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1. (WO2019067700) METHOD FOR WEAKENING AND REMOVING COKE AND CARBONACEOUS DEPOSITS
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We Claim:

1. A method for the weakening of coke or other carbonaceous deposits on the inside walls of coils, piping, tubing, and other general hydrocarbon processing equipment comprising: exposing said equipment to a pressurized gas, allowing sorption of gas into the coke or other carbonaceous deposit, and then depressurizing the equipment and contents of said gas, wherein said gas includes carbon dioxide.

2. The method of claim 1 , further comprising sealing and pressurizing said equipment.

3. The method of claim 1 , wherein the pressure of the gas stream is in a range between about 50 and 5,000 psi.

4. The method of claim 1, wherein the gas is a mixture containing carbon dioxide and one or more secondary component gases.

5. The method of claim 4, wherein the secondary component gas is selected from methane or a higher hydrocarbon.

6. The method of claim 4, wherein the secondary component is gas is hydrogen.

7. The method of claim 4, wherein the secondary component gas includes oxygen.

8. The method of claim 4, wherein the secondary component gas includes nitrogen.

9. The method of claim 1, wherein the gas and/or the coke or other carbonaceous deposit is heated above ambient temperature during the treatment.

10. The method of claim 1, wherein depressurization is at sufficient rate to remove loosened deposits from the furnace.

1 1. The method of claim 1, comprising the additional subsequent step of passing a flow of gas through the equipment to sweep the loosened deposits from the equipment.

12. The method of claim 1, comprising the additional subsequent step of performing mechanical cleaning treatment to remove weakened deposits from equipment.

13. The method of claim 12 wherein the mechanical cleaning treatment is completed by SandJet™.

14. The method of claim 12 wherein the mechanical cleaning treatment is completed by pigging.