CA1195219A - Process for cleaning metal surfaces - Google Patents
Process for cleaning metal surfacesInfo
- Publication number
- CA1195219A CA1195219A CA000436755A CA436755A CA1195219A CA 1195219 A CA1195219 A CA 1195219A CA 000436755 A CA000436755 A CA 000436755A CA 436755 A CA436755 A CA 436755A CA 1195219 A CA1195219 A CA 1195219A
- Authority
- CA
- Canada
- Prior art keywords
- metal surface
- poly
- process according
- contacting
- deposits
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Detergent Compositions (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Abstract of the Disclosure A process for removing deposits on metal surfaces, derived from certain poly(arylene sulfide) polymers is provided by contacting the metal surfaces with a polyamine containing compound under conditions suitable to remove said deposits on the metal surfaces.
Description
~5~ 3080~CA
PROCESS FOR CLEANING M~TAL SURFAOES
This invention relates to a process for cleaning metal surfaces containing poly(arylene sulfide) based deposits.
In the production of poly(arylene sulfide) polymers various impurities such as polymer gel and inorganic materials are present in the polymer and can deposit on -the surfaces of the production equipment.
Materials derived from the polymer can also be formed during processing -the produced polymer, such as in synthetic fiber production. Machine parts utilized in processing the produced polymer which contain poly(arylene sulfide) and impurities and which must be cleaned for re-use include spinnerettes, dies, pack parts, and filters.
Sometimes the poly(arylene sulfide) deposits may be removed mechanically, bu-t the job is tedious and time consuming due to the complexity of the equipment. Also, the deposits can be removed by "burn out" procedures where the metal par-ts containing the deposits are placed in forced air furnaces and the extreme heat applied removes them. This "burn out" procedure will no-t work for cleaning all deposits from metal surfaces such as the specific case of poly(phenylene sulfide) based deposits. In this case, burn out will result in a metal surface which is corroded. Therefore, new processes which will readily remove the deposits without having a corrosive or other deleterious effect on processing equipment are therefore greatly desirable.
It is therefore an object of this invention to provide a process for removing deposits on metal surfaces derived from poly(arylene sulfides).
Other aspec-ts, objects, and the several advantages oE the present invention will become apparent from this specific-~tlon and the claims.
In accordance with the presen-t invention, it has been discovered that deposits on metal surfaces derived from a poly(arylene sulfide) polymer can be removed by contacting the me-tal surfaces with a-t least one polyamine compound, represented by the general formula l3 RlR2N(CH2)X[N(cH2)x]nNRlR2 wherein R1 and R2 can be hydrogen or an alkyl radical having from 1 to 10 carbon atoms; R3 can be hydrogen or an alkyl radical having 1 to 6 carbon atoms; x can be 1, 2, or 3; and n can be any integer from 1 -to 4, a-t a temperature and for a time sufficient -to remove said deposits from the surface of said metal.
~xamples of polyamines suitable for use in the process of -this invention include:
diethylenetriamine triethylenetetramine tetraethylenepentamine N,N,N',N'~N"-pentamethyldie-thylenetriamine N,N,N',N',N"-pentapropyldiethylenetriamine N,N'-dimethyldiethylenetriamine N,N',N"-triethyldie-thylenetriamine N,N,N',N',N",N"'-hexamethyltriethylenetetramine and mixtures thereof.
The term "poly(arylene sulfide) polymer" as used in this specification is intended to include polymers of the type which are prepared as described in V.S. Patent 3,354,129 and U.S. Patent 3,919,177.
30 As disclosed in U.S. 3,354,129, these polymers can be prepared by reacting a polyhalo-substituted cyclic compound containing unsaturation between ad.jacent rings and an alkali metal sulfide in a polar organic compound. The resulting polymer contains the cylcic structure of the polyhalo-substituted compound coupled in repeating units through a sulfur atom. The polymers which are preferred for use in this invention, because of their frequen-t occurence in polymer production and processing, are those p~lyters having the repeating unit -R-S- where R is phenylene, , .
3 ~5Z~9 biphenylene, naphthylene, biphenylene ether, or a lower alkyl-substitu-ted derivative thereof. By "lower alkyl" is meant alkyl groups having one ~o six carbon atoms such as methyl, propyl, isobu-tyl, n-hexyl, etc. Polymer can also be made according to a process utilizing a p-dihalobenzene and an alkali metal sulfide, an organic amide, and an alkali metal carboxylate as in U.S. Patent 3,919~177.
Suitable polyamines to be used as the cleaning agent should exhibit some solubility for the particular poly(arylene sulfid~) polymer being removed. Such polyamine should preferably have a boiling point greater than about 200C as their use a-t such a temperature has exhibited enhanced cleaning results.
In carrying out the process of -the presen-t invention, the metal surfaces to be cleaned are contacted with the polyamine cleaning solution in any suitable manner and heated at a temperature and for a time sufficient to effect removal of the deposits for the metal surface.
Generally, the metal surfaces should be contacted wi-th the polyamine solution a-t a temperature above about 200C and preferably above about 250C for a period of time from about 0.5 hours to about 24 hours.
The cleaned metal surfaces are then removed from the bath and contacted with any solvent, such as methanol, which will remove any polyamine remaining on the surface o:E the metal. Then the me-tal surfaces are contacted with water, dried, and treated with concentrated HNO3 to remove any remaining contaminants on the metal surface.
In order to provide a clearer understanding of the present invention, but without limiting the scope -thereof, -the following examples are presented.
Example I
Poly(phenylene sulfide) (PPS) having a mel-t flow between 200 and 400 as measured at 315C/5Kg (ASTM D-123S, Modified Procedure B) was extruded at about 300C through a screen-pack comprised of ~ meta:L
screens (1.56 :inches diameter) ~0/80/200/Dynalloy X13L mesh s:ize placed on top of one another. After several hours extnlsion, the screens containing poly(phenylene sulfide) deposits were removed and immersed in 200 milliliters of triethylenetetramine and the solution heated at about 260DC for 6 hours. The screens were removed from the hot amine solution and soaked in methanol at 25C for 1 hour to remove the amine. The screens were then wa-ter soaked at 25C for 1 hour, air dried and trea-ted with concentratP HN03 for about 30 Minutes at 25C to remove any remaining deposits. Weighing the screen pack before and after cleaning revealed that flbout 85 weight percent of PPS-deposits were removed indicating good cleaning. Repeating the process at 200C and 280~C gave about 52 weight percent and 9~ weight percent 9 respectively of PPS-contaminants removal.
The process was repeated using a glycol and two hydroxy amines to detexmine their efficiency as a rleaner. None of the liquids te~ted were satisfactory in removing PPS-deposits rom metals. These results along with that of a commexcial cleaner are listed in Table I. The results from the triethylenetetramine cleaning ~re also listed for comparison.
Sonditions Run No. Cleaner ~C Hours Results 15 Controls:
1 Triethylene Glycol 250 4 No cleaning
PROCESS FOR CLEANING M~TAL SURFAOES
This invention relates to a process for cleaning metal surfaces containing poly(arylene sulfide) based deposits.
In the production of poly(arylene sulfide) polymers various impurities such as polymer gel and inorganic materials are present in the polymer and can deposit on -the surfaces of the production equipment.
Materials derived from the polymer can also be formed during processing -the produced polymer, such as in synthetic fiber production. Machine parts utilized in processing the produced polymer which contain poly(arylene sulfide) and impurities and which must be cleaned for re-use include spinnerettes, dies, pack parts, and filters.
Sometimes the poly(arylene sulfide) deposits may be removed mechanically, bu-t the job is tedious and time consuming due to the complexity of the equipment. Also, the deposits can be removed by "burn out" procedures where the metal par-ts containing the deposits are placed in forced air furnaces and the extreme heat applied removes them. This "burn out" procedure will no-t work for cleaning all deposits from metal surfaces such as the specific case of poly(phenylene sulfide) based deposits. In this case, burn out will result in a metal surface which is corroded. Therefore, new processes which will readily remove the deposits without having a corrosive or other deleterious effect on processing equipment are therefore greatly desirable.
It is therefore an object of this invention to provide a process for removing deposits on metal surfaces derived from poly(arylene sulfides).
Other aspec-ts, objects, and the several advantages oE the present invention will become apparent from this specific-~tlon and the claims.
In accordance with the presen-t invention, it has been discovered that deposits on metal surfaces derived from a poly(arylene sulfide) polymer can be removed by contacting the me-tal surfaces with a-t least one polyamine compound, represented by the general formula l3 RlR2N(CH2)X[N(cH2)x]nNRlR2 wherein R1 and R2 can be hydrogen or an alkyl radical having from 1 to 10 carbon atoms; R3 can be hydrogen or an alkyl radical having 1 to 6 carbon atoms; x can be 1, 2, or 3; and n can be any integer from 1 -to 4, a-t a temperature and for a time sufficient -to remove said deposits from the surface of said metal.
~xamples of polyamines suitable for use in the process of -this invention include:
diethylenetriamine triethylenetetramine tetraethylenepentamine N,N,N',N'~N"-pentamethyldie-thylenetriamine N,N,N',N',N"-pentapropyldiethylenetriamine N,N'-dimethyldiethylenetriamine N,N',N"-triethyldie-thylenetriamine N,N,N',N',N",N"'-hexamethyltriethylenetetramine and mixtures thereof.
The term "poly(arylene sulfide) polymer" as used in this specification is intended to include polymers of the type which are prepared as described in V.S. Patent 3,354,129 and U.S. Patent 3,919,177.
30 As disclosed in U.S. 3,354,129, these polymers can be prepared by reacting a polyhalo-substituted cyclic compound containing unsaturation between ad.jacent rings and an alkali metal sulfide in a polar organic compound. The resulting polymer contains the cylcic structure of the polyhalo-substituted compound coupled in repeating units through a sulfur atom. The polymers which are preferred for use in this invention, because of their frequen-t occurence in polymer production and processing, are those p~lyters having the repeating unit -R-S- where R is phenylene, , .
3 ~5Z~9 biphenylene, naphthylene, biphenylene ether, or a lower alkyl-substitu-ted derivative thereof. By "lower alkyl" is meant alkyl groups having one ~o six carbon atoms such as methyl, propyl, isobu-tyl, n-hexyl, etc. Polymer can also be made according to a process utilizing a p-dihalobenzene and an alkali metal sulfide, an organic amide, and an alkali metal carboxylate as in U.S. Patent 3,919~177.
Suitable polyamines to be used as the cleaning agent should exhibit some solubility for the particular poly(arylene sulfid~) polymer being removed. Such polyamine should preferably have a boiling point greater than about 200C as their use a-t such a temperature has exhibited enhanced cleaning results.
In carrying out the process of -the presen-t invention, the metal surfaces to be cleaned are contacted with the polyamine cleaning solution in any suitable manner and heated at a temperature and for a time sufficient to effect removal of the deposits for the metal surface.
Generally, the metal surfaces should be contacted wi-th the polyamine solution a-t a temperature above about 200C and preferably above about 250C for a period of time from about 0.5 hours to about 24 hours.
The cleaned metal surfaces are then removed from the bath and contacted with any solvent, such as methanol, which will remove any polyamine remaining on the surface o:E the metal. Then the me-tal surfaces are contacted with water, dried, and treated with concentrated HNO3 to remove any remaining contaminants on the metal surface.
In order to provide a clearer understanding of the present invention, but without limiting the scope -thereof, -the following examples are presented.
Example I
Poly(phenylene sulfide) (PPS) having a mel-t flow between 200 and 400 as measured at 315C/5Kg (ASTM D-123S, Modified Procedure B) was extruded at about 300C through a screen-pack comprised of ~ meta:L
screens (1.56 :inches diameter) ~0/80/200/Dynalloy X13L mesh s:ize placed on top of one another. After several hours extnlsion, the screens containing poly(phenylene sulfide) deposits were removed and immersed in 200 milliliters of triethylenetetramine and the solution heated at about 260DC for 6 hours. The screens were removed from the hot amine solution and soaked in methanol at 25C for 1 hour to remove the amine. The screens were then wa-ter soaked at 25C for 1 hour, air dried and trea-ted with concentratP HN03 for about 30 Minutes at 25C to remove any remaining deposits. Weighing the screen pack before and after cleaning revealed that flbout 85 weight percent of PPS-deposits were removed indicating good cleaning. Repeating the process at 200C and 280~C gave about 52 weight percent and 9~ weight percent 9 respectively of PPS-contaminants removal.
The process was repeated using a glycol and two hydroxy amines to detexmine their efficiency as a rleaner. None of the liquids te~ted were satisfactory in removing PPS-deposits rom metals. These results along with that of a commexcial cleaner are listed in Table I. The results from the triethylenetetramine cleaning ~re also listed for comparison.
Sonditions Run No. Cleaner ~C Hours Results 15 Controls:
1 Triethylene Glycol 250 4 No cleaning
2 Triethanolamine 250 6 No cleaning
3 Ethanolamine 170 6 No cleaning
4 Depoxy 125 4 No cleaning ~ Invention:
Triethylenetetramine 200 6 52~ removal 6 Triethylenetetramine 260 6 85% removal 7 Triethylenetetramine 280 2 99Z removal aCommercial cleaner from Atomergic Chemetals Corp., Plainville9 NY; 90Z
dimethylsulfoxide, 7~ HN03, 3~ stabilizers and accelerators.
Example II
Poly(phenylene sulfide) (PPS) as described in Example I was extruded at about 300C through a filter cartridge commonlv used in fiber spinning operations. This filter cartr;dge identified as Dynalloy X13L
consisted of a 7.5 inches x 1.55 inches O.D. cylinder with an inner and outer stainless steel support screen (equivalent to about a 40 mesh size) and an inner fine filter stainless steel mat (46 micron filter rating).
After several hours operation, the filter eartridge was removed, soaked in triethylenetetramine at 250C for 16 hours and further cleaned by soaking them in methanol at 25C for 1 hour. The metal surfaces were then soaked in watex at 25C for 1 hour, air dried! and treated with concentrated HN03 for about 30 minutes at 25C. By this method, greater * Trade Mark s ~ 5~
than ~5 percent of residual PPS-deposits was removed froln the cartridge Eilter indicating good cleaning. This example illus~rates the use:Eulness of the instant invention in cleaning other type metal filter screen systems.
Triethylenetetramine 200 6 52~ removal 6 Triethylenetetramine 260 6 85% removal 7 Triethylenetetramine 280 2 99Z removal aCommercial cleaner from Atomergic Chemetals Corp., Plainville9 NY; 90Z
dimethylsulfoxide, 7~ HN03, 3~ stabilizers and accelerators.
Example II
Poly(phenylene sulfide) (PPS) as described in Example I was extruded at about 300C through a filter cartridge commonlv used in fiber spinning operations. This filter cartr;dge identified as Dynalloy X13L
consisted of a 7.5 inches x 1.55 inches O.D. cylinder with an inner and outer stainless steel support screen (equivalent to about a 40 mesh size) and an inner fine filter stainless steel mat (46 micron filter rating).
After several hours operation, the filter eartridge was removed, soaked in triethylenetetramine at 250C for 16 hours and further cleaned by soaking them in methanol at 25C for 1 hour. The metal surfaces were then soaked in watex at 25C for 1 hour, air dried! and treated with concentrated HN03 for about 30 minutes at 25C. By this method, greater * Trade Mark s ~ 5~
than ~5 percent of residual PPS-deposits was removed froln the cartridge Eilter indicating good cleaning. This example illus~rates the use:Eulness of the instant invention in cleaning other type metal filter screen systems.
Claims (9)
1. A process for removing deposits on metal surfaces derived from poly(arylene sulfide) compound comprising contacting said metal surface with at least one polyamine compound represented by the general formula wherein R1 and R2 can be hydrogen or any alkyl radical having from 1 to 10 carton atoms; R3 can be hydrogen or any alkyl radical having 1 to 6 carbon atoms; x can be 1, 2, or 3, and n can be any integer from 1 to 4, at a temperature and for a time sufficient to remove said deposits from the surface of said metal.
2. A process according to claim 1 wherein said metal surface is further treated by contacting the resulting metal surface with methanol and then water; b) drying said metal surface; and c) contacting said metal surface with concentrated HNO3.
3. A process according to claim 1 wherein said polyamine compound is triethylenetetramine.
4. A process according to claim 1 wherein said poly(arylene sulfide) compound is poly(phenylene sulfide).
5. A process for removing deposits on metal surfaces derived from poly(arylene sulfide) compound comprising contacting said metal surface with at least one polyamine compound represented by the general formula wherein R1 and R2 can be hydrogen or any alkyl radical having from 1 to 10 carton atoms; R3 can be hydrogen or any alkyl radical having 1 to 6 carbon atoms; x can be 1, 2, or 3, and n can be any integer from 1 to 4, at a temperature above about 200°C for about 0.5 hours to 24 hours.
6. A process according to claim 5 wherein said metal surface is further treated by contacting the resulting metal surface with methanol and then water; b) drying said metal surface; and c) contacting said metal surface with concentrated HNO3.
7. A process according to claim 5 at a temperature above about 250°C.
8. A process according to claim 5 wherein said polyamine compound is triethylenetetramine.
9. A process according to claim 5 wherein said poly(arylene sulfide) compound is poly(phenylene sulfide).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000436755A CA1195219A (en) | 1983-09-15 | 1983-09-15 | Process for cleaning metal surfaces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000436755A CA1195219A (en) | 1983-09-15 | 1983-09-15 | Process for cleaning metal surfaces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1195219A true CA1195219A (en) | 1985-10-15 |
Family
ID=4126076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000436755A Expired CA1195219A (en) | 1983-09-15 | 1983-09-15 | Process for cleaning metal surfaces |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1195219A (en) |
-
1983
- 1983-09-15 CA CA000436755A patent/CA1195219A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 20030915 |