Pitch bonded carbon electrode

Details Pitch bonded carbon electrode Pitch bonded carbon electrode

Filed on

1977-04-18

Date issued

1978-04-25

Examiner

Edmundson, F.C.

Patent Class

Chemistry: electrical and wave energy

SubClass

Apparatus

SubSubClass

Electrolytic

Other Related Categories

208 41, 208 44, C25C 702, C10C 300, C10C 306

Type

Patent

Status

active

Patent number

040861562

Description

ABSTRACT:
This invention relates to the production of chemical pitch by stripping under reduced pressure steam cracker tar to obtain a pitch having an initial boiling point of between 350.degree. C and 400.degree. C at atmospheric pressure, heat soaking the pitch at 360.degree. to 420.degree. C in the absence of air or oxygen at sub-atmospheric to 4 atmospheres absolute and stripping under reduced pressure the soaked pitch to obtain a product having a minimum softening point (R and B) of 75.degree. C. This pitch can be mixed with coke to make electrodes especially suitable for aluminium production.

REFERENCES:
patent: 2848424 (1958-08-01), Stanko
patent: 3238116 (1966-03-01), Hamner et al.
patent: 3324029 (1967-06-01), King et al.
patent: 3725240 (1973-04-01), Baum
patent: 3970542 (1976-07-01), Bongertman
patent: 4017378 (1977-04-01), Fauveau et al.

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