Molecular enhanced based Surface Enhanced Raman Spectroscopy to detect low concentration of monoethanolamine
A system and method for estimating a concentration of monoethanolamine (MEA) in a fluid. A substrate for supporting a sample of the fluid during testing includes a carbon nanotube mat layer, a silver nanowire layer disposed on the carbon nanotube mat layer, and a chemical enhancer layer disposed on the silver nanowire layer. A sample of the fluid is placed on the substrate, and the fluid sample is radiated with electromagnetic radiation at a selected energy level. A detector measures a Raman spectrum emitted from the sample in response to the electromagnetic radiation. A processor estimates the concentration of MEA in the sample from the Raman spectrum and adds a corrosion inhibitor to the fluid in an amount based on the estimated concentration of MEA to reduce the concentration of MEA in the fluid.
1. A method of estimating a concentration of monoethanolamine (MEA) in a fluid, comprising:
placing a sample of the fluid on a substrate including:
a carbon nanotube mat layer,
a silver nanowire layer disposed on the carbon nanotube mat layer, and
a chemical enhancer layer disposed on the silver nanowire layer, wherein the fluid sample is placed on the chemical enhancer layer;
radiating the fluid sample with electromagnetic radiation at a selected energy level;
measuring a Raman spectrum emitted from the fluid sample in response to the electromagnetic radiation;
estimating the concentration of MEA in the sample fluid from the Raman spectrum; and
adding a corrosion inhibitor to the fluid in an amount based on the estimated concentration of MEA to reduce the concentration of MEA.
2. The method of claim 1 , wherein the chemical enhancer layer includes a chemical having a thiol group for bonding to the silver nanowire layer and at least one of a carboxyl group and a boronyl group for bonding to the MEA.
3. The method of claim 1 , wherein the chemical enhancer layer includes at least one of: 4-mercaptobenzoic acid (4-MBA), 2-mercaptopyridine, 4-bromothiophenol, and 4-nitrothiophenol.
4. The method of claim 3 , wherein the chemical enhancer layer further includes gold nanoparticles, wherein the gold nanoparticles are in contact with the silver nanowires and the at least one of the 4-MBA, 2-mercaptopyridine, 4-bromothiophenol, and 4-nitrothiophenol is disposed on top of the gold nanoparticles.
5. The method of claim 1 , wherein chemical enhancer layer includes gold nanoparticles.
6. The method of claim 1 , further comprising determining a presence of MEA at concentration levels equal to or greater than about 50 part per billion.
7. The method of claim 1 , wherein the fluid is from a refinery, further comprising adding the corrosion inhibitor to the fluid to prevent corrosion in the refinery.
8. A system for estimating a concentration of monoethanolamine (MEA) in a fluid, comprising:
a source of electromagnetic radiation for radiating a sample of the fluid at a selected energy level;
a substrate for supporting the sample during testing, the substrate including:
a carbon nanotube mat layer,
a silver nanowire layer disposed on the carbon nanotube mat layer, and
a chemical enhancer layer disposed on the silver nanowire layer;
a detector configured to measure a Raman spectrum emitted from the sample in response to the electromagnetic radiation; and
a processor configured to:
estimate the concentration of MEA in the sample from the Raman spectrum, and
add a corrosion inhibitor to the fluid in an amount based on the estimated concentration of MEA to reduce the concentration of MEA in the fluid.
9. The system of claim 8 , wherein the chemical enhancer layer includes a chemical having a thiol group for bonding to the silver nanowire layer and at least one of a carboxyl and a boronyl group for bonding to the MEA.
10. The system of claim 8 , wherein the chemical enhancer layer includes at least one of: 4-mercaptobenzoic acid (4-MBA), 2-mercaptopyridine, 4-bromothiophenol, and 4-nitrothiophenol.
11. The system of claim 10 , wherein the chemical enhancer layer further includes gold nanoparticles, wherein the gold nanoparticles are in contact with the silver nanowires and the at least one of the 4-MBA, 2-mercaptopyridine, 4-bromothiophenol, and 4-nitrothiophenol is disposed on top of the gold nanoparticles.
12. The system of claim 8 , wherein chemical enhancer layer includes gold nanoparticles.
13. The system of claim 8 , wherein the chemical enhancer layer enables determining a presence of MEA at concentration levels equal to or greater than about 50 part per billion.
14. The system of claim 8 , wherein the fluid is from a refinery, further comprising adding the corrosion inhibitor to the fluid to prevent corrosion in the refinery.
15. The system of claim 8 , wherein the fluid is from one of: (i) a fluid passage at a downstream location of a completion process; (ii) a fluid passage at a downstream location of a crude wash process; and (iii) a fluid passage of an overhead tower of a petroleum refinery.