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Process for recovering cobalt from cobalt based fischer-tropsch synthetic catalyst

A recovery method and a technology for synthesizing support, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of complex process, low recovery rate, unfriendly environment, etc., and achieve high recovery rate, easy recovery, and catalyst requirements. low effect

Inactive Publication Date: 2008-09-24
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complicated and the recovery rate is low, and the recovery method is not friendly to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Put 50kg Co / SiO 2 The Fischer-Tropsch synthesis catalyst (metal cobalt content 20%) is put into the high-pressure reactor, and 50 Kg of deionized water is added, and the stirring speed is 50 revolutions per minute. Pass the CO gas into the reaction kettle with a partial pressure of 0.5 MPa, heat it to 70° C., and hold it at a constant temperature for 2 hours.

[0020] 2) After the CO gas in the reactor is dehydrated, it is collected again for use. The deionized water in which cobalt ions are dissolved is discharged from the bottom of the reactor, and 17L of sodium hydroxide solution with a concentration of 10mol / L is added to obtain Co(OH) 2 Precipitate and filter. Co(OH) obtained by filtration 2 Add nitric acid to the precipitate to make the precipitate just dissolve, evaporate the solution to obtain Co(NO3) 2 ·6H 2 The O crystal is 47.3Kg, the purity is 97%, and the recovery rate is 96%.

Embodiment 2

[0022] 1) 50kg Co / Al 2 O 3 The Fischer-Tropsch synthesis catalyst (metal cobalt content 15%) is put into the high-pressure reactor, 100 Kg of deionized water is added, and the stirring speed is 700 revolutions per minute. Pass the CO gas into the reaction kettle with a partial pressure of 5 MPa, heat it to 120° C., and hold it at a constant temperature for 12 hours.

[0023] 2) After the CO gas in the reactor is dehydrated, it is collected again for use. The deionized water in which cobalt ions are dissolved is discharged from the bottom of the reactor, and 12.7L of potassium hydroxide solution with a concentration of 10mol / L is added to obtain Co(OH) 2 Precipitate and filter. Add nitric acid to the filtered species to just dissolve the precipitate, evaporate the solution to obtain Co(NO3) 2 ·6H 2 O crystal 35Kg, purity of 96%, recovery rate of 94.6%

Embodiment 3

[0025] 1) 50kg Co / ZrO 2 The Fischer-Tropsch synthesis catalyst (metal cobalt content 30%) is put into the high-pressure reactor, 200Kg of deionized water is added, and the stirring speed is 300 rpm. The CO gas is introduced into the reaction kettle with a partial pressure of 1.5 MPa, heated to 110° C., and kept at a constant temperature for 6 hours.

[0026] 2) After the CO gas in the reactor is dehydrated, it is collected again for use. The deionized water in which cobalt ions are dissolved is discharged from the bottom of the reactor, and 25.4L of potassium hydroxide solution with a concentration of 10mol / L is added to obtain Co(OH) 2 Precipitate and filter. Add nitric acid to the filtered species to just dissolve the precipitate, evaporate the solution to obtain Co(NO3) 2 ·6H 2 O crystal 72.5Kg, purity of 95.7%, recovery rate of 96%

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Abstract

A method of recycling Cobalt from Cobalt-based catalyst for F-T synthesis is carried out as follows, deionized water and waste Cobalt-based catalyst for F-T synthesis are added into a reaction vessel according to the weight ratio of 1 to 5:1, carbon monoxide is introduced into the reaction vessel till the differential pressure is at 0.5 to 5 Megapascal, then the reaction vessel is kept at the stirring speed of 50 to 700 revolution per minute and the heating temperature of 50 to 200 DEG C for constant temperature about 0.5 to 12 hours; Carbon monoxide is discharged from the reaction vessel after reducing temperature, water is discharged from the reaction vessel, alkali liquor is added into the water, then Cobalt is precipitated as Co(OH)2; Nitric acid is added into the precipitation for dissolving the precipitation, then Cobaltous nitrate is obtained after evaporation and crystallization. The method of recycling Cobalt from Cobalt-based catalyst for F-T synthesis has the advantages of the simple method, the environmental friendliness, and the high recovery efficiency and purity.

Description

Technical field [0001] The invention provides a method for recovering a catalyst, in particular a method for recovering cobalt in a cobalt-based Fischer-Tropsch synthesis catalyst. technical background [0002] Due to the increasing shortage and deterioration of petroleum resources, with the increasing demand for refined oil, and the increasingly stringent environmental regulations, the search for alternative energy is a major and urgent issue in China and the world. Fischer-Tropsch synthesis uses H 2 Obtaining high-quality liquid fuels and chemicals with CO and CO under the action of a catalyst is a new way to produce liquid fuels, and it is also the most effective and promising technology and most effective way in the energy field at present. [0003] Currently, Fischer-Tropsch synthesis catalysts mainly use two types of catalysts: iron-based and cobalt-based. In particular, the cobalt-based Fischer-Tropsch catalyst is a hot spot of current research and application. However, my...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B61/00C01G51/00
CPCY02P10/20
Inventor 孙予罕贾丽涛李德宝侯博
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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