납사분해공정 잔사유로부터 탄소재료용 전구체 핏치의 제조

Preparatoin of Precursor Pitch for Carbon Applications from Naphtha Cracking Residues

PFO(pyrolized fuel oil) and $C_{10}^{+}$ 수식 이미지 oil, which are the residual heavy oils form a NCC(naphtha cracking center), were heat-treated to produce the precursor-pitch for carbon materials. After PFO was initially distilled near $300^{\circ}C$ 수식 이미지 to separate the volatile matters recovering as high-quality fuel oil, the residuum of nonvolatile precursor-pitch was then thermally pyrolized in the temperature ranges from $350^{\circ}C$ 수식 이미지 to $450^{\circ}C$ 수식 이미지. Spinnable isotropic pitch with the softening point of $200^{\circ}C$ 수식 이미지 and the toluene insolubles of 36wt% was obtained at $365^{\circ}C$ 수식 이미지, and then was successfully spun through a spinneret(0.5mm diameter). After spinning, an isotropic carbon fiber of $25{\mu}m$ 수식 이미지 diameter was obtained via oxidation and craboniation procedures. Mesophase spherules began to be observed from the product pitch pyrolized at $400^{\circ}C$ 수식 이미지, and bulk mesophase with a flow texture was observed above $420^{\circ}C$ 수식 이미지. In the case of $C_{10}^{+}$ 수식 이미지 was the feed was polymerized in the presence $H_2SO_4$ 수식 이미지 at room temperature to increase the molecular weight and then heat-treated gradually up to $200{\sim}250^{\circ}C$ 수식 이미지. The products obtained with the softening point of $80{\sim}190^{\circ}C$ 수식 이미지 were carbonized at 500 and $1000^{\circ}C$ 수식 이미지 to examine the morphology.