TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The reaction step (S1) involves reactor system, where partly two distinct reaction phases are present. In the first part of the reaction step (S1), olefin, and/or corresponding aldehydes, ketones and alcohols, oligomcrization by-product formation is prevented by the combination of two separate liquid phases of olefin and glycerol, and homogeneous catalyst that is insoluble in the olefin phase. In the later part of the reaction step (S2), when the concentration of ethers is increased and the concentration of olefin is decreased, only one phase is observed, in which the etherification reaction rate is relatively high. The neutralization and salt removal step (S2) prevents the salt build-up in the process via the glycerol and/or mono-ether recycles. In the process, the reaction unit consists of plug flow reactor (PFR) or cascade of several continuous stirred tank reactors (CSTR's) operating at 40-180 (preferably 60-90) degrees C; the process pressures in the various process steps are of 1-100 (preferably 3-50) atmosphere; the treated or untreated glycerol containing certain salt level is used; the olefinic hydrocarbon and glycerol is applied in mole ratio of 0.1:1 to 10:1 (preferably 0.1:1 to 10:1); the acid catalyst (0.1-10 wt.%) is neutralized by potassium hydroxide solution, or organic and/or inorganic bases. The process involves creating two-phase system, where the first phase is polar glycerol phase including homogeneous acid catalyst, and non-polar olefin phase including the chosen olefin, and/or the corresponding aldehydes, ketones and alcohols, where the reaction conditions favors the reaction between the glycerol and olefin and/or the corresponding aldehydes, ketones and alcohols over the oligomerization of the olefin, and/or the corresponding aldehydes, ketones and alcohols allowing the process to proceed; neutralizing the polar phase; and recovering the resulting glyceryl ether. The first phase is neutralized and the salt separated after completion of the process, where the first phase is derived from transesterification process. Preferred Components: The homogeneous acid catalyst (preferably sulfuric acid, para-toluenesulfonic acid, methanesulfonic acid) (0.1-10, preferably 0.5-6) wt.%, is soluble in the glycerol polar phase and nearly insoluble in the non-polar olefin phase. The olefinic hydrocarbon used for glycerol etherification is isobutylene. The olefin is isobutylene. EXAMPLE - No suitable example given.