cpp – Process technology for the chemical industry 01.2019

need to be replaced after 15,000 operating
hours.
Many processes and laboratories must be
kept oil-free to avoid contamination of the
products – another strong argument in favour
of chemistry diaphragm pumps. They
are dry-running and require neither operating
nor cooling fluids, and they also operate
completely oil-free without any abrasion.
This guarantees a dry, clean vacuum and at
the same time reduces operating costs, since
no consumption or disposal of consumables
occurs.
For protection against particles and condensate
droplets, chemistry diaphragm vacuum
pumps can be equipped with an inlet catch
pot. An emission condenser is used to recondensate
the vapours at the pump exhaust.
Solvent recovery rates close to 100 %
can be realised in this way, keeping both
production sites and the environment clean.
Precisely controlled vacuum
Rotary evaporation and many other processes
require that the vacuum is controlled
as precisely as possible. Speed-controlled
diaphragm pumps like the Vario series
achieve this precision automatically by adjusting
the pump’s motor speed. This results
in fewer strokes per minute, significantly reducing
wear and tear and extending the service
intervals accordingly.
As a result, Vario pumps are nearly mainte -
nance-free in many applications. Evaporation
rates are maximised due to the hysteresis-free
pressure control when compared
with conventional, two-point control using
solenoid valves. Process times are consequently
up to 30 % shorter. Energy consumption
and thus operating costs can simultaneously
be reduced by up to 90 % depending
on the process in question. While
precise vacuum control is paramount, userfriendliness
and ease of use are becoming
more and more important. Vacuu-Select, the
common controller on all Vario diaphragm
pumps, sets a benchmark for straightforward
and efficient operation: simply choose
and start the desired application on a stateof-the-art
touch display and let the controller
execute the vacuum process all the
way through. In case of solvent evaporation,
Vacuu-Select automatically detects the boiling
point and adapts the pressure continuously
as necessary. Needless to say, the desired
vacuum and other parameters are
readily combinable in custom applications.
Only chemical resistant materials are used
in the wetted area of chemistry diaphragm
pumps
From small to large
Vacuubrand offers a comprehensive range of
chemistry diaphragm pumps with Vario
control. Typical applications such as rotary
evaporation are covered along with supplies
to local vacuum networks, kilo labs and
mini plants. Even high boiling solvents can
be easily evaporated at low temperatures
using pumps with ultimate pressures of less
than 1 mbar. Pumping speeds up to 30 m 3 /h
are possible with large chemistry diaphragm
pumps (maximum pumping speed:
20 m 3 /h) and Duo pumping units. In the
latter case, the speed of two individual
pumps is synchronously controlled and precisely
adjusted to the vacuum requirement.
For many applications – especially in mini
or pilot plants – 100 % system uptime is essential.
Any interruption due to mainte -
nance, even when carried out at regular intervals,
costs valuable process time.
VAC 24seven, the modular process pump
series providing pumping speeds of up to
120 m 3 /h, addresses this issue. At the heart
of every pump module are two variable
speed pumps. Up to three pump modules
can be combined with one control module.
Individual pumps may be uncoupled for
servicing, while the speed of the other
pump(s) is automatically adjusted in order
to maintain the correct process vacuum.
This opens up totally new options for process
technology.
Atex chemistry vacuum pumping unit MV
10C EX Vario +AK+EK
The pump modules are available in two different
versions with an ultimate vacuum of
5 or 70 mbar. The control module provides
synchronous vacuum control of the individual
pumps, determines the required pumping
speed and ensures an optimal process
due to the demand-based speed control.
Energy consumption is minimised and
maintenance intervals extended.
No sparks please
Almost all Vacuubrand diaphragm pumps
and measuring instruments are approved for
Atex category 3. If this category is not sufficient,
chemical diaphragm pumps and
pumping units conforming to Atex category
2 (e.g. for Zone 1) are also available. These
pumps can be controlled in combination
with the Vacuu-Select controller and corresponding
system accessories, allowing fully
automatic operation of the vacuum process
without complex programming.
www.cpp-net.com
Online search: cpp0119vacuubrand
AUTHOR:
DR. BARBARA
RICHARZ
Product Manager,
Vacuubrand
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