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Process for recycling silver nitrate catalyst waste liquor

A waste liquid recovery, silver catalyst technology, applied in the direction of chemical recovery, silver compounds, silver compounds, etc., to achieve the effect of improving economic benefits, high purity, and guaranteed quality

Inactive Publication Date: 2019-06-04
张珍华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to process and comprehensively utilize the silver catalyst and its carrier waste residue, prepare silver nitrate and calcium nitrate hexahydrate, and provide a recycling process for silver nitrate catalyst waste liquid, which effectively utilizes waste Silver catalysts to produce valuable products such as silver nitrate and calcium nitrate, both creating economic value and eliminating pollution

Method used

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Embodiment

[0016] A kind of silver nitrate catalyst waste liquid recycling technique described in the present embodiment, comprises the steps:

[0017] 1) 500 kilograms of silver nitrate and calcium nitrate hexahydrate are prepared from silver nitrate and calcium nitrate hexahydrate using 500 kilograms of waste silver catalyst and its carrier waste residue (in terms of silver oxide) with catalyst silver content of 15% and calcium trioxide content of 85%. React with nitric acid solution in a corrosion-resistant reactor with a pure mass ratio of 1:0.78, start the agitator, carry out a chemical reaction, and react to form a mixed solution of silver nitrate and calcium nitrate, filter to obtain a clear filtrate of silver nitrate and calcium nitrate and a small amount impurity filter cake, send the impurity filter cake to incineration or landfill;

[0018] 2) the clarified filtrate of the above-mentioned silver nitrate and calcium nitrate obtained is sent into a vacuum distiller and carried o...

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Abstract

A process for recycling silver nitrate catalyst waste liquor comprises the following steps: letting a waste silver catalyst and its carrier waste residue react with a nitric acid solution at the puremass ratio of 1: 0.47-1.03 in a corrosion-resistant reactor to form a mixed solution of silver nitrate and calcium nitrate, and filtering to obtain a clear filtrate of silver nitrate and calcium nitrate; carrying out reduced pressure distillation by sending the clear filtrate of silver nitrate and calcium nitrate into a reduced pressure distiller, concentrating to a saturated solution and discharging and cooling, crystallizing for separation, firstly precipitating out silver nitrate and then precipitating out calcium nitrate nonahydrate crystal, washing, and drying to obtain calcium nitrate nonahydrate crystal and a silver nitrate product; sending the calcium nitrate nonahydrate crystal into a drying oven and heating to 68-72 DEG C and drying, cooling and packaging to obtain a calcium nitrate hexahydrate product. According to the invention, the waste silver catalyst and its carrier waste residue are used as raw materials to prepare silver nitrate and calcium nitrate hexahydrate, thus changing wastes into valuable things and creating considerable economic benefits for enterprises.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of waste catalysts in the deep processing of petroleum organic chemical industry, in particular to a process for recycling silver nitrate catalyst waste liquid. Background technique [0002] The ethylene oxidation method is that ethylene and air or oxygen are directly oxidized in the gas phase in the presence of a silver catalyst to generate ethylene oxide, which is absorbed by water in the absorption tower to form a condensed liquid, and the unoxidized ethylene is recycled back to the reactor to continue the reaction. Circular absorption until all ethylene oxide liquid is formed, and the absorption liquid is desorbed and rectified to obtain the finished product of ethylene oxide. [0003] The most important link in this oxidation reaction is to use catalyst silver to catalyze the reaction, and silver does not react with any substance inside, so the role of catalyst...

Claims

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Application Information

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IPC IPC(8): C01F11/38C01G5/00
CPCY02P20/584
Inventor 张珍华
Owner 张珍华