GB873607A - Improvements in or relating to processes for production of low permeability carbon - Google Patents
Improvements in or relating to processes for production of low permeability carbonInfo
- Publication number
- GB873607A GB873607A GB2000658A GB2000658A GB873607A GB 873607 A GB873607 A GB 873607A GB 2000658 A GB2000658 A GB 2000658A GB 2000658 A GB2000658 A GB 2000658A GB 873607 A GB873607 A GB 873607A
- Authority
- GB
- United Kingdom
- Prior art keywords
- article
- furfural
- nitrogen
- permeability
- calcined
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained by impregnation of carbon products with a carbonisable material
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
Abstract
The permeability of a carbon or graphite article, e.g. a tube, is decreased by impregnating with furfural and successively polymerizing and carbonising the furfural under pressure and heat in the absence of a catalyst. The furfural may be admixed with furfuryl alcohol, or may contain cellulose acetate, ethyl cellulose, or pitch. The article may be first evacuated and then impregnated in a nitrogen atmsphere. The nitrogen pressure may then be raised to 800-1100 p.s.i. and the temperature to 305-310 DEG C. to polymerize and carbonise the furfural. The treated article may be calcined at a temperature of 1000 DEG C. at atmospheric pressure in air surrounded by graphite powder or nitrogen, or in a vacuum. The treated article may be graphitised by heating to 2800 DEG C. The successive steps of impregnation, polymerization, and carbonisation may be repeated a number of times. The permeability of the calcined article may be 9.3 X 10-7 darcys and its bulk density 1.93 gm. Examples are given.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2000658A GB873607A (en) | 1958-06-23 | 1958-06-23 | Improvements in or relating to processes for production of low permeability carbon |
| ES0250288A ES250288A1 (en) | 1958-06-23 | 1959-06-22 | Improvements in or relating to processes for production of low permeability carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2000658A GB873607A (en) | 1958-06-23 | 1958-06-23 | Improvements in or relating to processes for production of low permeability carbon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB873607A true GB873607A (en) | 1961-07-26 |
Family
ID=10138788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2000658A Expired GB873607A (en) | 1958-06-23 | 1958-06-23 | Improvements in or relating to processes for production of low permeability carbon |
Country Status (2)
| Country | Link |
|---|---|
| ES (1) | ES250288A1 (en) |
| GB (1) | GB873607A (en) |
-
1958
- 1958-06-23 GB GB2000658A patent/GB873607A/en not_active Expired
-
1959
- 1959-06-22 ES ES0250288A patent/ES250288A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES250288A1 (en) | 1959-12-16 |
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