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Fast stabilization preparation method of alumina sol

A technology of alumina sol and gel, applied in alumina/aluminum hydroxide and other directions, can solve the problems of long time for alumina sol and long time for stabilization of alumina sol, shorten the stabilization time, save time, and speed up dissolving. effect of the process

Active Publication Date: 2014-12-10
河南省格林沃特环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method of industrial production of alumina sol usually uses pseudo-boehmite as raw material, and prepares alumina sol by acid hydrolysis, but the existing method takes a long time to prepare alumina sol, especially the stability time of alumina sol is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a fast-stable alumina sol, comprising the following steps:

[0016] 1) Heat deionized water to 80°C;

[0017] 2) Add pseudo-boehmite powder to deionized water, with Al 2 o 3 meter, the concentration is 100g / L, stirring and pulping;

[0018] 3) Add 18% nitric acid to the slurry prepared in step 2) in an amount of 60g / L to gel;

[0019] 4) Add glycerol polyoxyethylene ether during the gelation process, the mass fraction of glycerol polyoxyethylene ether is 0.5‰, and continue heating and stirring;

[0020] 5) Keep the temperature of the colloid in step 4) at 80°C and continuously add nitric acid solution dropwise until the gel is dissociated, and control the pH value of the aluminum sol at 1.5.

[0021] The stabilization time is 1.5h.

Embodiment 2

[0023] A method for preparing a fast-stable alumina sol, comprising the following steps:

[0024] 1) Heat deionized water to 90°C;

[0025] 2) Add pseudo-boehmite powder to deionized water, with Al 2 o 3 Meter, the concentration is 180g / L, stirring and pulping;

[0026] 3) Add 25% nitric acid to the slurry prepared in step 2) in an amount of 100g / L to gel;

[0027] 4) Add glycerol polyoxyethylene ether during the gelation process, the mass fraction of glycerol polyoxyethylene ether is 2‰, and continue heating and stirring;

[0028] 5) Keep the temperature of the colloid in step 4) at 90°C and continuously add nitric acid solution dropwise until the gel is dissociated, and control the pH value of the aluminum sol at 2.2.

[0029] The stabilization time is 4h.

Embodiment 3

[0031] A method for preparing a fast-stable alumina sol, comprising the following steps:

[0032] 1) Heat deionized water to 85°C;

[0033] 2) Add pseudo-boehmite powder to deionized water, with Al 2 o 3 Meter, the concentration is 150g / L, stirring and pulping;

[0034] 3) Add 20% nitric acid to the slurry prepared in step 2) in an amount of 80g / L to gel;

[0035] 4) Add glycerol polyoxyethylene ether during the gelation process, the mass fraction of glycerol polyoxyethylene ether is 0.5~2‰, and continue heating and stirring;

[0036] 5) Keep the temperature of the colloid in step 4) at 85°C and continuously add nitric acid solution dropwise until the gel is dissociated, and control the pH value of the aluminum sol at 2.0.

[0037] The stabilization time is 3h.

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Abstract

The invention discloses a fast stabilization preparation method of alumina sol. The fast stabilization preparation method comprises the following steps of: 1) heating deionized water to 80-90 DEG C; 2) adding pseudo-boehmite powder into the deionized water, enabling the concentration to be 100-180g / L (calculated by Al2O3), and stirring for pulping; 3) adding 18-25% of nitric acid into the pulp prepared in the step 2), enabling the adding quantity to be 60-100g / L, and performing gelation; 4) adding an oleate type nonionic surfactant during the gelation process, and continuously heating and stirring; and 5) keeping the temperature of the colloid in the step 4) at 80-90 DEG C, continuously dripping a nitric acid solution till dispergation, and controlling the pH value of aluminum sol at 1.5-2.2. Compared with the prior art, according to the preparation method disclosed by the invention, the deionized water is preheated, and the time for preparing the alumina sol is saved during industrial production; and glycerin polyoxyethylene ether is added, thus the dispergation process is accelerated, and the stabilization time of the alumina sol is shorted to 1.5-4h.

Description

technical field [0001] The invention relates to a preparation method of alumina sol, in particular to a preparation method of fast and stable alumina sol. Background technique [0002] Alumina sol is an ingredient and binder for automotive catalyst carriers. The performance of alumina sol directly affects the stability and coatability of alumina slurry, determines the specific surface area of ​​alumina coating and the bonding strength between coating and carrier, and ultimately affects the initial activity and light-off of automotive catalysts. Temperature and service life, etc. have a decisive influence. Therefore, the performance of alumina sol is a key factor in the preparation of automotive catalysts. [0003] The method of industrial production of alumina sol usually uses pseudo-boehmite as raw material to prepare alumina sol by acid hydrolysis, but the existing method takes a long time to prepare alumina sol, especially the stability time of alumina sol is long. Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 行世军
Owner 河南省格林沃特环保科技有限公司