A process for developing multi-component vapor mixture by heating of solution of reactants comprising one or more of diphenols, or diphenol derivatives, and an organic compound, wherein the organic compound is one which upon reacting in a vapor state in presence of a catalyst with diphenols, or diphenol derivatives, produces a monoalkyl ether of a dihydric phenolic compound, wherein the entire solution of reactants completely transforms into a super-heated multi-component vapor using heaters without the use of thin film evaporator, wherein the complete transformation of the entire solution of reactants in to super-heated multicomponent vapor is achieved by heating the entire solution firstly by a pre-heater followed by further heating by a super-heater, and the process comprising the steps of: a. mixing a diphenol or diphenol derivative selected from the group consisting of catechol, Hydroquinone, Resorcinol, 4-methyl catechol or 4-Chloro catechol with an aliphatic or alicyclic alcohol selected from the group consisting of Methanol, Ethanol, Isopropyl alcohol, Isobutyl alcohol, tert-butyl alcohol, n-butyl alcohol, isoamyl alcohol, Amyl alcohol, 2-Methyl butan-1-ol,Neopentyl alcohol,3-pentanol, Methyl propyl carbinol, Methyl propyl isocarbinol, Tertiary amyl alcohol, Cyclohexanol, Cyclopentanol, Cyclobutanol, and Cyclopropanol in a mixing vessel at about 40 to 100 °C, b. filtering out the un-dissolved component, c. analyzing the clear multi component liquid in feed tank and adjusting the same to desired composition by addition of required component, d. transferring the said liquid to pre-heater and to super-heater heated by a heating source to get the superheated mixed multi component vapors from top of the Jacketed vessel, e. removing, if some of the high boilers escape the process of super heating and condense, from the bottom of the jacketed vessel via "High Boilers to drain" so that only vapors are allowed to pass to next stage, f. allowing the superheated mixed multi component vapors to pass through a vertical externally heated (jacketed) section (c) through which hot oil goes in through the inlet and comes out through outlet, heating the heated section to ensure the complete evaporation of the high boiling component of the mixed multi component liquid, g. ensuring that the mixed multi component vapors have same composition as that of the multi-component liquid, and h. draining off the non evaporated portion of the mixed multi component liquid from the bottom of the heated section. a. mixing a diphenol or diphenol derivative selected from the group consisting of catechol, Hydroquinone, Resorcinol, 4-methyl catechol or 4-Chloro catechol with an aliphatic or alicyclic alcohol selected from the group consisting of Methanol, Ethanol, Isopropyl alcohol, Isobutyl alcohol, tert-butyl alcohol, n-butyl alcohol, isoamyl alcohol, Amyl alcohol, 2-Methyl butan-1-ol,Neopentyl alcohol,3-pentanol, Methyl propyl carbinol, Methyl propyl isocarbinol, Tertiary amyl alcohol, Cyclohexanol, Cyclopentanol, Cyclobutanol, and Cyclopropanol in a mixing vessel at about 40 to 100 °C, b. filtering out the un-dissolved component, c. analyzing the clear multi component liquid in feed tank and adjusting the same to desired composition by addition of required component, d. transferring the said liquid to pre-heater and to super-heater heated by a heating source to get the superheated mixed multi component vapors from top of the Jacketed vessel, e. removing, if some of the high boilers escape the process of super heating and condense, from the bottom of the jacketed vessel via "High Boilers to drain" so that only vapors are allowed to pass to next stage, f. allowing the superheated mixed multi component vapors to pass through a vertical externally heated (jacketed) section (c) through which hot oil goes in through the inlet and comes out through outlet, heating the heated section to ensure the complete evaporation of the high boiling component of the mixed multi component liquid, g. ensuring that the mixed multi component vapors have same composition as that of the multi-component liquid, and h. draining off the non evaporated portion of the mixed multi component liquid from the bottom of the heated section.