Process for producing modified aluminium oxide
A production method, alumina technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of expensive equipment, complicated process, low particle strength, etc., and achieve the effects of fast filtration speed, enhanced efficiency, and large specific surface area
Inactive Publication Date: 2008-10-22
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
The production of domestic activated alumina mostly adopts the production process of acid-base neutralization method, that is, adding an inorganic alkali precipitant to the refined alumina solution, and obtaining the product after precipitation, filtration, washing, drying, granulation, and activation. Adsorption and decolorization is η-Al 2 o 3 , r-Al 2 o 3 Two kinds, but when applied to the decolorization of producing cefazolin acid sodium, the effect is not ideal, the main reason is that the particle strength is low and the specific surface area is small
Germany's Schumacher prepared alumina crystal powder by flame hydrolysis, and Japan's Kajihara prepared r-alumina by calcining a mixture of aluminum salt and seed crystals. The process is complicated and the equipment is expensive
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[0016] Select aluminum hydroxide with crystalline form α or β (obtained by the sorting method), wash with water to remove impurities, and then quickly dry it with an airflow dryer until the moisture content is 5-7%, and then use 5% acetic acid to dry it. Soak in a mixed solution of 0.6% palladium chloride for 1 hour, wherein the weight ratio of palladium chloride addition to aluminum hydroxide is 3:100, then wash with water to remove unreacted acetic acid and palladium chloride, and air-dry at 180°C After drying, modified aluminum hydroxide is obtained. The modified aluminum hydroxide is activated in a rotary furnace at 650°C for 1 hour, and then cooled naturally in the air to obtain the modified aluminum oxide for drug decolorization. Check the crystal form and specific surface area of the product, and sieve after passing the test.
[0017] The water after pickling also contains a large amount of acetic acid and palladium chloride, which can be recycled, has no obvious imp...
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The present invention relates to a production method of modified aluminium oxide. Said production method includes the following steps: A, selecting and using aluminium hydroxide whose crystalline form is alpha or beta, water-washing to remove impurity, adopting pneumatic drier to quickly dry said aluminium hydroxide; B, soaking the aluminium hydroxide in mixed solution formed from 5% acetic acid and 0.6% palladium chloride; C, water-washing and removing unreacted acetic acid and palladium chloride and pneumatically drying at 180deg.C; and D, activating the above-mentioned obtained product in rotary furnace at 650 deg.C and cooling so as to the invented finished product.
Description
technical field [0001] The invention relates to a production method of modified alumina, which belongs to the technical field of chemical synthesis and refining. Background technique [0002] Aluminum oxide is an adsorbent, which has the advantages of good selectivity, large adsorption capacity, and convenient regeneration. It can be used for the purification of alkaloids, volatile oils, terpenes, saponins, oils and other Chinese herbal medicine components. At present, aluminum oxide is widely used in the decolorization process of enzymatic production of 7-ACA and chemical production of cefazolin acid sodium in the pharmaceutical industry. It is the last step in the synthesis of cefazolin acid sodium and is the product qualification. The essential. Its main component is r-Al 2 o 3 , which has a large specific surface area, can be used as an adsorbent and for decolorization of products. The production of domestic activated alumina mostly adopts the production process of a...
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IPC IPC(8): B01J20/08
Inventor 魏福祥任清亮王金梅
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY