Pitch, Ashland

Figure 7 presents an experimentally constructed transformation diagram for Ashland A240 pitch. Ashland A240 (low S) pitch was pyrolysed in a stirred vessel at a heating rate of 0.1 K min-. The values of T0 and Tg of residues extracted from the pyrolysis vessel at different times were determined as outlined elsewhere(32,33,35). 

The phenomena of coalescence, disclination reactions, and deformation response illustrated by film frame sequences in Figures 13-15 and 17 were observed on a petroleum pitch (Ashland A240) that had been thermally treated to reduce the evolution of volatiles. At observation temperatures near 440°C, the phenomena occurred at rates convenient for filming and for identifying disclination signs by rotating the plane of polarization. 

Ashland A200 petroleum pitch. Ashland A170 pitch coke (green). 

Two thousand pounds of Portage No. 515 sand, AFS number 68 are charged to a batch muller. Forty pounds of pitch (Ashland Chemical Co. O grade) are thoroughly mixed with the sand over a period of three minutes. Twenty pounds of Cab-O-Sil M-5 pyrogenic silica powder, as a thick paste with 80 pounds of water, and 40 pounds of Du Font s Elvace 1873, a 55% aqueous dispersion of polyvinyl acetate/ethylene copolymer (13% ethylene) are then added to the mulled mixture over a period of two minutes. One hundred six pounds of Du Pont No. 20 sodium silicate are then added and the mixing continued for an additional two minutes. Half a... 

Property Ashland 240 Petroleum pitch Ashland Aerocarb 60 Treated petroleum pitch Ashland Aerocarb 75 Treated petroleum pitch... 

Singer [22] developed a process for converting 50% of low-cost Ashland 240 isotropic pitch to mesophase by heating the pitch to 400-410°C for approximately 40 hours. During this "heat-soak," mesophase tended to collect at the bottom of the vessel, due to its greater density. The production of highly-oriented, graphitizable... 

Grint, A. Swietlik, U. Marsh, H. Carbonization and Liquid-crystal (Mesophase) Development-9. The Co-carbonization of Vitralns with Ashland A200 Petroleum Pitch. Fuel, 1979, M,... 

Figure 8. The gel chromatogram for Ashland A240 pitch and the toluene soluble (TS) fraction.

Monsanto Gelva S 55L 55 w/o polyvinyl acetate. Ashland Chemical O Pitch powder. 

The sand mix is prepared in the following way 16 grams of O Pitch sold by Ashland Chemical Company of Columbus, Ohio are added to 800 grams of Portage 515 sand supplied by Martin Marietta Aggregates of Rukton, lU., in a Kitchen-Aid Hobart K-45 mixer while... 

The isotropic pitch has to be treated to generate a product suitable for melt spinning, with a low volatility and filtered to remove solid particles. A good starting material would be Ashland 240, which has low quinoline content. The volatile components can be effectively removed with a wiped film evaporator [222], where a thin film of the molten pitch in the... 

Figure 4.29 The dependency of viscosity on temperature for several isotropic pitches, a mesophase pitch and a typical thermoplastic polymer Ashland 240 (isotropic petroleum pitch) Aerocarb 60 (isotropic pitch distilled from A240) Aerocarb 75 (isotropic pitch distilled from A240) Source. Sumner MB, Thermal properties of heavy isotropic petroleum pitches. Carbon 88, Proceedings of the International Conference on Carbon, University of Newcastle upon Tyne, 52-54, Sep 18-23,1988, Mesophase (produced by pyrolysis of A240) Nylon 6 (a typical melt spur synthetic polymer). Source Reprinted from Whitehouse S, Rand B, Rheology of mesophase pitch from A240. Carbon 88, Proceedings of the International Conference on Carbon, University of Newcastle upon Tyne, 175-176, Sep 18-23, 1988.

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