Methods of scale inhibition using substoichiometric amounts of amino alcohol and phosphonic acids

Patent · Tue Jun 20 04:00:00 EDT 1972

OSTI ID:6024640

Kowalski, X

Most commercial water contains alkaline earth metal cations, such as calcium, barium, magnesium, and transition metals such as iron or copper, etc., and several anions such as bicarbonate, carbonate, sulfate, oxalate, phosphate, silicate, fluoride, hydroxises, etc. When combinations of these anions and cations are present in concentrations which exceed the solubility of their reaction products, precipitates form until their reaction solubility product concentrations are no longer exceeded. The precipitation of scale-forming materials in an aqueous system is inhibited by adding substoichiometric amounts of a precipitation inhibitor which consists of a mixture of an amino alcohol such as triethanolamine and certain phosphonic acids, such as amino tri(methylene phosphonic acid), to the system. (10 claims)

• Assignee: Monsanto Co.
• Patent Number(s): US 3671448
• OSTI ID: 6024640
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALCOHOLS
ALKALINE EARTH METALS
AMINES
ANIONS
BARIUM
CALCIUM
CATIONS
CHARGED PARTICLES
CONTROL
COPPER
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
IONS
IRON
MAGNESIUM
METALS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PETROLEUM
PHOSPHONIC ACIDS
PRECIPITATION
SCALE CONTROL
SEPARATION PROCESSES
SUBSTOICHIOMETRY
TRANSITION ELEMENTS
WATER TREATMENT
WELLS