| 摘要 |
A method for a vaporizing heavy hydrocarbon which avoids the formation of coke in the feed heaters and is useful in a process for upgrading and/or converting the heavy hydrocarbon to lighter products. Heavy hydrocarbon feedstock (10) is heated (12) to a temperature below its coking point, then mixed (at 20) with hydrogen (16) heated (at 18) to a temperature sufficient so that the hydrocarbon feedstock is vaporized without forming coke. Alternatively, the heavy hydrocarbon feedstock can be fractionated to provide a light IBP-550 DEG F (288 DEG C) liquid fraction, and a heavy 550-850 DEG F (288-454 DEG C) liquid fraction. The light fraction is mixed with hydrogen and heated to a temperature sufficiently high, so that upon being mixed with the heavy liquid fraction the latter is heated through its dry point and vaporized without coking. The resulting vaporized hydrocarbon is usually further heated before being fed to a reaction step, such as hydrodealkylation. |
