73 results about "Chlorine production" patented technology

The utility model relates to a refining method of by-product HCl gas in organic chlorine production process, the by-product HCl gas passes by the absorption post filled with absorption resin at flow speed of 0.1-0.5m/s under constant-temperature constant-pressure, the removal ratio of the organic in the HCl gas can reach 99.8 percent, afterwards the absorption resin that absorbs the organic is desorbed by 110-160 DEG C saturation vapor, the desorption ratio can exceed more than 99 percent, the desorption liquid is condensed, oil-gas separated, recycled to obtain the organic mixture containing benzene or chlorobezene, the mixture is furthermore distilled and separated to obtain the benzene or chlorobezene, finally the absorption resin after desorbed by the vapor is dried by 110-140 DEG C hot air, and then cooled to room temperature for next stage absorption. The absorption resin can be reused after desorption and regeneration.

A catalyst has high activity and is suitable for use in producing chlorine by oxidizing hydrogen chloride with oxygen. The catalyst includes copper, an alkali metal and a rare earth and has pores of which pores having a diameter of 5 to 15 nm have a pore volume of 0.4 to 2.0 ml/g.

The invention relates to an electrode formulation comprising a catalytic layer containing tin, ruthenium, iridium, palladium and niobium oxides applied to a titanium or other valve metal substrate. A protective layer based on titanium oxide modified with oxides of other elements such as tantalum, niobium or bismuth may be interposed between the substrate and the catalytic layer. The thus obtained electrode is suitable for use as an anode in electrolysis cells for chlorine production.

The invention provides a desulfurization wastewater treatment system. The system comprises a softening pretreatment unit, a membrane salt-separation concentration unit and an electrolytic chlorine-production unit, wherein the softening pretreatment unit is used to remove hardness, solid suspended matters and heavy metal ions in a desulfurization wastewater; the membrane salt-separation concentration unit is used to carry out monovalent salt and divalent salt separation and deep concentration separation on the wastewater subjected to the softening pretreatment unit; and the electrolytic chlorine-production unit is used to carry out electrolytic chlorine production on the concentrated wastewater produced by the membrane salt-concentration unit. The system can further comprise a hydrogen purification and recovery unit, and the hydrogen purification and recovery unit comprises a chlorine removal apparatus, a water removal apparatus, a deoxidization apparatus and a pressure-swing temperature-changing adsorption apparatus, high purity hydrogen gas is generated and transported to a hydrogen cooling system of an electric generator. On the basis of realizing zero discharge, products of eachlink are rationally treated and recycled according to the technical scheme of the system, the wastewater treatment efficiency is improved, the resource cost is reduced, and the purpose of resource comprehensive utilization of the desulfurization wastewater is achieved.

The reactor for chlorine production of the present invention is a multi-tubular heat exchange type reactor used when chlorine is produced by oxidizing hydrogen chloride, and is characterized in that the shell of the reactor is divided into a plurality of regions in the direction of the tube axis by partitions. In each zone, a heat transfer medium is circulated, and at least one temperature control device for the heat transfer medium is provided. The temperature control device is composed of a cooler and/or a heater. In the direction from the inlet to the outlet of the reactor reaction tube, the layer Filled with catalysts with different catalytic activities, the catalyst is a ruthenium oxide catalyst, filling less than 40% of the total amount of ruthenium in the area from the entrance of the reaction tube to less than 50%, and filling 60% of the total amount of ruthenium in the area of ​​50% to 100%. %above. In addition, the method for producing chlorine according to the present invention is characterized in that the chlorine production reactor is used, hydrogen chloride-containing gas and oxygen-containing gas are supplied to the chlorine production reactor, and at a pressure of 0.1 to 1 MPaG and a temperature of 200 to 500°C, Hydrogen chloride is oxidized with oxygen.

The invention relates to a swimming pool water chlorine production control method. The swimming pool water chlorine production control method comprises the following steps of performing initialization to determine a swimming pool sterilization effect-achieved daily required total chlorine production amount; collecting water temperature and velocity data; according to the velocity data, determining whether to start or stop a sodium hypochlorite generator; collecting the working voltage and current data of the sodium hypochlorite generator, processing the water temperature and velocity data and the voltage and current data; computing a current chlorine production amount; comparing the current chlorine production amount with the swimming pool sterilization effect-achieved daily required total chlorine production amount, if the current chlorine production amount is smaller than the swimming pool sterilization effect-achieved daily required total chlorine production amount, performing feedback to continuously collect data, and if not, stopping the sodium hypochlorite generator. The swimming pool water chlorine production control method helps intelligently control the chlorine production in a swimming pool according to hydrochemical theories, thereby achieving accurate control to the chlorine production of the swimming pool when the swimming pool achieves sterilization effects.

The invention discloses graphene modified metal oxide anode material and a preparation process. The graphene modified metal oxide anode material is characterized in that an active coating coats a titanium substrate, the active coating comprises RuO2, IrO2, SnO2, Sb2O3 and graphene, and coating liquid of the active coating comprises, by weight, 10-30% of Ru, 20-60% of Ir, 10-30% of Sn, 10-30% of Sband 0.1-10g/L of the graphene, wherein the total concentration of metal ions of the coating liquid is 0.10 to 0.35mol/L and the coating loading amount is larger than or equal to 10g/m<2>. Electrolysis efficiency of the anode coating in low-temperature seawater of 5 DEG C can be higher than 70%; and electrolysis efficiency of electrolysis chlorine production in the seawater with 10-20 PSUs of thelow-temperature seawater is more than or equal to 85%, and the accelerated electrolysis life is longer than or equal to 480 hours. In addition, the graphene is added into the coating, so that the bonding force between the coating and the substrate is improved, the passivation speed of the titanium substrate is relieved, stability of the coating is improved, and the service life of the coating is prolonged.

A catalyst having decreased activity is subjected to a contact treatment with a reducing gas containing carbon monoxide and/or hydrogen. Also, the catalyst can be effectively activated by being treated by contacting with an oxidizing gas after having been treated by contacting with the reducing gas. As the catalyst for production of chlorine, a ruthenium catalyst, particularly a catalyst containing ruthenium oxide is suitably activated.

The invention relates to a process for the preparation of isocyanates in a system network comprising an isocyanate production plant, a chlorine production plant and a phosgene production plant, in which carbon dioxide formed as a by-product is partially to completely condensed out with the gaseous chlorine formed in the chlorine production plant and enters into the phosgene preparation process and, after the preparation of phosgene, the predominant part of the carbon dioxide formed is thereby sluiced out of the system network in gaseous form.

The disclosed manufacturing method of titanium oxide electrode comprises: preparing starting materials for titanium oxide, heat-treating the starting materials of titanium oxide, and electro-reducing the heat-treated starting materials of titanium oxide. According to this method, an anode having excellent active oxygen species production efficiency and excellent electrical properties can be manufactured using inexpensive titanium oxide.

The invention discloses a device for absorbing hydrogen chloride in a hydrogen chloride catalytic oxidation chlorine production process gas. The device comprises a falling film absorber, a packing tower, a hydrochloric acid pump and a graphite heat exchanger, wherein a process gas inlet, a diluted acid inlet, a primary absorbed process gas outlet and a condensate outlet of the falling film absorber are made of tantalum; an absorbed water inlet, a primary absorbed process gas inlet, a secondary absorbed process gas outlet and a diluted acid outlet of the packing tower are made of tantalum; theupper sealing head of the falling film absorber, the lower sealing head of the falling film absorber, an upper packing tower absorber sealing head, a packing tower absorber cylinder and a lower packing tower absorber sealing head are made of steel lined organic silicon steeped impermeable graphite; a fixing tube plate, an absorption tube and a floating tube plate of the falling film absorber are made of organic silicon steeped impermeable graphite; the falling film absorber cylinder is made of stainless steel; the packing is ceramic plate corrugated or high-silicon ceramic packing. The deviceis capable of effectively absorbing hydrogen chloride in process gases and can be used for a long time as a part in contact with a corrosive liquid has a corrosion resistant function.

Low chlorine, multi-staged method for producing cycloaliphatic diisocyanates. The invention relates to a multi-staged method for the continuous low-chlorine production of cycloaliphatic diisocyanates, comprising the synthesis of diaminodipheynl alkanes, the hydration thereof into the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines to the corresponding cycloalkylene biscarbamates and the thermal cleaving of the latter into the cycloaliphatic diisocyanates and alcohol.

The invention belongs to the technical field of electrolysis, and particularly relates to a co-production method of caustic soda and ferric orthophosphate. The co-production method comprises the following steps: preparing NaOH and ferric ions by an electrolytic method, taking a cation exchange membrane and/or a microporous membrane as a separation membrane of a cathode and an anode, taking an aqueous solution containing sodium ions as a cathode electrolyte, and taking an aqueous solution containing ferrous ions and sodium ions as an anode electrolyte; preparing ferric orthophosphate by a chemical precipitation method; by using a ferric ion solution as a raw material, adding an aqueous solution containing phosphate ions as a precipitator to generate ferric orthophosphate. Compared with the traditional chlor-alkali process, the invention has the following advantages: the caustic soda process can avoid the generation of chlorine and overcome the excessive chlorine production capacity caused by caustic soda production; the oxidation potential (0.771 V vs SHE) of Fe < 2 + > is far lower than that (1.36 V vs SHE) of chloride ions, so that the energy consumption can be reduced; so that the produced FePO4 can be used for preparing a lithium ion or sodium ion battery electrode material.

The electrolysis of aqueous sodium chloride solution in a cell (1) with an ion-selective permeable membrane produces on the one hand chlorine (16) which is converted in the chlorine production unit (6) and on the other hand produces The exhaust gas (13) of unit (5) is carbonated with aqueous sodium hydroxide solution (19), and the resulting carbonated solution (18) is evaporated to produce sodium carbonate crystals (21).

The invention provides a chlorine production catalyst that shows excellent reaction activity in the oxidation reaction of hydrogen chloride with oxygen into chlorine, is inexpensive and can be supplied stably, and is suited for use in a fluidized-bed reactor. The invention also provides a chlorine production process using the catalyst. The chlorine production catalyst of the invention includes spherical particles containing copper element (A), an alkali metal element (B) and a lanthanoid element (C) and having an average sphericity of not less than 0.80. The lanthanoid element (C) has a bond dissociation energy with oxygen at 298 K of 100 to 185 kcal/mol. The content of the copper element (A) in the catalyst is 0.3 wt % to 4.5 wt %.

A method of processing a stream of liquid chlorine containing nitrogen trichloride from a chloralkali plant. The liquid stream is received into a vaporizer in which it is evaporated 1O1 chlorine gas and nitrogen trichloride gas. The gas stream is processed by destroying the nitrogen trichloride gas, for example in a superheater or a catalytic bed. The processed gas stream is recycled to the chlorine production train of the chloralkali plant. The process avoids the use of organic solvents to decompose the nitrogen trichloride and the creation of a waste stream requiring further handling.

The invention provides an electrochemical ammonium micro-nano reactor, a preparation method of an anode material thereof and ammonium removal application, and belongs to the technical field of sewageammonium removal. The electrochemical ammonium micro-nano reactor comprises an anode material and a cathode material, wherein the anode material and the cathode material are respectively connected with an anode and a cathode of a direct current power supply; a first support plate is provided with a first groove, and the anode material is arranged in the first groove; a second support plate is provided with a second groove, and the cathode material is arranged in the second groove. The anode material comprises an ammonium ion sieve material which exchanges ammonium ions from a water body to enrich the ammonium ions in the water body to an electrochemical anode; and a chloride ion adsorbent absorbing chloride ions in water. After being electrified, the chloride ions are oxidized into chlorine, the chlorine meets water to form active hypochlorite, and the chlorate oxidizes the ammonium ions adsorbed by the ammonium ion sieve into nitrogen. According to the invention, the ammonium ions insewage are adsorbed in large quantities, the chloride ions in water bodies are adsorbed, electrochemical chlorine production efficiency is increased, and cost is saved; the product is clean, the reaction is efficient, reusing can be realized, and the reaction process can be continuously carried out.

The invention discloses a chlorine buffer tank for electric power cable production, which comprises a tank body, an upper cover, an air inlet pipe and an air outlet pipe. The upper cover, two hoisting rings are symmetrically installed on the top of the upper cover, the air inlet pipe is connected above the outside of the tank, the inlet flange is installed on the inlet pipe, the outlet pipe is installed under the outside of the tank, and the outlet flange is installed on the outlet pipe , A pressure detector for detecting the gas pressure inside the tank is installed on the side of the tank, the pressure detector is connected with the controller through an electrical signal, and the controller is installed on the side of the tank. This chlorine gas buffer tank for power cable production can not only buffer the chlorine gas, but also filter the fixed particles doped in the chlorine gas to obtain refined chlorine gas, which is convenient for the use of subsequent processes and can also reduce the pressure of the tank body. Real-time monitoring to avoid safety accidents caused by excessive pressure and reduce safety hazards.

A method of safely vaporizing liquid chlorine containing high concentrations of nitrogen trichloride contaminant from a chloralkali plant. In a vertical plug-flow vaporizer having an upward flow direction, a stream of liquid chlorine containing nitrogen trichloride is received. A gas such as air, nitrogen or chlorine gas is introduced into the liquid stream upstream of the boiling zone of the vaporizer to induce a flow regime, for example annular flow or mist flow, that prevents a mass accumulation of nitrogen trichloride in the vaporizer. The liquid chlorine containing nitrogen trichloride is vaporized. The resulting gas stream may be processed to destroy the nitrogen trichloride and recycled to the chlorine production train.

The invention relates to the technical field of seawater treatment, and provides a raw seawater electrolytic chlorine production system and an acid pickling method, the raw seawater electrolytic chlorine production system comprises a control system, a seawater supply system, a filtering system, an electrolytic chlorine production system, a storage hydrogen discharge system, a chemical dosing system and an acid pickling system, the control system is electrically connected with the seawater supply systems, the filtering system, the electrolytic chlorine production system, the storage hydrogen discharge system, the dosing system and the pickling system, the seawater supply systems are mutually standby through communication control valves, the seawater supply systems are connected with the electrolytic chlorine production system through the filtering system, and the storage hydrogen discharge system is connected with the pickling system. The output end of the electrolytic chlorine production system is connected with the input end of the storage hydrogen discharge system, the output end of the storage hydrogen discharge system is connected with the output end of the chemical feeding system, and the acid pickling system is connected with the electrolytic chlorine production system and forms an acid pickling loop with the electrolytic chlorine production system. And the system failure shutdown and maintenance cleaning frequency is reduced, and the automation degree is high.