gas source inlet is connected with a gas inlet of the sulfur hexafluoride gas test instrument through a gas connecting pipeline; a mass flow controller is arranged between the to-be-tested gas source inlet and the gas inlet of the instrument; one end of the buffer tank is connected with a tail gas outlet of the sulfur hexafluoride gas test instrument through a gas connecting pipeline, and the other end of the buffer tank is connected with a gas pump through a gas connecting pipeline; the gas pump is connected with a one-way valve through a gas connecting pipeline; the one-way valve is connected with one end of a recharging pipeline, and the other end of the recharging pipeline is connected with the external gas storage tank in a sealing mode; and recovered and compressed sulfur hexafluoride tail gas is conveyed to the external gas storage tank for storage. The tail gas recovery device can achieve zero discharge of the sulfur hexafluoride test tail gas, and has the advantages of high portability, high recycling capacity and wide application range.

Disclosed herein is an apparatus for continuously producing and pelletizing gas hydrates. The apparatus includes a gas supply unit, a water supply unit and a reactor. Gas and water are respectively supplied from the gas supply unit and the water supply unit into the reactor. The gas and water react with each other in the reactor. The reactor includes a dual cylinder unit which forms a gas hydrate in such a way as to squeeze a slurry of reaction water formed by the reaction between the gas and water. The dual cylinder unit includes an upper cylinder, a lower cylinder and a connection pipe which connects the upper cylinder to the lower cylinder. The connection pipe has passing holes through which the reaction water in the reactor flows into and out of the connection pipe.

The invention discloses a separating and purifying system for sulfur hexafluoride and carbon tetrafluoride. The system comprises a mixed gas recovering pipeline which is respectively connected with a circulating purifying pipeline, a sulfur hexafluoride purifying pipeline and a carbon tetrafluoride purifying pipeline. The system can be used for overcoming the defect that marketed sulfur hexafluoride gas recovering and purifying devices cannot separate and purify carbon tetrafluoride gas, not only separating and purifying sulfur hexafluoride and carbon tetrafluoride respectively but also integrating recovery, respective separation and purification and re-filling of gases, and has the characteristics of complete function, simplicity in operation, economy and practicality and the like.

The invention relates to a method for synthesizing thionyl chloride which takes a crude thionyl chloride product as an initial point. The method is a totally closed circulating process comprising the following steps: other materials in the synthesized crude thionyl chloride product is used to react with sulfur so as to mainly produce a sulfur monochloride product; the other materials comprises sulfur monochloride, sulfur dichloride, thionyl chloride, a small amount of chlorine and sulfur dioxide; and then the sulfur monochloride product is used to synthesize thionyl chloride together with chlorine, sulfur dichloride, and a gas product from the condenser after thionyl chloride synthesis and the crude product purification process.

The invention relates to a gas recovery and reinflation device, which is a recovery and reinflation device of the sulfur hexafluoride gas used for the electric device, comprising a gas line part and an electric control part; wherein, the gas line part includes a hand valve, a normal closed electromagnetic valve, a filter decompressing valve, a decompressing valve, a safety valve and a one-way valve, furthermore, a digital display vacuum meter, an air pressure meter, a vacuum pump, a buffer tank, an absorbing device, a cooling fan, an air dividing device and recovery reinflation and vacuum extraction gas line formed by an air compressor; whereas, the electric control part comprises an alternating contactor, a power relay and a trapezoid control circuit formed by a programmable controller and so on. Besides, by controlling the alternating contactor and the power relay, the opening and the closing of partial valves of the gas line and the work state of the air compressor and vacuum pump are adjusted, realizing the process of recovery and reinflation of the sulfur hexafluoride and the vacuum extraction. Avoiding the possibility of the accident caused by frequent hand operation in the existing recovery device, the invention provides a new small recovery and reinflation device which has easy operation and can perform primary process to the sulfur hexafluoride gas.

A process for recovering SF6 from electric distribution equipment includes adsorbing the gas mixture containing SF6 in said electric distribution equipment, liquefying the gas mixture to obtain liquefied SF6, and evaporating it to obtain high-purity SF6 gas. Its apparatus is composed of washing filter, compressor, and water pool, which are serially communicated.

The invention relates to a method and equipment for refining sulfoxide chloride. A saturated vapor raw material enters a heater and is heated into a superheated gas in the heater; the superheated gas enters a fixed-bed reactor and subjected to decomposition reaction by contacting with an activated carbon bed layer in the fixed-bed reactor; the gas enters a cooler after being reacted to be cooled into saturated liquid, and the saturated liquid enters a rectifying tower; gas-solution mass transfer is carried out in the rectifying tower; and sulphone chloride, sulfur dioxide and chlorine are collected on a tower top, and high-purity sulfoxide chloride products are collected at a tower bottom. According to the invention, the purity of the sulfoxide chloride is more than 99.7%, and the content of the sulphone chloride is lower than 0.3%.

The invention provides a tail gas recovery device based on a pressure balance control method. The device comprises a surge flask, a primary recover flask and a primary recovery compressor, wherein a micro differential pressure transducer is arranged on the surge flask; at least a gas inlet pipe is connected at a gas inlet of the surge flask; a gas outlet of the surge flask is connected with a gas inlet of the primary recovery compressor by a first high pressure pipe; an electromagnetic proportional valve is arranged on the first high pressure pipe; a gas outlet of the primary recovery compressor is connected with a gas inlet of the primary recover flask by a second high pressure pipe; a first electromagnetic valve is arranged on the second high pressure pipe. The device has a simple structure, is easy to operate and control, has small volume and light weight, completely eradicates the adverse effects of sulfur hexafluoride emitted in test processes and decomposition products of sulfur hexafluoride on environments and human bodies, achieves zero emission and recycling of sulfur hexafluoride, has economic, environmental and safety triple benefits and can be broadly applied to collection of toxic tail gases or environment polluting tail gases generated in a laboratory environment or after detection by industrial field instruments.

The invention discloses a system and method for rapid recovery of mixed insulation gas. The system comprises a pretreatment module, a mixed gas membrane separation module, a SF6 liquefaction and storage module and an exhaust gas treatment module. The method comprises feeding mixed insulation gas treated by the pretreatment module into the mixed gas membrane separation module, carrying out initial separation on SF6 and N2 through selective permeability of a separation membrane, further purifying the high concentration SF6 gas subjected to initial separation through a secondary membrane, carrying out liquid storage in a storage tank, feeding N2 subjected to initial separation into the exhaust gas treatment module, carrying out innocent treatment so that the N2 satisfies the safe discharge requirements and carrying out evacuation. The system and method have good separation effects on SF6 gas, acquire separated SF6 gas having very low N2 content, continuously store a large amount of liquid SF6 and reduce a use amount of containers for storing and recovering gas SF6, recovery difficulty, work load and the cost of equipment, materials and transportation.

The invention discloses a device and method for separating and purifying mixed gas of sulfur hexafluoride and nitrogen, relates to a device and method for separating and purifying mixed gas and solves the problems that in the prior art the mixed gas of SF6 and N2 cannot be separated and SF6 cannot be recycled. The device is composed of a mixed gas inlet pipe, a buffer tank, a dryer, a pressure sensor, a mesh type filter, a compressor, an air cooler, a heat exchanger, a refrigerating machine unit, a rectifying tower, a purifying tank, a lye tank, a vacuum pump, a liquid filling machine and a gas outlet pipe. The method comprises the following steps: recycling the mixed gas into the purifying tank, solidifying SF6, pumping out N2 from the purifying tank, heating SF6 in the purifying tank, filling SF6 in the purifying tank and testing the quality of the SF6 after treatment. The device and method disclosed by the invention are used for separating and purifying the mixed gas of sulfur hexafluoride and nitrogen.

The invention relates generally to processes for the production of high-basicity and ultr-high basicity polyaluminum chlorides including aluminum chlorohydrate. The processes can produce products of a wide range of basicities and are particularly useful in producing high basicity products. The process can produce a wide range of solution concentrations and are particularly useful in producing high solution concentrations. The processes described generate high purity products, which are free of by-product salt(s). The processes described herein can also be utilized to produce enhanced efficacy polyaluminum chlorides including aluminum chlorohydrate. When compared to conventional processes for manufacturing these compounds the processes disclosed herein are unique in so far as the disclosed processes do not require aluminum metal as a starting material. The products of the processes are suitable in applications including water purification, catalysts, and antiperspirants. In addition, the invention is directed to the products prepared by the processes described herein.

A process for producing BrSF₅ includes providing a first reactant including a metal fluoride of fluorine and a metal M selected from the group consisting of alkali metals, alkaline earth metals, and Ag, providing a second reactant including BrF₃, combining the first reactant and the second reactant to form a mixture, wherein the first reactant and the second reactant are allowed to contact for a period of time sufficient to produce MBrF₄ in an amount stoichiometrically equivalent to a quantity of BrF₃, and providing a third reactant including SF₄, wherein the third reactant reacts with MBrF₄. The process for producing BrSF₅ can further include providing a fourth reactant including Br₂, wherein the fourth reactant is provided before, during and/or after providing the first reactant, the second reactant and/or the third reactant. BrSF₅ is produced in a yield of from about 50% to about 99.99% based on the amount of SF₄.

The invention provides a purification method of a crude sulfur hexafluoride product. The purification method comprises the following steps: cracking to remove impurities; washing to remove impurities;performing alkali washing to remove impurities; performing low-pressure adsorption; performing high-pressure adsorption; performing rectification to remove impurities. One to six stages of water washing towers are arranged, fluorine gas, low-sulfur fluoride and thionyl fluoride in the crude sulfur hexafluoride are effectively removed through multiple times of water washing, the purity of the sulfur hexafluoride is improved, meanwhile, by-product hydrofluoric acid in the water washing process is recycled, generation of waste water is reduced, and waste is turned into wealth. The one to six stages of alkaline washing towers are arranged, HF, CO2 and SO2 gas in sulfur hexafluoride is effectively removed through multiple times of alkaline washing, the purity of sulfur hexafluoride is improved, waste liquid generated by the alkaline washing towers is recycled after being treated with quick lime in an alkaline liquid collecting tank, generation of the waste liquid is avoided, pollution is reduced, and cost is saved.

The invention relates to a multistage distillation method for thionyl chloride with high purity. A crude product of the thionyl chloride with the purity of about 70 percent can be purified to more than 99.6 percent by adopting the multistage purification method by steps.

The invention discloses a movable type sulfur hexafluoride and carbon tetrafluoride mixed gas quick recovery device which comprises a mixed gas recovery system, a mixed gas separation system, a refrigerating unit, a sulfur hexafluoride special compressing and charging system, a carbon tetrafluoride special compressing and charging system and a vacuum-pumping system. The movable type sulfur hexafluoride and carbon tetrafluoride mixed gas quick recovery device realizes functions of the field quick recovery of a mixed insulating gas, the simple separation of a mixed gas, the storage of a separated gas, and the like. A CF4 (carbon tetrafluoride) special high-pressure compressor and an SF6 (sulfur hexafluoride) liquid filling machine which are applied in a process can greatly reduce the volumes of storage containers. Thus, the movable type sulfur hexafluoride and carbon tetrafluoride mixed gas quick recovery device solves problems that a recovery velocity of a gas is slow and the quantity of the storage containers is large when mixed insulating electrical equipment is inspected and repaired; the inspection and repair efficiency of the mixed insulating electrical equipment is improved; furthermore, the separate storage of the mixed insulating gas is also beneficial to the purification and regeneration work of the mixed insulating gas.

The invention provides a purification, separation and purification device for mixed gas of sulfur hexafluoride and nitrogen gas and a sulfur hexafluoride recovery, purification and purification method. A liquid outlet of a liquid nitrogen storage tank passes through a second cooling medium passage, a first cooling medium passage and a dry-type shell-and-tube heat exchanger sequentially and is connected with a nitrogen gas outlet, liquid nitrogen, as a cooling medium, flows out of the liquid nitrogen storage tank, then, passes through a solidifying tank, a liquefaction tank and the dry-type shell-and-tube heat exchanger sequentially and finally is discharged in a gas state, high-temperature gas discharged from a compressor is forcibly cooled in the dry-type shell-and-tube heat exchanger, pressurized gas SF6 can be relatively easily liquefied and then flows into the solidifying tank for low-temperature solidifying. According to the device and the method, the purification, separation andSF6 purification of SF6/N2 mixed gas are achieved, the recovery rate of SF6 is high, nitrogen gas come from the solidifying tank can be further utilized, cold energy of the liquid nitrogen is fully utilized, and the process is environmentally friendly, energy-saving and emission-reducing, so that the device and the method have extremely high economic and environmental benefits.

The invention provides a method and device for online micro water treatment of SF6 electrical equipment. According to the method, by conducting circulating drying and decomposer filtration on air in an air chamber of the SF6 electrical equipment, shut down maintenance of the SF6 electrical equipment can be avoided. The device comprises a machine body, wherein a ventilation connector (1), a first electromagnetic valve (3) and a second electromagnetic valve (4) are arranged in the machine body, one end of the ventilation connector (1) is connected with the first electromagnetic valve (3) and the second electromagnetic valve (4) through air inlet and outlet tube sets respectively, and the other end of the ventilation connector (1) is connected with an external air chamber; a micro water detector (2) is connected to the air outlet tube set, and an air circulating drying unit is further arranged in the machine body and connected between the air outlet end of the first electromagnetic valve (3) and the air inlet end of the second electromagnetic valve (4) through an air pipe. The method and device are suitable for the field of micro water drying of the SF6 electrical equipment.