Coking value test method

Conradson Carbon Number ASTM D-189 Determination of the weight of nonvolatile residue formed after evaporation and atmospheric pyrolysis of fuel or oil. This test method provides some information about the relative coke-forming or deposit-forming tendency of a fuel or oil. Products having a high ash value will have an erroneously high carbon residue value. 

DI989 Standard Test Method for Gross Calorific Value of Coal and Coke by Microprocessor Controlled Isoperihol Calorimeters,... 

The standard test method for proximate analysis (ASTM D-3172) covers the methods of analysis associated with the proximate analysis of coal and coke and is, in fact, a combination of the determination of each of three of the properties and calculation of a fourth. Moisture, volatile matter, and ash are all determined by subjecting the coal to prescribed temperature levels for prescribed time intervals. The losses of weight are, by stipulation, due to loss of moisture and, at the higher temperature, loss of volatile matter. The residue remaining after ignition at the final temperature is called ash. Fixed carbon is the difference of these three values summed and subtracted from 100. In low-volatile materials such as coke and anthracite coal, the fixed-carbon value equates approximately to the elemental carbon content of the sample. 

ASTM D-2416. Standard Test Method for Coking Value of Tar and Pitch (Modified Conradson). 

Other test methods that are used for determining the coking value of tar and pitch (ASTM D-2416, ASTM D-4715), which indicates the relative coke-forming properties of tars and pitches, might also be applied to asphalt. Both test methods are applicable to tar and pitch with an ash content <0.5% (ASTM D-2415). The former test method (ASTM D-2416) gives results close to those obtained by the Conradson carbon residue test (ASTM D-189, IP 13). However, in the latter test method (ASTM D-4715), a sample is heated for a specified time at 550 10°C (1022 18°F) in an electric furnace. The percentage of residue is reported as the coking value. 

D 1989 (1995) Test method for gross calorific value of coal and coke by microprocessor controlled isoperibol calorimeters... 

D 2015 (1995) Test method for gross calorific value of coal and coke by the adiabatic bomb calorimeter D 2382 (1988) Test method for heat of combustion of hydrocarbon fuels by bomb calorimeter (high-precision method)... 

D 2766 (1995) Test method for specific heats of liquids and solids D 3286 (1991) Test method for gross calorific value of coal and coke by the isoperibol bomb calorimeter D 3350 (1999) Polyethylene Pipes and Fitting Materials D 3386 (1994) Test method for coefficient of linear thermal expansion of electrical insulating materials D 3417 (1999) Test method for heats of fusion and crystallization of polymers by thermal analysis D 3418 (1999) Test method for transition temperatures of polymers by thermal analysis... 

ASTM. 201 Ig. Test Method for Gross Calorific Value of Coal and Coke by the Adiabatic Bomb Calorimeter (ASTM D2015). Annual Book of ASTM Standards, Section 05.05. American Society for Testing and Materials, West Conshohocken, PA. 

Note 4—In diesel fuel, the presence of alkyl nitrates such as amyl nitrate, hexyl nitrate, or octyl nitrate causes a higher residue value tlum observed in untreated fuel, which can lead to erroneous conclusions as to the coke forming propensity of the fuel. The presence of alkyl nitrate in the fUel can be detected by Test Method D 4046. 

XI.3.2 As soon as sufficient sample has been forced into the coking bulb, remove and weigh ffie bulb and its contents and proceed as described in 9.3 of this test method. Remove the assembled apparatus from the oven as soon as possible as extended heating periods may alter the carbon residue value of the sample. 

A key factor in the suitabihty of cokes for graphite production is their isotropy as determined by the coefficient of thermal expansion. After the calcined coke was manufactured into graphite, the axial CTE values of the graphite test bars were determined using a capacitance bridge method over a temperature range of 25 to 100°C. The results are summarized in Table 24. Also included in the table are bulk density measurement of calcined cokes and the resistivity values of their graphites. 

There are no standard tests for measuring the onset of asphaltenes precipitation. Among the techniques and analytical methods frequently used to measure sediment and asphaltenes onset for the adjustment of different process parameters in the refineries are spot test (ASTM-D-4740-95) total sediment (ASTM-4870-96) solubility parameters, optical microscope light scattering (PORLA) peptization value (P-value) ° colloidal instability index (CII) coking index. ... 

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