Verfahren zur Vorreinigung von beim Kracken von Kohlenwasserstoffen anfallenden acetylenhaltigen Gasen zur Erzeugung von hochprozentigem Acetylen

摘要

Acetylene-containing gases obtained by cracking hydrocarbons are purified prior to solvent extraction by contact with 70-98% sulphuric acid at 25-40 DEG C. and a pressure such that the ethylene partial pressure is 0.5-1.4 atm. In a preferred embodiment the gas containing 5-15% vol. of acetylene at 5-24 atm. is contacted in a first stage at 25-40 DEG C. and atmospheric pressure with 40-90% acid (70-90% on entering) obtained from the subsequent main washing, contacting with aqueous alkali, compressing and contacting with 70-98% acid (90-98% on entering) in accordance with the invention, again contacting with alkali and passing to a solvent extraction process.