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Process for reclaiming Pd from waste Pd-C catalyst

A technology of spent catalysts and catalysts, which is applied in the fields of process efficiency improvement, photographic process, instruments, etc., can solve the problems of low palladium yield, complicated process, environmental protection issues, etc., and achieve the effect of efficient recovery

Inactive Publication Date: 2007-07-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above several methods can reclaim most of the palladium in the spent Pd-C catalyst, but the existing problems are also obvious, such as some complex processes, some low palladium yields, and some have environmental protection problems, etc.

Method used

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  • Process for reclaiming Pd from waste Pd-C catalyst

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0029] Except in Example 1, the raw material incineration process does not add additive calcium carbonate, all the other are operated under the conditions of Example 1, and the experimental results are shown in Table 1.

example 3

[0031] Except that in Example 1, when the palladium salt was dissolved, deionized water was used instead of hydrochloric acid with an acidity of 2 mol / L, and the rest were operated under the conditions of Example 1. The experimental results are shown in Table 1.

[0032] Table 1

[0033]

Example

palladium in palladium salt solution

Content (mg)

Palladium electrolysis

Quantity (mg)

Palladium Liquid Phase Recovery

Rate(%)

Palladium Total Recovery

Rate(%)

example 1

372

366

99.2

97.6

Example 2

350

345

93.3

92.0

Example 3

366

363

97.6

96.8

[0034] Note: 50g raw material contains palladium 375mg

[0035] Find out from table 1 data, the adding of additive makes the content of palladium in the palladium salt solution obviously improve; Replace the hydrochloric acid that acidity is 2mol / L with deionized water,...

example 4 to example 7

[0037] Using the method of Example 1, the palladium salt solution prepared was tested under different electrolysis conditions, and the test results are shown in Table 2.

[0038] Table 2

[0039] Example

Cathode potential V

Electrolysis time h

Palladium yield %

Palladium purity %

Example 4

-1.13

5

98.5％

99.9

Example 5

-1.13

4

98.3％

99.9

Example 6

-1.19

4

98.6％

99.9

Example 7

-1.25

4

98.61％

96.2

[0040] Note: Palladium yield refers to the precipitation rate of palladium before and after electrolysis

[0041] As can be seen from the data in Table 2, the prolongation of the electrolysis time and the improvement of the cathode reduction potential can improve the reduction and precipitation rate of palladium, but when the potential was raised to more than -1.20V, the improvement of the rho...

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Abstract

The invention provides a recovery method for palladium from lapsed Pd-C catalyst. With alkali or alkaline earth carbonate as an additive, in 700 to 800 Deg. C, oxygenizing and burning the lapsed Pd-C, refined residue reacting with alkali bisulfate and generating soluble palladium salt, then separating palladium by electrolysis, the single-pass recovery ratio can achieve more than 94 percent, and the purity is 99.95 percent.

Description

technical field [0001] The invention is a method for recovering palladium economically and efficiently from waste palladium catalysts, more precisely from spent waste Pd-C catalysts. Background technique [0002] Palladium catalysts are widely used in the field of chemical production. The commonly used Pd-C hydrogenation reaction catalyst can turn unsaturated alkenes and alkynes into saturated alkanes; turn unsaturated alcohols, aldehydes, ketones, and acids into saturated organic compounds ; Make the liquid oil become solid after hydrogenation. Palladium catalysts have the characteristics of high activity and good selectivity, but in actual production, the use of palladium catalysts also greatly increases the production cost of products. Therefore, whether palladium in spent catalysts can be recovered economically and efficiently depends on the It is extremely important in industry. [0003] Waste Pd-C catalyst is usually a solid slag-like substance with high carbon conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/06C25C1/20
CPCY02P10/20
Inventor 杨春吉赵锡武孟锐王斯晗李玉龙张宝军孙建林迟克彬冯英杰刘玉香
Owner PETROCHINA CO LTD
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