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Method for detecting methanol in light petroleum

A technology for light petroleum and detection methods, which is applied in the preparation of test samples, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions. It can solve the problems of large instrument volume and detection limit. High cost, high cost, etc., to achieve the effect of low detection cost, low condition requirements, and simple operation

Active Publication Date: 2016-07-20
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Disadvantages of the current method: 1. The gas chromatography method is time-consuming, the instrument is large in size and high in cost, and many auxiliary equipments are required so that rapid on-site detection cannot be performed; 2. The infrared analysis method is easily interfered by other alcohols due to the similar infrared absorption peak of alcohols, and the detection limit High; 3. Optical polarimetry, poor anti-interference

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  • Method for detecting methanol in light petroleum
  • Method for detecting methanol in light petroleum
  • Method for detecting methanol in light petroleum

Examples

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example 1

[0043] The detection method of methyl alcohol in described light oil specifically comprises the following steps:

[0044] Step a, take 100 parts by volume of light petroleum, add 10 parts by volume of distilled water, mix uniformly and leave to separate to obtain an oil phase and an aqueous phase;

[0045] Step b, take 1 volume part of the water phase, add 1.5 volume parts of 0.19mol / L potassium permanganate aqueous solution, mix well, heat until the solution appears brick red turbid, add 1 volume part of 0.45mol / L oxalic acid aqueous solution , shake until the solution is transparent and bright red, so that the excess potassium permanganate is completely neutralized;

[0046] Step c, add 1 volume part of 0.16mol / L color-changing acid aqueous solution to the solution obtained in step 2, stir until the solution is light yellow, then add 2 volume parts of concentrated sulfuric acid, if it is observed that purple purple color appears in the solution then It means that the methan...

example 2

[0075] A method for detecting methanol in light petroleum, comprising the following steps:

[0076] Step 1. Take 80 parts by volume of light petroleum, add 12 parts by volume of distilled water, mix evenly and leave to separate to obtain an oil phase and an aqueous phase;

[0077] Step 2: Take 1.2 parts by volume of the water phase, add 2 parts by volume of 0.25mol / L potassium permanganate aqueous solution, mix well, heat until the solution appears brick red and turbid, add 2 volume parts of 0.54mol / L oxalic acid aqueous solution , shake until the solution is transparent and bright red, so that the excess potassium permanganate is completely neutralized;

[0078] Step 3, add 1.2 parts by volume of 0.19mol / L aqueous solution of color-changing acid to the solution obtained in step 2, stir until the solution is light yellow, then add 2.5 parts by volume of concentrated sulfuric acid, if it is observed that purple viola appears in the solution then It means that the methanol cont...

example 3

[0087] A method for detecting methanol in light petroleum, comprising the following steps:

[0088] Step 1. Take 120 parts by volume of light petroleum, add 8 parts by volume of distilled water, mix evenly, and leave to separate to obtain an oil phase and an aqueous phase;

[0089] Step 2: Take 0.8 parts by volume of the water phase, add 1 part by volume of 0.13 mol / L potassium permanganate aqueous solution, mix well, heat until the solution appears brick-red turbid, add 1 volume part of 0.36 mol / L oxalic acid aqueous solution , shake until the solution is transparent and bright red, so that the excess potassium permanganate is completely neutralized;

[0090] Step 3, add 0.8 parts by volume of 0.12mol / L aqueous solution of color-changing acid to the solution obtained in step 2, stir until the solution is light yellow, then add 1.5 parts by volume of concentrated sulfuric acid, if it is observed that purple purple color appears in the solution then It means that the methanol ...

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Abstract

The invention provides a method for detecting methanol in light petroleum; the method comprises the following steps: step one, taking 80-120 parts by volume of the light petroleum, and adding 8-12 parts by volume of distilled water; step two, taking 0.8-1.2 parts by volume of an aqueous phase, adding 1-2 parts by volume of a potassium permanganate aqueous solution, mixing evenly, heating until the solution has a brick-red turbid matter appearing, adding 1-2 parts by volume of an oxalic acid aqueous solution, and oscillating until the solution is transparent and bright red; step three, adding 0.8-1.2 parts by volume of a chromotropic acid aqueous solution into the solution obtained in the step two, stirring until the solution is light yellow, then adding 1.5-2.5 parts by volume of concentrated sulfuric acid, if the solution is observed to be purple blue, indicating that the content of methanol in the light petroleum is higher than 0.5%, and if the solution is still light yellow, indicating that the light petroleum does not contain methanol or the content of methanol in the light petroleum is less than 0.5%. The method can realize fast, simple, inexpensive and on-site detection of methanol in the light petroleum.

Description

technical field [0001] The invention belongs to the technical field of methanol detection, in particular to a method for detecting methanol in light petroleum. Background technique [0002] The methanol content in gasoline will affect the power, volatility, gum content and other properties of the oil. Adding methanol in violation of regulations will seriously affect the quality of oil products. Therefore, finding a method that can quickly detect methanol in gasoline on the spot can prevent problematic gasoline from flowing to the market in time, which is of great significance for safe production activities. [0003] There are currently several methods for detecting methanol in light petroleum products: 1. Gas chromatography; 2. Infrared analysis; 3. Optical rotation analysis. [0004] Disadvantages of the current method: 1. The gas chromatography method is time-consuming, the instrument is large in size and high in cost, and many auxiliary equipments are required so that ra...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/28
Inventor 赵海洋贾亮郭新平杨宏常安晓王本刚韩路朱启航夏静李冲申红彬周强
Owner PETROCHINA CO LTD
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