Research On Synthesis And Properties Of Sucrose Polyester In Phase-Transfer Method

With the fat people getting more and more, fat substitutes are fashionable through the world, as one type of substitute; sucrose polyester will have a broad future of application in low caloric food area. But there are still some problems in synthesis of sucrose polyester, such as littlie material, poisonous methanol,reaction too long. For the above problems, this paper had one research in the synthesis of fatty acid ethyl ester, the synthesis, purification and properties of sucrose polyester, which mainly contains the following parts:1. Research on the synthesis of the sucrose polyester material-fatty acid ethyl esterEthyl ester of soybean oil was prepared through transesterification of soybean oil and ethanol catalyzed by KOH catalyst, through single factor experiment and Box-Behnken mode of response surface methodology, the optimum reaction conditions were as follows: KOH dosage 1.3%, methanol to oil molar ratio 8.3:1, reaction temperature 74.8℃, reaction time 130minutes, In this condition, the conversion rate of soybean oil was 98.93%. And the structure of product was analyzed by FTIR; the result showed that transesterification was satisfied.2. Research on the synthesis of sucrose polyester catalyzed by Phase-transfer catalystCetyltrim ethylammonium bromide as high efficiency catalyst was selected, Soybean sucrose polyester was prepared from ethyl ester of soybean oil and sucrose catalyzed by phase-transfer catalyst-Cetyltrim ethylammonium bromide in two step method, through single factor experiment and Box-Behnken mode of response surface methodology, and two optimum reaction conditions were optimized. The conditions of product heated by oil were as follows:reaction temperature 135℃,catalyst amount 4.1%,ester and sucrose molar ratio 13.5:1,reaction time 5.5h. The product yield reached 90.72%, and the average esterfication degree reached 7.1.The other conditions under Microwave irradiation were as follows:Catalyst amount 2.3%, microwave power 433w reaction time 33min. The product yield reached 88.81%, and the average esterfication degree reached 6.5. Microwave irradiation method reduced the raction time to 1/10, consideded the energy consum and other factors, microwave irradiation method had bigger advange.3. Research on the separation, purification, structure determination, qualities analysis of sucrose polyesterIn the separation and purification of sucrose polyester, The optimal conditions of SPE separation was:100-200 meshes silica gel as column packing, petroleum:anhydrous ether:acetic acid(90:10:1, V/V/V) as eluent, eluent flow rate 2.0mL/min,column packed height 60cm,sample loading 2g. Study on the regeneration of colum, silica was washed by 4-5 times ethanol, the columncould be used for 4 times. Product structure was analysised by UV, FTIR, NMR, the result hydroxide group disappear basically, ester group appear showed that separated sample was SPE, it was satisfied. Then, the product quality was analysised. The resut showed general indexes of product satisfied sucrose ester standar GB 8272-1987, and oil specilities were closed to material oil.4. Research on the effect of material oil on the properties of sucrose polyesterAt last, soybean oil, rap oil, palm oil as materials were synthesised SPE through esterfication reaction.Research on SPE physical and chemical properties, enzyme dissolution, the result showed that materials don't have influence on dissolution, enzyme dissolution. But has a little influence on other physical and chemical properties, soybean SPE could be usd as fried oil, rap SPE could be used as capsule to lose fat, and palm SPE could be used in low caloric chocolate food as cocoa fat substitutes. Esterified degree influences on enzyme dissolution, break up as Esterified degree under 6, but it doesn't break up as esterified degree above 6.