Method for measring dimethyl ether content in liquefied petroleum gas
A technology of liquefied petroleum gas and dimethyl ether, which is used in measuring devices, instruments, scientific instruments, etc., to achieve the effects of simple operation, guaranteed representativeness and fast analysis speed
Inactive Publication Date: 2012-10-24
PROD QUALITY SUPERVISING & INSPECTING INST OF TAIZHOU CITY
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However, these methods all use packed columns, which cannot separate the dimethyl ether mixed therein.
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[0009] exist figure 1 and figure 2 Among them, the present invention provides a kind of method for measuring the content of dimethyl ether in liquefied petroleum gas, it comprises the following steps: Step 1, prepare standard sample by weighing method, matrix is liquefied petroleum gas, the quality of dimethyl ether in the standard sample The fractions are 1.12%, 24.6%, 0.82%, and 18.9%; step 2, extract liquefied petroleum gas from the steel cylinder to take liquid samples, open the inlet valve and outlet valve of the sample gasification system, and the liquid samples are fed by the six-way gas sampling valve Enter the inlet valve of the sample gasification system, replace it through the replacement pipeline of the sample gasification system, and then flush it through a constant temperature water bath. After flushing and replacement are complete, a gas sample is formed. The length of the pipeline in the constant temperature water bath is 1m. Control the temperature at 50°C...
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Abstract
The invention discloses a method for measring dimethyl ether content in liquefied petroleum gas, which comprises 1) preparing a standard sample by a weighing method, wherein the matrix is liquefied petroleum gas, and the mass fraction of the dimethyl ether in the standard sample are 1.12%, 24.6%, 0.82% and 18.9%; 2) extracting liquefied petroleum gas from a steel cylinder and taking a liquid state sample, displacing the liquid state sample through a sample gasification system, flushing and forming a gas sample, then slowly opening a flow control valve, flowing the gas sample out and controlling the gasification speed, flowing the gas sample from an outlet valve into a sampler, closing a suction valve, and clicking the sampling, transferring a six-way valve into a sample introduction position, then placing the liquid sample through a quantification ring to a capillary chromatographic column for heating and analysizing, wherein the capillary chromatographic column bonds polystyrene and divinyl benzene, the polarity is between Porapak-Q and Porapak-N, and realizing the separation of dimethyl ether and liquefied petroleum gas; 3) analyzing the standard sample with mass fraction of 1.12%, 0.82 and 18.9% according to a apparatus work condition; and 4) detecting the separated sample and performing added standard recovery tests.
Description
technical field [0001] The invention provides a method for measuring the content of dimethyl ether in liquefied petroleum gas. Background technique [0002] Liquefied petroleum gas is one of petroleum products, a colorless, volatile gas obtained by pressurizing, cooling, and liquefying refinery gas or natural gas (including oilfield associated gas). The liquefied petroleum gas obtained from refinery gas is mainly composed of propane, propylene, butane, and butene, and also contains a small amount of pentane and pentene. Dimethyl ether, also known as methyl ether (DME for short), is a colorless gas or compressed liquid under normal pressure, with a slight ether fragrance. Dimethyl ether is easy to compress, easy to store, high combustion efficiency, low pollution, and can replace coal gas and liquefied petroleum gas as civil fuel. However, due to its strong corrosiveness to plastic substances, the civil liquefied gas cylinders used on the market are not suitable for filling...
Claims
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Inventor 陈妍
Owner PROD QUALITY SUPERVISING & INSPECTING INST OF TAIZHOU CITY