Method of equipment decontamination

1. A method of equipment decontamination comprising:

(A) introducing a cleaning stream comprising hydrogen and a solvent composition comprising a hydrocarbon solvent and a cutting fluid into the equipment; and

(B) introducing a stream comprising nitrogen into the equipment, wherein the equipment comprises deposits.

2. The method of claim 1 , further comprising introducing a solvent-free hydrogen stream before step (A), wherein the solvent-free hydrogen stream is at a temperature of about 150° C. to about 300° C.

3. The method of claim 1 , wherein step (A) comprises: injecting the solvent composition into a hydrogen stream;

vaporizing the solvent composition with the hydrogen stream; and dispersing the solvent composition with the hydrogen stream.

4. The method of claim 1 , wherein the hydrocarbon solvent is a bicyclic hydrocarbon compound comprising two fused benzene rings.

5. The method of claim 4 , wherein the two fused benzene rings comprise one aromatic ring and on saturated ring.

6. The method of claim 1 , wherein the hydrocarbon solvent comprises a Kb value between 120 Kb and 150 Kb.

7. The method of claim 1 , wherein the hydrocarbon solvent comprises naphthalene, tetralin, decalin, or any combinations thereof.

8. The method of claim 1 , wherein the hydrocarbon solvent is present in an amount ranging between about 60% to about 100% by volume of the solvent composition.

9. The method of claim 1 , wherein the cutting fluid is any material capable of being naturally distilled from crude oil.

10. The method of claim 1 , wherein the cutting fluid comprises diesel, kerosene, naphtha, or any combinations thereof.

11. The method of claim 1 further comprising:

absorbing the deposits, disaggregating the deposits, or any combinations thereof;

and generating a bottoms stream comprising the hydrogen, the solvent composition, and the

absorbed and/or disaggregated deposits.

12. The method of claim 11 further comprising removing at least a portion of the solvent composition and the absorbed and/or disaggregated deposits.

13. The method of claim 1 , wherein the equipment is a reactor comprising a catalyst and wherein the method further comprises removing at least a portion of the catalyst after step (B).

14. A method comprising:

(A) introducing a stream comprising hydrogen into a reactor, wherein the reactor comprises a catalyst, deposits on the catalyst, and other contaminants;

(B) introducing into the stream comprising hydrogen a solvent composition stream comprising a hydrocarbon solvent and a cutting fluid;

(C) vaporizing the solvent composition stream into the stream comprising hydrogen to produce a cleaning stream;

(D) contacting the deposits with the cleaning stream and removing at least a portion of the deposits and/or other contaminants with the cleaning stream; and

(E) introducing a nitrogen stream into the reactor.

15. The method of claim 14 , wherein the hydrogen stream is at a temperature of about 150° C. to about 300° C.

16. The method of claim 14 , wherein the deposits comprise at least one of an unsaturated hydrocarbon, an aromatic hydrocarbon, a hydrocarbon based gum, a hydrocarbon based resin, a heavy oil, or oligomers.

17. The method of claim 14 , wherein the other contaminants are comprised of, but not limited to, hydrogen sulfide, benzene, dispersed combustible materials, or combinations thereof.

18. The method of claim 14 , wherein the hydrocarbon solvent comprises naphthalene, tetralin, decalin, or any combinations thereof.

19. The method of claim 14 , wherein the cutting fluid comprises diesel, kerosene, naphtha, or any combinations thereof.

20. The method of claim 11 further comprising:

generating a bottoms stream from the reactor comprising the cleaning stream and the removed portion of the deposits; and

removing the deposits and at least a portion of the solvent from the bottoms stream to produce a hydrogen waste stream.