Method for preparing high purity rhodium trichloride by removing impurity from liquid phase digestion solution of waste rhodium catalyst

Abstract

The invention discloses a method for preparing high purity rhodium trichloride by removing impurities from a liquid phase digestion solution of a waste rhodium catalyst. The method is characterized by comprising the following steps: step one, taking liquid phase digestion solution obtained by digesting waste rhodium catalyst for carbonyl synthesis with concentrated sulfuric acid and nitrate, adjusting to pH value to 1-5 by using sodium hydroxide, dropwise adding a sodium oxalate solution with stirring so that the solution becomes turbid, continuing adding the sodium oxalate solution until complete precipitation, stirring for 20-40 min and filtering to obtain the filtrate, wherein the concentration of sodium oxalate solution is 1-10 wt%; and two, directly heating the filtrate obtained in the step one or diluting the filtrate with deionized water by 10 times and heating to a boiling state, adjusting the pH value to 8 with 1%-15% sodium hydroxide solution, stirring and filtering to obtain a rhodium gel; and dissolving the rhodium gel in 6 mol / L hydrochloric acid, and evaporating, concentrating and drying the solution to obtain high-purity three rhodium trichloride. The method of the invention is applicable to recovery of noble metal rhodium from the waste rhodium catalyst from carbonyl synthesis, and is economical and environment-friendly; and the method has the advantages of mild reaction conditions, simple operation and easiness for industrialization.

Description

technical field [0001] The invention relates to a method for preparing high-purity rhodium trichloride by removing impurity ions from the digestion solution of spent rhodium catalyst, more specifically, recovering precious metal rhodium from the liquid-phase digestion solution of waste rhodium catalyst for oxo synthesis to prepare high-purity rhodium trichloride Methods. Background technique [0002] As one of the most commonly used catalysts for oxo synthesis in the chemical industry, rhodium-phosphine complex catalysts have a series of advantages, such as high catalytic activity, mild catalytic reaction conditions, low equipment requirements, and the addition of an appropriate amount of phosphine ligands can Increase the normal isomerization ratio of the product and increase the output value. However, in the long-term industrial production process, external impurities will reduce the activity of the rhodium catalyst, and the formation of the rhodium cluster complex will d...

AI Technical Summary

Problems solved by technology

The impurity removal method of ion exchange resin requires the concentration of the sample to be treated to be extremely dilute, so that a large amount of water will be used, which will make the subsequent concentration consume more energy.