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Method for preparing regenerable normal-temperature nano-desulfurizer

A desulfurization agent, nanotechnology, applied in the field of desulfurization agent preparation, can solve the problems of poor desulfurization stability and low sulfur capacity, and achieve the effect of prolonging the service life

Inactive Publication Date: 2010-06-02
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problems of low sulfur capacity of existing zinc oxide-based desulfurizers under normal temperature conditions and poor desulfurization stability of regenerated materials, and to provide a preparation of a renewable normal temperature nano desulfurizer method

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific embodiment 1: The preparation method of the renewable normal temperature nano-desulfurizer in this embodiment is as follows: 1. Add cobalt nitrate to the zinc nitrate solution with a concentration of 0.35mol / L-0.5mol / L to obtain Co ions and Zn ions Molar ratio is the mixed solution of 3~5: 100; Two, according to the ratio that the total molar ratio of Co ion and Zn ion in urea and mixed solution is 3.4~3.6: 1, urea is added in the mixed solution of step one gained, then Under the condition of 90℃~110℃, react for 1h~1.5h, stand still for 1h, and filter to obtain the precursor; 3. Wash the precursor with deionized water for 2 to 4 times, and then under the condition of 100℃~130℃ Drying for 1.5h to 2.5h, and then roasting at 250°C to 300°C for 1h to 1.5h to obtain a renewable room temperature nano desulfurizer.

[0008] In step 2 of this embodiment, urea is added to the mixed solution obtained in step 1, and then placed in a stainless steel pressure cooker, and th...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that the concentration of the zinc nitrate solution in step 1 is 0.4 mol / L. Others are the same as in the first embodiment.

[0012] The renewable normal-temperature nano desulfurizer obtained in this embodiment can be regenerated five times under the conditions of an oxygen partial pressure of 5% and a temperature of 370°C. The service life of nano desulfurizer is 830-930min.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the molar ratio of Co ions to Zn ions in the mixed solution in Step 1 is 4:100. Others are the same as in the first or second embodiment.

[0014] The renewable normal-temperature nano desulfurizer obtained in this embodiment can be regenerated five times under the conditions of an oxygen partial pressure of 5% and a temperature of 370°C. The service life of nano desulfurizer is 830-930min.

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Abstract

The invention relates to a method for preparing a regenerable normal-temperature nano-desulfurizer. The invention can solve the problems of low sulfur capacity of zinc oxide-based desulfurizer at normal temperature and poor desulfurization stability of material after regeneration. The method for preparing the regenerable normal-temperature nano-desulfurizer comprises the following steps: adding cobalt nitrate into zinc nitrate solution, then adding urea solution, placing the mixed solution under the condition of 90 DEG C-110 DEG C for carrying out reaction for 1h-1.5h, standing for 1h, filtering, obtaining a precursor, washing the precursor, then drying, further calcining and obtaining the regenerable normal-temperature nano-desulfurizer. The particle size of the regenerable normal-temperature nano-desulfurizer is 12-15nm, the desulfurization activity under the normal-temperature condition is higher, five times of regeneration can be carried out under the conditions that the partial pressure of oxygen is 5% and the temperature is 370 DEG C, the stable desulfurization performance can be obtained after the regeneration, the accumulative sulfur capacity after sulfurization / recycling desulfurization can be up to 19.1%, and the service life can achieve 930min.

Description

technical field [0001] The invention relates to a preparation method of a desulfurizing agent. Background technique [0002] Although zinc oxide-based desulfurizers have high desulfurization precision and good desulfurization activity at medium and high temperatures, their reaction speed slows down at room temperature, their sulfur capacity decreases, and regeneration requires high temperatures above 600°C. Therefore, they are often discarded without regeneration after use. This leads to high operating costs of the desulfurization system. In recent years, the desulfurization activity of nano-zinc oxide-based desulfurizers at room temperature has been improved, and the regeneration of desulfurizers can be realized at lower temperatures, but the desulfurization stability of the regenerated materials is poor, and it is difficult to meet the requirements of industrial applications. . With the development of production and life, a large number of sulfur-containing compounds are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/48
Inventor 李芬杨莹张艳魏金枝姜俊艳杜青林
Owner HARBIN UNIV OF SCI & TECH