Why Dynamic Adsorbents (DAI) Over Other Companies?
Alumina has proven to be
the most effective sorbent available for adsorption chromatography.
The DAI team wrote the
book when it comes to alumina. Literally, not figuratively. For over 30
years innovations by the DAI team have played a major role in the
exponential growth of the use of alumina for separation technologies.
Dynamic Adsorbents is
the only company offering a comprehensive range of high quality alumina
and silica gel products that
are superior to anything in the marketplace and can handle a much wider
range of applications.
DAI Advantages
- 30 years of experience in the
industry
- Innovators in the use of alumina, playing a major role in how alumina
has and is being used.
- Offers widest range of silica gel and alumina in the industry
- Highest levels of quality control in the industry
- Maintains high inventory of silica and alumina allowing 24 hour
shipping in most instances.
- Because transactions are in US dollars, DAI can offer competitive
pricing for global demand
- Customized product for the unique application of the consumer
- Aggressive pricing.
DAI Alumina
Advantages
- DAI is an innovator in the use of
alumina: The DAI team wrote the book when it comes to alumina.
Literally, not figuratively. For over 30 years innovations by the
DAI team have played a major role in the exponential growth of the
use of alumina for separation technologies.
- DAI is the only company that can
customize alumina for a specific application
- Superior quality: DAI’s alumina is
superior quality to anything in the marketplace.
- Greater capacity and effectiveness
- Offers widest range and more types
of alumina products: Dynamic Adsorbents is the only company offering
a full range of alumina products that can handle a much wider range
of applications. DAI offers the largest number of pore sizes and
more quantity options than anyone in the industry.
- Widest range of applications:
DAI’s alumina can be used for pharmaceutical, industrial, biohazard,
bioterrorism, research, toxic waste, environmental cleanup, gas and
liquid dehydration applications. They can be used to remove: PCBs,
insecticides, radioactive contamination, lead, toxic waste, heavy
metals, colors or dyes, and chemical pyrogens
- Unique but trend setting in
establishing the manufacturing criteria in alumina grading
- Controls the full manufacturing
process
Unique DrysphereTM Product: Optimizes dessicant performance and dehydrates gas or liquid in a way that no
other product can offer.
DAI Silica Gel
Advantages
- Highest Quality: Highest quality
silica gel in the industry
- Detailed product quality analysis:
When it comes to silica gel, only vendor in the industry performing
a detailed analysis on each lot of silica gel provided to the
customer.
What Are the Advantages of Alumina over Silica Gel?
Dynamic Adsorbents is the industry
leader in the use of alumina for adsorption chromatography. While also
selling a comprehensive line of silica gel products that are the highest
quality in the industry and unique in providing customers with a
detailed analysis from each lot of silica gel provided the customer, we
recommend the use of since according to "August 2003 New Horizons and
Challenges in Fundamental Analysis and Monitoring" (see bottom of page),
Alumina is the most effective adsorbent used for this purpose.
Silica, along with 3 metal oxides
(alumina, titanium and zirconia), are all used in the stationary phase
of adsorption chromatography.
Attributes of silica include the
following:
- High sample loading
- Fewer unwanted reactions during
separation
- Wide range of chromatographic
forms of silica – wide range of surface areas and average pore
diameters
- The hydroxyl group in silica is
attached to silicon – hydroxyl groups are either free or hydrogen
bonded
- The silicas used are amorphous –
terms gels
While silica has a higher sample load,
there are several limitations in the use of silica:
- The silica backbone Si – 0 – Si
hydrolyzes at pH . 8
- Silica hydrolyzes at temperatures
greater than 40 degrees C
- Silica hydrolyzes in the presence
of phosphate and carbonate ions
- Silica is soluble in
aqueous/organic media in even slightly alkaline media at even
moderately elevated temperatures
- The siiloxane bond is unstable at
pH < 4.5 and becomes even more unstable the lower the pH
The Alumina advantage
Alumina has several advantages over
silica gel and the other metal oxides.
Chromatographic alumina is gamma
alumina with 2 specific adsorption sites: acidic, basic, and electron
acceptor sites. The adsorption sites are exposed aluminum atoms,
strained Ai-O bonds or cationic sites. They are in a crystalline form –
either alpha, gamma states or in an amorphous state, has a pH stability
ranging from pH 3 to pH 13, with great stability across the entire pH
range higher thermal stability than silica.
Alumina advantages include the
following.
- Due to its low pHpzc, silica
allows only for a cation exchange while metal oxides such as alumina
behave as amphoroteric ion exchangers: they can be cation or anion
exchanges depending on pH. Of all the metal oxides, alumina performs
the best in this role as an amphoroteric ion exchanger.
- Alumina has Lewis acid sites that
are responsible for ligand exchange ability
- Alumina offers much higher values
of pHpzc: i.e. at neutral pH the surface of alumina does not have a
negative charge and this will not interact with charged bases via
electrostatic interactions
- There is a strong affinity of
alumina for phosphates and carboxylates
- Alumina has a strong affinity for
halides – for example, it is able to elute excess concentrations of
fluoride from drinking water, leading to enhanced column packing
stability.
For more information, download the
following article from Center of Excellence Environmental
Analysis and Monitoring, August 2003 New Horizons and Challenges in
Fundamental Analysis and Monitoring.
Alumina Offers Several Advantages Over Other PCB Removal
Methods
Dynamic Adsorbents Inc. (DAI) has formulated
a specialty proprietary adsorbent (Alumina C) allowing PCBs to
be removed safely from contaminated sites. Alumina C is a
chemically and physically modified form of alumina with highly
favorable properties for the collection and isolation of PCBs.
Using industrial size batch chromatography, PCB contaminated
soil and other environmental waste is passed through columns
packed with Alumina C. PCBs are separated out through the
adsorption process which occurs when PCBs come into contact with
Alumina C. The captured PCBs remain in the column attached to
the alumina. This bonded material then contains virtually all of
the PCB material and the alumina bonded adsorbent may be
disposed of using appropriate destruction technology. The use of
this potent adsorbent serves as an efficient means to gather
PCBs in one location, subsequently aiding destruction
technologies which may subsequently be used to dechlorinate
these hazardous aromatic compounds.
Using Alumina C for PCB removal had been
demonstrated to be advantageous. Batch chromatographic
purification systems are transportable and are taken directly to
the contaminated sites in need of clean-up. Using this technique
there is no need to build a physical plant eliminating high
operating costs. Energy requirements are low, with no high
pressure or high temperatures being utilized. PCBs collected
(eluted) and bound to Alumina C are gathered in one location and
then safely carried to their final disposal site. While
chromatography uses batch processing rather than continuous
in-line processing this technique is proving to provide superior
separation capabilities.
