Method for preparing PdCl2

Abstract

The invention relates to a method for preparing PdCl2. A diaphragm electrolytic cell is adopted for electrolysis, an anionic membrane is used for dividing the electrolytic cell into a dual-chamber electrolytic cell, a palladium strip is adopted as an anode, an inert electrode is adopted as a cathode, a hydrochloric acid solution of 1 mol/L to 6 mol/L is adopted as anode liquor, a sodium chloride solution of 0.1 mol/L is adopted as cathode liquor, electrolysis is carried out for 30 min to 60 min, the anode liquor obtained after electrolysis is concentrated and crystallized, and PdCl2 is obtained. The method has the beneficial effects that an ion exchange membrane electrolysis method is adopted as the core technology, an electrochemical method is adopted, the palladium strip is adopted as the anode, the inert electrode is adopted as the cathode, the hydrochloric acid solution and the sodium chloride solution are adopted as electrolysis liquor, no aqua regia is utilized, the process of removing nitre is omitted, the technological process is greatly simplified, equipment chemical corrosion is reduced, and environment pollution is reduced; and an ion exchange membrane is adopted, the situation that palladium dissolved out of the anode enters a cathode area and is separated out of the cathode again can be avoided, production efficiency is improved, energy saving and emission reduction of production are achieved, and great economic benefits and social benefits can be generated.

Description

technical field [0001] The invention belongs to the field of membrane electrolysis and relates to a PdCl 2 method of preparation. Background technique [0002] Palladium Chloride (PdCl 2 ) is a brown-red crystal, soluble in water, hydrochloric acid, ethanol, acetone and hydrobromic acid. In the field of petrochemical industry, it is not only directly used as a catalyst for the oxidation of ethylene to acetaldehyde, but also used to prepare catalysts or molecular sieves with different supports. In addition, it also has important uses in the preparation of surfactants for non-conductive material coatings and the production of gas-sensitive components. [0003] The common preparation method of palladium chloride is: utilize the palladium sponge recovered from the waste palladium carbon catalyst replaced by the purified terephthalic acid production unit, and adopt the aqua regia dissolution method to produce high-purity palladium chloride. The process equipment is complex an...

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Problems solved by technology

But even if this method adopts the best concentration of hydrochloric acid (4~6mol / L), the maximum current efficiency is only 75.6%. Simultaneously, due to the high acidity, the acid mist is relatively large, and in order to maintain a higher current efficiency, the final acid concentration of the solution Higher, resulting in lower acid utilization

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