Rapid titrating method for detecting acidity of glyceryl triacetate

Abstract

The invention relates to a rapid titrating method for detecting the acidity of glyceryl triacetate. The method comprises the following steps of 1, preparing a 10g/L phenolphthalein indicator according to GB/T603; preparing a 0.02mol/L sodium hydroxide standard titration solution according to GB/T601; 2, placing 50mL anhydrous ethanol into a 250mL conical flask, adding three drops of phenolphthalein indicator and shaking up; adding a 0.02mol/L NaOH solution by adopting an electric continuous liquid dispenser, wherein 0.06mL of NaOH solution is added every time until the solution just turns pink; 3, adding 40g of sample into the conical flask, shaking up, adding the 0.02mol/L NaOH solution by utilizing the electric continuous liquid dispenser, wherein 0.13mL of NaOH solution is added every time until the solution turns pink like that in the previous step, determining the end point when the solution does not fade after maintaining for 10s, and recording the liquid adding times n; and 4, directly obtaining the acidity of the glyceryl triacetate according to a conversion table of the liquid adding times and the acidity through the liquid adding times n. The method has the advantages of simplicity and convenience in operation and accuracy, visualization and high efficiency in determination.

Description

[0001] technical field [0002] The invention relates to the technical field of physical and chemical testing of the acidity of triacetin in tobacco materials, in particular to a rapid titration method for the acidity of triacetin. Background technique [0003] Glyceryl triacetate is a commonly used plasticizer for cellulose acetate filter rods. In order to achieve sufficient hardness, the target dosage of glycerol triacetate is generally 6% to 10% of the weight of the entire filter rod. [0004] Triacetin and water can undergo saponification reaction (ie, the reversible reaction of esterification reaction). In the presence of acid, alkali, high temperature or other impurities, the reaction speed is greatly accelerated, and diacetin and acetic acid are generated. decrease, acidity increases, and the quality deteriorates until it cannot be used; and if the added plasticizer itself has sour taste or other miscellaneous gases, these components enter the human mouth with the hig...

AI Technical Summary

Problems solved by technology

[0004] Triacetin and water can undergo saponification reaction (reversible reaction of esterification reaction), in the presence of acid, alkali, high temperature or other impurities, the reaction The speed is greatly accelerated, and diacetin and acetic acid are produced, which reduces the content of the product, increases the acidity, and deteriorates the quality until it cannot be used; and if the added plasticizer itself has a sour taste or other miscellaneous gases, these components are smoked in the smoke During the process, as the higher-temperature smoke flows into the mouth, it will increase the smoker's prickly, miscellane...

Images