Description

Brine preparation

Besoins pour ce point de mesure

  • Pulse, frequency, status, and current outputs
  • Huge coice of liners

Description

Brine preparation - additives

Besoins pour ce point de mesure

  • High accuracy (±0.05% flat)
  • Bluetooth connectivity

Description

Temperature measurement of high purity brine

Besoins pour ce point de mesure

  • Chemically resistant PTFE
  • Connection heads available up to IP68

Description

Flow measurement of brine feed and recirculation

Besoins pour ce point de mesure

  • High immunity against magnetic fields
  • High measuring accuracy and long-term stability

Description

Differential pressure between anolyte and catholyte header

Besoins pour ce point de mesure

  • High immunity against magnetic fields
  • High stability on small measuring span

Description

Flow measurement of the produced caustic soda

Besoins pour ce point de mesure

  • Full bore measuring pipe
  • Choice of resistant materials
  • Low pressure loss

Description

Individual anolyte header pressure measurement

Besoins pour ce point de mesure

  • Chemical resistant materials
  • High stability on small measuring span

Description

Pressure measurement in the chlorine tank

Besoins pour ce point de mesure

  • Chemical resistant materials
  • Bluetooth connectivity

Description

Flow measurement of the dry chlorine gas

Besoins pour ce point de mesure

  • Materials suited for harsh conditions
  • Installation positions: vertical, horizontal or upside down

Description

Level measurement of the tanks with concentrated and diluted caustic soda as the end product

Besoins pour ce point de mesure

  • Installation in small and narrow tanks with agitators
  • Flush-mounted lens antennas with no intrusion into tank

Description

Flow measurement of the caustic soda fed to the mixer and the water

Besoins pour ce point de mesure

  • Maintains operation even with degassing effects in caustic solution
  • Flow, density and concentration outputs optional

Description

Individual catolyte header pressure measurement

Besoins pour ce point de mesure

  • Permeation resistance
  • High stability on small measuring span

Description

Chlorine pressure measurement for pressure control

Besoins pour ce point de mesure

  • Chemical resistant materials
  • High measuring accuracy and long-term stability

Description

Integrated control valve with flow, pressure and temperature measurement of water

Besoins pour ce point de mesure

  • Dilution management
  • local control /separate DCS not necessary

Overview

Chlor-alkali electrolysis in inorganic chemicals

Efficient instrumentation for precise and pure end products

Chlor-alkali electrolysis produces the important commodity chemicals chlorine, hydrogen and caustic soda from sodium chloride and water. The purity of the end products is central to all the process stages. The basic substance is brine. At the start, the brine saturation is set by precipitation, filtration and preliminary purification of the brine. As the electrolysis consumes vast amounts of energy, process efficiency is of particular importance. The modern membrane electrolysis process, which is becoming increasingly popular across the globe, uses much less energy and is less polluting than conventional electrolysis processes – while maintaining a similar level of purity of the end products dry chlorine, hydrogen and caustic soda. However, the membrane process requires the brine used and circulating in the process to be of very high quality. Furthermore, all of the processes attempt to separate the chlorine gas produced from the hydroxide to effectively avoid a back reaction from chlorine to chloride and hypochlorite, as this would contaminate the caustic soda. One of the key process parameters here is the optimal temperature setting. All of this is crucial for composition and concentration of the caustic soda formed.

KROHNE's sophisticated measuring technology is part of the state-of-the-art equipment featured in the superior process technology used in chlorine chemistry. For example, the Coriolis mass flowmeters work for aggressive media such as caustic soda virtually without pressure loss and also feature ultramodern diagnostics functions and digital communications options. Our pressure transmitters feature an impressive robust design for measurements in complex process pressure and level applications, for example in the chlorine tank. And KROHNE's variable area flowmeters can be used to measure the flow of both chlorine gas and liquids. Integrated electronic equipment and application diagnostics in these devices can detect fouling, as well as pulsating flows or gas compression oscillations and even blocked floats. This results in unprecedented reliability.

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