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A kind of preparation method of silica gel carrier for olefin catalyst

A technology for olefin catalysts and silica gel, which is applied in the field of preparation of silica gel carriers for olefin catalysts, and can solve problems such as cumbersome operation steps, high energy consumption, and large solvent consumption

Active Publication Date: 2022-01-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The azeotropic distillation method has the problems of long time for distilling and removing water, expensive solvents, and high energy consumption; the organic solvent replacement method has the disadvantages of cumbersome operation steps, large solvent consumption, and difficult recovery.

Method used

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  • A kind of preparation method of silica gel carrier for olefin catalyst
  • A kind of preparation method of silica gel carrier for olefin catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Put 60ml of dilute sulfuric acid solution with a concentration of 1.1mol / L in a closed reactor, add 3.0ml of 5.0mol / L ammonia solution at 30°C to react for 20min, and raise the temperature to 50°C under stirring. Add a 1.2mol / L sodium silicate aqueous solution at a flow rate of 3ml / min, adjust the pH of the reaction solution to 7, add distilled water to disperse the sol thoroughly, and react at a constant temperature for 0.5h. Add 12mL of ethanol aqueous solution with a mass fraction of 4% slurry hydrotalcite at a flow rate of 3ml / min (the volume ratio of ethanol to water is 1:6), and react at a constant temperature for 1.0h after the addition is complete. Add a 1.2 mol / L sodium silicate aqueous solution at a flow rate of 4 ml / min, adjust the pH of the reaction solution to 11, and react at a constant temperature for 1.0 h. Add n-butanol sulfuric acid aqueous solution with a concentration of 1.0mol / L at a flow rate of 6mL / min (the volume ratio of n-butanol to water is 1:...

Embodiment 2

[0042] The preparation process is the same as in Example 1, except that 6.0 ml of 5.0 mol / L ammonia solution is added at 30°C for 20 minutes, and the temperature is raised to 50°C. Add a potassium silicate aqueous solution with a concentration of 1.2 mol / L at a flow rate of 3 ml / min, adjust the pH value of the reaction solution to 6, add distilled water to completely disperse the sol, and react at a constant temperature for 0.5 h. Other conditions are identical with embodiment 1. The test results are shown in Table 1.

Embodiment 3

[0044] The preparation process was the same as in Example 1, except that 10 mL of ethanol aqueous solution with a mass fraction of 7% slurry-like hydrotalcite was added at a flow rate of 3 ml / min (the volume ratio of ethanol to water was 1:9), and the reaction was carried out at a constant temperature for 1.0 h after the addition. Add 1.2 mol / L sodium silicate water solution at a flow rate of 4 ml / min, adjust the pH value of the reaction solution to 12, and react at a constant temperature for 1.0 h. Other conditions are identical with embodiment 1. The test results are shown in Table 1.

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Abstract

The invention relates to a preparation method of a silica gel carrier for olefin catalysts. In the preparation process of the silica gel carrier, an ethanol aqueous solution of a slurry-like hydrotalcite is added after the sol is completed, and an aqueous silicate solution and an organic alcohol of an inorganic acid are added during the gel reaction. The aqueous solution adjusts the pH value of the solution, and the preparation of silica gel is completed by a high temperature hydrothermal reaction. This process can greatly increase the specific surface area of ​​the silica gel, thereby improving the basic physical properties of the silica gel carrier.

Description

technical field [0001] The invention relates to a method for preparing a silica gel carrier for olefin catalysts, in particular to a method for preparing a silica gel carrier with a high specific surface area. Background technique [0002] Silica gel has a special pore structure and excellent thermal stability, and has been used as an adsorbent, desiccant, chromatographic column carrier, and is widely used as a catalyst carrier due to its high specific surface area. At present, there are many ways to prepare silica gel. The most common method is to use silicate and inorganic acid as raw materials, react at a certain pH value to form a gel, and then undergo aging, washing, pickling, drying and other processes to obtain silica gel. As a catalyst carrier, silica gel has a suitable pore volume, pore size and distribution, and a high specific surface area can greatly improve the catalyst activity. When the traditional method is used to prepare carrier silica gel, in order to obt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/08B01J21/14B01J32/00B01J35/10B01J37/03B01J37/10
Inventor 王海刘文霞王玲玲任峰徐人威董万卓张鹏陈雪蓉郝萍曹庚振李忠
Owner PETROCHINA CO LTD
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