US2022378A - Metal digester having a corrosion resistant metal lining - Google Patents
Metal digester having a corrosion resistant metal lining Download PDFInfo
- Publication number
- US2022378A US2022378A US20608A US2060835A US2022378A US 2022378 A US2022378 A US 2022378A US 20608 A US20608 A US 20608A US 2060835 A US2060835 A US 2060835A US 2022378 A US2022378 A US 2022378A
- Authority
- US
- United States
- Prior art keywords
- metal
- digester
- lining
- corrosion resistant
- coating
- 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 - Lifetime
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/04—Linings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S220/00—Receptacles
- Y10S220/917—Corrosion resistant container
Definitions
- cadmium which in addition to its own properties as a protecting agent forms a layer of yellow cadmium sulfide which further acts as with the cooking liquor a protective coating.
- One great advantage of the improved metal coating is that it can be applied in situ by the use of known means as for example a so-called pistol which operates.
- metal to be sprayed into by feeding a wire of the a flame produced by concurrent streams of a combustible gas and oxygen, the liquefied metal being atomized by a stream of air or non-oxidizing gas.
- the interior steel surface of the digester is suitably roughened with steel grit or by s the metal is sprayed in the coating has been applied, the same is preferably gone over with a to close up any porous renders the same bright ness of the coating ma preferably by scrubbing and blasting, whereupon known manner.
- wire brush which tends spots on the surface and and smooth. The thicky vary from .005 to .040
- a second coating of the same or a different metal may be sprayed over the first one.
- A. sulfite pulp digester composed of a steel shell and having a firmly adherent, impervious, sprayed lining of a corrosion resisting metal.
- a sulfite pulp digester composed of a steel firmly adherent, impervious, metal composed of at least ,one of the following. corrosion resisting metals: cadmium, Monel, stainless steel, tin, lead and bronze.
- a sulfite pulp digester composed of a steel shell having a protective interior coating of sprayed cadmium.
- a monosulfite pulp digester composed of a steel shell and having a firmly adherent, impervious, sprayed lining of a metal composed of at least one of the following corros'on resisting metals: cadmium, Monel, stainless steel, tin, lead and bronze.
- a sulfite pulp digester composed of a steel shell and having a firmly adherent, impervious, sprayed lining of a corrosion resisting metal, said digester being capable of resisting the corrosive effects of the acid cooking liquors.
- a sulfite pulp digester composed of a steel shell having a protective interior coating of sprayed cadmium of from .005 to .040 inch thick-
Landscapes
- Paper (AREA)
Description
UNITED STATES PATENT OFFICE Our present invention gesters used in the those employed in the 2.022.378 METAL DIGESTER HAVING A CORROSION RESISTANT METAL LINING Paul B. Lacy, Edwin F. Libby, and Ralph V.
Covington, Va., assignors' to Metz, Industrial Chemical Sales Company, Inc., New York, N. Y., a corporation of New York No Drawing. Application Serial No.
6 Claims. relates to linings for dipulp industry particularly so-called monosulfite proc- In this process the wood or other cellulosic material is cooked with a' liquor consisting of a we have found cadmium, Monel,
bronzes to give a coating of tin, lead and various the desired properties.
Of these metals we prefer cadmium which in addition to its own properties as a protecting agent forms a layer of yellow cadmium sulfide which further acts as with the cooking liquor a protective coating.
One great advantage of the improved metal coating is that it can be applied in situ by the use of known means as for example a so-called pistol which operates. metal to be sprayed into by feeding a wire of the a flame produced by concurrent streams of a combustible gas and oxygen, the liquefied metal being atomized by a stream of air or non-oxidizing gas.
sprayed, the interior steel surface of the digester is suitably roughened with steel grit or by s the metal is sprayed in the coating has been applied, the same is preferably gone over with a to close up any porous renders the same bright ness of the coating ma preferably by scrubbing and blasting, whereupon known manner. After wire brush which tends spots on the surface and and smooth. The thicky vary from .005 to .040
Before the coating is May 9, 1935, 20,608
inch. If desired, a second coating of the same or a different metal may be sprayed over the first one.
While of particular utility for monosulfite digesters, the improved coating especially of cadmium, is also useful for ordinary acid sulfite cooks, i. e. using sodium or calcium or other sulfite salt with an excess of sulphurous acid. Accordingly, in the claims by sulfite pulp digester we intend to include those used both for monosulfite liquors and acid'sulfite liquors.
We claim:
1. A. sulfite pulp digester composed of a steel shell and having a firmly adherent, impervious, sprayed lining of a corrosion resisting metal.
2. A sulfite pulp digester composed of a steel firmly adherent, impervious, metal composed of at least ,one of the following. corrosion resisting metals: cadmium, Monel, stainless steel, tin, lead and bronze.
3. A sulfite pulp digester composed of a steel shell having a protective interior coating of sprayed cadmium.
4. A monosulfite pulp digester composed of a steel shell and having a firmly adherent, impervious, sprayed lining of a metal composed of at least one of the following corros'on resisting metals: cadmium, Monel, stainless steel, tin, lead and bronze. 3
5. A sulfite pulp digester composed of a steel shell and having a firmly adherent, impervious, sprayed lining of a corrosion resisting metal, said digester being capable of resisting the corrosive effects of the acid cooking liquors.
6. A sulfite pulp digester composed of a steel shell having a protective interior coating of sprayed cadmium of from .005 to .040 inch thick-
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20608A US2022378A (en) | 1935-05-09 | 1935-05-09 | Metal digester having a corrosion resistant metal lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20608A US2022378A (en) | 1935-05-09 | 1935-05-09 | Metal digester having a corrosion resistant metal lining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2022378A true US2022378A (en) | 1935-11-26 |
Family
ID=21799569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US20608A Expired - Lifetime US2022378A (en) | 1935-05-09 | 1935-05-09 | Metal digester having a corrosion resistant metal lining |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2022378A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5503711A (en) * | 1994-06-14 | 1996-04-02 | Salminen; Reijo | Method of rehabilitating a wood pulp digester |
-
1935
- 1935-05-09 US US20608A patent/US2022378A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5503711A (en) * | 1994-06-14 | 1996-04-02 | Salminen; Reijo | Method of rehabilitating a wood pulp digester |
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