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Prepn. process of alumina carrier

A technology of alumina carrier and alumina, which is applied in the direction of catalyst carrier, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of channel collapse, carrier pore volume reduction, strong acid strength, etc., and achieve the effect of eliminating damage

Inactive Publication Date: 2003-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem that the aluminum oxide carrier that prepares by above-mentioned disclosed method exists is, (1) the acid strength of mineral acids such as nitric acid is very strong, is easy to constitute damage to the pore structure of aluminum oxide monohydrate; (2) the prepared carrier is dry and During the calcination process, due to the crusting phenomenon on the surface of the alumina carrier, part of the pores collapsed, thereby reducing the pore volume of the carrier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 600ml of acidic aqueous solution containing 50g of nitric acid was added to 700ml of alkaline solution containing 30g of ammonium carbonate and mixed, and then added to 500g of alumina monohydrate dry rubber powder. Mix for 25 minutes, heat up to 100°C, keep the temperature for 1.5 hours, mix for 30 minutes, then add 600g of alumina monohydrate dry rubber powder and 15g of butanol to it, knead the material into a plastic body, and use F- 26-type extruder and a diameter of 1.0mm cylindrical die extrusion. After extruding, it was dried at 130°C for 5 hours, then raised to 800°C at a rate of 280°C / hour in an air atmosphere, and calcined at a constant temperature for 6 hours to obtain alumina carrier A.

example 2

[0025] Add 620ml of acidic aqueous solution containing 45g of acetic acid to 670ml of alkaline solution containing 35g of ammonium acetate, add it into 400g of alumina monohydrate dry rubber powder weighed, mix for 20 minutes, heat to 120°C, and the constant temperature time is 1.0 Hour. Mix for 30 minutes, then add 600g of alumina monohydrate dry rubber powder and 20g of isopropanol to make the material mix into a plastic body. Then use the F-26 type extruder and a diameter of 1.0mm cylindrical die to extrude. After extruding, dry at 75°C for 3 hours and at 105°C for 6 hours. Then raise the temperature to 900° C. at a rate of 230° C. / hour under an air atmosphere, and calcine at a constant temperature for 1.5 hours to obtain an alumina carrier B.

example 3

[0027] 550ml of acidic aqueous solution containing 49g of formic acid was added to 600ml of alkaline solution containing 40g of ammonium carbonate and mixed, and added to weighed 300g of alumina monohydrate dry rubber powder. Mix for 20 minutes and warm to 150°C for 0.5 hours. Mix for 30 minutes, then add 700g of alumina monohydrate dry rubber powder and 20g of ethanol, and knead to make the material into a plastic body. Then use the F-26 type extruder and a diameter of 1.0mm cylindrical die to extrude. After extruding, dry at 60°C for 4 hours and at 90°C for 5 hours. Then raise the temperature to 1000° C. at a rate of 200° C. / hour under an air atmosphere, and bake at a constant temperature for 1 hour to obtain an alumina carrier C.

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Abstract

The invention discloses a method for preparing an alumina carrier. A weakly acidic peptizer is used to prepare the alumina carrier, and alumina monohydrate and alcohol compounds are added in stages to increase the pore volume of the alumina carrier. The large pore volume alumina carrier prepared by the method of the present invention is characterized in that: the phase structure is θ-AL2O3; the pore volume is at least 0.90ml / g, generally 0.925~0.9550ml / g, and the surface area is 100~240m2 / g , preferably 150-240m2 / g, especially suitable as a carrier for heavy and residual oil hydrogenation catalysts.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, in particular to a method for preparing an alumina carrier for a hydrotreating catalyst. Background technique [0002] Today, the world's crude oil is gradually becoming heavier, and the market demand for light oil products is growing rapidly. The deep processing and utilization of heavy oil has been paid special attention worldwide. One of the keys to heavy oil hydroprocessing technology is to develop catalysts with excellent performance. Its performance not only depends on the type and content of the active metal and the chemical state of the active species, but also is closely related to the pore structure of the catalyst support. For heavy oil hydrodemetallization and desulfurization, having a large pore volume is an important factor for the catalyst to maintain a long life. ensure. [0003] U.S. Patent No. 5,215,955 discloses a method for preparing an alumina carrier. The main s...

Claims

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Application Information

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IPC IPC(8): B01J21/12B01J32/00
Inventor 刘喜来赵愉生张雪梅
Owner CHINA PETROLEUM & CHEM CORP