Coal tar pitch and the preparation and use thereof

Details Coal tar pitch and the preparation and use thereof Coal tar pitch and the preparation and use thereof

1992-04-17

1993-11-16

Morris, Theodore

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

By distillation

208 44, 1062731, C10C 302, C10C 306, C08L 9500

Patent

active

052620433

ABSTRACT:
An isotropic coal tar pitch having a low content of carcinogenic compounds is prepared by distilling a coal tar pitch in an evaporator having a specific evaporator surface of from 330 to 10,000 m.sup.2 /m.sup.3, at a temperature in the range of from 300.degree. to 380.degree. C., under a pressure not exceeding 1 mbar, whereby the average stay period is from 2 to 10 minutes. The isotropic pitch thus obtained contains less that 50 ppm of benzo[a]pyrene and is suitable, optionally after adding an oil, resin or other modifying agents having a low benzo[a]pyrene content, for use as binding and impregnating agent and also as protecting agent in construction materials or as varnish (painting agent).

REFERENCES:
patent: 2066386 (1937-01-01), Bergeim
patent: 5128021 (1992-07-01), Romey et al.
Derwent Publications, Ltd. Abstract of SU-A-857 224 (Aug. 23, 1981).
Derwent Publications, Ltd. Abstract of JP-A-54 013 533 (Feb. 1, 1979).

Affiliated with

Also associated with

Rating

Coal tar pitch and the preparation and use thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coal tar pitch and the preparation and use thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coal tar pitch and the preparation and use thereof will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-20027