Lipopeptides were eluted by a component solvent system that solvent A was acetonitrile and solvent B was water, both injected with 0.1 % formic acid for facilitating protonation of the basic nitrogen compounds yielding protonated molecules [M + H]+.
The yield of heavy oil decreased from 19.26 to 14.07 % after removing the basic nitrogen compounds, and then dramatically reduced to 6.42 % after removing both basic nitrogen, non-basic nitrogen and condensed aromatic compounds.
And the basic nitrogen compounds in shale oil included N1, N1O1, N1O2, N2 and N2O1 species.
In broad terms, the transformations' effects are straightforward; for example, the removal of the basic nitrogen or the manipulation of the pKa of the basic nitrogen environment by addition or removal of nearby alkyl groups.
Second, since their big size and aromatic nature, the basic nitrogen compounds may be the precursors of coke.
And sample B-extract which is the basic nitrogen compounds extracted by HCl centers at 240 m/z.
The presence of an alcohol or ether in β-position to the basic nitrogen often gives better enantioselectivities. Solvent.
The basic nitrogen refers to nitrogen compounds which can be titrated by perchloric acid in acetic acid and benzene sample solutions.
First, the basic nitrogen compounds reversibly absorb on the Brønsted or Lewis acid centers and then poison the acid centers, thus weaken other hydrocarbons cracking ability.
As can be seen from Fig. 3 after removing the basic nitrogen compounds, the yield of LPG did not change sensibly but the yield of gasoline increased dramatically.
