Parr 1108 High-Strength Oxygen Combustion Bomb
342 mL stainless steel pressure vessel rated to 20 MPa operating at 3.0 MPa pure O_2 for complete sample combustion.
Chemical & Process Engineering / Oxygen Bomb Calorimetry
FREE TO EXPLORELABORATORY 35 · CHEMICAL & PROCESS ENGINEERING
Oxygen Bomb Calorimetry & Standard Heat of Combustion of Organic Process Hydrocarbons
Operate an isoperibol oxygen bomb calorimeter pressurized to 3.0 MPa with pure O_2, measure the corrected adiabatic temperature rise ΔT_c resulting from complete combustion of standardized benzoic acid and liquid process hydrocarbon pellets (0.40 to 1.40 g), calibrate the effective calorimeter energy equivalent W_cal, and evaluate the specific combustion thermometric slope. Explore interactive transport phenomena, unit operations simulation, and chemical engineering telemetry.
TRANSPORT PHENOMENA · UNIT OPERATIONS · PROCESS CONTROL · REACTION ENGINEERING
Your virtual chemical and process engineering laboratory.
CORRECTED CALORIMETER TEMPERATURE RISE ΔT_C—
PROCESS & PILOT PLANT TELEMETRY
Ready to sample with Sample Mass m_s = 0.8 g.
Adjust Sample Mass m_s, then execute chemical process trial.
Chemical and process engineering telemetry is evaluated rigorously using 64-bit IEEE 754 precision. Residuals reflect ordinary least-squares regression across successive observations. Continuous data structures support high-fidelity transport phenomena and unit operations modeling.
Process engineering assumptions and boundary condition limits
The transport and thermodynamic models apply within the specified calibrated operating window (0.4 to 1.4 g). Evaluated using a Parr 6200 isoperibol oxygen bomb calorimeter with Parr 1108 high-strength stainless steel bomb and precision digital thermistor thermometer (±0.0001 °C resolution). Standardized against NIST SRM 39j benzoic acid (-Δu_c = 26.434 ± 0.003 kJ/g).
Process apparatus & industrial sensors.
Thermostatically Controlled Isoperibol Water Jacket
Maintains jacket temperature constant at 25.000 ± 0.005 °C to establish stable radiative boundary conditions.
Precision Electronic Thermistor Thermometer
Measures calorimeter bucket water temperature with 0.0001 °C resolution and zero thermal drift.
High-Pressure Oxygen Charging Regulator & Manifold
Safely charges bomb with ultra-pure O_2 (99.99%) to exactly 3.00 ± 0.05 MPa without disturbing sample powder.
Electronic Capacitive Ignition Unit
Delivers a 10 cm loop of Ni-Cr fuse wire exactly 23 J of electrical energy to initiate combustion.
Pellet Press & Analytical Microbalance
Compacts powder samples into cohesive pellets weighed to 0.0001 g to prevent splattering during deflagration.
FOLLOW THE METHOD
A reason behind every step.
Operate an isoperibol oxygen bomb calorimeter pressurized to 3.0 MPa with pure O_2, measure the corrected adiabatic temperature rise ΔT_c resulting from complete combustion of standardized benzoic acid and liquid process hydrocarbon pellets (0.40 to 1.40 g), calibrate the effective calorimeter energy equivalent W_cal, and evaluate the specific combustion thermometric slope. Standardized parameter settings: 0.4, 0.6, 0.8, 1.0, 1.2, 1.4 g.
01
Calorimeter Jacket Thermal Stabilization
Turn on the isoperibol jacket circulating bath at 25.00 °C; verify temperature stability within ±0.005 °C for 30 minutes.
02
Pellet Preparation & Fuse Attachment
Compress benzoic acid into a cohesive pellet (0.4000 g); mount in the fuel capsule and connect 10 cm of Ni-Cr fuse wire touching the pellet top.
03
Deionized Water Charge & Bomb Sealing
Add 1.0 mL of DI water to the bomb cylinder base to absorb nitric acid; assemble screw cap with sealing ring hand-tight.
04
Oxygen Purge & Pressurization
Connect charging manifold; purge residual air for 15 s, then pressurize slowly to 3.00 MPa O_2; submerge in water bath to verify leak-tightness.
05
Bucket Installation & Pre-Period Logging
Place bomb in calorimeter bucket containing exactly 2000.0 g DI water; start stirrer motor and record pre-period temperatures for 5 minutes.
06
Ignition, Post-Period & Regnault–Pfaundler Correction
Fire electronic ignition; record temperature rise through reaction period and post-period; compute Regnault–Pfaundler ΔT_c and repeat for masses up to 1.40 g.
YOUR NOTEBOOK · 0 OBSERVATIONS
Turn measurements into chemical process engineering insight.
Points are your recorded observations. The solid regression line validates Oxygen Bomb Calorimetry mathematical scaling.
LINEAR REGRESSION FIT · y = mx + b
ΔT_c = S · m_s = 2.6500 · m_s
| # | Combustion Sample Mass m_s (g) | Corrected Calorimeter Temperature Rise ΔT_c (°C) | Sample pellet mass m_s (g) | Corrected temperature rise ΔT_c (°C) | Remove |
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CHECK YOUR UNDERSTANDING
Explain what the process engineering metrics mean.
In bomb calorimetry, the measured combustion reaction occurs under which thermodynamic condition?
The certified specific heat of combustion of standard NIST benzoic acid is approximately:
The Regnault–Pfaundler radiation correction is applied to:
The relationship between ΔH_c and ΔU_c for an organic fuel combustion reaction is:
THEORY AND UNIT OPERATIONS CONTEXT
Process engineering background & physical principles.
Oxygen bomb calorimetry is the gold standard thermochemical method in chemical, petroleum, and energy engineering for determining standard gross heats of combustion (higher heating values, HHV), internal energies of reaction (ΔU_c^°), and standard enthalpies of formation (ΔH_f^°) of fuels, polymers, foodstocks, and chemical feedstocks. In an isoperibol oxygen bomb calorimeter, a known mass of combustible sample is ignited electrically inside a thick-walled, high-strength stainless steel pressure vessel (bomb) charged with excess pure oxygen gas at 3.0 MPa (30 bar). Complete combustion transforms organic carbon, hydrogen, and oxygen exclusively into gaseous CO_2 and condensed liquid H_2O: C_a H_b O_c (s) + (a + b/4 - c/2) O_2 (g) -> a CO_2 (g) + (b/2) H_2O (l). The bomb is submerged in a precisely weighed bucket of deionized water (2000.0 g) enclosed within a thermostatically jacketed isoperibol air space. Heat released by combustion transfers through the bomb walls into the surrounding water and calorimeter hardware, inducing a temperature rise of 1 to 4 °C. Because the calorimeter is not perfectly adiabatic, heat exchange with the constant-temperature jacket occurs during the rating periods. The Regnault–Pfaundler radiation correction method accounts for this thermal leakage, yielding the corrected temperature rise ΔT_c. Applying the first law of thermodynamics to the closed constant-volume bomb system yields: -ΔU_c = W_cal · ΔT_c - e_fuse - e_acid, where W_cal is the energy equivalent (effective heat capacity) of the calorimeter system, e_fuse is the combustion energy of the nickel-chromium ignition wire, and e_acid is the thermochemical correction for nitric acid formed from residual nitrogen. Standardized benzoic acid pellets (certified gross heat of combustion -Δu_c = 26.434 kJ/g) are combusted across masses from 0.40 to 1.40 g to determine the specific combustion thermometric slope S = (-Δu_c) / W_cal = 2.6500 °C/g, validating the calorimeter energy equivalent W_cal = 9.975 kJ/°C (9975 J/K).
ΔT_c = S · m_s = 2.6500 · m_s
Evaluated using a Parr 6200 isoperibol oxygen bomb calorimeter with Parr 1108 high-strength stainless steel bomb and precision digital thermistor thermometer (±0.0001 °C resolution). Standardized against NIST SRM 39j benzoic acid (-Δu_c = 26.434 ± 0.003 kJ/g).