Alumina carrier and preparation method thereof

An alumina carrier, alumina technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of particle size distribution dispersion, non-uniform crystal nuclei, incomplete crystal grains, etc.

Active Publication Date: 2016-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above method adopts the ordinary neutralization method, and the reaction environment is not uniform. This method is easy to form a large number of non-uniform crystal nuclei, so that the prepared alumina has low crystallinity, dispersed particle size distribution, and incomplete crystal grains. phenomenon; secondly, the alumina obtained by conventional methods often has a relatively uniform distribution of additives on the particles.
At present, there are few reports on the preparation method of alumina with gradient distribution of additive percentage

Method used

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  • Alumina carrier and preparation method thereof
  • Alumina carrier and preparation method thereof
  • Alumina carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This example introduces the preparation method of Mo, Ni, P original solution. In this example, only one original solution of Mo, Ni, and P with one concentration and ratio is prepared, and solutions with other ratios and concentrations can be prepared according to the method introduced.

[0062]Take 386g of molybdenum oxide and 123g of basic nickel carbonate into a multi-necked flask, add a certain amount of deionized water, stir until the substance in the bottle is slurry, then slowly add 86g of phosphoric acid, and then heat slowly after the initial reaction , keep the solution temperature at 90-110° C. for 1-3 hours, stop heating, and filter the obtained solution while it is hot to obtain a clear dark green original solution. The solution composition is MoO 3 : 69.27g / 100ml; NiO: 12.49g / 100ml; P: 4.10g / 100ml.

Embodiment 2

[0064] Add bottom water to the bottom of the impingement flow reactor, and heat to 90°C; start the impingement flow reactor, and adjust the frequency of the ultrasonic generator to 20kHz. Adjust the impact direction of the two accelerator tubes to be horizontal, and the accelerator will contain Na 2 SiO 3 Solution (concentration 30g / 100ml) of 30g / 100mL AlCl 3 The solution is injected from the feed port I at a flow rate of 15L / h, and after the liquid is atomized through the pressure atomization nozzle, the acceleration tube at the feed port II level with it sprays out the concentration injected at a flow rate of 20L / h through the pressure atomization nozzle 35g / 100mL NaAlO 2 The solutions collided with each other, reacted for 30 minutes, and stopped injecting liquid and the bottom ultrasonic generator; at the same time, the feeding ports III and IV at both ends of the liquid-liquid reactor II were simultaneously fed with NaAlO 2 (concentration of 40g / 100ml) and Na 2 SiO 3 ...

Embodiment 3

[0066] Add bottom water to the bottom of the impingement flow reactor, and heat to 90°C; start the impingement flow reactor, and adjust the frequency of the ultrasonic generator to 30kHz. Adjust the impact direction of the two accelerator tubes to be horizontal, and the accelerator will contain ZrCl 4 The concentration of the solution (25g / 100ml) is 30g / 100mL of AlCl 3 The solution is injected from the feed port I at a flow rate of 20L / h, and the liquid is atomized through the pressure atomization nozzle. 35g / 100mL of NaAlO 2 The solutions collided with each other, reacted for 25min, stopped injecting the liquid and the bottom agitator; at the same time, the feed ports III and IV at both ends of the impingement flow reactor were continuously fed with NaAlO at the same time at 16L / h. 2 (Concentration is 45g / 100mL), AlCl 3 (Concentration is 40g / 100mL) and ZrCl 4 (concentration of 20g / 100ml) mixed solution, adjust the pH value to 7.0, after 5 minutes of neutralization reactio...

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Abstract

The invention discloses an alumina carrier and its preparation method. With the weight of the carrier as the basis, auxiliaries account for 2-5% when metered on the basis of oxide. The auxiliaries are one or two elements selected from silicon or zirconium; content of silicon or zirconium in alumina decreases progressively from the center of carrier particles to the external surface; content of silicon and/or zirconium at the particle center is 1.5-3.5 wt%; content of silicon and/or zirconium at 1/3 of R is 0.5-1.5 wt%; and content of silicon and/or zirconium at 2/3 of R is 0.1-0.5 wt%, wherein R is radius of the carrier particle with the alumina center as the starting point. The alumina carrier has high degree of crystallinity, complete crystalline grain and centralized particle size distribution. Distribution of the auxiliaries in alumina decreases gradiently. The alumina carrier is suitable for preparation of a hydrotreating catalyst with high demetalization and good metal-holding capabilities.

Description

technical field [0001] The invention relates to an alumina carrier and a preparation method thereof, in particular to an alumina carrier with a gradient distribution of additive percentages and a preparation method thereof. Background technique [0002] Crude oil and distillates derived from crude oil contain impurities such as sulfur, nitrogen, oxygen and metals. The existence of these impurities not only affects the stability of the oil, but also emits SO during use. X , NO X and other harmful gases pollute the environment. During the secondary processing of oil products, the presence of impurities such as sulfur, nitrogen, oxygen and metals can poison catalysts. Therefore, removing the above-mentioned impurities is an important process in oil processing. Distillate oil hydrotreating refers to the process of contacting raw oil and hydrogen with a catalyst at a certain temperature and pressure to remove impurities and saturate aromatics. [0003] Alumina is widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/08
Inventor 吕振辉彭绍忠高玉兰张学辉徐黎明佟佳
Owner CHINA PETROLEUM & CHEM CORP
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