| 词条 | De-asphalter |
| 释义 |
A de-asphalter is a unit in a crude oil refinery or bitumen upgrader that separates asphalt from crude oil or bitumen. The de-asphalter unit is usually placed after the vacuum distillation tower. It is usually a solvent de-asphalter unit, SDA. The SDA separates the asphalt from the feedstock because light hydrocarbons will dissolve aliphatic compounds but not asphaltenes. The output from the de-asphalter unit is de-asphalted oil ("DAO") and asphalt. DAO from propane de-asphalting has the highest quality but lowest yield, whereas using pentane may double or triple the yield from a heavy feed, but at the expense of contamination by metals and carbon residues that shorten the life of downstream cracking catalysts.[1] If the solvent is butane the unit will be referred to as a butane de-asphalter ("BDA") and if the solvent is propane, it will be called a propane de-asphalter ("PDA") unit. References
1. ^{{cite book |author=John J. McKetta |title=Petroleum Processing Handbook |publisher=CRC Press |year=1992 |isbn=978-0-8247-8681-6 |page=536 |url=https://books.google.com/books?id=Xlqsr_K59mcC&pg=PP1&dq=McKetta,+John+J.+Petroleum+Processing+Handbook.}} External links
3 : Chemical equipment|Distillation|Petroleum technology |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。