CN-121988254-A - Process for preparing high-purity sodium ion aqueous solution by closed cycle

CN121988254ACN 121988254 ACN121988254 ACN 121988254ACN-121988254-A

Abstract

The invention discloses a process for preparing a high-purity sodium ion aqueous solution by closed cycle, and belongs to the technical field of inorganic ionic liquid preparation. The invention takes pure water to dissolve sodium fluoride as an initial system, adds metal calcium to react to generate superfine calcium fluoride precipitate and primary sodium ion water, and takes the sodium ion water as circulating mother liquor to completely replace pure water, continuously supplements sodium fluoride and metal calcium to perform closed-loop circulation reaction. The fluorine ions and the calcium ions are directionally combined and precipitated, the sodium ions are continuously enriched in the liquid phase, the concentration is continuously increased along with the cycle times, the system always keeps a flowable liquid state, and the side reaction of calcium and water can be inhibited due to the reduction of the water activity. The invention breaks through the upper limit of the solubility of the traditional sodium salt, can obtain the ultra-high concentration sodium ion mother solution, can leave the factory after the finished product is diluted, can be permanently recycled, has the advantages of high reaction efficiency, high raw material utilization rate, no waste liquid discharge, suitability for continuous industrial production and the like, and can be widely applied to the fields of skin care, moisture preservation, mucous membrane nursing, whole body electrolyte supplementation and the like.

Inventors

CHEN HONGYIN
CHEN XUELIAN
CHEN QINGLIAN
CHEN HONGZHEN

Assignees

新疆顺安众达交通技术服务有限公司

Dates

Publication Date: 20260508
Application Date: 20260323

Claims (6)

1. A process for preparing high-purity sodium ion aqueous solution by closed cycle is characterized by comprising the steps of dissolving sodium fluoride in pure water and reacting with metal calcium to prepare primary sodium ion aqueous solution, taking the sodium ion aqueous solution as a circulating mother solution in subsequent reactions to completely replace the pure water, and carrying out closed cycle reaction by supplementing sodium fluoride and metal calcium for multiple times to enable fluorine ions and calcium ions to generate calcium fluoride precipitate, wherein sodium ions are continuously enriched in a liquid phase, so that high-concentration sodium ion aqueous solution is obtained.
2. The process according to claim 1, wherein no external pure water is added in the whole reaction process, the liquid phase environment is maintained only by circulating mother liquor, and the system is always kept in a flowable state.
3. The process of claim 1 wherein the sodium ion concentration is controlled by the number of cycles and is continuously increased as the number of cycles increases.
4. The process of claim 1 wherein the high ionic strength circulation system significantly reduces water activity and inhibits side reactions of calcium metal with water.
5. The process of claim 1 wherein the calcium fluoride precipitate is separated by sedimentation after the reaction, and the supernatant is refluxed as a circulating mother liquor which can be recycled a plurality of times.
6. The process of claim 1 wherein the finished product is made by dilution of a high concentration sodium ion mother liquor with purified water, the main body of the mother liquor remaining in the system for continuous recycling production.

Description

Process for preparing high-purity sodium ion aqueous solution by closed cycle Technical Field The invention belongs to the technical field of inorganic ion aqueous solution preparation, and particularly relates to a preparation process of a high-purity sodium ion aqueous solution which has no side reaction, closed cycle and continuous concentration. Background The traditional sodium ion aqueous solution is mostly prepared by directly dissolving sodium salts such as sodium chloride, sodium lactate and the like in pure water, and is limited by the solubility of anions, so that the concentration of sodium ions is difficult to be greatly improved, and if sodium fluoride is used as a raw material, the sodium ion aqueous solution cannot be obtained due to extremely low solubility in water. When the sodium ion water is prepared by the reaction of the metal calcium and the sodium fluoride aqueous solution, a large amount of free water in the system is easy to generate side reaction with the metal calcium to generate hydrogen, so that potential safety hazards exist, the utilization rate of raw materials is reduced, and the product is impure. The existing technology is single reaction and single discharging, the continuous enrichment of ion concentration can not be realized, the problems of agglomeration, insufficient contact, incomplete reaction and the like are easy to occur in the reaction, and the stable, efficient and continuous industrial production is difficult to realize. Disclosure of Invention The invention aims to overcome the defects of limited sodium ion concentration increase, serious metal calcium side reaction, easy agglomeration of a system, incapability of continuous circulation production and the like in the prior art, and provides a preparation process of a sodium ion aqueous solution with closed circulation, high selectivity and high concentration ratio. The technological scheme is that the closed circulation process of preparing high purity sodium ion aqua includes the following steps of 1, preparing initial solution. And taking quantitative pure water, adding sodium fluoride solid, and completely dissolving under stirring at normal temperature to obtain sodium fluoride transparent solution. 2. And (3) preparing a sodium ion mother solution through primary reaction. Slowly adding metal calcium into the sodium fluoride solution, and reacting under continuous stirring, wherein the metal calcium is preferentially combined with fluoride ions to generate superfine calcium fluoride (CaF 2) precipitate, and forming a sodium ion enrichment system in the solution to obtain a primary sodium ion aqueous solution. 3. And replacing the closed-loop circulation medium. And standing and settling the primary sodium ion aqueous solution, removing calcium fluoride sediment at the bottom, taking supernatant as circulating mother liquor to completely replace pure water to enter the next batch of reaction, and only supplementing sodium fluoride and metal calcium into the circulating mother liquor without adding external pure water in the whole subsequent production process. 4. And (5) continuously and circularly concentrating. The circulating mother liquor is repeatedly fed into the reaction tank, stirred, reacted, settled, separated and precipitated, and each cycle of circulating makes the fluoride ion be completely precipitated by calcium, and the sodium ion is continuously remained in the liquid phase so as to implement gradual raising and continuous enrichment of sodium ion concentration, and the system always remains flowable slurry or liquid, and does not crystallize, precipitate and harden. 5. And (5) storing the high-concentration mother liquor and preparing a finished product. The circulating mother liquor realizes infinite closed circulation in the reaction tank to form ultra-high concentration sodium ion stock solution, when the finished product is produced, part of the high concentration mother liquor is extracted, purified water is added according to the use requirement to dilute to proper concentration, thus obtaining the finished product sodium ion water, and the rest mother liquor is completely returned to the reaction tank and continuously used as a circulating medium to participate in the next round of reaction. 6. Solid-liquid separation and byproduct collection. The calcium fluoride generated by the reaction is ultrafine powder, can be settled and separated periodically, can be directly used as a skin care grade mild friction agent and a film forming agent, and has no solid waste. The core innovation point is 1. Closed cycle, self-production and self-use. The sodium ion water generated by the reaction is used as the only liquid phase medium to thoroughly replace pure water, thus realizing a water system without external source. 2. The upper limit of the concentration of sodium ions is broken through. The fluoride ions are completely removed by precipitation, only sodium ions and water exist in the