Enriching off gas from oil shale retort

摘要: Liquid and gaseous products are recovered from oil shale in an situ retort which a combustion zone is advanced therethrough by method includes the steps of establishing introducing feed mixture into direction to be through retort. The comprises oxygen supplying gas water vapor introduced at rate sufficient maintain temperature within predetermined range temperatures above retorting advance introduction generates gases together with portion does not take part process, called flue gas. passes on advancing side zone, thereby produce liquid products. product off gas, withdrawn point zone.