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Analytic method for measuring content of each component in sulfuric acid and nitric acid mixture

An analysis method and mixture technology, which are applied in chemical analysis by titration, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc. The problems of low sensitivity and high detection cost can achieve the effect of low experimental cost, obvious color change and wide detection range.

Inactive Publication Date: 2015-02-18
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an analytical method for measuring the content of each component in a mixture of sulfuric acid and nitric acid, which solves the problems of high detection cost, high detection requirements, and low detection sensitivity in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this program, a mixture of sulfuric acid and nitric acid of known concentration is used as a test sample. The operation steps are as follows:

[0025] 1. Preparation of standard solutions of sodium hydroxide, ferrous sulfate and potassium permanganate;

[0026] 2. Sample preparation: prepare 100g of sulfuric acid solution with 90% or so, titrate its exact concentration with NaOH standard solution, prepare about 30g of 50% nitric acid solution, titrate its exact concentration with NaOH standard solution, accurately weigh 50g of sulfuric acid solution and add slowly Weigh 15g of nitric acid solution to form a mixed acid sample, weigh 10g (accurate reading to 0.0002g) of the mixed acid sample, record it as mg, transfer it to a 250mL volumetric flask after dissolution, and make it into a stock solution to be tested;

[0027] 3. Determination of total acidity: accurately pipette 5mL of the above stock solution (V 1 ) in a clean Erlenmeyer flask, add 2 drops of phenolpht...

Embodiment 2

[0033] This program is to use the standard solution of nitric acid as the test sample, and other operations are the same as in Example 1.

[0034] Test results:

[0035] The arithmetic mean of the three parallel determination results is taken as the final measurement result, which is very close to the concentration of the standard solution, and the relative average standard deviation is 0.79%.

Embodiment 3

[0037] This program is to measure the reaction mixed acid solution of three batches of isooctyl nitrate made by the laboratory. Sample preparation: Weigh about 20 grams of mixed acid sample, dilute with water, and dilute to 25 omL. Other operations are the same as in Example 1.

[0038] Test results:

[0039] ① sulfuric acid content: 77.86%, nitric acid content: 3.91%; ② sulfuric acid content: 77.11%, nitric acid content: 2.48%; ③ sulfuric acid content: 78.35%, nitric acid content: 1.20%. For each batch of samples, the arithmetic mean of three parallel determination results was taken as the final determination result, and the relative average standard deviations were 0.91%, 0.77%, and 0.81%, respectively.

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Abstract

The invention discloses an analytic method for measuring the content of each component in a sulfuric acid and nitric acid mixture. The method comprises the following steps: firstly measuring the total acidity of the mixture by adopting an acid-base titration method; subsequently measuring the content of nitric acid by adopting an oxidation-reduction titration method, wherein discoloration sensitivity is improved by adding an auxiliary indicator such as sodium diphenylaminesulfonate so as to correctly judge a titration end point; finally calculating the difference value to obtain the content of the sulfuric acid. The method has the advantages of simple detection requirements and conditions, low detection cost, high sensitivity, accurate and reliable results and the like.

Description

technical field [0001] The invention relates to an analysis method for determining the content of residual sulfuric acid and nitric acid in the mixed acid after separation, in particular to an analysis method for determining the content of each component in the mixture of sulfuric acid and nitric acid. Background technique [0002] Isooctyl nitrate is a generally accepted diesel cetane number improver. It can increase the cetane number of diesel oil, improve the combustion performance of diesel oil, shorten the ignition time, lower the ignition point, provide the power performance of the locomotive under hot working conditions, and have a very obvious fuel-saving effect. The production of nitrates generally adopts the classic method of alcohol nitration, that is, the mixed acid method, which uses nitric acid and isooctyl alcohol as raw materials, and sulfuric acid as a catalyst for reaction, standing for stratification, and separating the nitric acid and sulfuric acid in th...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/79
Inventor 林春花雷志伟刘德永廖维林
Owner JIANGXI NORMAL UNIV
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