13results about "Amidosulfonic acid" patented technology

The application provides a method for recycling calcium sulfate in lithium mica production of lithium carbonate, and belongs to the technical field of smelting.The lithium mica is calcined with the calcium sulfate clinker, the pressure filtration residue after the lithium ion is leached by water is put into an aqueous sulfamate solution and is stirred again, the calcium sulfate in the residue is reacted with the sulfamate and is dissolved, ion exchange is carried out through a sodium type ion exchange resin, backwashing and precipitation processes are carried out, the calcium sulfate is generated again, and the calcium sulfate is returned as a lithium mica auxiliary material, so that the recycling of the calcium sulfate is realized, and the treated filter residue is used as a mixed material and does not affect the performance of the prepared cement.The process can significantly improve the consumption amount of the lithium mica residue in the cement industry, saves the land resources occupied by the stacking or landfill of the lithium mica residue, reduces the environmental protection pressure, and has a wide application prospect.

The application relates to a purification method of a bifluorosulfonylimide lithium salt, comprising the following steps: modifying a polytetrafluoroethylene film by using plasma and formic acid, immersing the polytetrafluoroethylene film in bifluorosulfonylimide acid after the modification is completed, heating and drying to obtain a modified polytetrafluoroethylene film; dispersing lithium carbonate in dimethyl carbonate, then adding bifluorosulfonylimide acid, obtaining a reaction liquid after the reaction is completed, filtering the reaction liquid to obtain a filtrate, concentrating the filtrate once to obtain a bifluorosulfonylimide lithium electrodialysis crude solution; using the modified polytetrafluoroethylene film to purify the bifluorosulfonylimide lithium electrodialysis crude solution by electrodialysis, then concentrating and crystallizing the obtained electrodialysis liquid to obtain battery-grade bifluorosulfonylimide lithium. The method provided by the application can reduce the purity requirement of raw material lithium carbonate from battery grade to industrial grade, which is beneficial to industrial production.

The present disclosure relates to a lithium-ion-conducting material and a purification method therefor, and provides a lithium-ion-conducting material, which comprises lithium sulfonimide represented by the following general formula (I), wherein X and Y may be the same or different, and are each independently CmF2m+1 (m≥0). Further provided is a purification method for the lithium-ion-conducting material. The method of the present disclosure provides a lithium sulfonimide lithium-ion-conducting material having a high purity.

The invention discloses a preparation method of nickel aminosulfonate, and relates to the technical field of nickel-containing chemical production, and the method comprises the following specific steps: multi-element metal pretreatment: mixing and ball-milling nickel, aluminum and magnesium powder, adding an acyclic boroxane-containing aqueous solution, and carrying out ultrasonic treatment to form a suspension; a reaction system is constructed by mixing the suspension liquid, sulfamic acid and an acyclic organic phosphorus compound, a segmented stirring reaction is carried out under the conditions of oxygen introduction and proper temperature and humidity, programmed crystallization and cooling are carried out to form wet crystals, and nickel sulfamic acid is finally prepared through segmented vacuum drying; through collaborative design of multi-metal pretreatment and a reaction system, reaction preparation and proportion are optimized, reaction activity and conversion rate are improved, and side reactions are reduced; and by matching with segmented stirring, substance transfer is promoted, the product purity is guaranteed, program crystallization and segmented vacuum drying are combined, crystal growth and drying conditions are controlled, impurities are removed, the product purity, stability and production efficiency are improved, and the large-scale production requirement is met.

This invention discloses an apparatus for the continuous production of bis(fluorosulfonyl)imide intermediates. The apparatus includes a feed mixer with liquid and gas feed ports. The outlet of the feed mixer is connected to the top of a coil reactor via a pipe and is also connected to the inlet of the coil inside the reactor. The outlet of the coil connects from the bottom of the reactor to the top of a separator. A cooling tank is provided outside the coil. The separator has a by-product outlet at the top and a product outlet at the bottom. A steam heater is also provided inside the separator. This apparatus can directly separate the product and by-product, thereby achieving the goal of continuous production of bis(fluorosulfonyl)imide intermediates, increasing production scale and capacity, and ensuring smooth production operation. Furthermore, this apparatus can recover and reuse unreacted raw materials and solvents during the production process, reducing production costs.

This invention proposes an environmentally friendly and efficient method for preparing aminosulfonic acid, belonging to the field of chemical technology. It includes: (1) sulfonation reaction; (2) crude product filtration; (3) dissolution and crystallization; and (4) drying and packaging. The reaction process of this invention features mild reaction conditions, short reaction time, and a yield exceeding 97%. The process, using fuming sulfuric acid and urea at a lower temperature, significantly reduces polluting components in the waste gas. It has many advantages, including simple operation, low cost, high yield, and greater environmental friendliness.

The present invention addresses the problem of suppressing the influence of a sulfur component derived from a salt of an electrolyte solution when recovering a positive electrode active material from a positive electrode mixture. The present invention provides a method for recycling a lithium ion battery using LiFSI as a salt of an electrolyte solution, the method comprising: a treatment agent mixing step for mixing lithium carbonate with a positive electrode mixture recovered from a waste lithium ion battery; and a heating step for heating a mixture obtained by mixing lithium carbonate with the positive electrode mixture to a heating temperature that is equal to or higher than the melting point of LiFSI and equal to or lower than the melting point of lithium carbonate.

The invention relates to a purification technology of bis (chlorosulfonyl) imide containing chlorosulfonic acid impurities, and provides a purification method of bis (chlorosulfonyl) imide, which is simple to operate and can give consideration to both high purity and higher yield in the process of purifying bis (chlorosulfonyl) imide containing chlorosulfonic acid. The purification method comprises the following steps: (1) supercooling a bis (chlorosulfonyl) imide solution containing chlorosulfonic acid impurities to obtain a supercooled solution; (2) continuously dropwise adding the supercooled solution onto a conveyor belt from a liquid outlet positioned above the conveyor belt, and simultaneously meeting the following conditions in the dropwise adding process: the dropwise adding flow F of the supercooled solution is 0.1-1L / min, and the linear velocity V of the conveyor belt is 0.01-1m / s, the height difference h between the liquid outlet and the surface, used for receiving the dropwise added supercooled solution, of the conveying belt is 0.1-1m; the A value calculated according to the following relational expression needs to be controlled between 5 and 30: A = F / V / (h / 4.9) 0.5; and (3) carrying out solid-liquid separation on the solid-liquid mixture.

The invention relates to a method for electrochemical synthesis of bis (fluorosulfonyl) imide alkali metal salt. The method comprises the following steps that under the action of an external electric field, alkali metal cations penetrate through the cation exchange membrane to enter the product chamber (2), bis (fluorosulfonyl) imide anions penetrate through the anion exchange membrane to enter the product chamber (2), and the alkali metal cations and the bis (fluorosulfonyl) imide anions in the product chamber (2) are combined to form bis (fluorosulfonyl) imide alkali metal salt. The bis (fluorosulfonyl) imide alkali metal salt prepared by the method has extremely high purity and hardly contains other water-soluble impurities, so that the synthesis steps are simplified, and the subsequent purification process is greatly simplified.

The application provides a treatment method of bisfluorosulfone imide heavy residue, which comprises the following steps: reacting a raw material system comprising bisfluorosulfone imide heavy residue and an acidic aqueous solution to obtain a fluorine-containing acid liquid and an amino sulfonic acid crude product; wherein the fluorine-containing acid liquid can be used as a by-product acid to save treatment costs; the amino sulfonic acid crude product can also be directly sold as a product to reduce treatment costs, bring economic benefits, and realize resource recycling of the bisfluorosulfone imide heavy residue.

The application discloses a preparation method of high-purity low-water lithium bisfluorosulfonimide, and the method comprises the following steps: S1, dissolving the lithium bisfluorosulfonimide crude product in an organic solvent to obtain solution A; S2, adding a water removal agent to the solution A to obtain solution B; S3, adding activated carbon to the solution B, stirring, filtering, concentrating the filtrate, crystallizing, and drying to obtain the high-purity low-water lithium bisfluorosulfonimide product; or the method comprises the following steps: S1, dissolving the lithium bisfluorosulfonimide crude product in an organic solvent to obtain solution C; S2, adding activated carbon powder to the solution C, stirring, filtering, pumping the filtrate into a lithium molecular sieve column, filtering the received solution again, concentrating the filtrate, adding anhydrous dichloromethane to crystallize, and drying to obtain the high-purity low-water lithium bisfluorosulfonimide product. The method is simple in operation and low in cost, the lithium bisfluorosulfonimide obtained by the method has a very low water content and is high in purity.

The application relates to the technical field, in particular to a sulfamic acid preparation device and a preparation method, which comprise a box body, a cleaning assembly and an in-out material assembly; the cleaning assembly comprises a cleaning shaft, rotating seats, transmission rods, scraping strips and mixing plates; the cleaning shaft is rotationally connected with the box body and penetrates through the box body; two rotating seats are fixedly connected with the cleaning shaft and are respectively arranged in the interior of the box body; a plurality of transmission rods are fixedly connected with the rotating seats and are respectively arranged on the outer sides of the rotating seats; four scraping strips are fixedly connected with the transmission rods and are respectively arranged in the middle of the transmission rods; the number of the mixing plates is four; four mixing plates are fixedly connected with the transmission rods and are respectively arranged in the middle of the transmission rods; and the in-out material assembly is connected with the box body, so that the problems that calcium sulfate and calcium carbonate scale bodies are easily formed in a reaction system, are attached to the inner wall of a reaction kettle and pipelines, heat transfer efficiency is reduced by more than 30%, the cleaning period of the equipment is shortened to 7-10 days, and the maintenance cost is increased are solved.

The present application relates to the technical field of chemical product purification, and particularly relates to a purification device and purification method for sulfamic acid, which comprises at least two cooling crystallization units arranged in series, each cooling crystallization unit comprises a crystallization container, a heat exchange assembly, a disturbance assembly and a temperature control unit, through the synergistic effect of the multi-stage cooling crystallization units and the independent temperature control units, the gradient fine temperature control of the sulfamic acid solution is realized, and the product purity is improved. A plurality of groups of heat exchange pipes arranged in parallel significantly increase the effective heat transfer area, and the solution turbulence and heat transfer efficiency are strengthened under the synergistic stirring of the disturbance assembly, and the energy consumption is reduced. At the same time, the disturbance effect effectively inhibits the adhesion and scaling of the crystals on the heat exchange surface, and the continuous production cycle is significantly prolonged in combination with the stable operation of the temperature control unit. By using the above structure, the high-efficiency, energy-saving and continuous industrial production target is realized while ensuring high purity.