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The invention belongs to the technical fields of spices and in particular relates to a synthetic process of ethyl maltol. The process comprises a chlorination reaction step, a hydrolysis rearrangement step and a sublimating and purifying step, wherein the chlorination reaction is realized by reacting alpha-ethylfuran methanol with chlorine at the flow ratio of (1.8 to 2.3L):1kg to generate a hydroxy chlorovinylketone intermediate; the hydrolysis rearrangement means that the hydroxy chlorovinylketone intermediate is hydrolyzed at the temperature of 90 to 105DEG C for 3 to 4.5 hours to obtain an ethyl maltol coarse crystal; the coarse crystal is sublimated and purified under the conditions that the temperature is 200 to 225DEG C and the pressure is 0.080 to 0.090MPa to obtain an ethyl maltol product. The synthetic process disclosed by the invention is detailed and specific in operation and is stable; the chlorinating efficiency is improved and the generation of foamed yellow crystals is controlled; meanwhile, sublimating and purifying conditions are controlled, thereby effectively improving the yield and the purity of the ethyl maltol.

A method for simultaneously extracting jujube polysaccharide and jujube flavone in sequence from jujube is that most part of monosaccharide and disaccharide in jujube is removed by the yeast fermentation method and the jujube polysaccharide and jujube flavone are extracted respectively from fermentation liquid and the fermented jujube residue. Jujube powders and water are extracted according to acertain proportion, are added with activated yeast to carry out the aerobic fermentation to complete the fermentation when the residual sugar content of reducing sugar is 2 to 5 percent (weight); filtrate and filtrate residue are obtained by filtering; the filtrate is concentrated with ethanol precipitation, and is filtered, deproteinized and dried to obtain the jujube polysaccharide. The filter residue is refluxed and extracted by ethanol solution, the extract liquid is reduced in pressure and concentrated, extracted by petroleum ether, removed the petroleum ether and absorbed by a macroporous resin column; eluent is reduced in pressure, concentrated and carried out the vacuum freeze drying to obtain the jujube flavone. The method has the advantages of reduction of the interference on extracting the jujube polysaccharide and the jujube flavone, no pollution, energy saving, synchronous extraction of the jujube polysaccharide and the jujube flavone, low cost of products by one process,and can be volume-produced by industrialization.