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Method for assaying residual acid of nitroglycerin

A technology of nitroglycerin and determination method, which is applied in the preparation of test samples and chemical analysis by titration, etc. It can solve the problem of affecting the stability of nitroglycerin, affecting the safety and storage time of nitroglycerin, and the inability to determine the residual nitroglycerin. acid and other problems to achieve the effect of ensuring accuracy and avoiding interference

Active Publication Date: 2013-08-14
宜宾北方川安化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain qualified nitroglycerin products, the residual acid in nitroglycerin must be washed by water washing, alkali washing, etc., and the whole system must be kept weakly alkaline. If the residual acid wrapped in nitroglycerin is not cleaned, it will affect nitration. The stability of glycerin, which affects the safety and storage time of nitroglycerin production
[0003] There are mainly two methods at present, but both are only used to determine the total pH of nitroglycerin, and cannot determine the residual acid wrapped in nitroglycerin:

Method used

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  • Method for assaying residual acid of nitroglycerin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Accurately weigh 15g of nitroglycerin into an Erlenmeyer flask, add a certain amount of water, and shake gently to completely dissolve the lye in the nitroglycerin in the water. After standing for stratification, discard the supernatant, and repeat the extraction in this way. After the lye extraction is complete, add 100 ml of methanol or ethanol and other neutral organic solvents that are miscible with nitroglycerin and water into the conical flask, shake well, and after the sample is completely dissolved, add 3 drops of methyl red- Methylene blue mixed indicator, titrate with 0.01moL / L hydrochloric acid standard solution until it just becomes purple as the end point, and do blank test at the same time, the residual acid in nitroglycerin is represented by the difference between the volume of the sample and the blank consumed standard solution.

[0020]

Embodiment 2

[0022] In order to verify that the water in the domestic method cannot extract the residual acid in the nitroglycerin, the inventor has done the impact test of the number of extractions on the measurement result respectively: the results are as follows:

[0023]

[0024] From the above tests, it can be seen that there is basically no difference in the measurement results with different extraction times, indicating that water can only extract the free alkali in the nitroglycerin, but not the residual acid in the nitroglycerin.

[0025]

Embodiment 3

[0027] Comparison of European and American standard test results with domestic standard test results:

[0028]

[0029] As can be seen from the above results, the method of the present invention is accurate to the determination result of residual acid.

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Abstract

The invention discloses a method for assaying residual acid of nitroglycerin, belonging to the field of inorganic chemical analysis. The method comprises the following steps of: extracting alkaline liquid from the nitroglycerin by using water; completely dissolving the extracted nitroglycerin by using a neutral organic solvent which is a mixture of nitroglycerin and water; and assaying the residual acid content of the dissolved nitroglycerin by an acid base titration method. The invention relates to a method for assaying the residual acid (nitric acid and sulfuric acid) of the nitroglycerin.

Description

technical field [0001] The invention belongs to the field of inorganic chemical analysis and is used for determining residual acids (nitric acid and sulfuric acid) in nitroglycerin. Background technique [0002] Nitroglycerin is produced by reacting glycerin with nitric acid under the catalysis of sulfuric acid. In order to obtain qualified nitroglycerin products, the residual acid in nitroglycerin must be washed by water washing, alkali washing, etc., and the whole system must be kept weakly alkaline. If the residual acid wrapped in nitroglycerin is not cleaned, it will affect nitration. The stability of glycerin affects the safety and storage time of nitroglycerin production. [0003] There are mainly two methods at present, but both are only used to determine the total pH of nitroglycerin, and cannot determine the residual acid wrapped in nitroglycerin: [0004] The military standards in European and American countries currently use to dissolve quantitative nitroglyceri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N31/16
Inventor 黄德江罗伦忠曹远洋胡相红陈太俊杨晓容
Owner 宜宾北方川安化工有限公司
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