Abstract:
A process for purifying at least one product from coal tar is described. The process involves separating a coal tar fraction having a boiling point in the range of 180°C to 230°C into an acidic portion and a non-acidic portion by contacting the fraction with a caustic compound. The acidic portion is separated into a cresol portion and a xylenol portion, and the non-acidic portion is separated into a naphthalene portion and a naphthalene co-boiler portion. The acidic portion and the non-acidic portions are separated by contacting with an adsorbent comprising small, discrete crystallites, the adsorbent having less than 10 wt% amorphous binder component. The various portions can be separated in a similar manner.
Abstract:
Disclosed is a process for producing mesophase pitch by hydrogenation of high-temperature coal tar, comprising removing salts and quinoline insolubles from the high-temperature coal tar to obtain a clear oil; using the clear oil as a hydrogenation feed oil, or pre-distilling the clear oil to obtain a bottom component with a boiling point higher than 230°C and formulating the bottom component into a hydrogenation feed oil; refining the hydrogenation feed oil by catalytic hydrogenation to obtain a refined hydrogenated oil; distilling the refined hydrogenated oil to obtain hydrogenated pitch; subjecting the hydrogenated pitch to thermal condensation polymerisation to obtain the mesophase pitch. The process has features such as an easily controllable degree of hydrogenation, complete removal of impurities, good raw material flowability, not being susceptible to carbon deposition and coking during the process, and not tending to block the reactor. The product has a high mesophase content, a low softening point and a low impurity content.
Abstract:
Anthracene is precipitated in improved purity and yield by cooling a creosote coal tar distillation fraction. A ketone such as acetone is added to the fraction before the anthracene precipitates. The ketone retains phenanthrene and/or carbazole in the liquid phase as the anthracene precipitates. If the ketone is then removed, the phenanthrene and/or carbazole precipitates and can also be purified.
Abstract:
A process for treating a pitch fraction from coal tar is described. The pitch fraction is contacted with a solvent, an extraction agent, or an adsorbent to remove at least one contaminant, such as oxygenate compounds, nitrogen containing compounds, and sulfur containing compounds. The solvent can be an ionic liquid, the extraction agent can be at least one of amphiphilic block copolymers, cyclodextrins, functionalized cyclodextrins, and cyclodextrin-functionalized polymers, and the adsorbent can be exfoliated graphite oxide, thermally exfoliated graphite oxide or intercalated graphite compounds.
Abstract:
A process for removing at least one contaminant from coal tar is described. The process involves extraction with an extraction agent or adsorption with an adsorbent. The extraction agent includes at least one of amphiphilic block copolymers, inclusion complexes of poly(methyl methacrylate) and polycyclic aromatic hydrocarbons, cyclodextrins, functionalized cyclodextrins, and cyclodextrin-functionalized polymers, and the adsorbent includes exfoliated graphite oxide, thermally exfoliated graphite oxide or intercalated graphite compounds.
Abstract:
콜타르계 원료 물질, 제1 용매 및 제2 용매를 혼합하여 혼합물을 준비하는 단계; 상기 혼합물에서 원심분리법 또는 디칸팅(decanting)법으로 불용분이 포함되지 않은 상등액 부분과 불용분이 포함된 슬러지 부분을 분리하는 단계; 및 불용분이 포함되지 않은 상등액 부분을 280℃ 이하의 온도에서 감압 증류를 통해 제1 용매 및 제2 용매를 제거하고 고순도 피치를 얻는 단계;를 포함하는 고효율의 탄소 소재 원료용 고순도 피치의 제조 방법을 제공하고, 상기 제1 용매는 베타-레진과 퀴놀린 불용분에 대해 응집성을 갖는 적어도 한 개의 치환기를 갖는 단일환 방향족 화합물의 단일 용매이고, 상기 제2 용매는 베타-레진과 피치에 대해 용해성을 갖는 방향족 화합물이다.