Typical pollutants from petroleum refineries Which combination best represents the principal air pollutants commonly emitted from petroleum refinery operations?
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ACO, SO₂ & H₂S.
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BCO₂, NO & SO₃.
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CCO₂, H₂S & NO₂.
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DSO₃, NO₂ & CO₂.
Answer
Correct Answer: CO, SO₂ & H₂S.
Explanation
Introduction / Context: Refineries process sulfur-containing crude and operate numerous combustion units and process vents. Understanding typical pollutant profiles informs monitoring, permitting, and control technology selection.
Given Data / Assumptions:
- We focus on common, impactful pollutants.
- Emissions arise from heaters, boilers, FCC units, flares, and sour gas handling.
Concept / Approach: Carbon monoxide (CO) is produced by incomplete combustion. Sulphur dioxide (SO₂) forms when sulfur in fuels or off-gases is oxidized. Hydrogen sulfide (H₂S) occurs in sour refinery streams and may be released if not fully captured/converted (e.g., via amine treating and Claus units). While CO₂ is ubiquitous, it is not typically grouped with “criteria pollutants” in classic MCQs; nitrogen oxide speciation as NO vs NO₂ varies, and SO₃ is a minor fraction compared to SO₂.
Step-by-Step Solution:
Identify incomplete combustion → CO emissions.Link sulfur to SO₂; sour streams to H₂S.Select the triplet that best matches refinery pollutant fingerprints: CO, SO₂, H₂S.Verification / Alternative check: Emission inventories show significant SO₂ from sulfur-bearing fuels and CO from heaters/flares; H₂S is a key hazard in sour gas systems.
Why Other Options Are Wrong:
CO₂, NO, SO₃ / CO₂, H₂S, NO₂ / SO₃, NO₂, CO₂: Either overemphasize CO₂ (a greenhouse gas rather than a classical “pollutant set” here) or include SO₃ as a primary, which is typically a much smaller fraction than SO₂.Common Pitfalls: Assuming NO or NO₂ dominate over sulfur species in sour operations; sulfur control is a central refinery environmental challenge.
Final Answer: CO, SO₂ & H₂S.