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Green technology for synthesizing ammonium aluminum carbonate hydroxide and pyrolysis thereof to prepare high specific surface alumina

A technology of aluminum ammonium carbonate and green technology, which is applied in the fields of aluminum carbonate compound, alumina/hydroxide preparation, inorganic chemistry, etc., can solve the problems of excessive waste liquid and failure to realize waste liquid recycling, and achieve no waste liquid discharge , reduce emissions and reduce energy consumption

Inactive Publication Date: 2019-02-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the synthesis process does not realize the recycling of waste liquid, a lot of waste liquid will be generated in the industrial production process and needs to be treated.

Method used

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  • Green technology for synthesizing ammonium aluminum carbonate hydroxide and pyrolysis thereof to prepare high specific surface alumina
  • Green technology for synthesizing ammonium aluminum carbonate hydroxide and pyrolysis thereof to prepare high specific surface alumina
  • Green technology for synthesizing ammonium aluminum carbonate hydroxide and pyrolysis thereof to prepare high specific surface alumina

Examples

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Effect test

Embodiment 1

[0020] Example 1: At room temperature, prepare an ammonium carbonate solution with a concentration of 10.5 mol / L, then add a certain amount of pseudo-boehmite according to the molar ratio of ammonium carbonate to Al of 15, and stir for 30 minutes until the solution is uniform. Transfer the uniform turbid liquid into a crystallization kettle for crystallization at 100°C for 24 hours, filter and wash the crystallized solid, and dry it at 100°C for 12 hours to obtain ammonium aluminum carbonate, which is designated as AACH-A. The resulting liquid is marked as mother liquor (1). The obtained AACH-A specific surface area is 732.7m 2 g, total pore volume 0.4cm 3 g, the average pore diameter is 2.4nm. The resulting AACH-A in N 2 In the atmosphere, the temperature was raised to 300°C at a rate of 2°C / min, and then roasted at a constant temperature for 2 hours, and then the temperature was raised to 500°C in a muffle furnace at a rate of 2°C / min, and roasted at a constant temperatur...

Embodiment 2

[0024] Example 2: At room temperature, prepare a urea solution with a concentration of 10.5 mol / L, then add a certain amount of pseudo-boehmite according to the molar ratio of urea to Al of 15, and stir for 30 minutes until the solution is uniform. Transfer the uniform turbid liquid into a crystallization kettle for crystallization at 100°C for 24 hours, filter and wash the crystallized solid, and dry it at 100°C for 12 hours to obtain ammonium aluminum carbonate, which is designated as AACH-B. The resulting liquid is marked as mother liquor ①. The obtained AACH-B specific surface area is 724.6m 2 g, total pore volume 0.4cm 3 g, the average pore diameter is 2.4nm. The resulting AACH-B in N 2 In the atmosphere, the temperature was raised to 300°C at a rate of 2°C / min, and then roasted at a constant temperature for 2 hours, and then the temperature was raised to 500°C in a muffle furnace at a rate of 2°C / min, and roasted at a constant temperature for 3 hours, the obtained Al ...

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Abstract

The present invention discloses a green technology for synthesizing ammonium aluminum carbonate hydroxide and a pyrolysis thereof to prepare high specific surface alumina. The green technology comprises the following steps: a, ammonium salts (ammonium carbonate and ammonium hydrogencarbonate) or amide compounds (formamide, acetamide, urea, etc.) are used as a modifier to prepare a clarified solution; b, pseudo-boehmite is added to the clarified solution in the step a at a certain molar ratio, the materials are stirred until the solution is uniform, then the solution is transferred to a crystallization kettle, crystallized solids are washed and dried to obtain the ammonium aluminum carbonate hydroxide (AACH), and obtained mother liquor is recycled for use; c, after the mother liquor obtained in step b is cooled, a certain amount of the modifier is supplemented for use, and the step b is repeated; and d, the ammonium aluminum carbonate hydroxide is pyrolyzed to obtain the high specific surface alumina. The AACH synthesized by the provided method for synthesizing the ammonium aluminum carbonate hydroxide has a specific surface as high as 812.5 m<2>g, after high temperature calcinations, the obtained alumina still has a relatively high specific surface (681.8 m<2> / g), and the green technology realizes the recycling of the mother liquor after reaction, and is free of waste liquid discharge, energy-saving and environmentally protective.

Description

technical field [0001] The invention relates to a green process for synthesizing basic aluminum ammonium carbonate and its pyrolysis to prepare high-surface alumina, using pseudo-boehmite as the aluminum source, and using ammonium salts (ammonium carbonate, ammonium bicarbonate) or amide compounds ( formamide, acetamide, urea, etc.) as modifiers, the hydrothermal method is used to prepare basic ammonium aluminum carbonate, and the obtained mother liquor is recycled indefinitely to achieve no waste liquid discharge. Background technique [0002] Due to the special physical and chemical properties and commercial value, the thermal stability and optical properties of nano-sized alumina powder have attracted more and more attention from researchers. Ammonium aluminum carbonate is widely used as an important precursor for preparing alumina powder. A new synthetic method for preparing high-purity alumina by basic ammonium aluminum carbonate pyrolysis has become a research focus b...

Claims

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Application Information

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IPC IPC(8): C01F7/00C01F7/30
CPCC01F7/30C01P2002/72C01P2006/12C01P2006/16C01P2006/17C01F7/782
Inventor 白鹏王悦吴萍萍衣启松阎子峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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