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Method for detecting content of metal ions in methyl alcohol

A technology for metal ions and determination methods, applied in measurement devices, material separation, instruments, etc., can solve the problems of long cycle and long cycle, which is not conducive to multi-component detection of large-scale samples, meet the detection limit requirements, save analysis costs, Ease of handling

Active Publication Date: 2014-09-17
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a method for determining the content of metal ions in methanol, so as to solve the problem in the prior art that the period of determining the content of metal ions in methanol is long and the cycle is long, which is not conducive to the multi-component detection of large batches of samples

Method used

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  • Method for detecting content of metal ions in methyl alcohol
  • Method for detecting content of metal ions in methyl alcohol
  • Method for detecting content of metal ions in methyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Raw material: MTO grade methanol sample to be tested

[0055] Prepare the sample to be tested: accurately measure 200ml of MTO grade methanol sample into a 250ml Erlenmeyer flask, place a cap on the top of the Erlenmeyer flask, heat in a water bath at 80°C for 2 hours to obtain a metal ion mixture, and cool to room temperature. Use high-purity water to drip into the Erlenmeyer flask 3 times, each drop 10ml, the metal ion mixture in the Erlenmeyer flask, and clean the metal ion mixture condensed on the cover with the volatilization of methanol vapor, collect the two in a 50ml volumetric flask, High-purity water constant volume to be tested.

[0056] Test the sample to be tested: use 3-8mmol / L HNO3 The solution washes the chromatographic column in the ion chromatograph. Measuring Na in the sample to be tested by ion chromatograph + 、K + , Mg 2+ and Ca 2+ of the peak area. According to the corresponding standard curve established by each metal ion, the corresponding ...

Embodiment 2

[0061] Raw material, preparation test sample, and test test sample are all with embodiment 1, and wherein, eluent is 7mmol / LHNO 3 The mixture of dipicolinic acid and dipicolinic acid in a volume ratio of 10:1 is the eluent.

Embodiment 3

[0063] Raw materials, preparation of the sample to be tested, and testing of the sample to be tested are all the same as in Example 1, wherein the heating temperature of the water bath in the process of preparing the sample to be tested is 60 ° C, and the time is 4 hours; the number of times of adding high-purity water is 2 times, each 15ml . .

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Abstract

The invention provides a method for detecting the content of metal ions in methyl alcohol, and the method comprises the following steps: creating a standard curve on conductivity peak area and concentration of different metal ions, heating a methyl alcohol sample to be tested to volatize the methyl alcohol, mixing a metal ion mixture left when the methyl alcohol is volatized into water to form a sample to be tested, testing the sample to be tested by using an ion chromatograph to obtain corresponding peak areas of the metal ions in the to-be-tested sample, finding a concentration value corresponding to the peak area of the metal ions in the to-be-tested sample from the standard curve on conductivity peak area and concentration of the metal ions, taking the concentration value as the concentration value of the metal ions relative to water, and finally converting the content value of the metal ions according to the volumes of the to-be-tested methyl alcohol sample and the water. The analysis result of the method not only can guarantee degree of accuracy and degree of precision of analysis data, but meet the requirement on detection limit for the test; therefore, the method is suitable for the analysis of content of the metal ions in the methyl alcohol in the commercial process.

Description

technical field [0001] The invention relates to the field of methanol-to-olefins, in particular to a method for determining the content of metal ions in methanol. Background technique [0002] The Methanol TO Olefin (MTO) process provides a way to synthesize ethylene and propylene without relying on petroleum. This synthesis method can adjust the ratio of ethylene and propylene in the product in a wide range to meet market demand. [0003] For the purpose of cost saving and waste recycling, methanol can be made into synthesis gas through some carbon-containing raw materials, such as: coal, petroleum residue, natural gas, etc., which cannot be directly converted into ethylene and propylene, and then produced from the synthesis gas , because these carbon-containing raw materials contain impurities such as metal ions, which leads to the mixing of metal ions in the methanol produced therefrom. During the conversion of methanol mixed with metal ions into olefins (MTO), the conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/96
Inventor 赵灵春张大伟陶英华
Owner CHNA ENERGY INVESTMENT CORP LTD
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