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US 4,921,589 AGranted
Polysiloxane bound photosensitizer for producing singlet oxygen
AssigneeAllied-Signal Inc.
InventorsStephen F. Yates, Mary L. Good, Inara M. Brubaker
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AssigneeAllied-Signal Inc.
InventorsStephen F. Yates, Mary L. Good, Inara M. Brubaker
Estimating the term…
This invention relates to a photosensitizer which is bound to a polysiloxane polymer, a method of preparing the bound photosensitizer and a process for using the bound photosensitizer. The photosensitizers which may be used in the invention include rose bengal, rhodamine B, acridine orange, methylene blue and zinc phthalocyanine. The photosensitizer is attached to the polysiloxane by reacting a hydroxyl or vinyl group on the photosensitizer with a hydrogen on the polyhydrosiloxane, thereby binding the photosensitizer into the polymer network. Finally, the bound photosensitizer may be used to oxidize undesirable oxidizable compounds present in a hydrocarbon or aqueous fraction. One specific example is the sweetening of kerosene which involves oxidizing the mercaptans contained in the kerosene.
A supported photosensitizer coating comprising a network of polysiloxanes crosslinked by a copolymer having bound to it a photosensitizier supported on a solid substrate, the polysiloxanes having the formula ##STR10## one or both ends of the polysiloxane covalently bound at the position designated X of a copolymer having the formula, ##STR11## or the formula ##STR12## where R, R.sub.1, R.sub.2 and R.sub.4 are individually an alkyl, aryl, alkaryl, or aralkyl group having from 1 to about 20 carbon atoms, n is an integer from 200 to about 2000, R.sub.3 is a photosensitizer and n' and n" are integers each having a value of at least one and the sum of n' and n" being an integer from about 20 to about 100.
A method of preparing a supported photosensitizer coating comprising
A method of oxidizing undesirable oxidizable compounds present in a hydrocarbon or aqueous fraction comprising contacting the hydrocarbon or aqueous fraction with a polysiloxane bound photosensitizer in the presence of molecular oxygen and light, thereby oxidizing the oxidizable compound by reacting the oxidizable compound with singlet oxygen which is generated from molecular oxygen by energy transfer from the light and the polysiloxane bound photosensitizer and producing a treated hydrocarbon or aqueous fraction.
Dependencies are inferred from the claim text.