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Method for determining contents of microscale allene and acetylene in MTO (methanol to olefin) products through gas chromatography

A technology of gas chromatography and propadiene, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of interfering trace acetylene, unknown components and acetylene cannot be separated, and achieve good repeatability, good technical effect, quantitative analysis accurate results

Active Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that when the existing chromatographic method analyzes the content of trace acetylene in MTO products, there are problems that unknown components and acetylene cannot be separated and interfere with the determination of trace acetylene content. A new method for the determination of trace acetylene in MTO products is provided Method for trace propadiene and acetylene content

Method used

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  • Method for determining contents of microscale allene and acetylene in MTO (methanol to olefin) products through gas chromatography
  • Method for determining contents of microscale allene and acetylene in MTO (methanol to olefin) products through gas chromatography
  • Method for determining contents of microscale allene and acetylene in MTO (methanol to olefin) products through gas chromatography

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Embodiment 1

[0020] according to figure 1 According to the flow chart, the standard samples I~II containing propadiene and acetylene were analyzed, and the measurement was repeated 5 times. The typical chromatographic analysis conditions are shown in Table 1. The composition of standard samples is shown in Table 2. The chromatogram of standard sample II is shown in Table 1. figure 2 . The standard sample II was used as the calibration sample, and the calibration curve was used as the quantitative calculation of the actual samples to examine the precision and accuracy of the method. The results of standard sample analysis are shown in Table 3.

[0021] Table 1 Typical chromatographic analysis conditions

[0022]

[0023] Table 2 The composition of standard samples I~II (concentration unit: mol%)

[0024] components

I

II

Propylene

0.0016

0.10

Acetylene

0.0011

0.19

balance gas

Propylene

helium

[0025] Tabl...

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Abstract

The invention relates to a method for determining contents of microscale allene and acetylene in MTO products through gas chromatography to mainly solve a problem that the determination of the content of microscale acetylene is interfered because unknown components and acetylene cannot be separated when the content of the microscale acetylene in the MTO products is analyzed through present chromatographic methods. The method comprises the following steps: injecting a sample of an analyte which is the MTO products from a chromatographic shunting introduction port (1), separating through an Al2O3PLOT capillary chromatographic column (2) deactivated by Na2SO4 or KCl, and detecting through a hydrogen flame ionization detector (3) after completely separating the allene, the acetylene and other hydrocarbon components by the chromatographic column (2). The method well solves the problem through above technical scheme, and can be applied to industrial production about the chromatographic analysis of the contents of the microscale allene and the microscale acetylene in the MTO products.

Description

technical field [0001] The invention relates to a method for measuring the contents of trace propadiene and acetylene in MTO products by gas chromatography. Background technique [0002] Light olefins such as ethylene and propylene are basic organic raw materials in the modern chemical industry, and the traditional process route for producing ethylene and propylene is naphtha cracking. New methods for preparing low-carbon olefins such as ethylene and propylene from coal or natural gas via methanol, such as Methanol to Olefins (MTO) and Methanol to Propylene (MTP), are the most promising new processes to replace petroleum routes And it is moving towards industrialization. The main products of methanol to olefins (MTO) and methanol to propylene (MTP) are olefins, and a large amount of water and some low-carbon oxygenated compounds such as by-products of aldehydes, ketones, alcohols, ethers, and acids will also be produced. Trace amounts of alkynes such as acetylene and diene...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/68
Inventor 李继文李薇王川
Owner CHINA PETROLEUM & CHEM CORP
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