Method and technique for preparing Nano type sol of polyaluminium chloride in high purity

A polyaluminum chloride, nano-type technology, applied in aluminum chloride, aluminum halide and other directions, can solve the problems of harsh reaction conditions, low content, increase production cost, etc., and achieve the effects of low cost and simple reaction equipment

Inactive Publication Date: 2006-07-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0003] In the 20th century, the accuracy limited to the resolution of the NMR spectrometer ( 27 Al NMR), unable to decipher the sol form in the high-concentration polymerized aluminum solution, it has always been considered that the Al with Keggin structure 13 The hydrolyzed aggregated form is the dominant form in polyaluminum chloride solution, ignoring the Al 13 The shape of the sol formed by aggregation is important, thus limiting the application range of high-concentration aluminum sol products
[0005] Affect the nano-morphology of Al in polyaluminum solution 13 and Al 30 The main factors of the content are alkalization degree, preparation temperature, alkali addition rate, etc., and its optimal alkalization degree is about 75%, and the lower the preparation temperature is, the more beneficial it is to prevent Al 13 and Al 30 Equal to high polymerization form conversion, slow addition of alkali is beneficial to Al 13 and Al 30 generation, but too slow alkali addition rate will reduce equipment capacity and increase production cost
[0006] At present, high-purity polyaluminum chloride sol is mainly prepared by refluxing metal aluminum with hydrochloric acid or aluminum trichloride solution for a long time at high temperature (USP3535268, USP3340205). However, due to uncontrollable reaction rate and long heating time in this production method, the The prepared polyaluminum chloride sol has high polymer content, and the nano-sized Al 13 and Al 30 The content is low, and the production cost of using high-purity aluminum as raw material is high
Chinese patent CN1101622A reports the use of Al 2 o 3 ·H 2 O is used as a raw material, and the polymerized aluminum sol is obtained by acidolysis and peptization of a mixture o...

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  • Method and technique for preparing Nano type sol of polyaluminium chloride in high purity
  • Method and technique for preparing Nano type sol of polyaluminium chloride in high purity
  • Method and technique for preparing Nano type sol of polyaluminium chloride in high purity

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example 1

[0030]Add 225L of hydrochloric acid with a concentration of 31% into the second-stage acid-dissolving kettle 1a, and at the same time add 78kg of aluminum hydroxide returned from the filter tank 3a, stir and heat up to 95°C, and react for 2 hours; after the reaction, put the reactants into the first-stage acid-dissolving kettle 1b Add 115kg of active aluminum hydroxide, stir and heat up to 95°C for 1hr, add 445kg of water to adjust the total aluminum concentration of the solution, continue stirring and reacting at 95°C for 1hr, cool down after the reaction, filter in the filter tank 3a, and return the filter residue to the second Section continues to carry out acid-dissolution reaction, makes filtrate 818kg, puts into low alkalization polyaluminum chloride storage tank 4a, and total aluminum concentration is 9.2%, and alkalization is 51.8%; 818kg low alkalization polyaluminum chloride Pump into the alkali adjustment kettle 1c, add 64kg of high-purity calcium aluminate, stir and...

example 2

[0032] Add 365L of hydrochloric acid with a concentration of 20% into the second-stage acid-dissolving kettle 1a, and at the same time add 78kg of aluminum hydroxide returned from the filter tank 3a, stir and heat up to 95°C, and react for 2.5hr; after the reaction is completed, put the reactants into the first-stage acid-dissolving kettle In 1b, add 115kg of active aluminum hydroxide, stir and heat up to 90°C for 1.5hr, add 330kg of water to adjust the solution to the required total aluminum concentration, continue stirring and reacting at 90°C for 1hr, cool down after the reaction, and filter in the filter tank 3a , the filter residue returns to the second section to continue the acid-dissolving reaction, and 843kg of filtrate is obtained, which is put into the low alkalization polyaluminum chloride storage tank 4a, the total aluminum concentration is 8.6%, and the alkalization is 52.6%; the 843kg low alkalization Pump the polyaluminum chloride into the alkali adjustment kett...

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Abstract

This invention describes a process for preparing high-purity nanoscale polyalumina sols. This invention uses active aluminum hydroxide and industrial hydrochloric acid as raw materials, and adopts a two-stage reverse stripping process to produce a solution of polyaluminum chloride with an alkalinity higher than 50%, which is then increased to 70% or higher using high-purity calcium aluminate as the alkalizer. The process ensures complete stripping of the aluminum hydroxide raw material at normal atmosphere and a low temperature, thus obtaining a high-purity product. In addition, in the produced polyaluminum chloride sols the total content of nanoscale Al13 and Al30 having Keggin structure is higher than 70%, the alkalinity is 70-85% and the aluminum concentration is 10-19% (measured as Al2O3). The product is widely used as raw material for modern fine chemical binders, gluing agent for neutral paper manufacturing, intermediate or additive for modern pharmaceutical technology, coupling agent and catalyst for chemical production and flocculant for water treatment, and has potential applications in such emerging fields as inorganic nanocomposites and inorganic membrane materials.

Description

technical field [0001] The present invention relates to the preparation method and technology of inorganic macromolecule polyaluminum chloride sol, especially a kind of Al with high degree of alkalization and nano Keggin structure 13 and Al 30 The preparation method and process of high-purity nano-type polyaluminum chloride sol with high morphological content, the product is widely used as raw material for fine chemical adhesives, neutral paper sizing agent, pharmaceutical and cosmetic intermediates or additives, chemical production coupling Agents and catalysts, as well as water treatment flocculants. In addition, it has more potential application value in the fields of inorganic nanocomposite materials and inorganic membrane materials that have emerged in recent years. Background technique [0002] Polyaluminum chloride sol is a sol product obtained by hydrolysis and polymerization of high-concentration aluminum chloride solution (>2mol / L) under artificial forced hydr...

Claims

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Application Information

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IPC IPC(8): C01F7/56
Inventor 栾兆坤陈朝阳贾智萍张忠国李燕中
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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