Liquid Nitrogen Cryogenic Vapor Condensation Recovery System

How Cryogenic Recovery Works

The principle is straightforward: as gas temperature drops, vapour pressure drops with it. Pass a VOC-laden stream through a series of cold heat exchangers cooled by boiling liquid nitrogen at −196 °C, and the volatile components condense — first to liquid, then to solid — leaving a clean gas to vent.

Ever-power’s design uses a separate, sealed nitrogen circuit so the LN2 never contacts the process stream. This means recovered solvent is uncontaminated by nitrogen, and the warmed gaseous nitrogen leaving the cold-box is clean enough for downstream blanketing, purging or pressure transfer — effectively giving the operator two utilities from one consumable.

Multi-Stage Condensation

Three-stage cooling profile — pre-cooler (~+5 °C), intermediate stage (~−40 °C) and deep cryogenic stage (down to −130 °C). This staged approach cuts total LN2 duty by 12–16% versus a single-stage equivalent and prevents premature freeze-out at the inlet.

Finned-Coil Cryogenic Exchangers

Engineered finned-coil heat exchangers with internal flow conditioners maximise surface area and enable rapid response to flow-rate peaks — essential when batch processes generate spiky vent streams.

Sealed Nitrogen Circuit

LN2 boils inside a separate pressurised circuit and never touches the VOC stream. Recovered solvent is uncontaminated; warmed gaseous nitrogen exits clean and is immediately usable for blanketing, purging and pressure transfer.

High Automation

PLC-driven LN2 injection control matches outlet temperature to the target ppm specification automatically — consistent compliance even with feed concentration swings, and minimal operator intervention.

Multi-Solvent Capability

A single cryogenic skid can address mixed-solvent streams — alcohols, ketones, halogenated hydrocarbons, BTEX and aromatics — without the bed-replacement cost of activated carbon.

Environmental Reporting

Integrated carbon-emission monitoring and energy-saving instrumentation feed your NGER and Scope 1/2 reports directly — the data is captured, not retrofitted.

Process & Cryogenic Engineering Under One Roof

Heat-transfer modelling, two-phase flow analysis, ATEX zoning and PLC programming are all in-house — no sub-contracting risk on a system where the cold-box and the controls have to work as one.

Recovered Solvent ROI Modelling

We will model the payback case based on your real solvent purchase price, vent rate and operating hours. For high-value streams, the LN2 cost is regularly offset within 18–36 months.

Australian LN2 Supply Networks

Designs are pre-aligned with major Australian industrial gas supply networks for predictable LN2 delivery to metro and regional sites alike.

Sustainability Story for Your Board

No combustion, no NOx, no SOx, recovered product reused on site — we provide the carbon-equivalent saving calculation for ESG and NGER reporting.

Pharmaceutical API Plant Cryogenic Recovery

Location: Melbourne, Victoria  |  Year: 2024

An API manufacturer was burning roughly 180 tonnes per year of recoverable methanol and ethyl acetate in an RTO. Ever-power supplied a three-stage LN2 cryogenic skid that captured 96.4% of the solvent for direct reuse in the process, eliminated the RTO fuel-gas cost and cut Scope 1 emissions by approximately 540 tCO₂e per year.

Outcome: Project payback achieved at 22 months. EPA Victoria licence updated to reflect new emission profile.

WA Petrol Terminal Vapour Recovery

Location: Perth, Western Australia  |  Year: 2025

A truck loading rack vent stream of approximately 2,400 Nm³/h was treated with a two-stage cryogenic recovery skid. Recovered hydrocarbon was returned to the storage tanks, and outlet VOC was held below 5 mg/Nm³ across full loading and idle conditions.

Outcome: Estimated 240 tonnes/year of petrol fraction returned to inventory. Compliance with the site’s revised air-emission licence achieved at first audit.

Q1. When does cryogenic recovery beat thermal oxidation economically?
When the solvent has a meaningful purchase value (typically above AUD 1,500 per tonne) and the vent is concentrated (above ~50 g/Nm³), recovered solvent value plus avoided fuel-gas cost commonly delivers payback within 18–36 months.

Q2. What outlet VOC concentration can be achieved?
With three-stage condensation reaching −130 °C, outlet concentrations of single-digit ppm are achievable for most VOCs, comfortably below typical Australian state EPA emission licence limits.

Q3. Is the system safe for highly flammable streams?
Yes — arguably safer than carbon adsorption or thermal oxidation. The process is inerted by gaseous nitrogen and contains no ignition source, so the unit can be installed inside ATEX classified areas.

Q4. How much liquid nitrogen is consumed?
Typical specific consumption is 0.5–2 kg LN2 per kg VOC condensed, depending on inlet concentration and outlet ppm target. Warmed nitrogen exits clean and is normally reused for blanketing, slashing the net cost.

Q5. Can you handle mixed solvent streams?
Yes — multi-stage condenser design naturally separates components by dew point, and recovered solvent can be returned as a mixture or further fractionated. The heat-transfer profile is tailored to each customer’s solvent matrix.

Q6. What is the typical footprint?
For 1,000–2,000 Nm³/h flows, the skid typically occupies 6 m × 4 m at grade with an 8–12 m vertical envelope. A 3D plot plan is provided during FEED to confirm fit at your site.

Q7. How does the system contribute to NGER and ESG reporting?
No combustion means no Scope 1 stack emissions from the abatement device itself. Recovered solvent reduces purchasing and indirectly cuts Scope 3. Each project includes a CO₂-equivalent calculation pack ready to drop into your sustainability report.

Request Recovery ROI Model
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