Phosphate esters
AssigneeNalco Chemical Company
InventorsWun Ten Tai, Lawrence A. Mura, Kenneth G. Phillips, Edward G. Ballweber
Life of this patent
Estimating the term…
Abstract
Phosphate esters including polymers are produced by mixing polyols, such as glycerol, with phosphoric acid material followed by heating under reduced pressures in the presence of inorganic base to temperatures of from about 135.degree. to 165.degree. C. By maintaining reactants under subatmospheric conditions, water is removed as formed. The products have utility as scale suppressant additives to water used in heat exchange and cooling tower applications.
Claims5
An organophosphate composition comprising on a 100 weight percent total weight basis
- a. from about 5 to 70 weight percent water, and
- b. the balance up to 100 weight percent thereof being a phosphate ester composition,
- c. said phosphate ester composition comprising on a 100 weight percent total weight basis
- 1. from 0 to about 15 weight percent inorganic phosphate,
- 2.
A phosphate ester composition comprising on a 100 weight percent total weight basis
- A. from about 0 to 15 weight percent inorganic phosphate,
- B. the balance up to 100 weight percent of any given said composition being organophosphate material, and
- C. said organophosphate material containing on a 100 weight percent total organophosphate weight basis from about 20 to 60 weight percent of polymeric material, said composition having been produced by the process of simultaneously
- A. heating in a reaction zone at a temperature of from about 130.degree. to 175.degree. C at least one phosphoric acid material selected from the group consisting of phosphoric acid and polyphosphoric acid in admixture with at least one polyol which is characterized by
- 1. having from 2 to 7 carbon atoms per molecule,
- 2. having from 2 to 4 hydroxyl groups per molecule distributed so that not more than one oxygen atom is substituted on each carbon atom per molecule, and
- 3. being selected from the group consisting of hydroxyl substituted saturated aliphatic hydrocarbons, in the presence of a minor amount of at least one inorganic base selected from the group consisting of alkali metal hydroxides, alkaline earth metal hydroxides, and ammonia, the mole ratio of said polyol to said phosphoric acid material as charged to said zone ranging from about 0.5 to 1.5, and the mole ratio of said inorganic base to said phosphoric acid material being from 0.1 to 1.0,
- B. maintaining said reaction zone at a subatmospheric pressure, ranging from greater than 0 to about 400 mm Hg, and
- C. removing water from said zone at a rate at least about equal to the rate water generated in said reaction zone.
Dependencies are inferred from the claim text.