• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A process for the preparation of pure aluminum chloride hexa hydrate is disclosed, in which the crystallisate mixture from the mother solution (centrifugate) and starting solution (wash solution) is treated first to the coldest of a number of crystallization steps, pumped to the hottest step by retrograde feeding, and in which only from the hottest step is a portion of the mother solution now rich in impurities removed.
    公开号:SU1017676A1
    申请号:SU797770665
    申请日:1979-07-05
    公开日:1983-05-15
    发明作者:Цигенбалг Зигфрид；Фишер Герхард；Штелцел Вольвганг
    申请人:Феб Мансфелдский Комбинат "Вильхелм Пик" (Инопредприятие)；
    IPC主号:
    专利说明:

    J
    but
    05 The invention relates to a process for the preparation of aluminum chloride hexahydrate in the form of crystallisate, the thermal decomposition of which produces alumina sufficiently pure for the production of aluminum. A known method for producing sufficiently pure aluminum chloride hexahydrate (AKM bNO) as a crystalline lysate by repeated crystallization. According to a known method, the contaminated crystallisate obtained by evaporating the initial solution is again dissolved in water and a more pure product is produced by repeated evaporation. The dissolution of the crystallization and the evaporation of the solution are repeated as many times as is required to obtain sufficient crystalline crystallisate. Repeated crystallization on the one hand allows obtaining high-purity aluminum salt, on the other hand, evaporation of large amounts of water requires a large amount of equipment, increases energy consumption and increases the cost of the process. It is known that the evaporated amount of water is much lower if a multi-stage fractionated crystallization process is used to obtain aluminum chloride hexahydrate. By a known method, as a result of incomplete evaporation, at the first stage of the process, sufficiently pure crystallized material is obtained. The residual solvent enriched with impurities is loaded onto the second stage of the process. We get at this stage crystallized reduced. This purity is returned to the first stage of the process, and the more contaminated residual solution is transferred to the third stage of the crystallization process, where it is further evaporated. The crystallized low frequency frequencies are returned to the second crystallization stage, and the heavily contaminated residual solution is discarded. According to a known method, the re-dissolution of crystallized material disappears, but it is necessary to have three complete crystallization units including an evaporator, a heat exchanger and a centrifuge. This includes two more machines with a stirrer and heating to convert the second and third stages of crystallized material into pulp. Of these three crystallization plants, sufficiently pure crystallized salt is produced only at the first stage. The remaining two stages serve only to concentrate the impurities in the ejected solution of the smallest possible amount. It is also known that sufficiently pure aluminum chloride hexahydrate (AlClg-SHnO) in the form of crystallisate can be obtained by coarse-grained crystallization by the method of fluidization and washing with concentrated hydrochloric acid in a centrifuge. Coarse Grain: The crystallization of aluminum chloride-crystallisate hexahydrate is complicated by the presence of a narrow metastable region and a high nucleation rate. In addition, the final rate of precipitation of crystals in a solution is very small due to the high viscosity of the solution and the small difference in density between the crystals and the solution. During crystallization in the fluidized bed, this leads to a small flow rate of the supersaturated solution in the fluidized bed of crystals, to obtain small amounts of crystals per 1 m of the supersaturated solution, as well as to a low specific crystallization productivity. Another disadvantage of the known method is the need to regenerate concentrated hydrochloric acid from the contaminated wash solution. There is also known a method of obtaining sufficiently pure aluminum chloride hydrate in the form of crystallized from contaminated solutions of aluminum chloride, which, by forced circulation of a suspension of crystals in the boiling zone of the crystallizer, creates a surface of crystals that is sufficient to reduce the supersaturation of the solution due to crystal growth. As a result, a free-flowing, coarse-grained crystallisate with a small residual moisture is obtained, which can be cleaned by washing with a little-contaminated stock solution in a centrifuge. Due to the fact that the solubility of aluminum chloride hexahydrate is practically independent of temperature with this method, oversaturation of the aluminum chloride solution is obtained by isothermal evaporation of the solvent. However, due to thermal engineering reasons (This requires a multi-stage crystallization process, in which heating in low-temperature steps is carried out mainly by evaporation, to obtain
    权利要求:
    Claims (2)
    [1]
    1. METHOD FOR PRODUCING ALUMINUM CHLORIDE HEXAHYDRATE in the form of a crystallizate from contaminated aluminum chloride solutions, by coarse-grained crystallization with forced circulation of a suspension of crystals and washing by centrifuge using an initial solution with a low content of impurities, which is different that the process is conducted in multi-stage crystallization plants, and the mixture obtained from centrifugation and washing from the mother liquor and the initial solution is fed to the stage of the crystallization process with the lowest temperature Ura, then with a countercurrent, is pumped to the stage with the highest temperature, from which the contaminated mother liquor is removed.
    [2]
    2. The method according to claim 1, wherein the pulp of crystals § is removed from each crystallizer separately. TO
    1 101
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    同族专利:
    公开号 | 公开日
    DE2919689C2|1988-02-25|
    DD137575B1|1980-12-24|
    HU181906B|1983-11-28|
    DD137575A1|1979-09-12|
    DE2919689A1|1980-02-14|
    CS220559B1|1983-04-29|
    US4264332A|1981-04-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EA018604B1|2011-05-31|2013-09-30|Елена Арсеньевна Петрова|Method for producing chloro-containing aluminium salts and process line therefor|US3285025A|1963-12-20|1966-11-15|Phillips Petroleum Co|Multi-stage crystallization process|
    US3406010A|1965-09-08|1968-10-15|Anaconda Co|Recovery of pure crystals of aici3.6h2o and production of aluminum oxide product therefrom|
    US3446578A|1966-10-26|1969-05-27|Anaconda Co|Purification of aluminum chloride|
    DD147185A3|1978-04-24|1981-03-25|Siegfried Ziegenbalg|METHOD FOR PRODUCING PURE ALUMINUM OXIDE|FR2518986B1|1981-12-30|1985-09-06|Criceram|PROCESS FOR THE PREPARATION OF HIGH-PURITY ALUMINS FROM IMPURE SOLUTIONS OF ALUMINUM CHLORIDE|
    FR2785289B1|1998-10-16|2007-01-05|Pierre Charles Jorgensen|DEEP CONVERSION TWINNING THE DEMETALLIZATION AND CONVERSION OF RAW, RESIDUES OR OILS USING PURE OR IMPRESSIVE OXYGEN COMPOUNDS |
    ID29093A|1998-10-16|2001-07-26|Lanisco Holdings Ltd|DEEP CONVERSION THAT COMBINES DEMETALIZATION AND CONVERSION OF CRUDE OIL, RESIDUES OR HEAVY OILS BECOME LIGHTWEIGHT LIQUID WITH COMPOUNDS OF OXYGENATE PURE OR PURE|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DD20703078A|DD137575B1|1978-07-31|1978-07-31|PROCESS FOR PREPARING PURE ALUMINUM CHLORIDE HEXAHYDRATE|
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