ATR-ASAHI GLASS Process Systems (P) Ltd

Other Details

Dry HCl Gas Generation Plant (H2SO4 Process)

The plant is designed to produce dry HCL gas (moisture content < 0.001%) by the process of dehydration of 30% hydrochloric acid solution with concentrated sulphuric acid. The plant is designed to operate as a continuous process.

Controlled quantity of concentrated sulphuric acid is fed from top of the packed column. A co-current feed of 30% hydrochloric acid solution is also fed to the column. HCL gas is generated when the two liquid acid feeds come in contact. The top portion of the packed column acts as a dehydration zone for the product HCL gas. Suitable column internals like liquid re-distributors as well as mist eliminator sections have been provided in the design. Heat Exchanger (E-1) has been designed as gas cooler operating on cooling water/chilled water. The bottom product from the plant is spent sulphuric acid approx 70% acid soln.

Once all the operating conditions are stabilized and maintained; rate of generation of HCL gas depends only upon rate of hydrochloric acid (30%) feed. The system turn-down ratio is high. All the wetted parts of the system are fabricated from corrosion resistant materials (Glass and PTFE).


Floor Space Area:

    2 m x 1 m
    Overall height 10.5 m


Salient Features:

    Low capital cost
    Simple process
    Dry gas available without drying unit
    Very compact design
    Large quantity of sulphuric acid required
    Large quantity of sulphuric acid required to be handled
    Effluent with HCL impurity
    Load on effluent treatment plant
    Higher operating cost