Method for preparing methanesulfonic acid by utilizing bipolar membrane electrodialysis technology

Abstract

The invention discloses a method for preparing methanesulfonic acid by utilizing a bipolar membrane electrodialysis technology. The method comprises the following steps: treating a sodium methanesulfonate aqueous solution used as a raw material by virtue of a microporus filter; introducing the solution into a feed liquid chamber to perform bipolar membrane electrodialysis treatment; stopping operation when the conductivity of the feed liquid is reduced to be 2000mu s / cm or below, obtaining a methanesulfonic acid solution in an acid chamber, and recycling the alkaline solution in an alkaline chamber. In the bipolar membrane electrodialysis process, the membrane stack treatment is performed by adopting the two-compartment structure, three-compartment structure and four-compartment structure of bipolar membrane electrodialysis, and the yield of the methanesulfonic acid is effectively improved. According to the designed bipolar membrane four-compartment structure, introduction of sodium ions can be effectively blocked in the preparation process, and high-purity methanesulfonic acid is obtained. According to the method disclosed by the invention, the raw material cost is low, the alkali liquor is recycled, and the preparation cost is saved. Moreover, secondary environmental pollution in the traditional organic synthesis method is avoided, and the safety level is improved.

Description

technical field [0001] The invention relates to a method for preparing methanesulfonic acid, in particular to a method for preparing methanesulfonic acid by using bipolar membrane electrodialysis. Background technique [0002] As the main salt, methanesulfonate has a unique use in brush copper plating and cadmium plating. For example, copper methanesulfonate has two types in brush plating copper plating solution, namely acidic high-speed copper and high accumulation Alkali copper, with its excellent performance and wide application, is unmatched by other copper salts. With the development of society and the advancement of technology, the application of lead-free alloy solder in the electronics industry has further promoted the demand for new electrolytes, and the technical performance of many new electrolytes depends largely on the methanesulfonic acid used , At the same time the purity of methanesulfonic acid has also put forward higher requirements. [0003] The synthesi...

AI Technical Summary

Problems solved by technology

However, the product of this method contains a large amount of sulfuric acid, and the boiling points of methanesulfonic acid and sulfuric acid are very close, so it is difficult to separate, and dimethyl sulfate is highly toxic as a methylating reagent.

These traditional chemical methods have common disadvantages: product separation is relatively difficult, and more sulfuric acid is produced; on the other hand, it has great environmental pollution

Due to the generation of chlorine gas, this method will dissolve in the solution and undergo a series of complicated reactions, so that the aqueous solution of methanesulfonic acid contains a large amount of impurities, and the raw materials and products are mixed together, which is difficult to separate and expensive.

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