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Membrane refining process of medicinal sodium chloride

A technology of sodium chloride and membrane method, applied in the field of refining process of medicinal sodium chloride, can solve the problems of low production efficiency, long time-consuming, product quality decline, etc., and achieves prolonging the brushing cycle, reducing production costs, and resisting pollution. powerful effect

Active Publication Date: 2014-01-01
JIANGSU JIUWU HITECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above process has the following technical problems: (1) when sodium carbonate is added, part of the barium sulfate will re-dissolve, which may eventually affect the quality of medicinal salt; The time is long, the production efficiency is low, and after adding flocculant, new impurities will be introduced into the system, resulting in a decline in product quality; natural sedimentation needs to occupy a large area; (3) using sintered titanium microporous filter for fine filtration, not only The filtration accuracy is not enough, and the terminal filtration method has the disadvantage of rapid flux attenuation; (4) The treatment process is open, which is easily contaminated by bacteria, which makes medical sodium chloride prone to medical risks when used

Method used

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  • Membrane refining process of medicinal sodium chloride

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Experimental program
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Effect test

Embodiment 1

[0038] 1. The sodium chloride content in saturated brine is 285g / L, the calcium content is 0.78g / L, the magnesium content is 0.10g / L, the sulfate content is 1.6g / L, and the suspended matter content is 1.05g / L. Add 3.47g / L of barium chloride solid into the front reaction tank, let it stand for 1h after mechanical stirring, intercept large particles of mechanical impurities through the screening device, and then carry out cross-flow filtration through the inorganic first membrane filter to remove the impurities in the feed liquid. Suspended solids and sulfate ions were sampled and tested, and the barium content was 82mg / L, the sulfate content was 0.86mg / L, and the SS content was ≤0.5mg / L. The pore size of the inorganic first membrane filter is 20nm, the filtration temperature is 75°C, the membrane surface flow velocity is 2m / s, the operating pressure is 0.2Mpa, and the stable flux of cross-flow filtration is about 269 L / m -2 h.

[0039]2. After passing through the first inorgan...

Embodiment 2

[0046] 1. The sodium chloride content in saturated brine is 285g / L, the calcium content is 0.78g / L, the magnesium content is 0.10g / L, the sulfate content is 1.6g / L, and the suspended matter content is 1.05g / L. Add 3.47g / L of barium chloride solid into the front reaction tank, let it stand for 1h after mechanical stirring, intercept large particles of mechanical impurities through the screening device, and then carry out cross-flow filtration through the inorganic first membrane filter to remove the impurities in the feed liquid. Suspended solids and sulfate ions were sampled and tested, and the barium content was 82mg / L, the sulfate content was 0.86mg / L, and the SS content was ≤0.5mg / L. The pore size of the inorganic first membrane filter is 20nm, the filtration temperature is 75°C, the membrane surface flow velocity is 2m / s, the operating pressure is 0.2Mpa, and the stable flux of cross-flow filtration is about 267 L / m -2 h.

[0047] 2. The clear liquid through the inorganic...

Embodiment 3

[0054] 1. The sodium chloride content in saturated brine is 285g / L, the calcium content is 0.78g / L, the magnesium content is 0.10g / L, the sulfate content is 1.6g / L, and the suspended matter content is 1.05g / L. Add 3.47g / L of barium chloride solid into the front reaction tank, let it stand for 1h after mechanical stirring, intercept large particles of mechanical impurities through the screening device, and then carry out cross-flow filtration through the inorganic first membrane filter to remove the impurities in the feed liquid. Suspended solids and sulfate ions were sampled and tested, and the barium content was 82mg / L, the sulfate content was 0.86mg / L, and the SS content was ≤0.5mg / L. The pore size of the inorganic first membrane filter is 20nm, the filtration temperature is 75°C, the membrane surface flow velocity is 2m / s, the operating pressure is 0.2Mpa, and the stable flux of cross-flow filtration is about 268 L / m -2 h.

[0055] 2. After the clear liquid of the inorgani...

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Abstract

The invention discloses a membrane refining process for medicinal sodium chloride. The membrane refining process comprises the following steps: leading brine or crude salt water saturated by melting salt into a front reaction tank, adding barium chloride into the front reaction tank, filtering through a large-mesh filter after reaction, and removing sulfate radical through a first membrane filter; leading the sulfate radical-removed clear liquid into a rear reaction tank, adding sodium hydroxide and sodium carbonate into the rear reaction tank, and leading the solution into a second membrane filter after complete reaction so as to remove calcium and magnesium; leading the calcium and magnesium-removed clear liquid to an acid regulating tank, and adding hydrochloric acid to adjust the pH, so as to obtain refined salt water; producing the medicinal sodium chloride by an evaporation method, wherein the obtained medicinal sodium chloride has the advantages that the concentration of SS is less than or equal to 1mg / L, the total concentration of Ca<2+> and Mg<2+> is less than or equal to 1 mg / L, and the concentration of SO4<2-> is less than or equal to 20 mg / L. According to the membrane refining process, a two-stage membrane filtration method is adopted, no flocculant is added, the process is continuous, the operation is simple, the treatment capacity is large, the pollution resistance is high, and the quality of the medicinal salt is obviously improved after evaporation and crystallization.

Description

technical field [0001] The invention relates to a refining process of medicinal sodium chloride, in particular to a membrane refining process of medicinal sodium chloride. [0002] Background technique [0003] The raw material of medicinal sodium chloride can be brine, sea salt or refined salt. Crude brine contains Ca 2+ , Mg 2+ , SO 4 2- Inorganic impurities such as bacteria, algae residues, humic acid and other natural organic and mechanical impurities, these impurities will be brought into the brine when salting, if not completely removed, it will affect the preservation and quality of sodium chloride. In terms of high-grade sodium chloride, it does not meet the requirements for medicinal use. [0004] The main technological process currently adopted by domestic pharmaceutical salt production enterprises is as follows: After coarse salting, calculate the required content of barium chloride, sodium carbonate, and sodium hydroxide according to the content of calcium,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14
Inventor 彭文博曹恒霞王肖虎张桂花张建嵩张宏范克银
Owner JIANGSU JIUWU HITECH
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