US4444649A — Antifoulant for high temperature hydrocarbon proc…

Claim 1

Independent Claim 51 words

A substantially anhydrous hydrocarbon oil composition comprising a substantially anhydrous hydrocarbon oil having dissolved therein at least one tri-substituted phosphate in a concentration of about 5 ppmw to about 500 ppmw, said composition having a reduced tendency for fouling at elevated temperatures as compared to that of said anhydrous hydrocarbon oil.

Claim 2

Dependent Claim 51 words

A substantially anhydrous hydrocarbon oil composition comprising a substantially anhydrous hydrocarbon oil having dissolved therein at least one tri-substituted phosphate in a concentration of about 5 ppmw to about 500 ppmw, said composition having a reduced tendency for fouling at elevated temperatures as compared to that of said anhydrous hydrocarbon oil.

Claim 3

Dependent Claim 40 words

The composition defined in claim 1 wherein said tri-substituted phosphate is characterized by the formula: ##STR4## where R 1 , R 2 and R 3 are selected from the group consisting of alkyl, aryl, alkaryl, cyloalkyl, alkenyl, and aralkyl radical.

Claim 4

Dependent Claim 24 words

The composition defined in claim 1 having better heat transfer characteristics at the incipient fouling temperature than said hydrocarbon oil without said tri-substituted phosphate.

Claim 5

Dependent Claim 13 words

The composition defined in claim 1 wherein said tri-substituted phosphate comprises tridecyl phosphate.

Claim 6

Dependent Claim 26 words

The composition defined in claim 1 wherein said hydrocarbon oil is one in which at least 50 percent boils at a temperature above about 500° F.

Claim 7

Dependent Claim 17 words

The composition defined in claim 1 further comprising at least one oil-soluble derivative of a hydrazine compound.

Claim 8

Dependent Claim 29 words

A substantially anhydrous hydrocarbon oil composition having a reduced tendency for fouling at elevated temperatures comprising a substantially anhydrous heavy hydrocarbon oil having dissolved therein a tridecyl phosphate compound.

Claim 9

Dependent Claim 29 words

A substantially anhydrous hydrocarbon oil composition having a reduced tendency for fouling at elevated temperatures comprising a substantially anhydrous heavy hydrocarbon oil having dissolved therein a tridecyl phosphate compound.

Claim 10

Dependent Claim 20 words

The composition defined in claim 7 containing tridecyl phosphate in a proportion between about 5 ppmw and about 500 ppmw.

Claim 11

Dependent Claim 26 words

The composition defined in claim 7 having better heat transfer characteristics at the incipient fouling temperature than said heavy hydrocarbon oil without said tridecyl phosphate compound.

Claim 12

Dependent Claim 27 words

The composition defined in claim 7 wherein said heavy hydrocarbon oil is one in which at least 50 percent boils at a temperature above about 850° F.

Claim 13

Dependent Claim 49 words

The composition defined in claim 7 further comprising at least one oil-soluble derivative of a hydrazine compound selected from the group consisting of a phenyl hydrazine, totutriazole, monomethyl hydrazine, propoxylated pyrazole, ethoxylated dimethyl pyrazole, di(2-hydroxypropyl)-di(2-hydroxypropoxypropyl) hydrazine, tetra-(hydoxypropoxypropoxypropyl) hydrazine, ethoxylated dimethyl pyroyole, propoxylated dimethyl pyroyole, and tetra-(propoxypropoxypropoxy propoxyl hydroxypropyl) hydrazine.

Claim 14

Independent Claim 100 words

A method for reducing fouling of heated surfaces contacted with a hydrocarbon oil during refinery processing thereof, said method comprising the step of contacting a substantially anhydrous hydrocarbon oil with said heated surfaces during said refinery processing, said substantially anhydrous hydrocarbon oil containing a foulant-inhibiting amount in a concentration of about 5 ppmw to about 500 ppmw, of an additive comprising at least one tri-substituted phosphate, said tri-substituted phosphate being characterized by the formula: ##STR5## where R 1 , R 2 and R 3 are selected from the group consisting of an alkyl, aryl, alkaryl, cyloalkyl, alkenyl, and aralkyl radical.

Claim 15

Independent Claim 100 words

A method for reducing fouling of heated surfaces contacted with a hydrocarbon oil during refinery processing thereof, said method comprising the step of contacting a substantially anhydrous hydrocarbon oil with said heated surfaces during said refinery processing, said substantially anhydrous hydrocarbon oil containing a foulant-inhibiting amount in a concentration of about 5 ppmw to about 500 ppmw, of an additive comprising at least one tri-substituted phosphate, said tri-substituted phosphate being characterized by the formula: ##STR5## where R 1 , R 2 and R 3 are selected from the group consisting of an alkyl, aryl, alkaryl, cyloalkyl, alkenyl, and aralkyl radical.

Claim 16

Dependent Claim 14 words

The method defined in claim 12 wherein said additive comprises an oil-soluble tri-substituted phosphate.

Claim 17

Dependent Claim 33 words

The method defined in claim 12 wherein the resultant hydrocarbon oil containing said tri-substituted phosphate has better heat transfer characteristics at the incipient fouling temperature than said hydrocarbon oil without said tri-substituted phosphate.

Claim 18

Dependent Claim 12 words

The method defined in claim 12 wherein said additive comprises tridecyl phosphate.

Claim 19

Dependent Claim 26 words

The method defined in claim 12 wherein said hydrocarbon oil is one in which at least 50 percent boils at a temperature above about 500° F.

Claim 20

Dependent Claim 25 words

The method defined in claim 12 wherein said additive comprises a mixture of said tri-substituted phosphate and one or more oil-soluble derivatives of hydrazine compounds.

Claim 21

Independent Claim 57 words

A method for reducing fouling of surfaces contacted with a heavy hydrocarbon oil during refinery processing thereof, said method comprising the step of contacting a substantially anhydrous heavy hydrocarbon oil with said surfaces during said refinery processing, said substantially anhydrous heavy hydrocarbon oil containing a foulant-inhibiting amount of an additive comprising at least one tridecyl phosphate compound.

Claim 22

Independent Claim 57 words

A method for reducing fouling of surfaces contacted with a heavy hydrocarbon oil during refinery processing thereof, said method comprising the step of contacting a substantially anhydrous heavy hydrocarbon oil with said surfaces during said refinery processing, said substantially anhydrous heavy hydrocarbon oil containing a foulant-inhibiting amount of an additive comprising at least one tridecyl phosphate compound.

Claim 23

Dependent Claim 28 words

The method defined in claim 18 wherein said heavy hydrocarbon oil is one in which at least about 50 percent boils at a temperature above about 850° F.

Claim 24

Dependent Claim 30 words

The method defined in claim 18 wherein the resultant admixture has better heat transfer characteristics at the incipient fouling temperature than said heavy hydrocarbon oil without said tridecyl phosphate compound.

Claim 25

Dependent Claim 29 words

The method defined in claim 18 wherein said amount of additive is sufficient to provide said tridecyl phosphate in a concentration from about 5 ppmw to about 500 ppmw.

Claim 26

Dependent Claim 48 words

The method in claim 18 further comprising at least one oil-soluble derivative of a hydrazine compound selected from the group consisting of a phenyl hydrazine, totutriazole, monomethyl hydrazine, propoxylated pyrazole, ethoxylated dimethyl pyrazole, di(2-hydroxypropyl)-di(2-hydroxypropoxypropyl) hydrazine, tetra-(hydoxypropoxypropoxypropyl) hydrazine, ethoxylated dimethyl pyroyole, propoxylated dimethyl pyroyole, and tetra-(propoxypropoxypropoxy propoxyl hydroxypropyl) hydrazine.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-04-24	1987-10-24	1988-04-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-04-24	1991-10-24	1992-04-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-04-24	1995-10-24	1996-04-24	$7700.00	Window Closed / Lapsed

Antifoulant for high temperature hydrocarbon processing

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