cap alpha. -1,4-thiazine alkanephosphonic acids as corrosion inhibitors

Patent · Tue Jan 19 04:00:00 EST 1982

OSTI ID:6376919

Quinlan, P M

..cap alpha..-1,4-thiazine alkanephosphonic acids are described as corrosion inhibitors. An ..cap alpha..-aminoalkanephosphonic acid is reacted with an equal molar amount of a divinyl sulfur compound to produce the thiazine alkanephosphonic acids. It is preferred to carry out the reaction in a solvent or a mixture of solvents in which the ..cap alpha..-amino phosphonic acid is soluble. To the solution of the ..cap alpha..-amino phosphonic acid, the divinyl sulfone is slowly added. The preferred temperature is 20 to 50 C. A catalyst, such as triethylamine, may be used. Upon cooling, the product precipitates and is purified by recrystallization. In some cases, it is necessary to reduce the final volume in order to isolate the desired product. These products may be used as scale inhibitors, chelating agents or microbiocides. 8 claims.

• Assignee: Petrolite Corp.
• Patent Number(s): US 4311663
• OSTI ID: 6376919
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150903* -- Geothermal Engineering-- Corrosion
Scaling & Materials Development
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
CATALYSTS
CHELATING AGENTS
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CONTROL
CORROSION INHIBITORS
GERMICIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOSPHONIC ACIDS
RECRYSTALLIZATION
SCALE CONTROL
SULFONES
SYNTHESIS