I would like to ask about the determination of the color based on the ester value of symmetric esters
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I would like to ask about the determination of the color based on the ester value of counteresters. The current national standards specify the use of a sodium hydroxide standard titrant solution for neutralization, and the color of the sample solution changes from pink to orange-yellow. What is the definition of this orange-yellow color? What manufacturing process was used to produce this product?
Since it is a para-ester, it should be an ester formed from a carboxylic acid substituted in the para position on the aromatic ring; therefore, there must be detailed instructions regarding the analytical methods for such esters. The vast majority of people in the shrine have never seen this analysis method, so they are unable to engage in in-depth discussions. For differences in the titration endpoint, the sample blank can be used to assist in making a judgment, as there is a color difference before and after the endpoint. Is there such a standard analytical method? If there is, send it over for everyone to see. Based on chemical capacity titration analysis methods and results, it is generally not possible to determine the production process of the sample.