Method of purifying and detecting metal ion in dimethyl sulfoxide

Abstract

The present invention relates to method of purifying and detecting metal ion in dimetyl sulfoxide as the solution for polymerizing polyactylonitrile carbon fiber. The metal impurities are eliminated from dimetyl sulfoxide based on static adsorption and exchange principle, and the elimination includes eliminating iron ion from dimetyl sulfoxide with macroporous weak alkali type anion exchange resin and eliminating calcium, magnesium, sodium and potassium ions from dimetyl sulfoxide with macroporous strong base type cation exchange resin. The detection includes ultraviolet spectrophotometry to detect the concentrations of various metal ions in the organic solvent, o-phenanthroline colorimetry to detect iron ion content, chloroposphonazo I colorimetry to detect calcium and magnesium ion content, and 18-crown-6 synergistic extraction process to detect potassium ion content.

Description

technical field [0001] The present invention mainly relates to the purification and detection method of metal ions in dimethyl sulfoxide, specifically potassium, sodium, calcium, magnesium and iron metal ions in polyacrylonitrile carbon fiber polymerization solvent-dimethyl sulfoxide (DMSO) Purification and detection methods. It is proposed to use the principle of static adsorption exchange to remove metal impurities in dimethyl sulfoxide; to remove iron ions in the organic phase with macroporous weak base type acrylic anion exchange resin, and to remove organic phase with macroporous strongly acidic styrene type cation exchange resin. Calcium, magnesium, sodium, potassium ions in solution. At the same time, the concentration of each metal ion in the organic solvent was quickly detected by ultraviolet spectrophotometry, and the colorimetric method of o-phenanthroline was proposed for the determination of Fe 3+ The content of the chlorophosphine azo I colorimetric method for ...

AI Technical Summary

Problems solved by technology

At present, even the T-300 grade carbon fiber, which is destined to be eliminated, still cannot be stably produced

The main reason is that the domestic carbon fiber has the following problems: low performance, large fluctuations, fiber surface treatment problems are not well resolved, single variety, uneven linear density, wool, hair balls, insufficient continuous length, inconsistent, and possible weaving performance. Poor, low collusion strength, expensive

[0005] At the same time, the cost of purifying raw materials remains high, which directly restricts the price of carbon fiber

The purification of the solvent dimethyl sulfoxide used in the polymerization of acrylonitrile mainly adopts the method of multiple rectification at present; because dimethyl sulfoxide has a high boiling point and is easy to absorb water, it needs multiple rectifications to make the carbon fiber greatly increased the cost of

However, there has never been an in-depth and detailed study on how to reduce costs and efficiently purify polymerization solvents for many years

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