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Preparation method of alumina supporter with large porosity and high mechanical strength

A technology of alumina carrier and mechanical strength, which is applied in the direction of catalyst carrier, chemical instruments and methods, chemical/physical processes, etc. It can solve the problems of low mechanical strength of alumina carrier and insufficient pore size, so as to reduce the force and improve the catalytic performance. Activity, the effect of saving production cost

Active Publication Date: 2018-11-23
SINOCHEM QUANZHOU PETROCHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to propose a simple and effective solution to the problems of insufficient pore volume or pore diameter of the existing alumina carrier, or low mechanical strength of the alumina carrier after physical and chemical method expansion. Alumina carrier with large pore size, large pore volume and high mechanical strength

Method used

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  • Preparation method of alumina supporter with large porosity and high mechanical strength

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Embodiment 1

[0033] Weigh 204.0 g of pseudo-boehmite (produced by Nanhan Chemical Co., Ltd., the particle diameter is about 8 Å), add 4.5 g of scallop powder, and knead for 5 min at a speed of 50 r / min. Weigh 68 wt% of concentrated nitric acid and add it into 210 g of deionized water to prepare a dilute solution. The amount of nitric acid used is 3.0 wt%. After the powder kneading is completed, the above dilute nitric acid solution will be slowly added for 2.5 minutes, and then kneaded for 8 minutes to obtain the glued pseudo-boehmite. Then, the glued pseudo-boehmite was extruded using a four-leaf clover mold (Φ1.45 mm) at a speed of 50 r / min and a power of 130 W. Place the extruded strips at room temperature to dry for 2 hours, then put them in an oven at 120 °C, dry them for 2 hours, take them out for shaping, the speed is 400 r / min, and the length of the carrier after shaping is 0.8-1 cm. Then use a 20-mesh sieve to sieve. The roasting process adopts three-stage roasting, the first s...

Embodiment 2

[0035] Weigh 204.0 g of pseudo-boehmite (produced by South Korea Chemical Co., Ltd., the particle diameter is about 8 Å), 4.5 g of scallop powder, and knead for 5 min at a speed of 50 r / min. Nitric acid with a concentration of 68.0% was weighed and slowly added to 210 g of deionized water to prepare a dilute solution. The amount of nitric acid used was 3.0 wt%. Slowly add the dilute acid solution to the kneaded boehmite for 2.5 minutes, and keep kneading for 10 minutes to make the pseudo-boehmite fully glued into a ball, and then put it in the extruder and extrude it into strips, using a four-leaf Straw mold (Φ1.45 mm) was used to extrude the strands at a speed of 50 r / min and a power of 150 W. After extruding, let it stand at room temperature in a dark place for 336 h, take it out and dry it at 120 °C for 2 h, then carry out shaping at a speed of 450 r / min. After shaping, the length of the carrier is between 0.8-1 cm, placed in a 20-mesh standard sieve, and then put into a m...

Embodiment 3

[0037] Weigh 153.0 g of pseudoboehmite (produced by South Korea Chemical Industry Co., Ltd., the particle diameter is about 8 Å), weigh 47.0 g of PURALSB powder (produced by Sasol Germany, the grain size is 45-60 Å), and weigh the field cyanine powder 4.5 g, knead the above three for 5 min at a speed of 50 r / min. Nitric acid with a concentration of 68.0% was weighed and slowly added to 210.0 g of deionized water to prepare a dilute solution. The amount of nitric acid used was 3.0 wt%. As mentioned above, add the dilute acid solution to the kneaded pseudo-boehmite, continue kneading for 8-10 minutes to obtain a sticky pseudo-boehmite, place it in the extruder and extrude it, and the speed is 50 r / min, the power is 140 W, after the completion, it is placed at room temperature to dry for 2 h, and the strips are extruded in the form of four leaves, and the mold is Φ1.45 mm. Then put it in an oven at 120°C, dry for 2 hours, take it out, and shape it at a speed of 425 r / min. After ...

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Abstract

The invention discloses a preparation method of an alumina supporter with the large porosity and high mechanical strength. Pseudo-boehmite and herba sesbaniae cannabinae powder are taken as raw materials, a peptizing agent is added, the mixture is subjected to extrusion molding, drying and three-section roasting, and the alumina supporter is obtained, wherein the crystal form structure is delta crystal form. The three-section roasting process comprises the steps that in the first section, the temperature is increased to be 850 DEG C from room temperature, and the temperature rising rate is 10DEG C / min; in the second section, the temperature is increased to be 900 DEG C from 850 DEG C, and the temperature rising rate is 5 DEG C / min; and in the third section, the temperature of 900 DEG C ismaintained for 4 hours. The pore diameter of the prepared alumina supporter is maintained between 150 and 200, the strength can reach 250 N / cm or above, the stacking density is lower than 0.60 g / mL,mass transfer of diffusion of macromolecular reactants is facilitated, and the catalytic activity of unit metal active site is improved.

Description

technical field [0001] The invention belongs to the technical field of alumina carrier preparation, and in particular relates to a method for preparing an alumina carrier with large aperture and high mechanical strength. Background technique [0002] Alumina materials have the advantages of large specific surface area, good thermal stability, low price, high mechanical strength, and easy molding. Therefore, they are used as one of the most commonly used industrial catalyst supports and are widely used in petrochemical fields such as diesel hydrotreating. Pseudo-boehmite is usually used in industry to prepare alumina support. [0003] Pseudo-boehmite is dehydrated and gradually transformed into the most stable crystalline phase α-alumina under high-temperature calcination conditions. In this process, different types of alumina crystal forms can be obtained by controlling different conditions such as temperature, pressure, and water vapor partial pressure, generally η, γ, θ, ...

Claims

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Application Information

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IPC IPC(8): B01J21/04B01J32/00B01J35/10
CPCB01J21/04B01J35/31B01J35/635B01J35/647B01J35/615
Inventor 孙杰路蒙蒙刘长坤
Owner SINOCHEM QUANZHOU PETROCHEM CO LTD
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