UniChrom DHA - description

The automatic gas chromatographic system UniChrom-DHA for the detailed hydrocarbon analysis (DHA) of various petroleum fractions and products has been developed.
Samples of gasoline are analysed by temperature programmed gas chromatograph on a high-resolution capillary column which separates hydrocarbons in order of their boiling points. Individual components are identified comparing their Kovats or linear retention indices with a library of 330 components. Then all the major gasoline standardised specifications are calculated from the obtained DHA data.
As the result of single chromatographic petrol sample analysis (about 60 min) it is possible to determine the next certificate characteristics:

• Detailed hydrocarbon and fractions contents (ASTM D5134, GOST 6994 and ASTM D5580, GOST 8997 and GOST 2070),
• Contents of aromatic components ( GOST 6994 and ASTM 5580),
• Contents of olefin components ( GOST 8997 and 2070),
• Fractional content (GOST 2177 and ASTM D86),
• Detonation stability expressed in terms of research octane number RON (GOST 8226 and ASTM 2699),
• Detonation stability expressed in terms of motor octane number MON ( GOST 511 and ASTM 2700),
• Saturated valour pressure ( GOST 1756-52 and ASTM 2889),
• Density (GOST 3900 and ASTM 4052)

In April 2001 the Laboratory of Analytical Researches (LAR) of Institute of Nuclear Problems of the Belarus State University was accredited in Testing Laboratories State Quality Assurance System for independence and technical competence. Accreditation Attest Nr BY/112.02.1.0.0384. Registration date 09 April 2001. Certificate valid till 09 April 2004. For working period have carried over 50 petrol analysis related to petrol quality.
Laboratory of Analytical Researches is ready for taking DHA analysis and petrol quality determination.
In the case of Your company interest, LAR can supply with corresponding analytical equipment, methodical support and employee training.

Please see PowerPoint presentation about Detailed Hydrocarbon Analyser (file 2.5 Mb)

Detailed Hydrocabon Analyser can be directly ordered with chromatograph and all accessoiries

Fractional content curve obtained using DHA data. Each point represent the persentage of hydrocarbons boiled in specified temperature range.