Humectant for cigarettes and preparation method thereof
A humectant and structural formula technology for tobacco, which is applied in the field of new moisturizer for tobacco and its preparation, achieves significant industrial application value and popularization and application, improves roundness and comfort, and has the effect of good physical moisturizing effect
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Embodiment 1
[0043] A method for preparing a humectant for tobacco (1-O-carboxymethyl-D-fructofuranose), comprising the steps of:
[0044] (1) Preparation of 1,2:3,4-di-O-isopropylidene-α-D-fructopyranose (Ⅱ)
[0045] In a 500mL three-neck flask equipped with a magnetic stirring device, a thermometer and a reflux condenser, add 240mL of dried acetone, cool in an ice-water bath to lower the temperature to about 5°C, add 12g of anhydrous D-fructose under stirring, and then Slowly add 6 mL of concentrated sulfuric acid dropwise, keeping the temperature below 10°C during the dropwise addition. After the dropwise addition, the ice-water bath was removed, and the temperature was naturally raised to 15° C. and stirred for 1 h.
[0046]After the reaction was completed, 33.3% aqueous sodium hydroxide solution was added dropwise to adjust the pH value of the reaction solution to 7. Subsequently, the reaction liquid was concentrated under reduced pressure to make the volume to about 50 mL (unreacte...
Embodiment 2
[0055] A preparation method of a novel humectant for cigarettes, comprising the steps of:
[0056] (1) Preparation of 1,2:3,4-di-O-isopropylidene-α-D-fructopyranose (Ⅱ)
[0057] In a 1000mL three-necked flask equipped with a magnetic stirring device, a thermometer and a reflux condenser, add 360mL of dried acetone, cool in an ice-water bath to lower the temperature to about 5°C, add 12g of anhydrous D-fructose under stirring, and then Slowly add 12 mL of concentrated sulfuric acid dropwise, keeping the temperature below 10°C during the dropwise addition. After the dropwise addition was completed, the ice-water bath was removed, and the temperature was raised to 35° C. and the reaction was stirred for 1 h.
[0058] After the reaction was completed, 33.3% aqueous sodium hydroxide solution was added dropwise to adjust the pH value of the reaction solution to 8. Subsequently, the reaction solution was concentrated under reduced pressure to a volume of about 50 mL (unreacted acet...
Embodiment 3
[0067] A preparation method of a novel humectant for cigarettes, comprising the steps of:
[0068] (1) Preparation of 1,2:3,4-di-O-isopropylidene-α-D-fructopyranose (Ⅱ)
[0069] In a 1000mL three-necked flask equipped with a magnetic stirring device, a thermometer and a reflux condenser, add 280mL of dried acetone, cool in an ice-water bath to lower the solution temperature to about 5°C, add 12g of anhydrous D-fructose under stirring, Then slowly add 8 mL of concentrated sulfuric acid dropwise, keeping the temperature below 10°C during the dropwise addition. After the dropwise addition, the ice-water bath was removed, and the temperature was raised to 25° C. and the reaction was stirred for 1.5 h.
[0070] After the reaction, 33.3% aqueous sodium hydroxide solution was added dropwise to adjust the pH of the reaction solution to 7.5. Subsequently, the reaction liquid was concentrated under reduced pressure to make the volume to about 50 mL (unreacted acetone was removed), the...
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