Method for detecting neutralization reaction endpoint in production of trisodium phosphate and application of method

Through an automatic potentiometer titrator to the reaction end point and the k value of trisodium phosphate neutralization degree is solved, and the problem of difficult to quickly and accurately detect the trisodium phosphate neutralization reaction end point in the prior art is realized, and a fast, accurate and low-cost detection method is achieved, which improves the stability and pass rate of product quality.

CN119643783APending Publication Date: 2025-03-18GUIZHOU WENGFU JIANFENG CHEM IND
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Patent Information

Application Number
CN202411817258.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The prior art is difficult to quickly and accurately detect the end point of the trisodium phosphate neutralization reaction, resulting in unstable product quality, and the existing analysis methods are costly and cumbersome to operate, making it difficult to apply in the production process.

Method used

By preparing a standard solution of hydrochloric acid and sodium hydroxide, titrate to the reaction end point using an automatic potentiometer, calculate the k value of trisodium phosphate neutralization, and determine the end point and degree of the neutralization reaction.

Benefits of technology

It realizes rapid, accurate and low-cost detection of trisodium phosphate neutralization reaction endpoints, improves product quality stability and pass rate, and reduces the back-end process cost.

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Abstract

The invention belongs to the technical field of phosphate production and quality control, and particularly relates to a method for detecting a neutralization reaction endpoint in production of trisodium phosphate and application of the method. (2) potentiometric titration: titrating the to-be-detected sample solution to a reaction end point A1 by using a hydrochloric acid standard solution, recording the volume V1 of the consumed standard solution, continuously titrating to a reaction end point A2 by using a sodium hydroxide standard solution, and recording the volume V2 of the consumed standard solution; (3) calculating the reaction endpoint ratio of trisodium phosphate; (4) if the value of k is greater than 2.5, indicating that unreacted NaOH exists in the to-be-detected sample solution; if the value of k is less than 1.5, Na2HPO4 exists in the sample solution to be detected; if k is larger than or equal to 1.5 and smaller than or equal to 2.5, the content of anhydrous trisodium phosphate is larger than or equal to 97%, and the total phosphorus content is larger than 42%; the detection method provided by the invention improves the scientificity and accuracy of neutralization reaction endpoint determination, does not need electrode calibration and temperature compensation, and improves the accuracy of endpoint determination.
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