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A method for deoiling oily spent catalyst

A waste catalyst and deoiling technology, which is applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve the problems of low leaching rate of valuable metal elements, difficulty in effective control of sintering temperature, and refractory compounding Oxide and other problems, to avoid the formation of composite oxides, avoid greenhouse gas emissions, and low energy consumption

Active Publication Date: 2018-02-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the high-temperature calcination process, a large amount of organic oil is easy to burn, making it difficult to effectively control the sintering temperature, and it is easy to generate complex oxides (NiMoO 4 、CoMoO 4 、NiWO 4 etc.), resulting in low leaching rate of valuable metal elements and waste of resources
In addition, oxidative roasting will produce a large amount of greenhouse gases. With global warming, the requirements for carbon emission standards will gradually increase, and the cost of dealing with oxidative roasting greenhouse gases will continue to rise

Method used

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  • A method for deoiling oily spent catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this example, waste Mo-Co / Al 2 o 3 The catalyst is the treatment object, and its oil content (mass percentage content, the same below) is about 20%.

[0021] Through the crushing process, the particle size of the spent catalyst was crushed to 500 μm. The mass ratio of water to spent catalyst is 14:1, and NaOH and sodium dodecylsulfonate are added to the water to reduce the oil-water interfacial tension and promote oil-solid separation. The solid content of NaOH in the mixed solution after adding NaOH and sodium dodecylsulfonate is 2wt%, and the solid content of sodium dodecylsulfonate is 0.1wt% to obtain feed liquid; The feed liquid that configures is placed in 90 In a constant temperature environment of ℃, after stirring for three hours, when the color of the liquid phase does not change, stop stirring and heating; filter while hot to achieve solid-liquid separation. The obtained filter residue is washed twice with hot water at 90° C., and the solid obtained afte...

Embodiment 2

[0023] In this embodiment, waste Mo-Ni / Al 2 o 3 The catalyst is the object of treatment, and its oil content is about 18%.

[0024] Through the crushing process, the particle size of the spent catalyst was crushed to 100 μm. The mass ratio of water to spent catalyst is 8:1, and sodium dodecylsulfonate is used as deoiling surfactant. The solid content of NaOH in the mixed solution after adding NaOH and sodium dodecylsulfonate is 2wt%, and the solid content of sodium dodecylsulfonate is 0.1wt% to obtain feed liquid; In a constant temperature environment of 100°C, stir for four hours. When the color of the liquid phase does not change, stop stirring and heating; filter while hot to achieve solid-liquid separation. The obtained filter residue is washed twice with hot water at 90° C., and the solid obtained after washing can be dried in a drying oven. The removal rate of hydrophobic oil in the waste catalyst can reach more than 98%.

Embodiment 3

[0026] In this example, waste Mo-Co / Al 2 o 3 The catalyst is the object of treatment, and its oil content is about 20%. Sodium dodecylbenzenesulfonate was used as deoiling surfactant.

[0027] Through the crushing process, the particle size of the spent catalyst was crushed to 300 μm. The mass ratio of water to spent catalyst is 10:1, and NaOH and sodium dodecylbenzenesulfonate are added to the water to reduce the oil-water interfacial tension and promote oil-solid separation. The solid content of NaOH in the mixed solution after adding NaOH and sodium dodecylsulfonate is 2wt%, and the solid content of sodium dodecylsulfonate is 0.1wt% to obtain feed liquid; In a constant temperature environment of 90°C, after stirring for three hours, when the color of the liquid phase does not change, stop stirring and heating; filter while hot to achieve solid-liquid separation. The obtained filter residue is washed twice with hot water at 90° C., and the solid obtained after washing ca...

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Abstract

The invention discloses a method for deoiling an oil-bearing waste catalyst. The key points of the technical scheme are that the waste catalyst is crushed until the particle diameter is less than 1,000 [mu]m, and the deoiling conditions are that the mass ratio of water to the waste catalyst is (12-6):1, the mass concentrations of NaOH and a surfactant are respectively controlled to be 0.05-3 wt% and 0.01-0.3 wt%, and the deoiling temperature is 40-100 DEG C. When the color of the deoiling cleaning solution does not change obviously, a conventional solid-liquid separation means is adopted to separate the oil-bearing liquid and solid. According to the technical scheme, the deoiling treatment of the oil-bearing waste catalyst is successfully realized, and the method is applicable to deoiling of one or a mixture of more of a hydrodesulfurization catalyst, a hydrodenitrification catalyst and other oil-bearing waste catalysts. The method is low in energy consumption, high in deoiling efficiency, strong in adaptability, low-carbon and environment-friendly, and can effectively avoid generation of difficultly decomposed composite oxide, so as to create favorable conditions for valuable metal extraction and cyclic utilization of the waste catalyst.

Description

technical field [0001] The invention discloses a method for deoiling oil-containing waste catalysts, which belongs to the fields of chemical separation and recycling of waste resources, and in particular relates to separation methods for deoiling waste industrial catalysts such as hydrodesulfurization and hydrodenitrogenation. Background technique [0002] With the rapid development of economy and society, the continuous growth of population, and the increase of car ownership year by year, the human demand for petrochemical products including gasoline and diesel is increasing day by day. At the same time, due to the emergence of smog and other weather, people are extremely concerned about air quality, which has prompted the continuous improvement of oil product quality standards, and the use of petroleum refining catalysts has increased. However, taking the hydrodesulfurization catalyst as an example, a large amount of hydrophobic oil will adsorb on its surface during its us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J38/48B01J38/64B01J38/52B01J23/94
CPCB01J23/94B01J38/48B01J38/485B01J38/52B01J38/64B01J2523/00B01J2523/31B01J2523/68B01J2523/845B01J2523/847
Inventor 徐盛明杨越徐政和谢博毅曹田田李震
Owner TSINGHUA UNIV
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