SU24313A1 - The method of obtaining anhydrous aluminum chloride - Google Patents

Description

The present invention relates to methods for producing anhydrous aluminum chloride from materials containing alumina and silica, by the action of chlorine in the presence of reducing agents, such as coal or carbon monoxide.

It is known that when chlorine is applied to raw materials, which simultaneously contain alumina and silica, such as clay, kaolin, bauxite, etc., in the presence of a reducing agent, not only alumina, but also silica is simultaneously converted into chloride, i.e. e. get along with aluminum chloride and silicon tetrachloride. If, however, there is no use of precipitating four-porous silicon, its formation, often almost reaching the same amount as alumina chloride, is only a loss of chlorine.

In order to reduce the formation of silicon chloride, the inventor, when chlorinating materials containing alumina and silica, silicon chloride, as it turned out that the latter plays a leading role in; known equation:

2А12Оз + 3SiCl4 SSiOa + 4 AidsSilicon chloride with respect to alumina at temperatures above 500 ° C acts as a chlorinating agent, i.e. favors the formation of aluminum chloride and even when alumina is bound to silica. Under these conditions, chlorine does not act on silica. Silicon chloride, the boiling point of which is 56 °, has an ordinary temperature already high vapor pressure and, therefore, it is enough to conduct chlorine through silicon chloride to load it. Depending on the amount of silica chloride added to the grain, or the same amount of silicon chloride (SiCU) that was added to the chlorine (the technically correct amount of SiCU), it will again precipitate after the separation of aluminum chloride, or a part of the SiCh with alumina will turn into aluminum chloride ( too much SiCl4), or part of SiCU is formed again (too little SiCU).

Example 1 (without the addition of SiCU) .- 100 kg of the mixture, molded and coked, for example, according to D.R.P. No. 450979 of brown coal clay, containing about 30 ° / o AlaOa, 55 ° / o SiOa and carbon, is treated with 102 "g of chlorine at approximately 700 - 800 °. 71 kg of Aids and 54 kg of SiCU are formed and the remainder remains at 36 "g.

Example 2. -100 "g of the starting material of example 1 is treated at 760 ° with approximately 57" g of chlorine, to which about 60 kg of SiCl4 is added. About 71 kg of AlClg (chloride: aluminum) is obtained and about 60 kg is condensed. A residue of 65 kg remains. Since again exactly the same SiCU was condensed. how much was added to chlorine, it turns out that only aluminum chloride could re-form, as is confirmed by the weight of the residue.

Example 3.-100 "g of the starting material of example 1 is treated at approximately 750 ° with 45 kg of chlorine, to which 75 kg of SiCU have been added. Forms 70 kg A1Cl3 and condenses.

about 61.5 kg of SiCl. A residue of about 70.5 kg is obtained. Thus, 13.5 к «SiCU with АООз turned into AICU, i.e. a little more than 20 / o silicon chloride by the above equation acted instead of chlorine on alumina. It follows that the admixture of excess SiCli to chlorine in the particular case does not harm, since the excess is used to promote the formation of aluminum chloride.

The subject of the patent.

1. A method of producing anhydrous aluminum chloride from materials containing alumina and silica, by the action of chlorine in the presence of reducing substances, such as coal or carbon monoxide, characterized in that, in order to reduce -; the formation of silicon chloride; fumes of silicon chloride are added to the chlorine.

2. Acceptance of the method mentioned in claim 1, characterized in that approximately equal amounts of silicon chloride vapors are mixed in with chlorine.

3. Acceptance of the aforesaid in paragraphs. 1 and 2, characterized in that the silicon chloride, after separating the aluminum chloride, is again mixed with the chlorine to process the new portions of the material.