Description

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

Requirements

  • No connection to a DCS necessary
  • Built-in redundancy for maximum system availability

Description

Flow measurement of cooling water circuit

Requirements

  • Remote version optional
  • Twin instrument for high safety or reliability requirement

Description

Temperature measurement in the reactor

Requirements

  • For main cellulose solution control
  • Short T90 time

Description

Electronic level/differential pressure measurement at reactor

Requirements

  • Level control
  • Suitable for fibre content

Description

Level measurement of acetone supply

Requirements

  • Measuring distances up to 60 m
  • Converter is rotatable and removable under process conditions

Description

Inflow measurement of pulp mass

Requirements

  • Approved for use in hazardous areas: ATEX, IECEx db eb
  • Suited for chemically aggressive fibrous products

Description

Level measurement of cellulose acetate reservoir

Requirements

  • High dynamics despite dusty atmospheres
  • Purging system for antenna cleaning

Description

Level measurement of acetic acid tank

Requirements

  • Protective connection systems for corrosive media
  • SIL 2/3 certified for safety-related applications

Description

Dosing of catalyst (sulphuric acid)

Requirements

  • High accuracy (±0.05% flat), for catalyst dosing
  • Wireless access via Bluetooth

Description

Flow measurement of acetone

Requirements

  • Maintains operation even with entrained gas of up to 100%.
  • Best-in-class price/performance ratio

Overview

Cellulose fibres in the organic chemical process

Ensuring Efficient Chemical Recovery and Recycling for Sustainable Fiber Production

Many cellulose fibres today, such as artificial silk and insulating materials, are based on chemically produced cellulose fibres. The basic materials are usually wood, plant remains, cotton and recycled newspaper. The cellulose must first be extracted for industrial fibre production. This occurs by partly esterifying cellulose from the plant fibres soaked to pulp with acetic acid, whereby cellulose acetate flakes develop in a chemical reaction. These are then dissolved in acetone in a reactor to textile pulp, which can be processed to endless yarn (filament) in the so-called dry-spin process by means of nozzles in the warm air flow. Subsequent crimping (kinking) and cutting further produces cellulose acetate staple fibres.

Key to cellulose fibre production are both environmentally friendly processes – for example the recovery of solvents – and consistent product properties. This can only be achieved with reliable process control with highly accurate technical measuring systems. Besides affordable Coriolis mass flowmeters, KROHNE also offers vortex flowmeters with integrated temperature and pressure sensor, as well as electromagnetic flowmeters. The latter are especially suitable for complex process applications in very harsh process conditions with abrasive media such as pulp. Furthermore, radar level meters offer non-contact level measurement, even in large and narrow silos. And our electronic differential pressure transmitters can be fitted on request with easy-to-service signal lines between the measuring heads instead of filled capillaries.

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