2.3 Experimental process
For the typical alkylation process, the reaction took place in a batch
reactor with 1 L volume equipped with a cooling system. At first, the
180 ml DESs/H2SO4 mixture was put into
the reactor, in which the ratio of DESs to
H2SO4 was set to be 0.5, 1.0, 3.0, 5.0
and 8.0 wt%, respectively. Subsequently, the N2 gas was
added to purge the reactor by three times to remove the air, after which
the cooling system turned on to keep reaction temperature at the given
temperature. The pressure in the reactor was controlled at 0.5 MPa to
maintain the C4 reactants as liquid phase. Then, 120 mL of
isobutane/2-butene mixture with a given ratio were quickly injected into
the reactor and the agitation started to work at the stirring rate of
3000 rpm to achieve a well-distributed dispersion between C4 reactants
phase and acid phase. After the reaction stopped, the products were
collected and analyzed by GC after being extracted and separated from
acid phase using carbon tetrachloride. The details of the analysis of
the products displayed on our previous work18.