- Carbon-Hydrogen Ratio & Calorific Values - A ready Reckoner - empowering field persons in plants

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- Carbon-Hydrogen Ratio  & Calorific Values - A ready Reckoner - empowering field persons in plants

Carbon - Hydrogen Ratio of petroleum products is of prime importance because of it provides a quick means of finding out the quality of same and suitability of use in various applications as feed to petrochemicals, fertilizer plants, energy production etc. C/H ratio as well as Calorific Value of petroleum products is dependent on specific gravity of products, a ready reckoner for field persons can be developed.  This empowers the plant operating persons since they don’t have to now depend upon the laboratory to get these values.  A simple print out pinned on information board gives immediately C/H ratio and Calorific Values only from density figure.

The Carbon Hydrogen ratio in hydrocarbons is indicative of the hydrogen richness or deficiency.
These properties are specifically important to Naphtha, a petroleum product similar to Gasoline with respect to hydrocarbon content. Broadly Naphtha is classified as light naphtha and heavy naphtha. Light Naphtha contain more hydrogen ( low C/H ratio and high Calorific Value per unit mass  ) and vice versa.  Light Naphtha is thus more useful for producing hydrogen for various use in fertilizer or in hydrogen dependent processes. Heavy naphtha contains more Aromatics and have high C/H ratio and low Calorific Value per unit mass.

Calorific Value or Heat Content of petroleum products is its measure of energy content and determined by various test methods like Bomb Calorimeter ASTM D -240, IP 12 in laboratory.  It’s estimated satisfactorily using ASTM D- 6446. An alternative method as Aniline Gravity Product is also very popular as per ASTM D-1405, IP 193. Another method ASTM D-3338, heat of combustion is calculated from Density, Aromatics and Distillation parameters.

The author here has simplified the technical issues with practical assumption of normal other elements like Sulphur, Nitrogen, moisture and other metallic impurities usually present in Naphtha and Residual Fuel Oil and prepared a ready reckoner which estimates C/H ratio and  Calorific Values (both Gross as well as Net) in Tabular as well as a Nomo graph  for field as well as laboratory use. This work is based on Indian Standard 1448 – P : 7 - Determination of Calorific values by Calculation.

Easy Convenient way of knowing Calorific Value and C/H ratio for Naphtha and Fuel Oil

Easy way to find calorific value and C/H ratio from density for Naphtha


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