CN1683247A - Process for producing anhydrous aluminium chloride - Google Patents
Process for producing anhydrous aluminium chloride Download PDFInfo
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- CN1683247A CN1683247A CN 200510024452 CN200510024452A CN1683247A CN 1683247 A CN1683247 A CN 1683247A CN 200510024452 CN200510024452 CN 200510024452 CN 200510024452 A CN200510024452 A CN 200510024452A CN 1683247 A CN1683247 A CN 1683247A
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- aluminum chloride
- isopropanol
- exchange column
- anhydrous aluminum
- ethanol
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Abstract
The present invention discloses a kind of simple anhydrous aluminum chloride producing process with low cost. The technological scheme includes filling crystalline aluminum chloride as material into exchange column, dewatering with alcohol or isopropanol and eliminating residual alcohol or isopropanol to obtain anhydrous aluminum chloride. The residual alcohol or isopropanol is eliminated through natural drying, centrifugal drying or stoving; and the dewatering is completed until the water content of the alcohol or isopropanol in the exchange column outlet is the same as that of the added alcohol or isopropanol. During the production, alcohol or isopropanol is recovered through rectification for reuse.
Description
Technical Field
The invention relates to a method for preparing inorganic salt, in particular to a method for preparing anhydrous aluminum chloride.
Background
Anhydrous aluminum chloride is widely used in organic synthesis catalysts, petroleum cracking catalysts, and the like, and is also widely used in synthesis of detergents, pesticides, dyes, perfumes, metal refining, and the like. The existing production process generally adopts a metallic aluminum method, a ferrite powder method and a hydrogen chloride method to produce anhydrous aluminum chloride. The chemical industry Press, published in 1 month of 1996, inorganic salt Industrial Manual, page 509-:(1) metal aluminum method: the specific method is that preheated aluminum ingots are put into a closed chlorination reaction furnace, chlorine is sent into the furnace from the upper part along a guide pipe, and the reaction is carried out at the temperature of 800-: and the generated aluminum chloride enters a condenser through a sublimation pipe, and is captured and precipitated to be crystallized, so that a finished product is obtained. The process has the defects that the tail gas is washed by alkaline water in a washing tower during emission, but certain waste water and waste gas are generated, and the production cost is high due to the use of metal aluminum. (2) Alundum … … fixed bed method: the process takes the aluminum oxide powder as the main raw materialCoal is used as a reducing agent, pulp waste liquid is used as an adhesive, chlorine is used as an oxidizing agent, and the reaction is carried out in the environment of 850-: . Cooling the furnace gas carrying a large amount of dust to obtain a crude AlCl product3. The tail gas contains a small amount of chlorine, and is treated by alkali liquor or sodium sulfite solution and then is discharged. (3) Alundum-fluidized bed method: putting aluminum oxide powder with the average particle size of 0.079mm and petroleum coke with the average particle size of 0.14mm into a roasting furnace according to a certain proportion, introducing air from the lower part, roasting at the temperature of 800 ℃, and exhausting flue gas after passing through a cyclone dust collector. Adding the solid-phase material captured by the separator into a chlorination furnace through an overflow pipe, and roasting the mixtureThe combined material naturally flows into the chlorination furnace through an overflow port. Chlorine and oxygen are introduced into the chlorination furnace, the temperature is 950 ℃, and the aluminum oxide powder reacts with chlorine in the presence of reducing agent carbon. And removing ash powder and chloride impurities carried in the gas by a pre-cooling separator and a pre-cooling tower. Cooling the purified gas to about 250 ℃, introducing four jacket water-cooled traps connected in series, cooling and crystallizing to obtain powder aluminum chloride, and discharging from the discharge port of the traps. The uncondensed gas is washed in three tail gas treating towers connected in series and then enters a turbulent ball tower for spraying sodium sulfite aqueous solution to remove unreacted chlorine in the tail gas and hydrogen chloride gas generated by hydrolysis of aluminum chloride. The residual gas is discharged, and the washing residual liquid is discharged into a sewer. The two methods have the defects of complex process, high manufacturing cost, waste water and waste gas generation and the like.
Disclosure of Invention
The invention aims to solve the problem of providing a method for preparing anhydrous aluminum chloride, which has simple process and low manufacturing cost.
In order to solve the problems, the invention adopts the following technical scheme: a process for preparing anhydrous aluminium chloride includes such steps as filling crystalline aluminium chloride in exchange column, introducing alcohol or isopropanol, dewatering, and removing residual alcohol or isopropanol.
The residual ethanol or isopropanol is removed by natural air drying or centrifugal drying and then drying.
The dehydration is complete, namely the water content of the ethanol or the isopropanol at the outlet of the exchange column is the same as the water content of the ethanol or the isopropanol added at the inlet of the exchange column.
The content of the ethanol is not less than 95 percent. The content of the isopropanol is not less than 88%.
The anhydrous aluminum chloride manufactured by the traditional process technology has the defects of complex process, high manufacturing cost and the like, and the crystalline aluminum chloride (AlCl)3.6H2O) is directly added, and anhydrous aluminum chloride cannot be directly obtained due to decomposition of hydrogen chloride. The anhydrous aluminum chloride is obtained by adding ethanol or isopropanol into the crystallized aluminum chloride for dehydration, and the ethanol or isopropanol obtained in the production process can be recovered by rectification and reused. Compared with the prior art, the method has the advantages of simple process, low manufacturing cost and the like.
Detailed Description
Example 1
Filling crystalline aluminum chloride into an ion exchange column, introducing 95% industrial ethanol into a liquid inlet of the ion exchange column, detecting the water content of liquid at an outlet of the ion exchange column, stopping introducing the ethanol when the water content of the liquid is the same as the water content of the added ethanol, taking out the solid in the ion exchange column after the liquid does not drip at the outlet of the ion exchange column, and obtaining the anhydrous aluminum chloride. In order to improve the purity of the anhydrous aluminum chloride, the anhydrous aluminum chloride can be dried after natural drying and centrifugal drying, or directly dried to remove residual ethanol.
Example 2
Filling crystalline aluminum chloride into an ion exchange column, introducing 96% industrial ethanol into a liquid inlet of the ion exchange column, detecting the water content of liquid at an outlet of the ion exchange column, stopping introducing the ethanol when the water content of the liquid is the same as the water content of the added ethanol, taking out the solid in the ion exchange column after the liquid does not drip at the outlet of the ion exchange column, and obtaining the anhydrous aluminum chloride. In order to improve the purity of the anhydrous aluminum chloride, the anhydrous aluminum chloride can be dried after natural drying and centrifugal drying, or directly dried to remove residual ethanol.
Example 3
Filling crystalline aluminum chloride into an ion exchange column, introducing 99.5% of industrial ethanol into a liquid inlet of the ion exchange column, detecting the water content of liquid at an outlet of the ion exchange column, stopping introducing the ethanol when the water content of the liquid is the same as that of the added ethanol, stopping introducing the ethanol, and taking out the solid in the ion exchange column after the liquid does not drip at the outlet of the ion exchange column to obtain the anhydrous aluminum chloride. In order to improve the purity of the anhydrous aluminum chloride, the anhydrous aluminum chloride can be dried after natural drying and centrifugal drying, or directly dried to remove residual ethanol.
Example 4
Filling crystalline aluminum chloride into an ion exchange column, introducing 98.5% of industrial isopropanol into a liquid inlet of the ion exchange column, detecting the water content of liquid at an outlet of the ion exchange column, stopping introducing the isopropanol when the water content of the liquid at the outlet of the ion exchange column is the same as the water content of the added isopropanol, and taking out the solid in the ion exchange column after the liquid at the outlet of the ion exchange column does not drip any more to obtain the anhydrous aluminum chloride. In order to improve the purity of the anhydrous aluminum chloride, the anhydrous aluminum chloride can be dried after natural drying and centrifugal drying, or directly dried to remove residual isopropanol.
Example 5
Filling crystalline aluminum chloride into an ion exchange column, introducing 99.5% of industrial isopropanol into a liquid inlet of the ion exchange column, detecting the water content of liquid at an outlet of the ion exchange column, stopping introducing the isopropanol when the water content of the liquid at the outlet of the ion exchange column is the same as the water content of the added isopropanol, and taking out the solid in the ion exchange column after the liquid at the outlet of the ion exchange column does not drip any more to obtain the anhydrous aluminum chloride. In order to improve the purity of the anhydrous aluminum chloride, the anhydrous aluminum chloride can be dried after natural drying and centrifugal drying, or directly dried to remove residual isopropanol.
Example 6
Filling crystalline aluminum chloride into an ion exchange column, introducing 88% of industrial isopropanol into a liquid inlet of the ion exchange column, detecting the water content of liquid at an outlet of the ion exchange column, stopping introducing the isopropanol when the water content of the liquid is the same as that of the added isopropanol, and taking out the solid in the ion exchange column after the liquid does not drip at the outlet of the ion exchange column to obtain the anhydrous aluminum chloride. In order to improve the purity of the anhydrous aluminum chloride, the anhydrous aluminum chloride can be dried after natural drying and centrifugal drying, or directly dried to remove residual isopropanol.
Claims (7)
1. The anhydrous aluminum chloride is prepared through filling crystalline aluminum chloride in exchange column, introducing alcohol or isopropanol into the liquid inlet of the exchange column to dewater the crystalline aluminum chloride, and eliminating residual alcohol or isopropanol after dewatering.
2. The method for preparing anhydrous aluminum chloride according to claim 1, wherein the removal of residual ethanol or isopropanol is performed by drying after natural drying, drying after centrifugal drying, or direct drying.
3. The method for producing anhydrous aluminum chloride according to claim 1 or 2, wherein the dehydration completion means that the water content of ethanol or isopropyl alcohol at the outlet of the exchange column is the same as the water content of ethanol or isopropyl alcohol introduced at the inlet of the exchange column.
4. The method for producing anhydrous aluminum chloride according to claim 1 or 2, wherein the content of ethanol is not less than 95%.
5. The method for producing anhydrous aluminum chloride according to claim 3, wherein the content of ethanol is not less than 95%.
6. The method for producing anhydrous aluminum chloride according to claim 1 or 2, characterized in that the content of isopropyl alcohol is not less than 88%.
7. The method for producing anhydrous aluminum chloride according to claim 3, wherein the content of isopropyl alcohol is not less than 88%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024452 CN1683247A (en) | 2005-03-14 | 2005-03-14 | Process for producing anhydrous aluminium chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510024452 CN1683247A (en) | 2005-03-14 | 2005-03-14 | Process for producing anhydrous aluminium chloride |
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| CN 200510024452 Pending CN1683247A (en) | 2005-03-14 | 2005-03-14 | Process for producing anhydrous aluminium chloride |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102849770A (en) * | 2012-10-15 | 2013-01-02 | 扬州大学 | Method for synthesizing anhydrous aluminum chloride by recycling aluminum chloride hexahydrate |
| CN103708518A (en) * | 2012-09-29 | 2014-04-09 | 贵阳铝镁设计研究院有限公司 | Anhydrous aluminum chloride preparation method |
| CN103803622A (en) * | 2012-11-06 | 2014-05-21 | 贵阳铝镁设计研究院有限公司 | Method using aluminum chloride hexahydrate dehydration to prepare anhydrous aluminum chloride |
-
2005
- 2005-03-14 CN CN 200510024452 patent/CN1683247A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103708518A (en) * | 2012-09-29 | 2014-04-09 | 贵阳铝镁设计研究院有限公司 | Anhydrous aluminum chloride preparation method |
| CN102849770A (en) * | 2012-10-15 | 2013-01-02 | 扬州大学 | Method for synthesizing anhydrous aluminum chloride by recycling aluminum chloride hexahydrate |
| CN102849770B (en) * | 2012-10-15 | 2015-06-17 | 扬州大学 | Method for synthesizing anhydrous aluminum chloride by recycling aluminum chloride hexahydrate |
| CN103803622A (en) * | 2012-11-06 | 2014-05-21 | 贵阳铝镁设计研究院有限公司 | Method using aluminum chloride hexahydrate dehydration to prepare anhydrous aluminum chloride |
| CN103803622B (en) * | 2012-11-06 | 2015-11-18 | 贵阳铝镁设计研究院有限公司 | A kind of by the method for Aluminum Chloride Hexahydrate Dehydration for Aluminum chloride anhydrous |
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