Method for preparing methanesulfonic acid by utilizing bipolar membrane electrodialysis technology

A bipolar membrane electrodialysis and methanesulfonic acid technology, applied in membrane technology, sulfonic acid preparation, chemical instruments and methods, etc., can solve the problems of dimethyl sulfate being highly toxic, difficult product separation, and difficult separation. Achieve the effect of avoiding secondary pollution of the environment, avoiding pollutants, and improving yield

Active Publication Date: 2015-04-29
绍兴众昌化工股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Method for preparing methanesulfonic acid by utilizing bipolar membrane electrodialysis technology
  • Method for preparing methanesulfonic acid by utilizing bipolar membrane electrodialysis technology
  • Method for preparing methanesulfonic acid by utilizing bipolar membrane electrodialysis technology

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Embodiment 1

[0034] The preparation of sodium methanesulfonate is carried out by a bipolar membrane electrodialysis system, and the bipolar membrane electrodialysis system is composed of two bipolar membrane electrodialysis devices connected in series.

[0035] A bipolar membrane electrodialysis device with a four-compartment structure is adopted. The area of ​​each membrane is 110mm×270mm, and the membrane stack is composed of 5 pairs of membrane groups. The bipolar membrane electrodialysis device is composed of anolyte chambers on both sides and an electrodialysis compartment sandwiched between the anolyte chambers on both sides. The anolyte chamber is divided into a cathode chamber and an anode chamber, and the left side is a cathode chamber , the right side is the anode chamber, and the electrodialysis compartment is composed of bipolar membranes, anion exchange membranes, cation exchange membranes, and anion exchange membranes. , and consists of five membrane groups arranged in series...

Embodiment 2

[0039] The preparation of sodium methanesulfonate is carried out by a bipolar membrane electrodialysis system, and the bipolar membrane electrodialysis system is composed of two bipolar membrane electrodialysis devices connected in series.

[0040] A bipolar membrane electrodialysis device with a four-compartment structure is adopted. The area of ​​each membrane is 200mm×800mm, and the membrane stack is composed of 40 pairs of membrane groups. The bipolar membrane electrodialysis device is composed of anolyte chambers on both sides and an electrodialysis compartment sandwiched between the anolyte chambers on both sides. The anolyte chamber is divided into a cathode chamber and an anode chamber, and the left side is a cathode chamber , the right side is the anode chamber, and the electrodialysis compartment is composed of bipolar membranes, anion exchange membranes, cation exchange membranes, and anion exchange membranes. , and consists of 40 membrane groups arranged in series ...

Embodiment 3

[0043] The preparation of sodium methanesulfonate is carried out by a bipolar membrane electrodialysis system, and the bipolar membrane electrodialysis system is composed of two bipolar membrane electrodialysis devices connected in series.

[0044] A bipolar membrane electrodialysis device with a three-compartment structure is adopted. The area of ​​each membrane is 110mm×270mm, and the membrane stack is composed of 5 pairs of membrane groups. The bipolar membrane electrodialysis device is composed of anolyte chambers on both sides and an electrodialysis compartment sandwiched between the anolyte chambers on both sides. The anolyte chamber is divided into a cathode chamber and an anode chamber, and the left side is a cathode chamber , the right side is the anode chamber, and the electrodialysis compartment is composed of bipolar membranes, anion exchange membranes, and cation exchange membranes, which are composed of acid chambers, feed liquid chambers, and alkali chamber membr...

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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...

Claims

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Application Information

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IPC IPC(8): C07C309/04C07C303/02B01D61/44
Inventor 严间浪林溪沈江南谢作王侯震东陈振华刘定华
Owner 绍兴众昌化工股份有限公司
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