The VOC Emission Control Problem: Destroy It or Recover It

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Why industrial VOC emissions are an economic loss before a compliance one, the two ways to control them, and the three families of control technology: oxidation, reactive absorption and physical recovery.

Assess Your Vent Losses

01 · The VOC Emission Control Problem

An economic loss before it's a compliance one

Industrial VOC emissions contribute to air pollution, resource loss, and increasing environmental pressure. Regulators — CPCB and the State Pollution Control Boards in India, and strict regimes in Europe, the US and Japan — increasingly encourage recovery, sustainability, and efficient resource utilisation rather than simple destruction.

Recovering solvents improves both environmental performance and operating economics at once: every kilogram of solvent captured is a kilogram that doesn't need to be purchased, burned, or accounted for as a compliance cost.

The scale of the problem

Some sources emit a single solvent at modest concentration; others — gravure printing lines, paint shops, flexible-packaging plants — emit mixtures of up to six solvents at once, at flows from a few hundred to 200,000 Nm³/hr.

200,000

Nm³/hr max flow

6

Solvents simultaneously

<100

Nm³/hr minimum

Two approaches to the problem

1.

Process modification

Changing or modifying the process chemistry and processing steps to reduce VOC generation at source.

2.

End-of-pipeline treatment

Treating the exhaust stream after it leaves the process to meet emission standards without changing the upstream chemistry.

End-of-pipeline: two types

Destruction — converts pollutants to CO₂ / water to meet compliance. Nothing is recovered.

Recovery & recycle

Returns pollutants to the process or recovers them for use elsewhere — turning a liability into an asset.

Three broad technology categories

1 · Oxidation systems

Thermal or catalytic. Destroys 98% or more of the VOC, but adds CO₂ / GHG output, needs supplemental fuel (NG or LPG) on lean streams and leaves nothing to recover.

Recovery vs thermal oxidation →

2 · Reactive absorption

Converts pollutants into a saleable or disposable compound via liquid-phase reaction. Examples: formaldehyde → urea pre-condensates; H₂S / SO₂ → caustic soda; NOx → ammonia. Can reach non-detectable emission levels, but is chemistry-specific rather than general-purpose.

3 · Physical systems

Our approach

Capture VOCs without destroying or chemically altering them. A high-boiling absorbent dissolves VOC from the gas stream, then releases it in a stripping step for condensation and reuse.

Enables recovery. Runs at lower energy cost. Works across a broad range of chemistries.

Absorption vs refrigeration vs adsorption →