METHOD FOR SEPARATING AND ENRICHING LOWER DIAMONOID COMPOUNDS FROM PETROLEUM AND SOURCE ROCK

摘要

Disclosed is a method for separating and enriching lower diamondoid compounds from petroleum and source rock, which includes: extracting the source rock sample with a solution of dichloromethane and methanol to give a source rock extract; removing normal saturated hydrocarbons and asphaltic components from the source rock extract or a crude oil sample with ZSM-5 molecular sieve, obtaining isomeric saturated hydrocarbons components through silica-gel column; adding a solution of β-cyclodextrin into the solution of the isomeric saturated hydrocarbons, separating the mixed suspension to obtain a deposit, adding the deposit into a solution of hydrochloric acid, maintaining the temperature from 40 to 95℃ in an oven, cooling to room temperature after the hydrolysis of β-cyclodextrin catalyzed by an acid is completed, and extracting with a saturated hydrocarbon solvent to obtain lower diamondoid compounds. In this method, the rate of recovery of mono-diamondoid compounds is up to 18%, the rate of recovery of di-diamondoid compounds is up to 35%, and the rate of recovery of tri-diamondoid compounds is up to 1.5%.