for further use mtbe extraction of 6 acetyl tgs from aqueous mass was concentrated to remove the organic layer the tgs loss was monitored at various stages difference between concentration of 6 acetyl tgs with and without addition of carbonates in ethyl acetate extract and content of the same during concentration of mtbe extract are given in table 2 the table shows clearly that in the solvent with ester group such as in ethyl acetate addition of the carbonates for the control of ph is a must to prevent product deterioration whereas the mtbe extract doesn 39 t require any control of ph during concentration and the product deterioration is not seen reaction mixtures containing 6 acetyl tgs are prepared by chlorination of sucrose derivative by vilsmeier haack reagent by using methods as described in example 1 after chlorination 950 liters of the reaction mass is neutralized to ph 7 0 7 5 the reaction mass is cooled to room temperature 25 30 u00b0 c and centrifuged to remove suspended solids the filtrate is passed through agitated thin film dryer atfd to remove dmf details on atfd are as per given in the patent applications wo2005 090374 a1 and wo2005 090376 a1 the solids obtained after atfd were tested for dmf absence by gas chromatographic gc analysis the atfd solids 400 kg which contains 6 acetyl tgs and other inorganic salts were dissolved in 3 4 times w v of water the same could have been.