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    • 5. 发明授权
    • Delayed coking process
    • 延迟焦化工艺
    • US4661241A
    • 1987-04-28
    • US718328
    • 1985-04-01
    • Michael J. DabkowskiMadhava Malladi
    • Michael J. DabkowskiMadhava Malladi
    • C10B55/00C10B57/06C10G9/02C10G9/14
    • C10G9/02C10B55/00C10B57/06
    • A delayed coking process having improved liquid yield and liquid product distribution relative to coke yield is characterized by the absence of heavy recycle. The coker feedstock is heated in the coker furnace and led to the coker drums where coking takes place and the vaporous effluence are passed to a fractionator from which the heavy gas oil fraction is removed as product. Process heat is conserved by indirect heat exchange of the feedstock with the coking products prior to the feedstock entering the coking furnace. A further improvement in liquid yield and selectivity is obtained by adding a solvent or diluent to the feedstock and this may be either a hydrocarbon fraction such as a coker distillate, a light gas oil or another fraction having an end point below 450.degree. C.; in addition, it may be used in conjunction with a reactive or nonreactive gas such as nitrogen, steam, hydrogen or hydrogen sulfide.
    • 具有改善的液体产率和相对于焦炭产量的液体产物分布的延迟焦化方法的特征在于不存在重的循环。 焦化器原料在焦化炉中加热并导致焦化鼓,焦化鼓发生焦化并将蒸汽流出物送入分馏塔,重质瓦斯油馏分作为产物除去。 在原料进入焦化炉之前,通过原料与焦化产物的间接热交换来保护工艺热。 通过向原料中加入溶剂或稀释剂可获得液体产率和选择性的进一步改善,并且其可以是烃馏分如焦化馏分,轻瓦斯油或终点低于450℃的另一部分。 此外,其可以与反应性或非反应性气体如氮气,蒸汽,氢气或硫化氢结合使用。