Preparation method of silica gel carrier for loading in olefin catalysis

A technology of silica gel and carrier, applied in the direction of catalyst carrier, chemical instruments and methods, silicon oxide, etc., can solve the problems of long time for distilling and removing water, cumbersome operation steps, large solvent consumption, etc., and achieve improvement of pore volume and distribution, preparation Simple operation and good repeatability

Active Publication Date: 2019-06-04
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 15 ml of an aqueous ammonia solution with a concentration of 2.0 mol / L into the closed reactor, turn on the stirring, and raise the temperature to 50°C. Add 1.2 mol / L sodium silicate aqueous solution and 1.22 mol / L sulfuric acid aqueous solution in parallel at a flow rate of 3ml / min, and simultaneously add an ethanol aqueous solution with a mass fraction of 8% sodium carbonate at a flow rate of 6ml / min (volume ratio of ethanol to water) 18ml of a mixed aqueous solution of magnesium nitrate and aluminum nitrate with a mass fraction of 1:6) and a mass fraction of 6% (the molar ratio of the two nitrates is 1:1). When the pH value of the solution in the reactor reaches 11, stop adding the above-mentioned mixed aqueous solution. Constant temperature reaction for 2.5h. Add an aqueous solution of n-butanol sulfate with a concentration of 1.2 mol / L at a flow rate of 5 ml / min (the volume ratio of n-butanol to water is 1:10), and stop adding the n-butanol sulfate aqueous solut...

Embodiment 2

[0040] The preparation process is the same as in Example 1, except that 18 ml of an aqueous solution of ammonium bicarbonate with a concentration of 2.3 mol / L is added to the closed reactor, the stirring is turned on, and the temperature is raised to 50°C. Other conditions are the same as in Example 1. The test results are shown in Table 1.

Embodiment 3

[0042] The preparation process is the same as in Example 1, except that 15 ml of an aqueous ammonia solution with a concentration of 2.0 mol / L is added to the closed reactor, the stirring is turned on, and the temperature is raised to 50°C. Add 1.2mol / L potassium silicate aqueous solution and 1.22mol / L sulfuric acid aqueous solution in parallel at a flow rate of 3ml / min, and simultaneously add an ethanol aqueous solution with a mass fraction of 8% potassium carbonate at a flow rate of 6ml / min (volume ratio of ethanol to water) 18ml of a mixed aqueous solution of zinc nitrate and aluminum nitrate with a mass fraction of 1:6) and a mass fraction of 6% (the molar ratio of the two nitrates is 1:1.3). When the pH value of the solution in the reactor reaches 11, stop adding the above-mentioned mixed aqueous solution. Constant temperature reaction for 2.5h. Other conditions are the same as in Example 1. The test results are shown in Table 1.

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PUM

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Abstract

The invention relates to a preparation method of a silica gel carrier for loading olefin catalysis. The silica gel carrier adopts silicate and an inorganic acid as raw materials. The preparation method comprises the following steps: an aqueous solution of an alkaline medium is used as a base liquid, an aqueous solution of the silicate and an aqueous solution of the inorganic acid are added in a parallel flow manner, an ethanol-water solution of alkali metal carbonate and a mixed aqueous solution of two nitrates are added in a parallel flow manner, an organic alcohol-water solution of the inorganic acid is added, and the silica gel product is obtained after a hydrothermal reaction, acidification, washing, drying and activation. The method can greatly improve the specific surface area of the silica gel without affecting the pore volume of the silica gel, so the basic physical properties of the silica gel carrier are improved.

Description

Technical field [0001] The invention relates to a method for preparing a silica gel carrier, in particular to a method for preparing a silica gel carrier for olefin catalytic loading. Background technique [0002] Silica gel has a special pore structure and excellent thermal stability. It 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 methods for preparing silica gel. The most common one is that silicate and inorganic acid are used as raw materials to react at a certain pH value to form a gel, and then undergo aging, water washing, pickling, drying and other processes to obtain silica gel. [0003] As a catalyst carrier, silica gel with suitable pore volume, pore size and distribution, high specific surface area can greatly increase the catalyst activity. When preparing carrier silica gel by traditional methods, in order to obtain a high specific su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16C01B33/145C01B33/155B01J32/00B01J21/08B01J35/10
CPCY02P20/52
Inventor 王海王玲玲刘小燕张鹏刘文霞任峰徐人威陈旭陈雪蓉郝萍李忠
Owner PETROCHINA CO LTD
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