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HomeNews Application of Potentiometric Titration in Determination of Mercaptan Sulfur Content in Oil

Application of Potentiometric Titration in Determination of Mercaptan Sulfur Content in Oil


1. What is mercaptan sulfur in oil?

Mercaptans are a class of non-aromatic compounds containing sulfhydryl functional groups (-SH). The structure is equivalent to the replacement of oxygen in alcohols by sulfur, such as ethanol (commonly known as alcohol) CH3CH2OH and ethyl mercaptan CH3CH2SH.

There are a small amount of mercaptan compounds in petroleum products. The presence of mercaptan not only causes the oil to have an unpleasant smell, but also transforms into toxic and corrosive sulfur dioxide and sulfur trioxide during combustion, which is harmful to the elastic materials of the fuel system. It also corrodes the components of the fuel system, affecting the life of related machinery, such as automobile engines. Therefore, it is very important to control the mercaptan content in petroleum products.

2. The sulfur contained in mercaptan in oil is called mercaptan sulfur content. National standards mandate the mercaptan sulfur content in a series of oil products such as gasoline, diesel, kerosene, distillate fuel, and jet fuel. So how to determine the content of mercaptan sulfur in oil?

. Use Potentiometric Titrator to determine mercaptan sulfur content in oil

(1) Instrument: REX ZDJ-5B Automatic Potentiometric Titrator

(2) Electrodes: 216 type silver Electrode and 231-01 type pH glass electrode.

(3) Reagents: ultrapure water, 1-butanethiol, 1-heptanethiol, potassium iodide, concentrated nitric acid, isopropanol, sodium acetate, sodium sulfide, silver nitrate, etc.

(4) Sample: commercial gasoline; butane mercaptan standard solution

(5) The measurement process is as follows:

Electrode pretreatment ----- Standard solution----- Blank titration----- Sample Measurment


² 7" colorful touchscreen and smart guide system.

² Titration methods, curves and results are displayed in detail.

² 1 extra burette driver can be installed (optional).

² Replaceable burette with high-accuracy (10 ml or 20 ml selectable).

² Intelligent operation system provides features including user management, method management, electrode management, titrant management, data management, etc.

² Support the following titration modes: DET (dynamic equivalence point titration), MET (monotone equivalence point titration), SET (Preset Endpoint Titration) and MAT (manual titration).

² pH calibration and measurement are supported.

² Up to 100 user-defined methods and 10 user-defined shortcuts.

² Auto calculation with pre-defined formula.

² Store up to 200 titration data sets (GLP-compliant).

² Data analysis feature helps user review, compare and recalculate results.

² Data can be easily transferred to printer via RS-232 communication interface..

² Titrator can be controlled by computer via USB or RS-232 communication interface.

² Automatic sampler is supported.

INESA Scientific Instrument Co., Ltd
Business Type:Manufacturer
Product Range:Clinical Analytical Instruments , Clinical Analytical Instruments , Moisture Meters
Products/Service:pH Meters , Conductivity Meter , Titrator , Turbidimeter , Magnetic Stirrer , Dissolved Oxygen Analyzer
Certificate:ISO9001 , CE , ISO14001
Company Address:No.5 Yuanda Road 201805 , Anting,Shang Hai, Shanghai, Shanghai, China

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