This standard sets our the requirements for active alumina ball, test method, inspection rules, package, delivery and storage.
This standard applies to industrial active alumina. The industrial active alumina is used in the fields of oil refining, fertilizers, petrochemical, natural gas, oxygen regeneration and chemicals.It is mainly used as adsorbents of gas and liquid, fluorine absorbent, desiccant and catalyst support.
Molecular formula:Al2O3 . nH2O(n<1)
Classification
Industrial active alumina include six types
Adsorbent–general type, used for absorption and dehydration of various hydrocarbon gases, natural gas, petroleum cracking gas
Defluorination agent–used to defluorinate drinking water and industrial water.
regenerant–used to produce hydrogen peroxide by anthraquinone method
Antichlor agent–used for antichloration of various gases and clay resin
Catalyst support–used for various catastly support
Air desiccant–air separation specialized desiccant
Requirement
Appearance:white balls.
Industrial active alumina should meet Table1 requirement
Table 1 Requirement
| Item | Indicator | ||||||
| Absorbent | Defluorination agent | Regenerant | Antichlor agent | Catalyst support | Air desiccant | ||
| Al2O3/% | 90 | 90 | 92 | 90 | 93 | 88 | |
| Loss on ignition/% | 8 | 8 | 8 | 8 | 8 | 9 | |
| Tap density/ (g/cm3) | 0.65 | 0.70 | 0.65 | 0.60 | 0.50 | 0.60 | |
| Specific area/ (m2/g) | 280 | 280 | 200 | 300 | 200 | 300 | |
| Pore volume (cm3/g) | 0.35 | 0.35 | 0.40 | 0.35 | 0.40 | 0.35 | |
| Water absorption /% | – | – | 50 | – | 40 | – | |
| Wear rate/% | 0.5 | 0.5 | 0.4 | 0.5 | 1.0 | 0.5 | |
| Compressionstrength/ (N/pc) | Dia 0.5~2mm | 10 | |||||
| Dia 1~2.5mm | 35 | ||||||
| Dia 2~4mm | 50 | ||||||
| Dia 3~5mm | 100 | ||||||
| Dia 4~6mm | 130 | ||||||
| Dia 5~7mm | 150 | ||||||
| Dia 6~8mm | 200 | ||||||
| Dia 8~10mm | 250 | ||||||
| Partical rate/% | 90 | ||||||
Test method
(1)Appearance: we use visual discrimination ujder the condition of natural light
(2)Al3O2 content
Method summary
The Al ions are complexed with known excess ethylenediamine tetraacetic acid disodium standad solution(EDTA) to form a stable AL-EDTA complex. The excess EDTA was titrated back to the end point with a standard titration solution of zinc chloride using diocresol orange as indicator under PH=5 conditions.
Calculation
Calculation formula:
Loss of ignition
Test summary
The samples are burnt under 800℃ for a certain time.The different weight before and after burning is loss of ignition
Calculation
Calculation formula
Tap density
Method summary
The tap density is the rate of activate alumina mass and the corresponding volume
Calculate
Calculation method：
Specific area
Instrumental method
We need samples about 0.5g burnt 3 hours under (105±2)℃.The mass value accurate to 0.0002g. We put the samples into the degassing station for degassing treatment to ensure the vacuum of the samples meets the requirement of the instrument.After treatment, we need deliver samples to analysis station for test and we should finish test with 20 hours.
gravimetric analysis
Method summary
We use the mixture of ethanol and diethylene glycol to to do absorption under relative pressure P/P0 between 0.05～0.35. After absorption, we calculate the specific area using BET formula
Pore volume
method summary
According to the Kelvin formula, when tempture is confirmed, the adsorption material condenses into liquid in micro pores with different pore size if we change the relative pressure P/P0. The pore volume can be calculated by weighting the samples
calculation
Calculation formula
Static absorption capacity
Method summary
When the samples get adsorption equilibrium using water vapour as adsorbate under conditions of temperature 20℃～25℃, relative humidity 60%, the water vapour quantity adsorbed is the adsorption capacity
calculation
Wear rate
Method summary
A certain amount of samples are put into the grinding barrel and rotated according to the specified conditions. The samples are made friction and collision in the barrel.The percentage of the sample powered indicates the wear rate.
Calculation
Package, delivery and storage
Industrial active alumina should be packed with bags lined with polyethylene film.Out packing is normally plastic woven bags with 25kgs/bag. Or it can be packed as per requirement of customers.
During delivery, we should prevent it from rain, damp and package damage.
Industrial active alumina should be stored in a dry and ventilated warehouse.Also it should be put on the cushion to prevent moisture.
