Risk assessment and risk reduction of an acrylonitrile production plant

Sano, Kazuhiko; Koshiba, Yusuke; Ohtani, Hideo

doi:10.1016/j.jlp.2019.104015

Cited by 16 publications

(13 citation statements)

References 25 publications

(22 reference statements)

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“…The primary root cause of each situation could be determined using the information in Table . There were 14 incidents that comprised the A, B, C, E, and F situations that were the primary cause of each incident to be used in determining the situations’ likelihood and severity. , …”

Section: Resultsmentioning

confidence: 99%

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Dust Explosion Risk Assessment of Extruded Food Production Process by Fault Tree Analysis

Pahasup-anan

Kreetachat

Ruengphrathuengsuka

et al. 2021

ACS Chem. Health Saf.

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Dust explosions in compressed food factories can cause severe injury and death as well as damage to assets. This research aimed to assess the risk of dust explosions using the Fault Tree Analysis (FTA) technique from grain extruded food production. The results showed that there were possible situations in which 14 dust explosions were generated at the belt-drying area of puffed food. Considering some fundamental factors, the primary reason for the most significant dust explosion risk is seen to be welding/cutting operations. These processes create a source of ignition or heat in the environment. Therefore, an extruded food production factory should train welding and metal cutting to prevent dust explosions. Moreover, a flameless venting device and an explosion suppression detector should be installed in dust collectors. The FTA method demonstrated the risk of a dust explosion caused by machinery and equipment that must be reduced and controlled to an acceptable level to prevent the occurrence of dust explosions, which has a serious impact on occupational health assets and the environment.

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Section: Resultsmentioning

confidence: 99%

“…The primary cause for the highest risk of dust explosion, an unacceptable risk, was the welding/cutting operation. This operation causes a spark or heat in the production zone …”

Section: Discussionmentioning

confidence: 99%

Dust Explosion Risk Assessment of Extruded Food Production Process by Fault Tree Analysis

Pahasup-anan

Kreetachat

Ruengphrathuengsuka

et al. 2021

ACS Chem. Health Saf.

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“…An ESD is designed to prevent accidents arising from the use of the FBRS. This necessitates coping with all accidents associated with the system, such as a fire, an explosion, or destruction (Sano et al, 2020) . Catalyst deactivation causing economic losses can also be defined as an accident, as a phenomenon that leads to fires and explosions.…”

Section: Esd Designmentioning

confidence: 99%

“…There are also a few reports on accidents in fluidized bed reactors. Sano et al (2020) reported accident cases in FBRS, demonstrating that abnormalities can be classified as either "accidents/disasters" or "incidents." Accidents and disasters include events such as explosions, fires, and pressure abnormalities.…”

Section: Introductionmentioning

confidence: 99%

Emergency shutdown of fluidized bed reaction systems

Sano

Koshiba

Ohtani

2020

Journal of Loss Prevention in the Process Industries

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“…Thus, O 2 gas is frequently used in chemical processes such as acetaldehyde production (known as the Wacker process) 2 and acrylonitrile production (ammoxidation, also known as the SOHIO process). 3 Similar to O 2 , nitrous oxide (N 2 O; CAS RN: 10024-97-2) is used as an oxidizer in chemical processes. The advantages of using N 2 O lie in the fact that (i) N 2 O containing ca.…”

Section: Introductionmentioning

confidence: 99%

Upper and Lower Flammability Limits, Limit N₂O Concentrations, and Minimum Inerting Concentrations of n-Alkane–N₂O–Diluent Mixtures: An Experimental and Computational Study

Koshiba

Asano

2023

ACS Chem. Health Saf.

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Objectives: N2O is widely used in the chemical industry and laboratories; however, several fire/explosion accidents have been reported in facilities that handle N2O. This study aimed (i) to experimentally investigate the lower and upper flammability limits (LFL and UFL, respectively), limit nitrous oxide concentration (LN2OC), and minimum inerting concentrations (MICs) of fuel–N2O–diluent mixtures and (ii) to computationally estimate the UFLs of fuel–N2O–diluent mixtures. Methods: Herein, methane and n-propane and nitrogen (N2), argon (Ar), and carbon dioxide (CO2) were used as fuels and diluents, respectively. The LFL, UFL, LN2OC, and MICs of the fuel–N2O–diluent mixtures were experimentally determined using a closed cylindrical vessel, and their UFLs were computationally estimated based on the laws of conservation energy and mass and adiabatic flame temperatures. Results: Flammability-limit experiments revealed the following: (i) the LFLs of the CH4–N2O–diluent and C3H8–N2O–diluent mixtures were 2.5 and 1.4 vol %, respectively, (ii) the UFLs of the CH4–N2O–diluent and C3H8–N2O–diluent mixtures were 40.5 and 24.0 vol %, respectively, (iii) a nearly linear relationship between the UFL and diluent concentration was found, and (iv) the order of MICs in N2O atmosphere was consistent with the inerting ability of the diluents. Calculations based on overall combustion reactions and the laws of energy and mass conservation using six and five chemicals successfully estimated the UFLs of the CH4–N2O–diluent and C3H8–N2O–diluent mixtures with mean absolute percentage errors of ≤2.8% and ≤4.1%, respectively. Conclusions: The semiempirical model suggested herein allows accurate estimation of the UFLs of the tested fuel–N2O–diluent mixtures. These findings would contribute to reducing accident-induced losses in the chemical industry and laboratories handling N2O.

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Risk assessment and risk reduction of an acrylonitrile production plant

Cited by 16 publications

References 25 publications

Dust Explosion Risk Assessment of Extruded Food Production Process by Fault Tree Analysis

Dust Explosion Risk Assessment of Extruded Food Production Process by Fault Tree Analysis

Emergency shutdown of fluidized bed reaction systems

Upper and Lower Flammability Limits, Limit N₂O Concentrations, and Minimum Inerting Concentrations of n-Alkane–N₂O–Diluent Mixtures: An Experimental and Computational Study

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Risk assessment and risk reduction of an acrylonitrile production plant

Cited by 16 publications

References 25 publications

Dust Explosion Risk Assessment of Extruded Food Production Process by Fault Tree Analysis

Dust Explosion Risk Assessment of Extruded Food Production Process by Fault Tree Analysis

Emergency shutdown of fluidized bed reaction systems

Upper and Lower Flammability Limits, Limit N2O Concentrations, and Minimum Inerting Concentrations of n-Alkane–N2O–Diluent Mixtures: An Experimental and Computational Study

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Product

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Upper and Lower Flammability Limits, Limit N₂O Concentrations, and Minimum Inerting Concentrations of n-Alkane–N₂O–Diluent Mixtures: An Experimental and Computational Study