Описания процессов
- Overview
- Inflow measurement of sulphuric acid
- Temperature measurement in the sulphuric acid-oxime reactor
- Inflow measurement of aqueous ammonia in Beckmann process
- Flow measurement of benzene recirculation
- Level measurement of hydrogenation
- Flow measurement of produced raw caprolactam
- Alternative flow measurement of produced raw caprolactam
- Pressure measurement of raw caprolactam in filtering tank and evaporator
- Flow and temperature measurement of steam heating of
- Evaporation pressure measurement
- Temperature measurement of caprolactam
- DP Level measurement in caprolactam distillation
- Integrated control valve with flow, pressure and temperature measurement of water
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.
Требования к данной позиции измерения
- Maintains operation even with degassing effects as in oleum
- Flow, density and concentration outputs optional
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Chemically resistant metal thermowells
- Connection heads available up to IP68
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Suited choice of liner materials
- Conductivity output optional
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Maintains operation with air or gas entrainments in the benzene
- Flow, density and concentration outputs optional
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Measuring distances up to 100 m
- Contact free
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- SIL certified (SIL 2/3)
- For high temperatures up to +400°C /+752°F
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- SIL certified (SIL 2/3)
- For larger lines sizes up t DN600 / 24" (SIL); non-SIL up to DN2000 / 80"
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Filter resistance monitoring
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Integrated energy calculator
- Integrated pressure and Temperature via HART
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Process control
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Chemically resistant metal thermowells
- Tapered Tip for fast reaction
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Control of sump extraction
Рекомендуемые изделия и системы
Требования к данной позиции измерения
- Cooling water management
- local control/ separate DCS not necessary