Process and apparatus for the purification of commercially avail

Details Process and apparatus for the purification of commercially avail Process and apparatus for the purification of commercially avail

1999-04-29

2000-02-22

Killos, Paul J.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

B60C 100, B60C 902

Patent

active

060268808

ABSTRACT:
A process for the purification of crude N,N'-diphenyl-p-phenylenediamine (DPPD), which comprises extracting crude DPPD with a hydrocarbon or hydrocarbon mixtures thereby forming an extract solution containing DPPD, passing the extract solution over an adsorption layer, and recovering purified DPPD from the solution.

REFERENCES:
patent: 2744938 (1956-05-01), Urban, Jr.
patent: 2833824 (1958-05-01), Pecherer
patent: 4946977 (1990-08-01), Bernhardt et al.
patent: 5763666 (1998-06-01), Frings et al.
Mustafa Al-Jarrah et al. J. Pet Res. (1988) 7(2) 73-86.
Chakravarty, S et al Rubber News (1974) 14(1) 22-7.

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