Heavy hydrocarbon of Petrorefining Nik Yazd

Heavy hydrocarbon with code 64742-48-9 is one of the products of Petrorefining Nik Yazd company, which is produced for the consumers of this product using the up-to-date refinery facilities and with high quality. Heavy hydrocarbon can be used to produce gas oil, as fuel for diesel internal combustion engines, heating systems, domestic and industrial burners and lubricants.

hydrocarbonHeavy hydrocarbon | code 64742-48-9

The general specifications of heavy hydrocarbon of Petrorefining Nik Yazd with code 64742-48-9 are briefly stated in the table below, which will be followed by more comprehensive explanations about the parameters

parameter Unite International Standard National Standard
Distillation °C ASTM D86 INSO 6261
Density kg/m3 ASTM D1298 INSO 197
Color number ASTM D1500 INSO 203
Mercaptan ppm ASTM D3227 INSO 9379
 Cetane number number ASTM D4737 INSO 8525
Corrosiveness to Copper ۳ h@50°C ASTM D130 ISIRI 336
Pour point °C ASTM D97 INSO 201
 Flash point (closed Cup) °C ASTM D93 INSO 19695

Cetane index

Cetane index is one of the quality parameters of fuel combustion, which indicates the degree of smooth combustion and quality of diesel fuel. This index mainly depends on the chemical composition of the hydrocarbons that make it and is calculated based on the combustion quality of two base hydrocarbons, namely normal cetane and alpha-methyl naphthalene. According to the standard, the cetane number can be in the range of 45-55, which is the result of the investigation on the cetane index of heavy naphtha of Petrorefining Nik Yazd, which is 50, indicating the quality of this product.


The simplest and most common method of separation for two or more liquids with different boiling points is distillation. The method used by Petrorefining Nik Yazd company for separating complex components of South Pars gas condensates to produce heavy hydrocarbons is vacuum distillation, in which evaporation begins when the pressure drops and reaches the vapor pressure of the solution at a low temperature. In the distillation range, two boiling points, initial boiling point or lowest boiling point (IBP) and final boiling point or highest boiling point (FBP), are very important in terms of pricing; which are the final results of this test for heavy hydrocarbon of Petrorefining Nik Yazd with code 64742-48-9 as follows.

IBP :143 °C
FBP: 331 °C

These boiling points should have an IBP of at least 140 and an FBP of maximum 339 according to the standard, which indicates the high quality of the produced heavy naphtha.


The density of a substance is its mass per unit volume at 15 degrees Celsius, which is expressed in the standard unit of kilograms per cubic meter. One of the indicators of quality assessment of heavy hydrocarbon is its density. According to the standardization, the density of heavy hydrocarbon can be up to 805 kilograms per cubic meter. The result of the test performed on the density of heavy hydrocarbon of Petrorefining Nik Yazd at 15 degrees Celsius is 798 kilograms per cubic meter, which indicates its high quality and has been one of the factors influencing the satisfaction of its buyers.

Flash point

Flash point is one of the basic indicators for controlling the flammability of materials, which is the temperature at which an oil product in atmospheric pressure, using an ignition source, causes instantaneous flame of the vapors resulting from the material. This should be given more attention in maritime transport. The flash point of heavy hydrocarbon of Petrorefining Nik Yazd has been measured by the closed cup method, which is 43 degrees Celsius. As a standard, this number can be between 40-50 degrees Celsius for heavy hydrocarbon.

Pour point

The pour point of an oil compound is the lowest temperature at which the sample can be effective for a specific purpose. When the oil sample is cooled without shaking, we reach a temperature at which crystals begin to form, which causes turbidity in the sample, which is called the cloud point. By continuing to cool, we reach a temperature at which if we place the test tube horizontally, the sample no longer moves and does not pour, which is called the pour point. Now if we gently heat the test tube, a moment comes when the sample regains its fluidity in the tube, the temperature related to this change of state is called the flow point. The flow point temperature is often a few degrees higher than the pour point temperature of the sample. The pour point index is one of the important indicators in storage and transportation, especially in cold regions. According to the standard, the pour point of heavy hydrocarbon should be less than -30 degrees Celsius. The test result on the pour point of heavy hydrocarbon of Petrorefining Nik Yazd is less than -30 degrees, which indicates that it also has storage conditions in cold regions.

Heavy hydrocarbon paint

The color of oil products is considered a very important quality parameter, because this parameter is an indicator of the degree of purity and this is important because it is easily observed by the buyer, which is one of the positive points of heavy hydrocarbon of Petrorefining Nik Yazd company. The color number of heavy hydrocarbon according to the standard is in the range of (1-2). According to the announced result, the color number of heavy hydrocarbon of Petrorefining Nik Yazd is 1.5, which indicates the very high quality of the product.

Corrosiveness to Copper

Copper strip corrosion test for petroleum products such as jet fuel, motor gasoline and other hydrocarbons that have a vapor pressure of less than 18 psi can be performed, which indicates the corrosiveness of petroleum products. This parameter is measured at 50 degrees Celsius and ranges from 1a (lowest corrosion) to 4c (highest corrosion), which is announced according to the following figure. The test result on the product of heavy hydrocarbon of Petrorefining Nik Yazd with code 64742-48-9 at 50 degrees Celsius is a1.


Mercaptan sulfur has an unpleasant odor and an incompatibility effect with the elastomers of the fuel system and is corrosive to the fuel system components. Also, the presence of mercaptan in the final product reduces the quality of the final product. Due to the high level of mercaptan in South Pars gas condensates and the emission of unpleasant odor during land transportation and during the distillation process and creating environmental problems, Petrorefining Nik Yazd company has established a mercaptan conversion unit in Pars Special Economic Energy Zone (Asaluyeh) to protect the natural and human environment.

Therefore, the feed required for refining, after performing the activities related to mercaptan conversion and removing the unpleasant odor from the hydrocarbon components in Asaluyeh site, is transferred to the main unit in Yazd. The maximum amount of mercaptan in heavy hydrocarbon can be 200 ppm. The test report for heavy hydrocarbon of Petrorefining Nik Yazd is 143 ppm. All the parameters mentioned indicate that the product of heavy hydrocarbon produced by Petrorefining Nik Yazd company has a high quality and can be used for the intended purposes.

Petro Palayesh Nik Yazd Company has the ability to produce by distillation and combination methods, but the attached analysis is the result of distillation and cutting of the gas condensate from South Pars.

Heavy hydrocarbons with high boiling point are suitable for diesel engines, heavy fuels, household and industrial burners.

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