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Waste catalyst recycling method

A waste catalyst, alumina technology, applied in chemical recovery, chemical instruments and methods, inorganic chemistry and other directions, can solve the problems of waste of alumina carrier, waste catalyst replacement device can not meet the reuse of waste catalyst, etc., to achieve clean and efficient extraction, Reduce the effect of excess anion

Inactive Publication Date: 2020-08-25
大连众智创新催化剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing recycling of spent catalysts mainly considers the recovery of metals or the reuse of replacement devices. The simple recycling of metals leads to a large amount of waste of alumina carriers, and the replacement devices of spent catalysts cannot meet the requirements of recycling all used catalysts.

Method used

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  • Waste catalyst recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take the molybdenum-nickel series catalyst after industrial operation for extraction and deoiling, dry, microwave treatment, and the treatment time is 5h; weigh 100g of the catalyst, crush it to 300 mesh; weigh 26.5g of sodium carbonate, mix it evenly with the spent catalyst, and roast at 600°C 4h; put the burnt solid into 400g hot water, use an autoclave to leaching at 120°C, and filter to obtain sodium molybdate solution and 74.2g solid 1; add sulfuric acid solution to the molybdate solution, and adjust the pH value to 5.2~ 7. After removing aluminum ions, continue to adjust the pH value to 1-2 to obtain 26.5g molybdic acid; mix solid 1 with 90g sodium carbonate solid, roast at 900°C, leaching in an autoclave at 120°C for 4 hours, and filter to obtain Sodium aluminate solution and 4.2g nickel oxide solid; the sodium aluminate solution was cooled to 50°C, crystallized for 24 hours, filtered to obtain sodium aluminate hydrate and dilute sodium aluminate solution; the sod...

Embodiment 2

[0030]Take the molybdenum-nickel series catalyst after industrial operation for extraction and deoiling, dry, and microwave treatment for 6 hours; weigh 100g of the catalyst, crush it to 300 mesh; weigh 26.5g of sodium carbonate, mix it with the spent catalyst, and roast at 700°C 4h; Put the burnt solid into an autoclave for leaching at 120°C, with a net water volume of 400g, filter to obtain sodium molybdate solution and 73.9g of solid 1; add sulfuric acid solution to the molybdate solution, and adjust the pH value to 5.2 ~7, after removing the aluminum ions, continue to adjust the pH value to 1~2 to obtain 26.3g of molybdic acid; mix solid 1 with 84g of sodium carbonate solid, roast at 930°C, leaching in an autoclave at 120°C for 4 hours, filter, Sodium aluminate solution and 4.1g nickel oxide solid were obtained; the sodium aluminate solution was cooled to 60°C, crystallized for 24 hours, filtered to obtain sodium aluminate hydrate and dilute sodium aluminate solution; the s...

Embodiment 3

[0032] Take the molybdenum-nickel series catalyst after industrial operation for extraction and deoiling, dry, microwave treatment, and the treatment time is 5h; weigh 100g of the catalyst, crush it to 300 mesh; weigh 26.5g of sodium carbonate, mix it evenly with the spent catalyst, and roast at 700°C 4h; Put the burnt solid into 400g of hot water, use an autoclave to leach at 120°C, and filter to obtain sodium molybdate solution and 74.1g of solid 1; add sulfuric acid solution to the molybdate solution, and adjust the pH value to 5.2~ 7. After removing aluminum ions, continue to adjust the pH value to 1-2 to obtain 25.9 molybdic acid; mix solid 1 with 84g sodium carbonate solid, roast at 930°C, leaching in an autoclave at 120°C for 4 hours, and filter to obtain aluminum sodium aluminate solution and 4.1g nickel oxide solid; the sodium aluminate solution was cooled to 60°C, crystallized for 24 hours, filtered to obtain sodium aluminate hydrate and dilute sodium aluminate soluti...

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Abstract

The invention discloses a waste catalyst recycling method, and particularly discloses a method for preparing a hydrogenation catalyst from a molybdenum-nickel waste catalyst. The method comprises thefollowing steps of: carrying out mixed roasting and leaching on pretreated molybdenum-nickel waste catalyst powder and alkali to obtain a molybdate solution and aluminum oxide filter residues, and adjusting the pH value of the molybdate solution to remove aluminum ions to obtain molybdic acid; mixing the aluminum oxide filter residues with alkali, and carrying out secondary roasting and leaching to obtain a sodium aluminate solution and a nickel oxide solid; cooling and crystallizing the sodium aluminate solution, performing filtering and separation to obtain a hydrated sodium aluminate solidand a diluted sodium aluminate solution; drying the hydrated sodium aluminate solid to obtain sodium aluminate; introducing carbon dioxide into the dilute sodium aluminate solution, and obtaining a first-stage product after a reaction is finished; carrying out second-stage parallel flow reaction on the first-stage product and acid liquor; and finally, performing aging, filtering and drying to obtain pseudo-boehmite. According to the method of the invention, the pore volume of the pseudo-boehmite is effectively increased, and the problem of repeated utilization of a waste catalyst carrier is solved.

Description

technical field [0001] The invention relates to a method for recycling waste catalysts, in particular to a method for preparing hydrogenation catalysts by using molybdenum-nickel series waste catalysts. Background technique [0002] With the development of industry, more and more catalysts are used, and the waste catalysts produced also increase. In the past, the disposal methods of spent catalysts mainly included landfill-solidification treatment, incineration and recycling-recycling-reuse. The first two methods are not the fundamental method to solve the outlet of spent catalysts, because they pollute the environment and waste resources. , so some countries expressly prohibit the use. Only the recovery-recycling-reuse method is the best way to solve the outlet of spent catalysts. It not only saves natural resources, but also reduces environmental pollution, and in most cases can also obtain considerable benefits. The catalyst consumption of hydrogenation units in the pet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00C01G53/04C01F7/04C01F7/14
CPCC01G39/00C01G53/04C01F7/04C01F7/0693C01F7/142C01P2006/12C01P2006/14Y02P20/584
Inventor 何海龙陈志坤于莫白张振振李孝华栾福冰
Owner 大连众智创新催化剂有限公司
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