Novel catalyst for phthalic acid processing

Abstract

The invention relates to a novel catalyst for phthalic acid processing. A process includes steps: subjecting a carrier to water washing and acid washing; performing rhodium adsorption, mixing rhodiumcompound solution with calcium hypochlorite to obtain mixed liquid, and adopting the mixed liquid for impregnation or spraying of activated carbon, wherein a mole ratio of metal rhodium to calcium hypochlorite is 1:10-110; performing alkali neutralization until liquid pH value reaches 4.0-8.0; performing reduction to reduce rhodium adsorbed in the rhodium compound on the activated carbon into metal rhodium, wherein consumption of a reducing agent is 1-10 times of reducing equivalent; washing to remove chloride ions to obtain a catalyst product. The steps are carried out in a same reactor at the room temperature. The novel catalyst has advantages that the preparation process is simple, remarkable energy saving and water saving effects are achieved, competitive adsorption of impregnated substances is realized, the metal rhodium component can be uniformly distributed on the activated carbon, and the obtained catalyst is small in grain size, high in activity and long in service life.

Description

technical field [0001] The present invention relates to a novel catalyst for the processing of phthalic acid. Background technique [0002] The rhodium-carbon catalyst commonly used in the crude terephthalic acid hydrorefining process, whether it is prepared by impregnation or spraying, the conventional process steps are: 1. The activated carbon is washed with water to remove the dust and loose parts on the surface of the carbon; 2. Pickling the activated carbon, adjusting the structure of the functional group on the surface of the activated carbon by pickling; 3. Washing the activated carbon with water to neutrality; 4. Drying treatment; 5. Adsorbing rhodium, using the dipping method or spraying method to make the rhodium distributed on the surface of the carrier activated carbon Surface to a certain depth; 6. Water washing and neutralization; 7. Reduction, adding a reducing agent, and performing a reduction reaction under a certain temperature condition, reducing the rhodi...

AI Technical Summary

Problems solved by technology

The existing problems are: the preparation process is complicated, there are many washing steps, and the water consumption is large. The pickling, dipping, reduction, drying and other processes are all carried out under certain temperature conditions, and corresponding equipment suitable for the process is required, and the investment in equipment is large.