Process and composition for removing a scale deposit
First Claim
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1. A process for removing one or more scale deposits formed on a surface, comprising the steps of:
- providing a composition having a first pH of less than about 7.5 to prevent polythionic acid stress corrosion cracking to said surface, said composition comprising;
a) an effective amount of an organic acid and/or a salt thereof; and
b) an effective amount of an oxidizing agent selected from the group consisting of a peroxide, a chlorate, a perchlorate, a nitrate, or a permanganate, wherein the organic acid and/or the salt thereof and the oxidizing agent in the composition are in a weight ratio of about 2.5;
1 to about 1;
10;
providing scale deposits comprising primarily metal sulfides and coke formed on said surface, wherein said scale deposits are formed in a hydrocarbon conversion process;
contacting the surface with said composition for a period of time sufficient to remove one or more scale deposits, wherein during said contacting step, the composition has a second pH, said second pH being greater than the first pH.
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Abstract
One exemplary embodiment can be a process for removing one or more scale deposits formed on a surface. The process can include contacting the surface with a composition for a period of time sufficient to remove the scale deposits that comprise coke or metal sulfides or mixtures thereof. Generally, the composition includes an effective amount of an organic acid and/or a salt thereof, and an effective amount of an oxidizing agent.
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Citations
14 Claims
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1. A process for removing one or more scale deposits formed on a surface, comprising the steps of:
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providing a composition having a first pH of less than about 7.5 to prevent polythionic acid stress corrosion cracking to said surface, said composition comprising; a) an effective amount of an organic acid and/or a salt thereof; and b) an effective amount of an oxidizing agent selected from the group consisting of a peroxide, a chlorate, a perchlorate, a nitrate, or a permanganate, wherein the organic acid and/or the salt thereof and the oxidizing agent in the composition are in a weight ratio of about 2.5;
1 to about 1;
10;providing scale deposits comprising primarily metal sulfides and coke formed on said surface, wherein said scale deposits are formed in a hydrocarbon conversion process; contacting the surface with said composition for a period of time sufficient to remove one or more scale deposits, wherein during said contacting step, the composition has a second pH, said second pH being greater than the first pH. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification