RU2161126C2 - Method of production of basic aluminium chloride - Google Patents

Abstract

FIELD: inorganic chemistry, chemical technology. SUBSTANCE: liquid waste in production of isobutylbenzene with content of aluminium trichloride from 200 to 300 g/dm³ is subjected for neutralization with metallic aluminium. Finely dispersed powder of aluminium alloy containing 99.1% of aluminium and 0.9% of titanium dioxide is used as metallic aluminium source. Neutralization is carried out at 80-90 C for 1.5-2 h at continuous mixture stirring and in the molar ratios of aluminium trichloride to aluminium = (0.666-1.333):(1.333-2.666) and (0.333-0.666):(1.666-3.333) for preparing mono- and bimolar solutions of basic aluminium chloride of the grade 2/3 and 5/6, respectively. Solution of basic aluminium chloride is subjected for thermic treatment at 80-90 C and dried basic aluminium chloride is obtained. EFFECT: decreased cost of product, simplified and accelerated process. 5 cl, 1 tbl

Description

 The invention relates to a method for producing a solution of basic aluminum chloride, widely used in the purification of natural and industrial wastewater, and may find application in the paper industry, in the production of refractories, and, in particular, in the production of polycrystalline aluminum oxide fiber.

Known methods for producing a solution of basic aluminum chloride by the interaction of aluminum metal with a solution of aluminum trichloride / Japan Patent N 452645, class. C 01 F 7/56, 1970 / and by mixing aluminum hydroxide with hydrochloric acid and then neutralizing the resulting solution with aluminum metal to obtain basic aluminum chloride / USSR Copyright Certificate N 260624, cl. C 01 F 7/56, 1970 /. There is also a method of producing basic aluminum chloride by dissolving aluminum metal in a hydrochloric acid solution at 70-95 ^o C. When using 3-5% HCl, the dissolution time is more than 24 hours / US Patent No. 3691745, class. 423-462, 1975 /.

 The disadvantage of these methods is the use of scarce products, the complexity and duration of the process.

 Closest to the invention in technical essence and the achieved result is a method for producing basic aluminum chloride, in which the intensification of the process is achieved through the use of aluminum alloys as aluminum-containing raw materials / USSR Copyright Certificate N 618343, C 01 F 7/56 /. The proposed method allows to reduce the process time from 24 to 1.6-3.3 hours

 The problem solved by the invention is to reduce the cost of the product, simplify and speed up the process.

The task is achieved through the use of liquid waste from the production of isobutylbenzene with an aluminum trichloride content of 200 to 300 g / dm ³ , a mass concentration of organic impurities and suspended particles of not more than 0.5 g / dm ^3, respectively, according to TU 38.302163-89.

 As aluminum metal, finely dispersed powder of the aluminum alloy ASD-T with a content of 99.1% aluminum and 0.9% titanium dioxide is used.

The neutralization process is carried out at 80-90 ^o C for 1.5-2 hours with continuous stirring of the mixture.

 Neutralization is carried out at a molar ratio of aluminum trichloride and aluminum (0.666-1.333): (1.333-2.666) and (0.333-0.666) :( 1.666-3.333) to obtain one- and two-molar solutions of basic aluminum chloride grade 2/3 and 5/6 respectively.

 From these stoichiometric ratios, it follows that when receiving a two-molar solution of basic aluminum chloride in an amount of 1 liter, fine-grained powder of aluminum alloy must be introduced in an amount of approximately 72 g for grade 2/3, and for grade 5/6 - 90 g.

The amount of isobutylbenzene liquid waste introduced depends on the density of the solution, which is determined by the AlCl ₃ content in g / dm ³ . A calculation was made and a table was compiled of the required input amount of liquid waste from the production of isobutylbenzene depending on its density for the preparation of grades 2/3 and 5/6 of one- and two-molar solutions of basic aluminum chloride in an amount of 1 liter.

In order to expand the raw material base for the production of highly refractory fibrous materials, sorbents and catalysts based on aluminum oxide from liquid waste from the production of isobutylbenzene with a density of 1.196 and 1.2104 g / dm ³ (AlCl ₃ content _of 221 and 243 g / dm ^3, respectively), the Al / Cl ratio = 0.37, acidity 1.5 pH, viscosity 6.152 cP, a laboratory sample of a solution of basic aluminum chloride with a content of 20.2% Al ₂ O ₃ , 7.1% Cl, acidity 3.5 pH, viscosity 7.413 cP was obtained, which Meets the requirements of TU 6-01-1-323-85.

 A sample of a laboratory batch of polycrystalline fiber was obtained from this sample, containing (per calcined substance) 34.4% alumina, 5.6% silica, weight change during calcination - 0.6%, linear shrinkage - 0.8%, average fiber diameter - 5.8 mm, which meets the requirements of TU 14-8-512-86.

Therefore, from the liquid waste of isobutylbenzene containing aluminum trichloride from 200 to 300 g / dm ³ , basic aluminum chlorides can be obtained, and from them polycrystalline aluminum oxide fiber, etc.

 In addition, samples of solutions of basic aluminum chloride were obtained for testing them as a coagulant for water purification.

Examples of the preparation of bimolar solutions of basic aluminum chloride by neutralizing the waste from the production of isobutylbenzene with fine powder of the aluminum alloy ASD-T are given in the table. The heating temperature is 80-90 ^o C, the cooking time is 1.5-2 hours. During heating, water evaporates. Therefore, water is introduced in approximately 1: 1 to the volume of the resulting solution of basic aluminum chloride grade 2/3 and in an amount of 2: 1 for grade 5/6.

You can get basic aluminum chloride also in dry form. The cooking process is the same, only the amount of water introduced is reduced by half. By heat treatment of the resulting solution of basic aluminum chloride at 80-90 ^o C receive basic aluminum chloride in dry form.

 Solutions of basic aluminum chloride and dry powder of basic aluminum chloride passed laboratory tests as a coagulant for the treatment of industrial wastewater and gave positive results.

 The advantages of the proposed method: cost reduction, simplification and acceleration of the process due to the transition to finished and cheap raw materials - waste production of isobutylbenzene, the use of finely dispersed aluminum alloy powder, product compliance with its formula due to the neutralization of components with their stoichiometric ratio, obtaining the product in dry form will facilitate its transportation.

Claims (5)

1. The method of producing basic aluminum chloride, including the neutralization of an aluminum trichloride solution with aluminum metal, characterized in that as a solution of aluminum trichloride use isobutylbenzene liquid waste with an aluminum trichloride content of 200-300 g / dm ³ .  2. The method according to claim 1, characterized in that finely dispersed aluminum alloy powder with a content of 99.1% aluminum and 0.9% titanium dioxide is used as metallic aluminum. 3. The method according to claim 1, characterized in that the neutralization is carried out at 80 - 90 ^o C for 1.5 to 2 hours with continuous stirring of the mixture.  4. The method according to claim 1, characterized in that the neutralization is carried out at a molar ratio of aluminum trichloride and aluminum (0.666 - 1.333): (1.333 - 2.666) and (0.333 - 0.666): (1.666 - 3.333) to obtain one- and two-molar solutions of basic aluminum chloride grade 2/3 and 5/6, respectively. 5. The method according to claim 1, characterized in that the basic aluminum chloride is subjected to heat treatment at 80 - 90 ^o C and receive the basic aluminum chloride in dry form.

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