Silicone free anti-foaming process and controlled foaming process for petroleum coking
AssigneeThe University of Tulsa
InventorMichael Volk, JR.
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Abstract
The current invention provides an improved petroleum coking process wherein the risk of silicone poisoning of units downstream of the coke drums is eliminated. The method of the current invention controls the foam layer within the coke drum by injection of a non-silicone anti-foam agent, preferably a tire oil. In another embodiment, the current invention provides a controlled foaming method which increases the liquid production from the coke drum. In the controlled foaming method, an anti-foam agent is cyclically injected into the drum early in the coke drum fill cycle. The cyclic injections manage the foam layer without inducing the induction phase in the coke feedstock, thereby increasing the total volume of feedstock received by the coke drum.
Claims81
A method for precluding foam-over during a petroleum coking operation comprising:
- filling a coke drum with a coke feedstock;
- monitoring the coke feedstock level within said coke drum;
- stopping flow of coke feedstock when said feedstock occupies from about 66% to about 80% of the internal volume of said coke drum;
- injecting a non-silicone anti-foam agent into said coke drum wherein the volume of non-silicone anti-foam agent is sufficient to preclude a foam layer on the surface of said feedstock from entering an overhead line carried by said coke drum and, wherein said step of injecting a non-silicone anti-foam agent begins when said drum is filled between about 60% to about 70% of its total internal capacity;
- wherein said non-silicone anti-foam agent is selected from the group consisting of tire oil having an aromatic concentration by weight greater than 70% and a slurry oil having an aromatic concentration by weight greater than 70%.
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A method for controlling a foam layer in a coke drum during the fill cycle of a coking process comprising:
- filling a coke drum with a coke feedstock;
- during the step of filling said coke drum, monitoring the growth of a foam layer on said feedstock;
- cyclically injecting an anti-foam agent into said coke drum wherein the volume of anti-foam agent is sufficient to reduce the height of said foam layer on said feedstock without initiating the induction period within said feedstock;
- wherein said anti-foam agent is a non-silicone anti-foam agent selected from the group consisting of tire oil having an aromatic concentration by weight greater than 70% and a slurry oil having an aromatic concentration by weight greater than 70%.
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A method for controlling a foam layer in a coke drum during the fill cycle of a coking process comprising:
- filling a coke drum with a coke feedstock;
- during the step of filling said coke drum, monitoring the growth of a foam layer on said feedstock;
- and,
- initiating cyclical injections of an anti-foam agent into said coke drum when said foam layer reaches a height above said feedstock of about one to about ten feet, wherein the volume of anti-foam agent is sufficient to reduce the height of said foam layer on said feedstock without initiating the induction period within said feedstock;
- wherein said anti-foam agent is a non-silicone anti-foam agent selected from the group consisting of tire oil having an aromatic concentration by weight greater than 70% and a slurry oil having an aromatic concentration by weight greater than 70%.
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A method for controlling a foam layer in a coke drum during the fill cycle of a coking process comprising:
- filling a coke drum with a coke feedstock;
- during the step of filling said coke drum, monitoring the growth of a foam layer on said feedstock;
- cyclically injecting an anti-foam agent into said coke drum for a period of about fifteen seconds to about three minutes followed by a rest period of about fifteen seconds to about ten minutes, wherein the volume of anti-foam agent is sufficient to reduce the height of said foam layer on said feedstock without initiating the induction period within said feedstock;
- wherein said anti-foam agent is selected from the group consisting of tire oil having an aromatic concentration by weight greater than 70% and a slurry oil having an aromatic concentration by weight greater than 70%.
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Dependencies are inferred from the claim text.