Falling Film Absorber for HCl, HBr, Cl2, SO2

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Package Unit

	Package Unit
Azeotropic Boiling Route
Sulphuric Acid Route
Adiabatic Absorber (Hcl, HBr, Cl₂, SO₂)
Falling Film Absorber (Hcl, HBr, Cl₂, SO₂))
Bromine Recovery Plant
Sulphuric Acid Dilution Plant

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Falling Film Absorber

	FALLING FILM TYPE
	Available up to 450 mm dia.
	Capacity : From 10 Kg/Hr to 900 Kg/Hr

SAILENT FEATURES
	High absorption efficiency.
	High acid concentration achievable.
	Low outlet temperature.
	Easy operation and maintenance.
	Safe Operation due to low isothermal temperature.
	Handle a wide range of gas loading with minimum liquid flow rates to maintain full tube wetting.
	All the wetted parts of the falling film absorber are corrosion resistant to all the aggressive gases even at elevated temperatures.
	Variation in Hydrogen Chloride Gas flow rates or Composition causes no operation problem.

Other Area Of Application:
	Hydrogen Chloride Gas / Sulphur Dioxide Gas Absorption
	Hydrogen Chloride Gas / Chlorine Gas Absorption
	Hydrogen Chloride Gas / Chlorine Gas / / Sulphur Dioxide Absorption
	Hydrogen Bromide Gas absorption

Process Description
Hydrogen Chloride gas is produced from the variety of process industries & mainly from chlorination operation. This must be scrubbed before venting to the atmosphere. Hydrogen chloride has great affinity of water and easily absorbed in water. The absorption of Hydrogen Chloride gas in to water cause large amount of heat, which has to be removed by means of suitable device.

The falling film absorber is the simplest form of HCl absorber, which can be operated continuously. Falling Film Absorber is a vertically mounted shell and tube heat exchanger. The standard configuration of the falling film absorber consists of a suitable shell and tube heat exchanger with the necessary drain outlet for the acid. The Hydrogen Chloride Gas enters at the top of the absorber and flows concurrently with water/Dilute HCl. Cooling Water is circulated through shell side of the Falling Film absorber to absorb the heat generated by the dilution of Hydrochloric acid gas with water. Due to its unique design and construction, the heat of absorption is efficiently removed at the zone of absorption, thereby making the absorber extra efficient. Thus the higher concentration of acid is produced due to low absorbing temperature.

The remaining un-absorbed gas along with other inerts from the bottom of the absorber is entering in to ventury scrubber or at the bottom of the tail gas scrubber. Process water is circulated through ventury to absorb the HCl gas and form dilute acid. The advantage of providing ventury is to create negative pressure in the system. This dilute acid is circulated through Falling Film Absorber to absorb HCl gas as explained above.

The falling film absorber does not require sub cooler in order to pro duce strong acid at ambient temperature.