ROMAX™ 7000 Anionic Flocculant
Typical Properties
These properties are typical but do not constitute specifications.
Appearance Milk-white liquid
Chemical nature Acrylic polymer emulsion
Total solids (%) 18
pH as is (at 25°C) 2.9
Density (at 25°C) 1.04
Brookfield Viscosity (mPa.s/cps at 25°C) 40
Chemistry and Mode of Action
ROMAX 7000 is a high molecular weight, slightly crosslinked, acrylic polymer emulsion containing acid functional
groups. Neutralization with bases converts ROMAX 7000 to viscous solutions of highly swollen polyelectrolytes
useful for flocculating suspended oil particles in oilfield treatment aqueous media. Salts of ROMAX 7000 increase
the settling rate of suspended solids and condition the particles for separation by filtration, centrifugation,
sedimentation or flotation.
ROMAX 7000 is used conveniently, because its low viscosity eliminates the handling difficulties often associated
with solutions of high molecular weight polyelectrolyte. To prepare ROMAX 7000 for use, a solution (10% solids
content) of a base is added to the diluted emulsion (2% solids content) immediately before treating the
suspension.
Features and Benefits
ROMAX 7000 offers:
Improved emulsion stability
Less tendency to gel over a wide range of temperatures
Excellent tolerance to ethylene glycol
Ease in formulating
Improved formulation stability
Applications
ROMAX 7000 is a very effective flocculating agent and can further increase the floc size of previously flocculated
suspensions. A greater floc promotes faster settling and improves the filtration rate.
Suspended materials may carry a positive electric charge and, therefore, will not interact with inorganic flocculants
such as alum, ferric chloride, or with cationic polyelectrolytes. These agents, therefore, cannot produce flocculation
of the systems. Examples of such difficult substances are certain suspended organic or inorganic materials from
industrial processes, produced and injected waters in oilfields, and commercial or industrial waste streams. Such
systems can often be treated successfully with ROMAX 7000 anionic polyelectrolyte.
Other suspensions are best handled by adding ROMAX 7000 and a cationic flocculant. In all cases, jar test should
be run to establish the most suitable agents and the optimum dosage levels.
Method of Use
The exact method of use is dependent on the unique challenges presented by the specific application. ROMAX
7000 can be diluted as the emulsion and then added directly to alkaline systems to begin flocculation. For lower
pH systems, this product may provide optimal performance if first prepared as 1% water soluble salt solutions.
Preparation of Salt Solutions
The table below lists the amount of emulsion, hydroxide and water needed to prepare 1% solutions of the sodium,
potassium or ammonium salts of ROMAX 7000. Add the ingredients in the listed order and agitate until mixing is
complete.
Preparation of Salt Solutions
(1% solids content)
Ingredient Sodium Salt Potassium Salt Ammonium Salt
ROMAX 7000 9.4 8.6 9.8
Water 85.1 84.5 87.8
Hydroxide 5.5 6.9 2.4
(10% solution)
Water 100.0 100.0 100.0
Total 200.0 200.0 200.0
Stability
Freeze Thaw
Samples of the emulsion product were stored at -3°C and -18°C for 16 hours (samples froze solid). After four
freeze-thaw cycles, ROMAX 7000 flocculant exhibited very good stability. No coagulum or gelling occurred.
Thermal Stability
Samples of the emulsion product were stored at 50°C and 60°C. After one week at 50°C, ROMAX 7000 flocculant
exhibited good stability. However, the product totally gelled between 1-2 days at 60°C.
Formulation and Thermal Stability
ROMAX 7000 was added to different concentrations of ethylene glycol or methanol and placed in a 50°C oven for
one week.
Ethylene glycol
As the level of ethylene glycol increases from 30 to 50%, the amount of polymer that can be used in the
formulation decreases. Limits are:
- In 30% ethylene glycol: 30% ROMAX 7000 max.
- In 40% ethylene glycol: 25% ROMAX 7000 max.
- In 45% ethylene glycol: 20% ROMAX 7000 max.
- In 50% ethylene glycol: 20% ROMAX 7000 max.
Methanol
As the level of methanol increases from 30 to 50%, the amount of flocculant that can be added decreases
only slightly compared to the much larger decrease observed in the ethylene glycol formulation. However,
the level of polymer that can be added is lower in methanol than in ethylene glycol. Limits are:
- In 30% methanol: 15% ROMAX 7000 max.
- In 40% methanol: 15% ROMAX 7000 max.
- In 50% methanol: 12% ROMAX 7000 max.
Material Safety Data Sheets
Rohm and Haas Company maintains Material Safety Data Sheets (MSDS) on all of its products. These contain
important information that you may need to protect your employees and customers against any known health and
safety hazards associated with our products.
We recommend that you obtain copies of MSDS for our products from your local Rohm and Haas technical
representative or the Rohm and Haas Company. In addition, we recommend that you obtain copies of MSDS from
your suppliers of other raw materials used with our products.
ROMAX is a trademark of Rohm and Haas Company or of its subsidiaries or affiliates.
These suggestions and data are based on information we believe to be reliable. They are offered in good faith, but without guarantee, as
conditions and methods of use of our products are beyond our control. We recommend that the prospective user determines the suitability of
our materials and suggestions before adopting them on a commercial scale.
Suggestions for uses of our products or the inclusion of descriptive material from patents and the citation of specific patents in this
publication should not be understood as recommending the use of our products in violation of any patent or as permission or license to use
any patents of the Rohm and Haas Company.
©Rohm and Haas, 2008. All rights reserved. September 2002
ROMAX 7000.PDS.E.ER.09/2002.
