Description

Flow measurement of feed to alkylation process

Requirements

  • Process control
  • Changing composition

Description

Flow measurement of sulfuric acid

Requirements

  • Process control
  • Agressive medium

Description

Level and interface measurement in acid settlers

Requirements

  • Avoid contamination
  • Varying levels of hydrocarbon emulsion and sulfuric acid

Description

Level measurement in the caustric scrubber and deisobutaniser

Requirements

  • Prevent overfill
  • Determine level in scrubber

Description

Flow measurement of alkylate

Requirements

  • Maintain mass balance
  • Process control

Description

Supervisory and validation software

Requirements

  • Visualisation and monitoring of critical processes
  • Control of reporting, trends and alarm handling
  • Statistical evaluation of measurement data

Overview

Sulfuric acid alkylation process in the oil & gas industry

Feed of propene and butene monitoring

The lighter oils originating from the lower parts of the distillation column, after passing through Hydrotreaters and the Fluid Catalytic Cracker (FCC), produce low-molecular-weight alkenes (butenes (C4), pentenes (C5), propene (C3H6)) and also isobutene (C4H10). The acid alkylation process converts these streams into alkylate, a high octane and clean burning gasoline blending component. Depending on the acid used, the process is called either SAA (Sulfuric Acid Alkylation) or HFA (Hydrofluoric Acid Alkylation).

Significant amounts of sulfuric acid are used during the alkylation process: to withstand the effects of the corrosive liquids on such instrumentation, KROHNE has developed a dedicated electromagnetic flowmeter. For flow measurement of the feed of propene and butene and for the produced alkylate measurement, KROHNE has a series of ultrasonic flowmeters available.

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