Special gas chromatograph for determination of aromatic hydrocarbon content in gasoline

Special gas chromatograph for determination of aromatic hydrocarbon content in gasoline
Gas chromatograph, automotive gasoline detection, gasoline analysis chromatograph

Analysis Scheme for Determination of Benzene and Toluene Content in Gasoline

One Instrument Overview

According to the "Petrochemical Industry Standard SH/T0713-2002 of the People's Republic of China", our company's technical team has launched a dedicated gas chromatograph for benzene and toluene in gasoline based on the GC-7890 gas chromatograph of Shanghai Xuansheng Scientific Instrument Co., Ltd. This instrument fully meets the determination of benzene and toluene content in automotive gasoline and aviation gasoline. The scheme has the advantages of reasonable configuration, simple operation, high accuracy, fast analysis speed, and low cost. It is an ideal dedicated gas chromatograph for the petrochemical industry, refineries, and quality supervision and inspection related application fields.

II Product advantages

★ Adopting the system 3 configuration scheme in SH/T0713-2002, an imported high-performance FFAP elastic quartz capillary column is selected, which not only overcomes the interference of methanol and ethanol in the packed column but also improves the durability of the chromatographic column.
★ Adopting international advanced processes such as VICI high-temperature resistant automatic six way valve, center cutting and blowback technology, passivation treatment of instrument main pipelines, and zero dead volume pipelines.
The instrument is equipped with a hydrogen flame ionization detector (FID), which uses a logarithmic amplifier with a wider linear range. The sample is less prone to flat peaks, resulting in higher sensitivity and more accurate results.
★ It can be equipped with a high-precision gas flow control system (EPC), which provides more accurate flow and pressure control, convenient operation, intelligence, and easy maintenance.
★ Dual over temperature protection function, with powerful and comprehensive startup diagnosis function, intuitive judgment of error information, and power-off storage protection function.
★ Unique lining tube structure, unique ceramic nozzle design, and special processing technology ensure zero sample adsorption, effectively reduce tailing, and maintain stability and efficiency.
★ It adopts advanced 10/100M adaptive Ethernet interface, built-in IP protocol stack, easily forms a local area network, realizes full network reverse control, has a simple workstation interface, and powerful data processing functions.

3、 Instrument parameters

Working conditions:
Working environment temperature: 5～35℃
Working environment humidity: ≤ 85%
Working voltage: 220V 50Hz/60Hz
Temperature control area: 8-way independent temperature control system with automatic temperature protection function, can set independent small column box heating zone column box, gasification chamber, detector
Temperature range: Room temperature+5 ℃~450 ℃
Program heating rate: 0.1-40 ℃/min
Intelligent rear door: infinitely adjustable air flow in and out
Program heating order: 16 orders (expandable)
Injection modes: capillary column split/non split injection system (with diaphragm blowing function), packed column injection system, valve injection, gas/liquid automatic injection system, etc
Injection ports: 1-4, with a maximum of 3 capillary column injection ports. Split ratio: 1:999
Injection valve: can be equipped with multiple imported automatic control valves, and can operate automatically in sequence

Detector type:
The hydrogen flame detector (FID) has advantages such as automatic ignition function, automatic gas cut-off protection function, unique ceramic nozzle, and logarithmic amplifier design
Thermal conductivity detector (TCD) micro cell thermal conductivity detector has the advantages of small dead volume and higher accuracy
The advantages of small volume cell design, stability, safety and reliability, and multi gear adjustment of electron capture detector (ECD)
The advantages of flame photometric detector (FPD) include fully passivated internal pipelines, no cold spots for organic phosphorus, and digital high-pressure settings. Nitrogen phosphorus detector (NPD) has high sensitivity, strong selectivity, and a wide linear range

4、 Method flowchart




Five Instrument configuration:

Number, Name, Specification, Model, Quantity/Unit
1
One gas chromatograph host
1 set of FID detector
One set of capillary column gasification chamber with/without diversion
One set of non diversion packed column gasification chamber
Imported FFAP quartz capillary column with a size of 50m × 0.25mm × 0.3um, one chromatographic column
Imported 10% methyl silicone SCC stainless steel column, 1.0m × 3.0mm 1 piece
3. One set of VICI imported high-temperature resistant automatic six way valve for sample injector
1 set of calibration standard samples for 4 standard liquid instruments
Self provided standard samples of benzene and toluene in gasoline
Internal standard: 4-methylpentanone self prepared
1 set of Chinese anti control workstation for 5 workstations
6 spare parts including installation tools, 1 set of consumables
7 gas source nitrogen gas cylinder 99.999% or above 1 cylinder
1 hydrogen generator
1 air generator
8 Computer Business Computer


Gas chromatograph chromatogram for gasoline sample analysis: Analysis scheme for determination of benzene and toluene content in gasoline




Installation requirements for gas chromatograph:
Carrier gas
To ensure the accurate and reliable operation of the chromatograph, the carrier gas requirements for the sample are as follows:
1) Select a suitable sample carrier gas based on the gas characteristics of this project and the working characteristics of the chromatograph to ensure that the carrier gas does not mix with the sample gas
The components react chemically with the filler components of the chromatographic column, while not being dissolved or adsorbed by the stationary phase of the chromatographic column.
2) According to the gas characteristics and safety requirements of this project, inert gas should be used as the carrier gas. The supplier should provide practical experience proof of using inert gases as carrier gases in similar projects in the past.
3) The carrier gas provided by the supplier should be a standard gas, and its purity and stability should meet the working requirements of the chromatograph. At least 2 bottles of carrier gas should be provided during supply. Two bottles of carrier gas are operated in parallel, and automatic switching does not affect the normal operation of the analytical instrument. The supplier provides the components of the carrier gas