Teledyne ISCO CO2 Technical Notes

CO2 Applications &

PTFE
washer

Nipple

Nut

Inline filter
frit assembly

Reducing
connector

To CO

2

Supply

To V a l v e
Inlet

Technical Notes

For Teledyne ISCO Syringe Pumps

Overview

Supercritical CO2 and its associated technologies are
being used in many applications to replace hazardous
solvents, lower costs, and improve efficiencies. Some of
the applications requiring a supercritical fluid pump
include:

● Carbon Sequestration Studies

● Supercritical Fluid Extraction (SFE)

● Supercritical Fluid Chromatography (SFC)

● Catalysis/Reaction Feed

● Injection molding and Extrusion

● Particle Formation

● Cleaning

● Electronic Chip Manufacturing

● Plastics Production

Teledyne ISCO Syringe Pumps are used in R&D and

production in many of these applications. Syringe
pumps are well-suited
at high pressures with great accuracy and reliability.

for use with CO2 and can operate

Syringe Pump Technical Bulletin

Sept 2020, TB08

Table 1: CO2 Cylinder Connection Package

Part Number Description

1

209-0161-63

209-0161-16

Reducing connector

1

1



4

"  2



2

" nipple
209-0161-15 0.830-14 nut
209-0161-17 PTFE washer
209-0161-64 In-line filter assembly

Figure 2: CO2 cylinder connection package



8

" to

1



4

"

CO2 Cylinder Connection

For North American gas tank connections, the
optional CO
available from Teledyne Isco.

CO

2

Figure 1: ISCO Pump and CO2 dip tube tank

with Isco temperature control jacket and circulating bath

connection package (part #68-1247-043) is

2

CO2 connection kit

T.C. Jacket

Dip tube

Circulating
bath

Syringe Pump

User-supplied

device

(Extruder
Reactor
Rock Core
Etc.)

Tips and Additional Equipment:

1. Dip Tube

An upright CO2 cylinder must be equipped with a dip
tube in order to pump a steady supply of liquid and not
gas. The dip tube is a piece of copper tubing plumbed
from the valve at the top of the tank to the bottom.

2. Temperature Control

To ensure a good fill, maintain the temperature in the
cylinder with the Isco temperature control jacket. The
temperature control jacket is useful in SFC applications
where cylinder cooling facilitates pump filling with
supercritical liquid CO
lating temperature-controlled bath (user supplied) to
keep the fluid inside the pump at a constant tempera­ture. This can be critical when operating at very low
flow rates (below 100 µl/min), where temperature fluctu­ation can cause flow variations.

Pump systems are available from Teledyne Isco with
the temperature control jacket already installed. For
existing systems, order the appropriate package for
your pump model. Refer to Technical Bulletin TB07 Tem-
perature Control Jacket for additional information about
installation and operation.

. The jacket is used with a circu-

2

Syringe Pump Technical Bulletin TB08

Note

Note

3. Valve Packages for Dual Pump Systems

A continuous flow system consists of two syringe
pumps and a valve package regulated by one controller.
This allows you to continuously deliver liquefied gas in
constant flow or constant pressure mode.

Teledyne ISCO has
three different types of
valve packages:

● Electric valves

● Air valves

● Manual valves

Electric valves, which pro­vide the best positive valve
closure, are the most com­monly used valves in
liquefied gas applications.
Electric valves require the
pump controller to be
equipped with the valve
driver board.

Air valves generally open and close faster and are
less prone to error and component wear, making them
suitable for industrial use and other applications where
the system will be constantly running; however they
require a user-supplied pressurized air source and spe­cial upgrade kit in order to operate with CO
wetted materials are CO

compatible.

2

Manual valves are used in lower-cost CO
tions where automation is not required.

For detailed installation and operation instructions,
refer to Technical Bulletin #1 Dual Pump Systems.

. All other

2

applica-

2

Table 2: Valve Packages for Dual Systems

Valv e Pa ckage Part #

Electric

1000D
500D
260D/100DM/DX
Controller for electric valves

Air

1000D
500D
260D/100DM/DX

Air valves require a special upgrade kit in order to
operate with CO

Air Valve Upgrade Kits:

1

/

8

”

1

/

4

”

Manual

1000D Refill
1000D Outlet
500D Refill
500D Outlet
260D/100DM/DX Refill
260D/100DM/DX Outlet

.

2

68-1247-109
68-1247-091
68-1247-090
68-1240-062

60-1247-104
60-1247-061
60-1247-058

60-5364-234

60-5364-259

68-1247-117
68-1247-118
68-1247-083
68-1247-082
68-1247-077
68-1247-078

1

/

8

”

1

/

8

”

4. Low Tank Level Alarm

In constant pressure mode, the Poor Fill feature
allows you to set a fill point as a percentage of pump
volume. If this volume percentage is not reached after a
refill and re-pressurization, the system sounds an alarm
and stops the pump.

To activate the alarm, press

() >

MORE ( ), and select POOR FILL ().

MENU () > MORE

CO2 with Modifier

See the Modifier Addition section of your user manual
for detailed information about two-pump (CO
modifier) systems.

A dual pump system in constant pressure mode
pumping supercritical CO

combined with a third pump

2

delivering a modifier (usually a solvent) can dispense a
mixture with a programmable v/v ratio, with the Modi­fier Addition Kit (part #68-1247-079) installed. Both
fluids pass through one-way check valves before they
meet and are blended in a mixing tee (see Figure 3 on
the following page).

Note that the CO

input tubing runs behind the valve

2

package mounting bracket before emerging at the valve
inlet.

&

2