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Method for recovering catalyst rhodium from industrial waste liquid of carbonyl synthesis of acetic anhydride

A technology for oxo synthesis and industrial waste liquid, applied in chemical instruments and methods, physical/chemical process catalysts, chemical recovery and other directions, can solve the problems of high cost, low recovery rate of precipitation method, complicated extraction method and other problems, and achieve low cost , The effect of facilitating fair trade and high recovery rate

Active Publication Date: 2011-11-23
张超
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AI Technical Summary

Problems solved by technology

Among them, the recovery rate of the precipitation method is low, and the process of the extraction method is complicated and the cost is high.

Method used

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Embodiment 1

[0024] According to the following steps, catalyst rhodium is recovered from oxo synthesis acetic anhydride waste liquid

[0025] ①.Waste liquid incineration and ashing

[0026] Accurately measure 1000 kilograms of waste liquid from the acetic anhydride tower kettle of the oxo synthesis acetic anhydride synthesis unit containing rhodium 20 ppm, put it in an incineration tray, and send it to the incinerator for incineration. The weight of the obtained material after incineration is 400 kilograms. Then transfer the obtained material after incineration to an incineration furnace, control the temperature at 750° C., and incinerate at a constant temperature for 6 hours, then drop to room temperature to obtain 4 kg of incinerated material, which is ready for transformation;

[0027] ②. Molten oxidation transformation, water washing

[0028] The mixture of sodium peroxide and sodium hydroxide is used as the oxidant, and its weight ratio is Na 2 o 2 : NaOH=1:3, Na 2 o 2 Add 5 kg o...

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Abstract

The invention is a method for recovering catalyst rhodium from industrial waste liquid of carbonyl synthesis of acetic anhydride. The invention is characterized in that the method comprises the following steps: (1) waste liquid incineration and cineration, (2) melt oxidation transformation, water washing, (3) preparation of aqueous rhodium salt solution, (4) zinc powder displacement, (5) pickling for zinc powder removal. The content of the recovered rhodium is not less than 78%, and the recovery rate is not less than 98%. The invention provides a method for recovering catalyst rhodium from industrial waste liquid of carbonyl synthesis of acetic anhydride, which has high recovery rate, simple process, and low cost. The content of the recovered rhodium is not less than 78%, which not only meets the process requirements for the carbonyl synthesis of acetic anhydride, but also greatly reduces recovery cost; the recovery rate of rhodium is not less than 98%, and the method provides genuine goods at a fair price, and is convenient for a fair shake.

Description

technical field [0001] The invention relates to a method for recovering catalyst rhodium from oxo synthesis acetic anhydride industrial waste liquid. belongs to catalyst regeneration. Background technique [0002] As a catalyst for oxo reaction, metal rhodium has the characteristics of good selectivity and high activity, especially when used together with complexing agent or cocatalyst, the synthesis reaction can be carried out smoothly under lower pressure, the production is stable, and the product is convenient to take out, etc. Many advantages. Therefore, the classical rhodium catalyst was obtained, albeit quite expensive. [0003] However, the recovery and utilization of rhodium catalysts is difficult, and the current methods for recovering catalysts generally include precipitation, extraction, and incineration. Among them, the recovery rate of the precipitation method is low, and the process of the extraction method is complicated and the cost is high. Contents of ...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/96C07C53/12C07C51/56
CPCY02P20/584
Inventor 张超张立省郇恒春
Owner 张超
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