Dimethyl ether is a colorless and easily liquefied gas, and its production process mainly includes the two-step synthesis process of methanol liquid-phase or gas-phase dehydration, or the one-step process of direct synthesis of synthesis gas. Currently, in China, coal or petroleum and natural gas are mainly used as raw materials to generate water gas for the synthesis of methanol, followed by methanol dehydrationAfter catalytic conversion, dimethyl ether and trace impurities such as carbon monoxide, methane, carbon dioxide, ethylene, ethane, propylene, propane, methanol, and water are generated. For the detection of fuel grade dimethyl ether products, gas chromatography is used, and thermal conductivity and hydrogen flame detectors are used to determine the components in the dimethyl ether products and the methanol, water, exhaust gas, and wastewater in the production process. External standard method or calibration area normalization method is used for quantificationused forFuel GradeQuality control analysis of dimethyl ether products.

Our company's researchers have conducted research based onCharacteristics of producing fuel grade dimethyl ether,Develop high-performance detection for dimethyl ether, methanol, and waterGC-7890 specialized gas chromatograph. Gas chromatography manufacturer Xuan Sheng Ke Yi

Analysis of Production Process for Dimethyl Ether Fuel Gas Chromatography Manufacturer's Plan

needInstruments and equipment:

GC-7890 gas chromatograph: dual detector (TCD, FID)/methane converter/dual gas injection system

Stainless steel chromatography column:

Dimethyl ether dedicated chromatography column (GDX-502, 25% PEG-1500/porapak Q imported support) (1 piece ￠4＊4m）

modifiedGDX-502 chromatographic column (1 piece ￠4＊2m)

TDX-01 (1 piece ￠3＊2m)

liquefied gasSampling steel cylinder(250ml) and sampling bag

Data processing: computer andN-2000Chromatography workstation

Analytical balance (one ten thousandth)

• Reagents and materials:

Carrier gas: high-purity nitrogen, high-purity hydrogen, air（AirRequire no oil, no impurities)

Standard gas:

AConstantCO、CH4、CO2Standard gas

BDimethyl ether product standard gas:CO、CH4、CO2、C2H4、C2H6、C3H6、C3H8、CH3OCH3、CH3OH、H2O.

Chromatographic grade methanol, distilled water

Sample glass instrument: 10ml test tube with stopper, 10ml flask, dropper

• Chromatographic conditions:

Column temperature: 100 ℃ Gasification: 160 ℃ Detection (FID): 140 ℃ Thermal conductivity: 140 ℃ Bridge current: 140mA

Flow rate: 35ml/min Sample: Standard

Testing items：

1. Raw material methanol detection:

The raw material methanol is mainly used to detect water in methanol. A thermal conductivity detector is used, and a modified GDX-502 chromatographic column is used for separation. The area correction normalization method is used for quantification, and the injection volume is 1ul. The analysis spectrum is as follows:

2. Gasification tower kettle liquid analysis:

useThermal conductivity detector detection,Separation of gasification tower kettle liquid using modified GDX-502 chromatographic columnMethanol, waterPerform testing, use area correction normalization method for quantification, and inject a sample volume of 1ul