LT4384B - Process for the preparation of aluminium hydroxychloride - Google Patents

Abstract

Invention belongs to aluminium oxychloride manufacturing technology that may be used for wastewater treatment. The aluminium oxychloride is being produced by mixing aluminium hydroxide with salt acid at 1/4-4.5 ratio and sulphur acid is being used as reaction initiator, amount of which is 1.5-2 per cent of the non-reacting substance total mass. Before introducing initiator into reaction it is being dissolved in salt acid and substance containing aluminium is being introduced into reactor at a solvent temperature not less than as 40 degrees by Celsius. Letting steam of 100-110 degrees by Celsius temperature through water over barboter and maintaining pressure in the reactor at 1-1.03 ata. Mixing is provided by oxygen containing gases, air, for instance. Using this production method of aluminium oxychloride does not release hydrogen and there is no blast danger.

Description

There are known methods wherein the starting aluminum hydroxide suspension was stirred with sulfuric acid, and performs the process from 130 to 200 "C for ¹ [SB 450780 G 01F 7/00] disadvantage of this process - and the necessary high temperature under high pressure.

There are known methods of using hydrochloric acid and ferric oside and trivalent titanium [JP 93 - 314791 C 01F 7/00] for the production of aluminum oxychioride, and in the invention [WO 9511197 C 01F 7/00] polyaluminium chloride. These techniques also require high temperatures.

There are methods where pure aluminum is used and the latter interacts with a solution of aluminum chloride in hydrochloric acid [JP 70 - 452645 C 01F 7/56]. The disadvantage of this method is that it uses a very expensive raw material, aluminum.

The general disadvantage of the above techniques is that hydrogen is released during the process, which poses a major explosion hazard.

The disadvantages mentioned in the patented invention are avoided by mixing aluminum hydroxide with hydrochloric acid and sulfuric acid in an amount of 1.5 to 2% by weight of the reactants, reactant interaction at a pressure of 1 -1.03 and 100-110 At a temperature of 0 ° C, the mixture is circulated. Prior to the introduction of the reaction zone, the initiator is dissolved in hydrochloric acid and the aluminum-containing material is introduced into the reactor at a solution temperature of at least 40 ^u G, the reagent water is introduced in the form of steam and the reactants are mixed with gas containing oxygen such as air.

The method is implemented as follows.

The aluminum hydroxide Al (OH) _{3 is} mixed with hydrochloric acid and the reaction initiator mixture in a ratio of 1: 4 to 4.5, for example sulfuric acid, 1.5 to 2% by weight of the reactants. Sulfuric acid accelerates the onset of a chemical reaction

Al (OH) ₃ + 3HCl H ₂ SO ₄ Al Ci ₃ + 3 H ₂ O (1)

AlC-b + H ₂ O - »A1 (OH) C1 ₂ + HCl!

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The process is as follows. The reactor is fed with a 1: 4 -f 4.5 mixture of sulfuric and hydrochloric acid into the reactor, and aluminum hydroxide is introduced when the temperature of the mixture in the reactor is at least 40 ° C. The temperature in the reactor is raised by supplying water vapor from 100 to 110 ° C through a bubbler. The pressure in the reactor is maintained between 1 and 1.03 ata. Agitation of the reactants is effected with oxygen-containing gases such as air. The reaction is terminated when the pH of the reaction mixture is at least 0.8 and the density is 1.21 g / cm ³ . After the reaction, the final quality of the product is checked in the laboratory, that is, by weight and pH and density of AI ₂ Qs,

Sample kg of aluminum hydroxide, 4 kg of hydrochloric acid and 0.075 kg of sulfuric acid are mixed in a bubbler with water vapor at 100 ° C. The reactor is maintained at a pressure of 1 ata, and the agitation is performed by air. The reaction mixture was completed at pH = 0.8, density 1, .21 g / cm ³ , reaction time 40 min, yield 4.94 kg of aluminum oxychloride.

Sample kg of aluminum hydroxide, 4.3 kg of hydrochloric acid and 0.09 kg of sulfuric acid are mixed in a bubbler with water vapor at 105 ° C. The reactor is maintained at a pressure of 1.02 ata. The mixing process is performed by air. The reaction was completed at pH 1.3, density

1.23 g / cm ³ , reaction time 30 min, yield 5.23 kg aluminum oxychloride.

Example I per kilogram of aluminum hydroxide, 4.5 kg of hydrochloric acid and 0.11 kg of sulfuric acid mixed with 110 ^u Barbot C water vapor. The reactor maintains a pressure of 1.03 ata. The mixing process is performed by air. The reaction was completed at pH = 1.5, density 1.25 g / cm ³ , reaction time 28 min. yield of aluminum chloride 5.43 kg, v

In this way, the production of aluminum oxychloride does not release hydrogen and there is no risk of explosion. As the pH increases, the efficiency of aluminum chloride as a reagent increases. that is, lower doses of coagulant provide a smoother clearing of water and increased transport and storage safety.

The results of the examples presented in the alumina production process are shown in the following table

Pa- virgin dys Quantity of material, kg Steam tempe- ratification, ° C Pressure, ata Reaction- cations duration, min pH density, g / cm ³ Yield, kg Al (OH) ₃ HCl H ₂ SO ₄ 1 1 4 0.075 100 1 40 0.9 1.21 4.94 2 1 4.3 0.09 105 1.02 30th 1.3 1.23 5.23 3 1 4.5 0.11 110 1.03 28th 1.5 1.25 5.43

Claims (4)

Definition of the Invention A process for the production of aluminum oxychloride using annual aluminum, aluminum compounds or aluminum hydroxide, by mixing the compounds with hydrochloric acid and water using a reaction initiator and filtration, characterized in that the reactants are interacted at a pressure of from 1 to i, 03 at 100 up to 110 ° C with stirring. Process for the production of aluminum oxychloride according to claim 1, characterized in that the process is carried out by sulfuric acid in an amount of from 1.5 to 2% by weight of the reactants. S. A process for the production of aluminum oxychloride according to claims 1 and 2, characterized in that it is dissolved in hydrochloric acid prior to the introduction of the initiator and the aluminum-containing material is introduced into the reactor at a temperature of at least 40 ° C. A process for the production of aluminum oxychioride according to claims 1 to 3, characterized in that the water is introduced in the form of a vapor and the mixing is carried out with oxygen-containing / * 31 «r r» · * MUJ VHU-O. 5. A process for the production of aluminum oxychioride according to claim 4, wherein the reactants are air-stirred.