GB1591390A - Corrosion inhibiting compositions - Google Patents
Corrosion inhibiting compositions Download PDFInfo
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- GB1591390A GB1591390A GB4547777A GB4547777A GB1591390A GB 1591390 A GB1591390 A GB 1591390A GB 4547777 A GB4547777 A GB 4547777A GB 4547777 A GB4547777 A GB 4547777A GB 1591390 A GB1591390 A GB 1591390A
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- 238000005260 corrosion Methods 0.000 title claims description 34
- 230000007797 corrosion Effects 0.000 title claims description 34
- 239000000203 mixture Substances 0.000 title claims description 24
- 230000002401 inhibitory effect Effects 0.000 title description 3
- 150000001875 compounds Chemical class 0.000 claims description 21
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical group OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 20
- 230000002745 absorbent Effects 0.000 claims description 19
- 239000002250 absorbent Substances 0.000 claims description 19
- -1 amine compound Chemical class 0.000 claims description 17
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical group NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 11
- 229920002873 Polyethylenimine Polymers 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 230000002378 acidificating effect Effects 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 claims description 4
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical group OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims description 4
- LSHROXHEILXKHM-UHFFFAOYSA-N n'-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCN LSHROXHEILXKHM-UHFFFAOYSA-N 0.000 claims description 4
- 229920000768 polyamine Polymers 0.000 claims description 4
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 4
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical group CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- IMUDHTPIFIBORV-UHFFFAOYSA-N aminoethylpiperazine Chemical compound NCCN1CCNCC1 IMUDHTPIFIBORV-UHFFFAOYSA-N 0.000 claims 1
- AQGNVWRYTKPRMR-UHFFFAOYSA-N n'-[2-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCNCCN AQGNVWRYTKPRMR-UHFFFAOYSA-N 0.000 claims 1
- OVFCVRIJCCDFNQ-UHFFFAOYSA-N carbonic acid;copper Chemical compound [Cu].OC(O)=O OVFCVRIJCCDFNQ-UHFFFAOYSA-N 0.000 description 46
- 229910000009 copper(II) carbonate Inorganic materials 0.000 description 46
- 239000011646 cupric carbonate Substances 0.000 description 46
- 235000019854 cupric carbonate Nutrition 0.000 description 46
- 230000000052 comparative effect Effects 0.000 description 29
- 239000004148 curcumin Substances 0.000 description 29
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 16
- 239000003112 inhibitor Substances 0.000 description 15
- 230000005764 inhibitory process Effects 0.000 description 15
- 239000000243 solution Substances 0.000 description 15
- 150000001412 amines Chemical class 0.000 description 5
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 5
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- SOIAEOTUSNFHMI-UHFFFAOYSA-N 2-(2-aminoethylamino)ethane-1,1-diol Chemical compound NCCNCC(O)O SOIAEOTUSNFHMI-UHFFFAOYSA-N 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920000333 poly(propyleneimine) Polymers 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- BBFCIBZLAVOLCF-UHFFFAOYSA-N pyridin-1-ium;bromide Chemical compound Br.C1=CC=NC=C1 BBFCIBZLAVOLCF-UHFFFAOYSA-N 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- MBYLVOKEDDQJDY-UHFFFAOYSA-N tris(2-aminoethyl)amine Chemical compound NCCN(CCN)CCN MBYLVOKEDDQJDY-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/06—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly alkaline liquids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
- C10K1/14—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors organic
- C10K1/143—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors organic containing amino groups
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
(54) CORROSION INHIBITING COMPOSITIONS
(71) We, THE DOW CHEMICAL COMPANY, a corporation organised and existing under the laws of the State of Delaware, United States of America, of Midland, County of
Midland, State of Michigan, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The present invention relates to corrosion inhibiting compositions.
Natural and synthetic gases containing acidic components such as CO2,H2Sand COS have been treated on a commercial scale with aqueous alkanolamine solutions to remove the acidic components. The severe corrosion which results from the presence of these components, particularly in the rich absorbent solution regeneration section, has required maintaining a low concentration of the amine, i.e. 10-30 percent generally, and also a low loading, i.e. the amount of H2S/CO2 in the absorbent solution. In view of the necessity to conserve energy it would be advantageous to load the gas treating solutions more heavily with the acidic components. It would provide a further advantage if more concentrated absorbent solutions could be used.However, to achieve these desired results it would be necessary to prevent any increase in corrosion, and it would be desirable to reduce the corrosion to less than that experienced today at the lower loadings and solution concentrations.
A brief review of the prior art discloses that numerous patents have taught the use of various polyamines as corrosion inhibitors for various fluids:
For example, United States Patent No.3,262,791 describes the use of polyalkylenimines of molecular weight above 800 for prevent corrosion of iron, steel and ferrous alloys when using slushing oils.
United States Patent No. 2,143,393 disclosed absorbing acid gases in an aqueous solution of a polymerized alkylenimine.
Many nitrogen containing compounds have been disclosed in the art as useful as corrosion inhibitors, but only a few are commercially acceptable. It is evident to one skilled in the art operating a commercial installation that the old limitations on concentration of absorbent and loading of the absorbent solution, while improved to some extent with these few commercially accepted inhibitors, are not satisfactory for meeting the demands for more efficient operation, higher absorbent concentrations and higher loading, brought on by the energy shortage.
According to the present invention there is provided a corrosion inhibited absorbent solution for the removal of acidic components from natural and synthetic gases, which comprises an aqueous alkanolamine solution containing (1) an amine compound or mixture of compounds having the formula:
wherein n is an integer of from 1 to 3, m is an integer of from 2 to an integer sufficient to yield a molecular weight of up to 800, R1, R2, R3 and R4 each independently represent -H, Cn, H2n, OH, or -Cn, H2n, N(R3)R4, and n' is the integer 1 or 2, or wherein R,R4 and R2R3 are joined together as the group -Cn,H2n',-and n' is 2; said amine compound being present in an amount of from 10 to 2000 parts by weight per million parts by volume of absorbent solution; (2) from 0 to 1000 parts by weight per million parts by volume of absorbent solution of copper or a copper ion-yielding compound and (3) from 0 to 1000 parts by weight per million parts by volume of absorbent solution of sulfur or a sulfur atom-yielding compound.
Amine compounds falling within the scope of the definition given above are polyethylenimine (polyethylene polamines) having molecular weights in the range of 60 to 800 which may be mixtures of several amines, for example a commercial polyalkylene polyamine identified as EA-10 (or E-100) containing 8-9 weight percent tetraethylenepentamine, 30-35 weight percent pentaethylenehexamine, 55 weight percent hexaetyleneheptamine and the remainder branched and cyclic isomers having an average molecular weight in the range of from 250 to 300; polyethylenimines such as PEI 3 (molecular weight 300+ 50) and PEI 6 (molecular weight about 600); EA-17 tris(aminoethyl)amine (about 90 percent branched); EA-19 pentaethylenehexamine (MW about 232);EA-15 (a mixture of 35-45 percent diethylenetriamine, 10-15 percent triethylenediamine, 5-15 percent piperazine);
EA-11 (85 weight percent aminoethylpiperazine-15 weight percent diethylenetriamine mixture); 1, 2polypropylenimine, tetraethylenepentamine, triethylenetetramine, diethylenetriamine, ethylenediamine and dihydroxyethyl ethylenediamine.
Copper metal or copper ion-yielding compounds such as CuCO3 and/or sulfur or a sulfur ion-yielding compound such as H2S or COS may be employed.
The inhibitors are most effective in diethanolamine solutions where the H2S to CO2 volume per volume ratio is within the range of 10/1 to 1/10. The performance of the inhibitors is comparable to that of inhibitors now in use where the gas being treated contains
H2S and CO2 in proportions up to 40 parts by volume of CO2 per part by volume of H2S. The absorbents DEA and MDEA are more effectively protected against corrosion than by using present inhibitor systems when only H2S is present, but the results are not as dramatic as when CO2 is present also.
The alkanolamines which have been employed as absorbents for the acidic gas are the mono C2-3 alkanolamines, such as monoethanolamine (MEA), monoisopropanolamine (MI
PA), the dialkanol C2-3 amines, such as diethanolamine (DEA) and their N-alkyl substituted derivatives, i.e., methyl diethanolamine (MDEA). The dialkanolamines show marked improvement in corrosion protection when the inhibitors of the present invention are employed.
Procedure:
The laboratory data were obtained from tests run in a modified Sparkler Filter at 40 psig (2.8 kg./cm.2) at a temperature of 125"C. for about 17 hours. All 1020 mild steel test specimens (which had been acid etched in 5 Normal hydrochloric acid, washed with soap, rinsed with water and acetone and weighed) were placed in 4-oz (114 g.) bottles containing the inhibitor to be tested and 50% by volume diethanolamine (DEA) -50 percent by volume water and saturated with H2S/CO2 at various gas ratios. The total liquid volume in each bottle at the start of the experiment was 120 mls. At the end of the experiment, the mild steel specimens were again etched in acid (containing HC1 inhibitor), washed with soap and water, rinsed with acetone and weighed.The corrosion rate and percent inhibition were calculated using the before and after weighing of the mild steel specimens according to the following equations:
534W
corrosion rate/yr = DA (6.45 cm.2)T in.2 where W = weight loss in mg; D = Density of specimen in gm/cc; A= area in square inches; and T= exposure in hours.
% inhibition = (avg. corrosion rate of blank - corrosion rate of test specimen) x 100
avg. corrosion rate of blank
Each of the following tables shows the experiments conducted and the results obtained in a series of tests. The corrosion rate for the uninhibited, blank tests was run for each series to enable a direct comparison to be made with the other tests run in that series.
In each of the Tables the concentrations of inhibitors are expressed as weight of inhibitor per volume of absorbent solution. The only exceptions are where a given volume of an amine inhibitor was added as part of the inhibitor system. The absorbent solutions shown at the top of each of the tables were prepared on a weight:weight basis, the gas ratios being volume by volume.
In each table the corrosion rate is both expressed in mils/yr. (MPY) and in mm./yr. (MPY x 0.0254).
The following abbreviations are used in reference to the materials shown in the tables.
E-100 Polyethylene polyamine, mol. wt. 250-300
PEI 6 Polyethylenimine, average mol. wt. 600
TRT-3 Commercial inhibitor
EA-75 Polyethylenimine (E-75) filtered solids from E-100
PEI 3 Polyethylenimine, average mol. wt. 300
RCC-9 Tetradecylalkyl pyridinium bromide
FO-6 Commercial quaternary amine TABLE I 50% DEA H2S/CO2 9/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr) Inhibition 1. Blank 32(0.81) 2. CuCO3 (Comparative) 100 14(0.36) 55 3. " " 1000 10(0.25) 69 4. CuCO3 + 10 cc MEA " 100 5(0.13) 82 5. " " " " 1000 5(0.13) 82 6. CuCO3 + 10 cc MEA + S " 100 100 6(0.15) 82 7. " " " " " 1000 100 5(0.13) 82 8. " " " " " 100 1000 5(0.13) 82 9. S " 100 34(0.86) -7 10. 10 cc MEA " 33(0.84) -5 11. E-100 " 1 13(0.33) 60 12. " 10 3(0.08) 91 13. " 100 1(0.025) 96 14. CuCO3 in DEA(1) (Comparative) 10 14(0.36) 55 15. S in 10 cc MEA " 10 28(0.71) 11 16.E-100 + CuCO3 " 1 10 1(0.025) 96 17. " " " 10 10 1(0.025) 96 18. " " " 10 100 1(0.025) 96 19. E-100 + CuCO3 + S (Comparative) 1 10 2(0.05) 94 20. " " " " 10 10 10 1(0.025) 96 21. " " " " 10 100 10 1(0.025) 96 22. " " " " 10 100 100 2(0.05) 95 (1) 10 cc 50% aqueous DEA.
TABLE II 50 % DEA H2S/CO2 9/1
Corrosion
Rate,MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 40(1.02) 2. PEI 6 100 4(0.10) 91 3. " 1000 6(0.15) 86 4. " 2000 5(0.13) 85 5. PEI 6 + CuCO3 100 1000 3(0.08) 93 6. " " 1000 100 3(0.08) 93 7. " " 1000 1000 3(0.08) 93 8. PEI 6 + CuCO3 + S 1000 100 1000 3(0.08) 93 9. " " " 1000 1000 100 3(0.08) 93 10. PEI 6 + CuCO3 + MEA 10 cc 1000 1000 2(0.05) 95 TABLE III 50 % DEA H2S/CO2 9/1
Corrosion
Rate,MPY Percent
Compound PPM PPM (mm./yr.) Inhibition 1. Blank 21(0.53) 2. E-100 100 2(0.05) 91 3. " 1000 2(0.05) 91 4. " 2000 2(0.05) 91 5. PEI 6 1000 3(0.08) 87 6. E-100 + PEI 6 1000 1000 2(0.05) 91 7.E-100 + 10 cc MEA 1000 2(0.05) 91 8. 10 cc MEA (Comparative) 28(0.71) -33 TABLE IV 50% DEA H2S/CO2 9/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1.Blank 50(1.27) 2. EDA(1) 10 38(0.96) 23 3. " 100 22(0.56) 55 4. TETA(2) 10 33(0.84) 35 5. " 100 20(0.51) 59 6. TEPA(3) 10 26(0.66) 47 7. " 100 13(0.33) 74 8. PEI-3 10 3(0.08) 94 9. " 100 1.5(0.04) 97 10. EDA + CuCO3 + S 10 10 10 38(0.96) 23 11. " " " 100 10 10 15(0.38) 71 12. TETA + CuCO3 + S 10 10 10 16(0.41) 69 13. " " " 100 10 10 5(0.13) 90 14. TEPA + CuCO3 + S 10 10 10 5(0.13) 90 15. " " " 100 10 10 4(0.10) 92 16. PEI-3 + CuCO3 + S 10 10 10 2(0.05) 96 (1) Ethylenediamine (2) Triethylenetetramine (3) Tetraethylenepentamine TABLE V 50% DEA H2S/CO2 1/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 25(0.63) 2.E-100 (comparative) 1 7(0.18) 74 3. " 10 5(0.13) 80 4. " 100 2(0.05) 94 5. " 1000 2(0.05) 94 6. CuCO3 (comparative) 100 8(0.20) 69 7. " (comparative) 1000 7(0.18) 75 8. S (comparative) 100 23(0.58) 10 9. " " 1000 24(0.61) 7 10. E-100 + CuCO3 + S 1000 100 1000 1(0.025) 96 11. " " " 1000 1000 1000 1(0.025) 96 12. CuCO3 + S (comparative) 1000 1000 8(0.20) 67 TABLE VI 50% DEA CO2/H2S 10/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 6(0.15) 2. E-100 (comparative) 1 3(0.08) 50 3. " 10 1(0.025) 83 4. " 100 1(0.025) 83 5. " 1000 0.5(0.01) 92 6. PEI-3 10 0.6(0.01) 90 7. " 1000 0.5(0.01) 92 8. E-100 + CuCO3 + S 10 10 10 0.9(0.02) 86 9. PEI-3 + CuCO3 + S 10 10 10 1(0.025) 83 10. CuCO3 + S (comparative) 10 10 7(0.18) -16 11.CuCO3 (comparative) 10 7(0.18) -16 TABLE VII 50% DEA H2S/CO2/COS 8/1/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 48(1.22) 2. E-100 1000 1.4(0.03) 97 3. E-75 1000 1.5(0.04) 97 4. PEI-3 1000 1.2(0.03) 98 5. PEI-6 1000 1.6(0.04) 97 6. CuCO3 (comparative) 1000 8.7(0.22) 82 7. E-100 + CuCO3 + S 10 10 10 3.2(0.08) 93 8. E-100 10 19.2(0.49) 60 9. PEI-3 10 2.6(0.07) 95 10. PEI-3 + CuCO3 + S 10 10 10 2.2(0.06) 95 11. 1,2-polypropyleneimine 1000 8(0.20) 83 TABLE VIII 70% DEA H2S/CO2 9/1
Corrosion
Rate, MPY Percent
Compound PPM PPM (mm./yr.) Inhibition 1. Blank 29(0.74) 2. E-100 10 12(0.30) 59 3. PEI-6 10 13(0.33) 56 4. " 1000 1.8(0.05) 94 5. CuCO3 (comparative) 100 9(0.23) 67 6. " " 1000 5.5(0.14) 81 7. PEI-6 + CuCO3 10 100 2.4(0.06) 92 8. " " 1000 100 1.5(0.04) 95 9. " " 10 1000 1.6(0.04) 94 10.E-100 + CuCO3 10 10 10.8(0.27) 63 11. " " 1000 10 1.3(0.03) 95 TABLE IX 50% N-Methyl DEA H2S/CO2 9/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 26(0.66) 2. E-100 10 18.5(0.47) 29 3. " 100 2.1(0.05) 92 4. EA-75(E-75) 10 21.5(0.54) 18 5. " " 100 1.8(0.05) 93 6. PEI-3 10 2.4(0.06) 91 7. " 100 1.6(0.04) 94 8. PEI-6 10 2.6(0.07) 90 9. " 100 2.0(0.05) 92 10. CuCO3 (comparative) 10 16.5(0.42) 37 11. CuCO3 + S (comparative) 10 10 17(0.43) 35 12. S (comparative) 10 27(0.68) -4 13. E-100 + CuCO3 + S 10 10 10 2.3(0.06) 91 14. EA-75 + CuCO3 + S 10 10 10 2.6(0.07) 90 15. PEI-3 + CuCO3 + S 10 10 10 2(0.05) 92 16. PEI-6 + CuCO3 + S 10 10 10 2.8(0.07) 89 TABLE X 50% N-METHYL DEA CO2/H2S 10/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 20(0.51) 2.E-100 10 1.5(0.04) 92 3. " 1000 1.2(0.03) 94 4. PEI-3 10 1.2(0.03) 94 5. " 1000 0.3(0.01) 98 6. E-100 + CuCO3 + S 10 10 10 1.2(0.03) 94 7. PEI-3 + CuCO3 + S 10 10 10 1.0(0.03) 95 8. CuCO3 + S (comparative) 10 10 11(0.28) 45 9. CuCO3 (Comparative) 1000 7(0.18) 65 TABLE XI 50% N-METHYL DEA CO2/H2S 50/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 8.6(0.22) 2. E-100 10 0.7(0.02) 92 3. " 100 0.9(0.02) 90 4. " 1000 0.8(0.02) 90 5. E-100 + CuCO3 + S 10 10 10 1.3(0.03) 85 6. CuCO3 + S (comparative) 10 10 6.1(0.15) 29 7. CuCO3 (comparative) 10 7.4(0.19) 13 8. FO-6 (comparative) 1000 6.5(0.17) 24 9. RCC-9 (comparative) 500 6.2(0.16) 28 10. NH4SCN (comparative) 50 6.0(0.15) 30 11. RCC-9 + NH4SCN 500 50 5.0(0.13) 42 (comparative) 12. FO-3 + NH4SCN 1000 50 3.3(0.08) 62 (comparative) 13. RCC-9 + NH4SCN + E-100 500 50 10 2.4(0.06) 72 14. " " " 500 50 100 1.2(0.03) 86 15. " " " 500 50 1000 0.9(0.02) 89 16. FO-3 + NH4SCN + E-100 1000 50 10 1.8(0.05) 78 17. " " " 1000 50 100 1.0(0.03) 88 TABLE XII 30% MEA H2S/CO2 9/1
Corrosion
Rate, MPY Percent
Compound PPM PPM PPM (mm./yr.) Inhibition 1. Blank 25(0.64) 2. E-100 10 10.2(0.26) 58 3. " 100 6.5(0.17) 73 4. E-75 10 10.8(0.27) 57 5. " 100 6.2(0.16) 75 6. PEI-3 10 4.4(0.11) 82 7. " 100 2.5(0.06) 90 8. PEI-6 10 7.7(0.20) 69 9. " 100 6.2(0.16) 75 10. E-100 + CuCO3 + S 10 10 10 4.2(0.11) 83 11. E-75 + CuCO3 + S 10 10 10 4.0(0.10) 84 12. PEI-3 + CuCO3 + S 10 10 10 5.0(0.13) 80 13. PEI-6 + CuCO3 + S 10 10 10 3.0(0.08) 88 14. CuCO3 + S (comparative) 10 10 13(0.33) 48 TABLE XIII 40% MIPA H2S/CO2 9/1
Corrosion
Rate, MPY Percent
Compound PPM (mm./yr.) Inhibition 1. Blank 15(0.38) 2. E-100 1000 3.2(0.08) 79 3. E-75 1000 4.0(0.10) 73 4. PEI-3 1000 1.2(0.03) 92 5. PEI-6 1000 3.2(0.08) 78 6. TRT-3 (comparative) 1000 6.5(0.17) 57 7. CuCO3 (Comparative) 1000 2.8(0.07) 81
Claims (15)
1. A corrosion inhibited absorbent solution for the removal of acidic components from natural and synthetic gases, which comprises an aqueous alkanolamine solution containing (1) an amine compound or mixture of compounds having the formula
wherein n is an integer of from 1 to 3, m is an integer of from 2 to an integer sufficient to yield a molecular weight of up to 800, R1, R2, R3 and R4 each independently represent -H, -Cn'H2n'OH, or -CntH2n N(R3)R4, and n' is the integer 1 or 2, or RlR4 and R2R3 are joined together as the group Cn'H2n- and n' is 2; said amine compound being present in an amount of from 10 to 2000 parts by weight per million parts by volume of absorbent solution; (2) from 0 to 1000 parts by weight per million parts by volume of absorbent solution of copper or a copper ion-yielding compound; and (3) from 0 to 1000 parts by weight per million parts by volume of absorbent solution of sulfur or a sulfur atom-yielding compound.
2. A composition as claimed in claim 1 wherein the amine compound is a polyethylene polyamine having an average molecular weight in the range of from 250 to 300.
3. A composition as claimed in claim 1 wherein the amine compound is a polyethylenimine having an average molecular weight of 300.
4. A composition as claimed in claim 1 wherein the amine compound is a polyethylenimine having an average molecular weight of 600.
5. A composition as claimed in claim 1 wherein the amine compound is a mixture of 35 to 45 weight percent diethylenetriamine, 10 to 15 weight percent triethylenediamine
and 5 to 15 weight percent piperazine.
6. A composition as claimed in claim 1 wherein the amine compound is pentaethylene hexamine.
7. A composition as claimed in claim 1 wherein the amine compound is diethylenetriamine.
8. A composition as claimed in claim 1 wherein the amine compound is tetraethylene pentaamine.
9. A composition as claimed in claim 1 wherein the amine compound is a solids free mixture of 8 to 9 weight percent tetraethylene pentamine, 30 to 35 weight percent pentaethylene hexamine and 55 weight percent hexaethylene heptamine, the balance being branched and cyclic isomers having an average molecular weight in the range of from 250 to 300.
10. A composition as claimed in claim 1 wherein the amine compound is a mixture of 85 weight percent aminoethyl piperazine and 15 weight percent diethylenetriamine.
11. A composition as claimed in claim 1 wherein the alkanolamine is monoethanolamine.
12. A composition as claimed in claim 1 wherein the alkanolamine is diethanolamine.
13. A composition as claimed in claim 1 wherein the alkanolamine is monoisopropanolamine.
14. A composition as claimed in claim 1 wherein the alkanolamine is N-methyl diethanolamine.
15. A corrosion inhibited absorbent solution as claimed in claim 1 substantially as hereinbefore described with reference to any one of the Examples.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4547777A GB1591390A (en) | 1977-11-01 | 1977-11-01 | Corrosion inhibiting compositions |
| MY182/82A MY8200182A (en) | 1977-11-01 | 1982-12-30 | Corrosion in inhibiting compositions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4547777A GB1591390A (en) | 1977-11-01 | 1977-11-01 | Corrosion inhibiting compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1591390A true GB1591390A (en) | 1981-06-24 |
Family
ID=10437362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4547777A Expired GB1591390A (en) | 1977-11-01 | 1977-11-01 | Corrosion inhibiting compositions |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB1591390A (en) |
| MY (1) | MY8200182A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2435604A4 (en) * | 2009-05-26 | 2015-09-30 | Baker Hughes Inc | PROCESS FOR REDUCED METAL CORROSION |
-
1977
- 1977-11-01 GB GB4547777A patent/GB1591390A/en not_active Expired
-
1982
- 1982-12-30 MY MY182/82A patent/MY8200182A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2435604A4 (en) * | 2009-05-26 | 2015-09-30 | Baker Hughes Inc | PROCESS FOR REDUCED METAL CORROSION |
Also Published As
| Publication number | Publication date |
|---|---|
| MY8200182A (en) | 1982-12-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |