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TagsChemical Process Engineering Gases Natural Gas Ethylene Cracking (Chemistry)
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Lummus Technology’s proprietary ethylene process

is the most widely applied process for the produc-

tion of polymer-grade ethylene and propylene. The

process is noted for its performance, including

product yield and energy efficiency; low invest-

ment cost; and operating reliability. Plant owners

have selected this technology for more than 200

projects, accounting for about 40% of worldwide

ethylene capacity. Lummus’ experience encom-

passes plants designed for ethylene capacities up

to 1,350,000 MTA, and feedstocks from ethane

through gasoils.

The high capacity SRT® pyrolysis furnace module is

designed for short residence time and low pressure

drop. The latest-generation SRT VII cracking coil

provides maximum performance for all feedstocks

and results in an easy-to-operate and robust

mechanical design. The patented, close-coupled,

single stage Quick Quencher transfer line exchanger

(TLE) offers significant operating and cost advan-

tages over competing designs.

The new, energy-efficient olefins recovery system

minimizes capital investment by reducing the

number of compressor casings by 40% and elimi-


nating up to 25% of the equipment pieces used in a

conventional system. Its key features are a low

pressure chilling train that operates at less than half

the operating pressure of a conventional flow

scheme, and the tertiary refrigeration system that

produces refrigeration from 40°C to -140°C in a single

refrigeration system. The lower piece count also

reduces maintenance costs and improves reliability.

The CDHydro(1) process, which combines reaction

and distillation in a single vessel, is utilized for

separate C3 and C4 acetylene/diene hydrogenation.

The combined acetylene/diene hydrogenation of

the C2 through C5 fraction can be accomplished

using Front End CDHydro, which has the added

benefit of removing up to 35% of the pyrolysis

hydrogen by chemical reaction instead of by

cryogenic separation, thereby reducing energy


Lummus’ design approach emphasizes reliability,

ease of operation, and broad feed flexibility at

competitive costs. All plants meet designed capac-

ity and exceed guaranteed performance. Average

on-stream time is above 98%, except in turnaround

years where it is above 96%.

Process Features

SRT pyrolysis module

Gas turbine integration

Quick Quencher TLE

TLE decoking technology

Heavy Oil Processing System

Low pressure chilling train

CDHydro process for
acetylene/diene hydrogenation

Tertiary refrigeration

Integration with energy-neutral
metathesis processes

Process Benefits

High olefins yields • High thermal efficiency • Long run-length • Reliable
operation • Low investment • Feed flexibility

Energy efficiency

Low pressure drop and residence time result in minimum yield degradation •
Lower cost

Less maintenance • Longer tube life • Reduced emissions

Ability to crack heavy natural gas liquids • Eliminate feed contaminants •
Low investment

Energy efficient • Low investment • High reliability • Reduced maintenance

High selectivity • Low cost • Operating ease • Minimizes green oil production
• Lower energy consumption

Mixed refrigeration system lowers investment • Simpler to maintain •
Higher reliability

Provides product flexibility • Upgrades lower-value olefins to higher-value


1) CDHydro is a registered trademark of CDTECH, a partnership between Lummus Technology,
a CB&I company, and Chemical Research & Licensing, a CRI company

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