Description

Inflow measurement of sulphuric acid

Besoins pour ce point de mesure

  • Maintains operation even with degassing effects as in oleum
  • Flow, density and concentration outputs optional

Description

Temperature measurement in the sulphuric acid-oxime reactor

Besoins pour ce point de mesure

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

Description

Inflow measurement of aqueous ammonia in Beckmann process

Besoins pour ce point de mesure

  • Suited choice of liner materials
  • Conductivity output optional

Description

Flow measurement of benzene recirculation

Besoins pour ce point de mesure

  • Maintains operation with air or gas entrainments in the benzene
  • Flow, density and concentration outputs optional

Description

Level measurement of hydrogenation

Besoins pour ce point de mesure

  • Measuring distances up to 100 m
  • Contact free

Description

Flow measurement of produced raw caprolactam

Besoins pour ce point de mesure

  • SIL certified (SIL 2/3)
  • For high temperatures up to +400°C /+752°F

Description

Alternative flow measurement of produced raw caprolactam

Besoins pour ce point de mesure

  • SIL certified (SIL 2/3)
  • For larger lines sizes up t DN600 / 24" (SIL); non-SIL up to DN2000 / 80"

Description

Pressure measurement of raw caprolactam in filtering tank and evaporator

Besoins pour ce point de mesure

  • Filter resistance monitoring

Description

Flow and temperature measurement of steam heating

Besoins pour ce point de mesure

  • Integrated energy calculator
  • Integrated pressure and Temperature via HART

Description

Evaporation pressure measurement

Besoins pour ce point de mesure

  • Process control

Description

Temperature measurement of caprolactam

Besoins pour ce point de mesure

  • Chemically resistant metal thermowells
  • Tapered Tip for fast reaction

Description

DP Level measurement in caprolactam distillation

Besoins pour ce point de mesure

  • Control of sump extraction

Description

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

Besoins pour ce point de mesure

  • Cooling water management
  • local control/ separate DCS not necessary

Overview

Caprolactam production in the organic chemical process

Continuous Monitoring Ensuring High Purity Levels in Caprolactam Outputs

Caprolactam, or ε-Caprolactam to be precise, which is produced by the megaton every year worldwide, is mainly used as a base material in the manufacture of polyamide-6 fibres (brand name Perlon). Almost all of the industrial manufacturing processes today take place using cyclohexanone as the intermediate stage and can be roughly divided into three steps:
First, the cyclohexanone is produced from aqueous ammonia and benzene. Next, the cyclohexanone can be converted to the base substance cyclohexanone oxime using hydroxylamine and sulphuric acid. This reacts in another process step in the presence of sulphuric acid and oxime through the Beckmann process to become ε-Caprolactam (raw caprolactam). This must then be separated from the ammonium sulphate phase. Hydrogenation in the presence of von Raney nickel noticeably increases the caprolactam yield. The next process stages involve purifying and concentrating the caprolactam monomer by extraction, distillation and crystallisation.

The complexity of the caprolactam production process demands optimal process control so that both the quality requirements for the manufacture and maximum plant productivity are guaranteed. KROHNE offers a tried-and-tested range of measuring equipment for maximum performance requirements. In addition, the process conditions in caprolactam manufacturing now face additional challenges because of increasing environmental requirements with fewer greenhouse gases, lower energy input and salt-free routes. This requires continuous and precise monitoring of the process parameters such as pressure, flow and temperature. KROHNE's devices from the OPTIBAR, OPTIMASS, OPTIFLUX and OPTITEMP ranges ensure this. They generate valid realtime information for the process control system, are impressively sturdy and work reliably even with highly aggressive media such as sulphuric acid. KROHNE systems can thus guarantee reliable operation of the caprolactam plant.

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