Scale inhibiting
Scale-forming compounds can be prevented from precipitating by inactivating their cations with chelating or sequestering agents, so that the solubility of their reaction products is not exceeded. Generally, this approach requires many times as much chelating or sequestering agent as cation present, and the use of large amounts of treating agent is seldom desirable or economical. Compounds containing a number of methylene phosphonated amine groups, having at least 3 nitrogens connected by ethylene groups, inhibit the formation of scale, such as calcium, barium and magnesium carbonate, silicate and sulfate scales, from aqueous solutions, even at relatively high temperatures, at threshold inhibitor concentrations. (10 claims)
- Assignee:
- Calgon Corp.
- Patent Number(s):
- US 3434969
- OSTI ID:
- 5625568
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
ALKENES
AMINES
AQUEOUS SOLUTIONS
BARIUM CARBONATES
BARIUM COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONATES
CHELATING AGENTS
CONTROL
CORROSION INHIBITORS
DISPERSIONS
ESTERS
GYPSUM
HIGH TEMPERATURE
HYDROCARBONS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
MIXTURES
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHONIC ACID ESTERS
QUANTITY RATIO
SCALE CONTROL
SCALING
SILICATES
SILICON COMPOUNDS
SOLUTIONS
SULFATE MINTERALS
SULFATES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
WATER TREATMENT
WELLS