Method and device for preparing tin methane sulfonate through hydrogen-free electrolysis

Abstract

The invention provides a method for preparing tin methane sulfonate through hydrogen-free electrolysis, and relates to the field of manufacturing the tin methane sulfonate through industrial electrolytic synthesis and can be used for directly preparing a tin methane sulfonate solution through using an electrolytic process. According to the method provided by the invention, electrolyte is a methanesulfonic acid solution; a cathode of an electrode is a gas diffusion electrode, and an anode of the electrode is solid tin; the cathode and the anode are separated through a membrane; the electrolyte temperature is controlled within a range of 0-60 DEG C; a current density is set within a range of 10-800 A / m<2>; the electrolyte is stopped until a content of free methyl sulfuric acid in the anode electrolyte is up to 0.1-10 g / L; and the anode electrolyte is filtered and concentrated, so as to prepare the tin methane sulfonate solution with different concentrations. The method provided by the invention is suitable for being carried out at the constant temperature and the constant pressure, so that the tin methane sulfonate solution with high purity can be directly obtained. The method provided by the invention has the characteristics of being simple in process, free from separation, high in product purity, low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to the field of industrial electrolytic synthesis of tin methanesulfonate, in particular to a method and a device for preparing stannous methanesulfonate by hydrogen-free electrolysis. Background technique [0002] Tin methanesulfonate is an important organotin compound, which is widely used in organic synthesis and tin plating process, and can be used as the main salt and additive of tin plating. With the rapid development of electroplating and electronics industry, the traditional electroplating tin-plating process with fluoroborate as the main salt can no longer meet the performance requirements of tin-plating electronic components. The electroplating solution for electroplating tin with tin methanesulfonate as the main salt has attracted widespread attention in recent years because of its advantages of stable solution, low toxicity, low corrosion, low foaming, no lead and fluorine toxicity, and high coating quality. [0003] ...

AI Technical Summary

Problems solved by technology

Compared with the chemical synthesis method, it has the advantages of simple process, easy control of the reaction, fast reaction speed, short production cycle, less impurity content than the product obtained by the stannous chloride method, no need for additional separation and purification, and simple post-treatment. By controlling the concentration of the electrolyte and solid purity, one step can directly obtain the required purity and concentration of stannous methanesulfonate aqueous solution, but the electrolytic cell voltage of the diaphragm method is high, a large amount of hydrogen gas is precipitated at the cathode, and sulfuric acid mist is brought out, which seriously pollutes the environment; hydrogen gas The explosion limit is low, and it is prone to the danger of hydrogen explosion. It has not been applied yet and needs to be improved.

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