EP 0957150 A1 19991117 - Tar and/or oil pitch with a low content of polycyclic aromatic substances and a method for the preparation thereof
Title (en)
Tar and/or oil pitch with a low content of polycyclic aromatic substances and a method for the preparation thereof
Title (de)
Teer- und/oder Ölpech mit geringem Gehalt an polycyclischen aromatischen Stoffen und dessen Herstellung
Title (fr)
Goudron et/ou huile de brai ayant une faible teneur à des substances aromatiques polycycliques et procédé de préparation
Publication
Application
Priority
EP 98830298 A 19980515
Abstract (en)
A tar and/or oil pitch has a low content of polycyclic aromatic substances and is characterized in that it has a benzoÄaÜpyrene content less than or equal to 5 ppm, and in that it has optical anisotropy of less than 1%; it is prepared by means of a method in which a residue with a low softening point from the primary distillation of tar and/or petroleum or a mixture of the residue with tar and/or petroleum is distilled with continuous mixing in an evaporator having a heat-exchange area:volume ratio of between 1 m<2>/m<3> and 200 m<2>/m<3>, at a pressure less than or equal to 10 mbars, and at a temperature of between 250 DEG C and 360 DEG C, for a period of at least 20 minutes; the pitch according to the invention is particularly suitable for use as a binding agent in the production of electrodes, refractory materials or special graphitized materials, as an impregnating agent, and as a raw material for the production of paints, pitch coke and rechargeable batteries. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
Citation (search report)
- [DA] EP 0510315 A1 19921028 - RUETGERSWERKE AG [DE]
- [A] US 5746906 A 19980505 - MCHENRY E RONALD [US], et al
- [A] US 5121992 A 19920616 - LIST JOERG M [CH], et al
- [A] DATABASE WPI Section Ch Week 7910, Derwent World Patents Index; Class HO9, AN 79-19202B, XP002081348
Designated contracting state (EPC)
BE CH DE DK ES FR GB IT LI NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 98830298 A 19980515