DIP - DRY ICE PRODUCTION
Aquila Triventek A/S · Industrivej 9 · DK-5580 Noerre Aaby · Tel. +45 70 22 12 92 · [email protected] · www.aquila-triventek.com 4
1 Introduction
We are pleased that you have chosen the Recovery Unit RE80 by Aquila Triventek A/S for your company. The recovery
RE80 is especially designed to be connected to the Aquila Triventek Dry Ice Pelletizer type PE80, and cannot be used for
other purpose.
This technology is the subject of a Patent application No. 0408224.4.
To obtain long and trouble-free operation of the equipment we recommend reading this manual carefully. All new opera-
tors of the equipment should also familiarize themselves with the content of this document.
1.1 What is Dry Ice?
Carbon dioxide is a chemical compound formed by combining one atom of carbon with two atoms of oxygen and is
expressed by the chemical symbol CO2. It can exist in three states: as gas, as liquid or as a solid.
Dry ice is frozen carbon dioxide (CO2). The unique property of carbon dioxide is that at normal, atmospheric pressure
and temperature, it changes state directly from solid to gas without going through a liquid phase.
This process, called sublimation, makes the ice ‘dry’ and is exploited both for blast cleaning and for cooling. Dry ice
isstableat(minus)-79C,atatmosphericpressure.Itexpandsupto800timesbyvolumewhenitsublimes,andthis
property is exploited in the blast cleaning application.
1.2 Recovery Unit
Normal dry ice production uses liquid CO2which when brought to normal atmospheric pressure, in e.g. a pelletizer
converts to one half snow and one half gas, called ‘revert’ gas. The snow is then compressed into dry-ice pellets.
But, by using the RE80 Recovery Unit, the revert gas, which is usually lost into atmosphere, is collected and recycled to
make more pellets. This becomes a continuous process and, as a result, will reduce production costs by up to 50%.
2 Safety
2.1 Safety data for carbon dioxide (CO2)
Hazardsidentication
Liquid carbon dioxide is stored in pressure vessels and must be handled according to the vessel manufacturers´ and the
carbon dioxide suppliers´ instructions.
1. Precautions must also be taken when mounting and dismounting the hose for liquid carbon dioxide. The liquid
may be under pressure and could spray into the surrounding area, forming dry ice and causing frostbite and eye
damage.
2. Be careful if a liquid CO2hose is blocked by dry ice. The pressure behind the dry ice blockage will rise due to evapo-
ration of liquid CO2. A powerful blast will occur when the blockage breaks. DO NOT dismount a hose if it is blocked,
or if it is suspected to be blocked by dry ice. Loosen the connection slightly so that gas can escape. Leave the hose
until the blockage is evaporated.
