Process details
- Overview
- Level measurement of methane reservoir
- Level measurement in olefin pre-treatment
- Temperature measurement in olefin pretreatment as well as in the alkylate reactor and distillator
- Process pressure measurement
- Level measurement in sulphuric acid reservoir
- Inflow measurement of sulphuric acid
- Reactor pressure measurement
- Level measurement of separator
- Differential pressure measurement in section of fractionation column
- Fraction column head pressure measurement
- Level measurement in distillation plant
- Flow measurement of extracted alkylate
- Conductive conductivity measurement in coolant circuit
- Level measurement in coolant supply
- Cooling water DP level measurement
- Integrated control valve with flow, pressure and temperature measurement of cooling water
Olefin processing in the organic chemical process
Instrumentation ensuring high purity levels in ethylene and propylene outputs
In petrochemistry, excess hydrocarbon gases can be profitably turned into high-quality alkylate petrol through refinement and cracking – for use for example in modern engines. The first part of the procedure involves isomerising the n-butane (alkane) by dehydrogenation. This creates an approx. 50/50 mixture of isobutane and isobutylene, which is further processed by way of olefin pretreatment, followed by an alkylation process, through which the gaseous olefins are obtained catalytically using concentrated sulphuric acid or fluoric acid at low temperatures. Downstream treatment of the process cooling water takes place outside of the explosive area. Compared to direct alkylation of isobutylene, this technology offers cost advantages to the operator, as the output of alkylate petrol is doubled. Moreover, as the supply of butane is increasing across the globe, it is often worthwhile for operators to convert their existing MTBE plants to this type of process.
Thanks to many years of experience in the area of petrochemistry, KROHNE has a wide range of suitable measuring equipment for use in piping and tanks for oil and gas applications. This includes, for example, flowmeters and level transmitters for use in explosive areas in processes involving hydrocarbons, as well as corrosive liquids such as sulphuric acid. Our level transmitters allow continuous, non-contact measurement in both very small and very large storage and process tanks – even at difficult to access measuring points. Conductivity sensors (both conductive and inductive) and sensors for other water parameters complete the extensive range for cooling water treatment in olefin processing.
Requirements
- Installation on magnetic level indicators (MLI) or in bypass chambers
- Ceramic process seal system for demanding process conditions
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- Overfilling prevention
- Tank internal reflections can be eliminated
- SIL 2/3 certified
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- Chemically resistant PTFE
- Connection heads available up to IP68
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- Process pressure control
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- Second sealing made of METAGLAS
- Antenna extensions up to 1 m
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- High accuracy mass, density and volume flow measurement (±0.1% of MV)
- Drainable thanks to single straight tube design
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- Pressure control reactor
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- Reversed interface measurement
- Horizontal or vertical housing to suit every installation
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- Differential pressure via packings
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- Process pressure control
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- Installation in bypass chamber
- Available as compact version or with remote converter
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- Maintains operation over a wide range of gas fractions
- High capacity bulk measurement
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- Monitoring of cooling water quality
- Integrated temperature sensor and standard VP2 connector
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- Intuitive quick setup procedure
- Probe lengths can be customised on site
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- Level control
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- Cooling water management
- local control/ separate DCS not necessary