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
  • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
• • 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
  • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
  • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
  • C23F11/12—Oxygen-containing compounds
  • C23F11/124—Carboxylic acids

Definitions

• Preferred corrosion inhibitors according to the invention are metal salts of the alkyl substituted and unsubstituted salicyclic acids such as metal salts of salicylic acid, ethyl salicylic acid, isopropyl salicylic acid, n-butyl salicylic acid, isobutyl salicylic acid, tert-butyl salicylic acid, hexyl salicylic acid, diethyl salicylic acid, diisopropyl salicylic acid, ditertiarybutyl salicylic acid, diisobutyl salicylic acid, ditertiary-pentyl salicylic acid, tri-ethyl salicylic acid, and the like.
• metal salts of salicylic acid having at least one but not more than two alkyl substituents each of from about two to about six carbon atoms.
• Metal salts of dialkyl substituted salicylic acids having from two to six carbons per alkyl substituent are most preferred.
• metal ions in the metal salt inhibitors according to the invention may be used monovalent metal ions such as ions of the alkali metals and transition metals, for example, Sodium 1, Potassium I, Lithium 1, Copper 1, and Silver 1,.
• Cuprous (Copper 1) is a preferred metal for inhibitor salts according to the invention.
• Most preferred as inhibitor salts are the cuprous salts of dialkyl substituted salicyclic acids having from two to six carbon atoms per substituent, such as cuprous diisopropyl salicylate, cuprous ditertiary-butyl salicylate, and cuprous ditertiary-pentyl .salicylate. Mixtures of inhibitor salts may be employed.
• the inhibitors according to the invention may be used to prevent corrosion in any non-aqueous solvented cuprous ion olefin separation process. They are especially useful in preventing corrosion in processes which use propionitrile as cuprous salt solvent and which contain a minimum of about 5 percent by weight of cuprous copper such as that described in U-.S.Pat.No. 3,401,112.
• the amount of inhibitor salt added to olefin separation systems may vary widely. Generally suitable for additions of inhibitor salt equivalent to from about 1 to about 20 percent by mole of the cuprous salt present in such cuprous olefin separation systems. When the preferred alkyl substituted metal salicylates are employed, additions of from about 2 percent to about 15 .percent by mole (based on the total-moles of cuprous ion present) are preferred. Especially preferred are additions of from about 3 percent to about 10 percent by mole based on the total moles of cuprous ion present.
• EXAMPLE I A sample of mild carbon steel was prepared and immersed in a non-aqueous solution of cuprous salt suitable for use in olefin separation processes.
• the solution contained 12 percent by weight cuprous ion, supplied as triiluoroacetate and about 1.5 percent by weight of cupric ion.
• Propionitrile was the solvent. Corrosion rate of the steel samples was determined by weight loss of the sample after a measured time interval. The sample was held at C during the test. Without the addition of inhibitor, the corrosion rate as 34 m.p.y. A second sample was immersed in a similar cuprous trifluoroacetate solution in propionitrile to which had been added 5 percent by weight of an inhibitor according to the invention, cuprous ditertiary-butyl salicylate. This propionitrile solution contained 12 percent by weight of cuprous ion and 1.3 percent by weight of cupric ion. The corrosion rate at 100 C. was 3m.p.y.
• nonaqueous solution of copper ions is a propionitrile solution which contains a minimum of about 5 percent by weight of cuprous copper.
• metal salts are selected from the group consisting of cuprous salts of salicylic acids having two alkyl substituents each of from about two to about six carbon atoms and such salt is added in amount equivalent to from about 1 to about 20 percent by mole of the copper ion present.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=21700768

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (4)

Citations (7)

Family Cites Families (2)

• 1970
  • 1970-01-12 US US2439A patent/US3656886A/en not_active Expired - Lifetime
• 1971
  • 1971-01-11 NL NL7100290A patent/NL7100290A/xx not_active Application Discontinuation
  • 1971-01-11 JP JP71305A patent/JPS5335010B1/ja active Pending
  • 1971-01-11 GB GB1296015D patent/GB1296015A/en not_active Expired
  • 1971-01-11 DE DE2100968A patent/DE2100968C2/de not_active Expired
  • 1971-01-11 FR FR7100629A patent/FR2076046B1/fr not_active Expired
  • 1971-01-11 BE BE761426A patent/BE761426A/fr unknown
  • 1971-01-11 CA CA102,398A patent/CA970954A/en not_active Expired

Patent Citations (7)

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