Processes for the manufacture of enriched pitches and carbon fibers
US4996037A · kind A · utility
Inventors
Key dates
| Filing date | Mar 12, 1986 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Mar 12, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F9/155
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
There are provided improved processes for the manufacture of enriched pitches, carbon fiber precursors, carbon fibers, and graphite fibers. The improvement comprises employing an elevated wiped-film evaporator in a wiped-film evaporator system comprising the wiped-film evaporator and a means for recovering enriched pitch, such as a positive displacement pump, to form an enriched pitch from catalytic pitch and regulating the operating conditions of the wiped-film evaporator system to provide the desired enriched pitch. The wiped-film evaporator is located a specific distance above the means for recovering enriched pitch. The vertical distance between the outlet of the wiped-film evaporator and the inlet of the means for recovering enriched pitch is within the range of about 10 feet to about 40 feet, preferably about 20 feet to about 40 feet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.