while the aqueous layer was collected and concentrated by the vacuum condenser under the negative pressure of 0.08–0.1 MPa until the solid content reaching 30%. The concentrated CBE was stored at 20 C until further use.
whilethe aqueous layer was collected and concentrated by the vacuumcondenser under the negative pressure of 0.08–0.1 MPa until thesolid content reaching 30%. The concentrated CBE was stored at20 C until further use.