Activated alumina is manufactured from aluminium hydroxide by dehydroxylating it in a way that produces a highly porous material,this material can have a surface area significantly over 200 m²/g. The compound is used as a desiccant (to keep things dry by absorbing water from the air) and as a filter of fluoride, arsenic and selenium in drinking water,also it can be used as SRU catalyst or catalyst support material.
Activated alumina is made of aluminium oxide (alumina; Al2O3) which is a high-surface-area, highly porous form of aluminum oxide. It can adsorb gases and liquids without changing its form. It works as a desiccant through adsorption. As air passes through the alumina, the water in the air sticks it and becomes trapped and air that passes through an activated alumina filter is dried out.Even if immersed in a liquid,activated alumina will not fall apart or soften.
You can restore the original adsorption efficiency of activated alumina by heating it to any temperature from 350° to 600°F (177° to 316°C). When the desiccant is heated as described above, the water stored in it is released. This means that filters with AA can be reused over and over again.
SINOCATA produces a variety of standard and customized activated aluminas for adsorption and catalytic applications in oil refining, petrochemical, gas processing and related industries.
Applications
The desiccants are the materials which are widely used to absorb the moisture, humidity, water vapors and odor, which have the ability to maintain the effectiveness and originality of the products. The main task of air drying desiccants is to dehydrating the air and removes the contaminants to get the pure air, such as to get dry and pure air for instruments. There are variety of desiccants can be used for drying, cleaning and purifying the air or gases. These include molecular sieve, silica gel, activated alumina and others. Among these, activated alumina balls are proved as the most effective desiccant to obtain the high performance results from many industrial applications. This desiccant is used for heated air drying, compressed air drying, van air drying and several other applications that require air drying process for obtaining the efficient end product.
SINOCATA AA Activated Alumina is a smooth and dust free sphere of activated alumina which is an excellent desiccant for drying a wide variety of liquids and gases. Nearly all gases and liquids can be dried with AA. Water removal is often necessary for efficient processing, storage and transportation of fluids. AA Activated Alumina is available in nominal sizes of 1/16″, 1/8″, 3/16″ and 1/4″ spheres.
SINOCATA PSR-1 Activated Alumina Claus Catalyst is a high surface area activated alumina sphere with tailored pore size distribution to enhance Claus reaction activity through increased diffusion rates and surface activity. The custom tailored pore structure includes optimum levels of micro, meso and macropores, thereby providing maximum access to active sites while minimizing sulfur deposition (condensation) during normal operations. PSR-1 is particularly well suited for use in sulfur recovery processes operated near or below the sulfur dew point. The third reactor of a Claus unit can be operated closer to the sulfur dew point to enhance sulfur recovery.
For information on Claus catalyst products, refer to product data sheet for: PSR-1, PSR-21 etc.
HF-1, HF-10 are smooth, spherical activated alumina which has proven to be useful in removing free HF and organic fluorides from HF alkylation product streams. Its excellent physical strength, low abrasion loss, and low silica content help extend the service life and minimize valve plugging.
This kind of activated alumina has a high macroporosity and high surface area. It ensures maximum capacity for removing both HF and organic fluorides from hydrocarbon streams. The HF-1, HF-10 activated alumina is used as a high-capacity scavenger for defluorination of butane, propane, and alkylate streams produced in the HF alkylation process.The alumina is converted to aluminum fluoride.
AA-G7 and AA-G8 peroxide grade activated alumina adsorbents offer exceptionally high surface area developed specifically to meet the specialized needs of hydrogen peroxide production. They are exceptionally high surface area aluminas developed specifically for service in hydrogen peroxide production.
Why AA-G7, AA-G8 for hydrogen peroxide production?
SINOCATA AA-G7 & AA-G8 aluminas provide excellent performance for both deep oxification and reversion of hydrogenated surface area and decreases quinone retention on the spent product.
How is Hydrogen Peroxide made?
The manufacturing process involves the catalysis of the reaction of H2 (obtained from processing Maui Gas) with atmospheric O2 to give H2O2. Anthraquinone (Q) is used as a H2 carrier. The major uses of peroxide utilize its strongly oxidizing nature to oxidize various chemical groups.
What is the role of alumina in the production of hydrogen peroxide?
During the hydrogenation step of hydrogen peroxide production, the working solution containing the dissolved anthraquinone is hydrogenated using hydrogen gas in a slurry-type hydrogenator using alumina loaded with a small amount of palladium catalyst. The anthraquinone working solution is heated in the presence of either activated alumina or activated magnesia, thereby regenerating its hydrogen peroxide synthesizing capacity.
Activated Alumina AA-G9, AA-G10 is specially developed for the purification for the polymer solution, it can adsorb the impurities such as the catalyst residue, TBC, hydrocarbon effectively which contribute to the high purity of the polymer products.
How it works?
Tert-Butylcatechol (TBC) is added to styrene and butadiene to inhibit polymerization during manufacturing, storage and shipping. TBC will react with dissolved oxygen to form quinones which acts as an inhibitor by reacting with chain free radicals thereby preventing propagation, and second the removal of dissolved oxygen prevents the formation of peroxides which are potentially dangerous polymerization initiators. TBC must be removed from the monomer stream before polymerization is initiated and water often must be removed due to the hygroscopic nature of some monomers. SINOCATA provides a specialty activated alumina to remove the TBC compound so that the styrene can meet specifications.
AA-G8 activated alumina for polyethylene purification is as a filtration media in polyethylene production.In this process, the slurry co-catalyst is filtered out of the polyethylene and trapped in the pores of the alumina bead.
Polyethylene (PE) is the most common plastic precursor and is used in a range of applications. Polyethylene is made from the building block of petroleum-based products, ethylene. Ethylene is produced from cracking ethane or naphtha. Often, an ethylene cracker is built on or near a refinery or PE derivative plants. In general terms, ethylene, a co-monomer, and solvent are purified and reacted with a catalyst in a continuous stirred tank reactor (CSTR). The slurry mixture exiting the reactor is then filtered to remove catalyst particles. Next, solvent is separated from the product with solvent recovery and recycle following. Purified polyethylene is extruded and then pelletized to a final product.Product created in a CSTR must be purified at the end of the process, removing the co-catalyst. The catalyst removal step is done through adsorption beds of AA-G8 activated alumina balls. This type of activated alumina is defined as HDPE purification.
Various size available for the international condition.
7* 14 mesh(1.2-2.8mm), 6*10mesh(1.5-3.2mm),5*8(2.5-4.0mm)
Characteristics of Activated alumina for polyethylene purification:
1.High bulk density
2.Uniform size
3.High mechanical strength and wear resistance
4.High pore volume and high adsorption
Modified activated alumina adsorbents are synthetically produced, transitional phase alumina. Unlike zeolites, activated aluminas are less crystalline and have a pore system that is not uniform. An activated alumina’s ability to act as an adsorbent is largely determined by the functionality of its surface, which can be modified during manufacturing. Without modification, activated alumina adsorbents rely on weak molecular forces for adsorption and, therefore, are inefficient at adsorbing polar contaminants at low concentrations. However, with modifications, an activated alumina’s chemisorption properties can be enhanced, thus transforming it into an efficient and effective adsorbent. In general, the addition of an inorganic compound to the activated alumina can cause it to act as a weak base.
SRU Active Bed Support is composed of uniform spheres of activated alumina produced by unique manufacturing process. They are available in 1/2inch (12.7mm), and 3/8 inch (9.5mm) diameter balls. All sizes have extremely high crush strength. Their primary use is for bed support at the top and bottom of Claus converters (reactors).The high crush strength, ball uniformity, and attrition resistance properties associated with SRU Active Bed Support spheres assures low pressure drop characteristics during normal converter operation. SRU Active Bed Support has about 1/3 the packed bulk density of ceramic bed support media.For information on Claus catalyst products, refer to the product data sheet publications for:PSR-1, PSR-21 etc.
Activated Alumina Catalyst Carriers are required to have excellent purity and adequate mechanical strength in order to facilitate proper impregnation of active ingredients. Additionally, a very high adsorptive capacity and high surface area make it suitable for NOx removal and other toxic vapors removal catalysts. Thus, it has substantial use in industrial pollution properties.High Purity Alumina Carriers in the form of rings, spheres and tablets are used in different catalyst manufacturing processes. Our group produces them suitable for all purposes based on requests.
We offer products in the form of spheres, extrudates, pellets and powders. We customize these products to meet customer’s specified targets—focusing on properties such as surface area, internal pore structure and distribution, loss on ignition (LOI), free moisture, particle size and strength.
Product ranges include:
Spherical product from 2mm (1/16th”) up to 13 mm (1/2”)
Fine particle and granular products from 2 micron up to 3 mm
Extrudate from 1 mm up to 8 mm