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公开(公告)号：US5262043A
公开(公告)日：1993-11-16
申请号：US869936
申请日：1992-04-17
摘要： 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).
摘要翻译： 具有低含量致癌化合物的各向同性煤焦油沥青通过在具有330至10,000m 2 / m 3的特定蒸发器表面的蒸发器中蒸馏煤焦油沥青而制备，温度范围为300-380℃ C.在不超过1毫巴的压力下，平均逗留时间为2至10分钟。 由此获得的各向同性沥青包含少于50ppm的苯并[a]芘，并且任选地在加入具有低苯并[a]芘含量的油，树脂或其它改性剂之后，适合用作结合和浸渍剂，并且还 作为建筑材料中的保护剂或清漆（涂漆剂）。
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公开(公告)号：US5283045A
公开(公告)日：1994-02-01
申请号：US004248
申请日：1993-01-14
CPC分类号： C10C1/00 , C04B35/528
摘要： A carbon powder is disclosed with 40 to 75% by weight QI or more than 90% by weight TI, an optical anisotropy of less than 50% by volume, a start of softening between 200.degree. and 300.degree. C., and an oxygen content of more than 2% by weight, and which can be used for without binding agent the production of shaped carbon bodies. The carbon powder is produced by means of distillation from bituminous product at a maximum of 5 mbars and a final temperature of at least 400.degree. C., grinding of the distillation residue to a particle size of less than 30 .mu.m, and oxidation of the powder into the particle core.
摘要翻译： 公开了一种碳粉，其具有40至75重量％的QI或大于90重量％的TI，光学各向异性小于50体积％，软化开始在200摄氏度至300摄氏度之间，氧含量 超过2重量％，可用于无粘结剂生产成型碳体。 碳粉通过最大5m巴的沥青产物蒸馏生成，最终温度至少为400摄氏度，蒸馏残渣研磨至小于30（m）的粒度，氧化 的粉末进入颗粒核心。
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