Rapid Quantitative Determination of Tetrapropylammonium Bromide in Zeolite Synthesis Waste Liquid

Abstract

The invention discloses a method for quickly and quantitatively measuring the content of tetrapropylammonium bromide in zeolite synthesis waste liquid, which comprises the steps of drawing a linear curve A of the molar concentration of pure tetrapropylammonium bromide and linear curves (B1,..., Bn) of the molar concentration of tetrapropylammonium bromide in the waste liquid under different dilution ratios; performing linear regression on (B1,..., Bn) to obtain a linear curve C of which the slope error from A is not over + / -0.02%, wherein the linear curve C is used for quickly and quantitatively measuring the molar concentration of tetrapropylammonium bromide in the waste liquid; calculating the content of tetrapropylammonium bromide in the waste liquid. The method disclosed by the invention has the advantages that by establishing a linear curve A of the molar concentration of pure tetrapropylammonium bromide, adding the known amount of tetrapropylammonium bromide into the waste liquid to be measured and then performing regression correction on the measurement result, the influence on the titration effect caused by the impurities in the waste liquid is eliminated, the accurate content of tetrapropylammonium bromide in the waste liquid is obtained, the analysis precision can exceed 95%, the repeatability is high, and quick and quantitative measurement of the content of tetrapropylammonium bromide in the waste liquid is realized so that the waste liquid can be recycled.

Description

technical field [0001] The invention relates to a method for measuring tetrapropylammonium bromide content in zeolite synthesis waste liquid. Background technique [0002] ZSM-5 zeolite is widely used in various fields such as chemical reaction, gas processing and adsorption. It is the most widely used zeolite material in the chemical industry except Y-type zeolite and A-type zeolite. At present, the domestic production capacity has reached tens of thousands of tons. . [0003] The synthesis of ZSM-5 zeolite requires the use of organic quaternary ammonium salts as organic templates, among which tetrapropylammonium bromide is the most widely used organic template. Tetrapropylammonium bromide is an important cationic surfactant, which has good compatibility with other types of surfactants and has good emulsifying, wetting, solubilizing, washing, sterilizing, softening, dyeing and fixing properties. A series of properties such as color and antistatic, its chemical formula is ...

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Problems solved by technology

[0007] Although the work of Wu Wenframe and Li Yan et al. developed the HG / T2230-2006 standard, making it possible to quantitatively analyze the mass fraction of tetrapropyl sodium bromide, but in their analytical method, tetrapropyl ammonium bromide is a single Substance solution, high purity

The waste liquid of the ZSM-5 zeolite hydrothermal synthesis system contains not only tetrapropylammonium bromide, but also a large amount of sodium hydroxide, ammonia water and a large amount of SiO 2 Impurities such as small particles, the existence of these impurities makes it inevitable that there will be problems such as affecting the titration end point when using sodium tetraphenylborate for back titration, thus affecting the accuracy of quantitative analysis

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