Description

Overhead gas/ interisation pressure measurement

Besoins pour ce point de mesure

  • Process control
  • SIL 2/3

Description

DP level measurement raw buffer tank

Besoins pour ce point de mesure

  • Level/ filling control
  • Insensitive against clogging

Description

MIN/MAX level monitoring of formaldehyde gas separator

Besoins pour ce point de mesure

  • Dry-run pump protection
  • SIL2-compliant

Description

Flow measurement at the filter inflow of the formaldehyde

Besoins pour ce point de mesure

  • Optimised flow splitter for minimum pressure loss
  • Many options (heat tracing, purge port etc.)

Description

Temperature measurement in the formaldehyde feed to the polycondensation reactor

Besoins pour ce point de mesure

  • Reactant temperature
  • Thermowell material: 1.4404 / 316L or 1.4571 / 316Ti for standard applications

Description

Pressure measurement in the formaldehyde feed to the polycondensation reactor

Besoins pour ce point de mesure

  • Chemically resistant materials
  • Long-term stable measurement

Description

MIN/MAX level monitoring of polycondensation reactor

Besoins pour ce point de mesure

  • Optional adapter for high temperatures up to +250°C / +482°F
  • Gas-tight feedthrough for toxic gases

Description

MIN/MAX level monitoring of polycondensation reactor

Besoins pour ce point de mesure

  • TBM Tank Bottom Management
  • Ellipsoidal shaped antenna and smooth surface minimise deposits

Description

Continuous level measurement polycondensation reactor

Besoins pour ce point de mesure

  • SIL2-compliant
  • Outputs: relay, transistor, 2-wire, NAMUR or contactless switch

Description

Temperature measurement in the polycondensation reactor and of the generated viscous urea resin

Besoins pour ce point de mesure

  • Chemically resistant metal thermowells
  • Connection heads available up to IP68

Description

Pressure measurement in the effluent of the produced urea resin

Besoins pour ce point de mesure

  • Chemically resistant materials
  • Front flush process connection

Overview

Production of aldehyde derivates in the organic chemical process

Instrumentation for Monitoring and Controlling the Composition in Aldehyde Derivative Production

The widely used aminoplasts are produced by polycondensation of formaldehyde either with urea (urea resins, UF for short) or with melamine (melamine-formaldehyde resins, MF for short), which is technically obtained in large quantities from urea in preliminary processes. The process for obtaining these resins is very similar in each case: When pre-filtered urea solution is added to the formaldehyde solution, viscous UF urea resin is produced in a polycondensation reactor in an acidic environment, which is used as wood glue in chipboard production, for example. Melamine-formaldehyde resins (MF) are used for thermosetting plastics with high hardness and abrasion resistance - for example for electrical insulation or switch parts or tableware. The production process here involves the intermediate product hydroxymethylmelamine, which is obtained by adding formaldehyde to melamine at low temperatures in an aqueous solution. The final curing of the MF resins usually takes place downstream by adding fillers via polycondensation at temperatures of around 100 °C, mainly with the aid of acidic catalysts. A cross-linked duromer is then formed by splitting off water and formaldehyde.

KROHNE has an extensive portfolio of measuring instruments for the process production of aldehyde derivatives, such as aminoplasts, combined with many years of experience in this sector. To optimise the correct molar ratio of formaldehyde and urea for polycondensation, reliable pressure measurement in the feed, continuous MIN/MAX level monitoring and precise temperature measurements in the reactor are essential. Here, KROHNE contributes proven vibration level switches, highly developed radar level measuring devices and tried and tested resistance thermometers.

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