METHOD OF HCL GAS GENERATOR
Dry HCl Gas generation plant are designed and manufactured for producing high purity HCl from 30-33% HCl solution. Moisture content in the gas is negligible which makes it versatile in use for any critical chemical reactions in process industries.
We are supply three type of HCL gas generators based on the working principle and customer requirement.
Ablaze can successfully design and supply HCL Gas Generation plants form 5 Kg /Hr up to 250 Kg / Hr capacity .
Larger capacity plants can also be provided on request .
The plant has been designed as a continuous process to produce dry HCL gas by the process of distillation of 30% hydrochloric acid solution along with a co-current stream of Calcium chloride solution.
30% hydrochloric acid solution is fed to the azeotropic distillation column (C-1).The feed is pre-heated by steam in the heat exchanger (E-1).Simultaneously a co-current feed of concentrated calcium chloride is also fed to the distillation column.
The calcium chloride breaks the azeotrope formed between HCL and water and as a result almost all the HCL available in the solution is released as gas.
The shell and tube type of heat exchangers (E-1 and E-4) are designed as a thermosiphon reboilers where the heat energy for the distillation process and the evaporation process is supplied by steam.
The vapour from the reboiler strips the available gas from the feed acid solution in the column. The top product HCL gas is dried in the Drying Unit using a suitable dehydrating agent. The moisture content in the product HCL gas is expected to be less than 0.001%.
The bottom product from the column (C-1) is dilute calcium chloride solution with some HCL content. The dilute CaCl2 solution is concentrated in the evaporator (E-4) and the re concentrated CaCl2 solutionis recycled to the distillation column by pump (P-2)
The vapour from the evaporation process consists of water and expected to contain less than 1% HCL. The water vapour is condensed in the heat exchanger (E-5) prior to discharge.
The system selected is very stable.
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)
Industrial Hydrogen Chloride is commercially available in the market as 30% concentrated aqueous solution of Hydrochloric . But in many for certain applications e.g. bulk drug and pharmaceuticals, HCL is required in anhydrous state for critical reactions where moisture cannot be tolerated. Such users generate anhydrous HCL from commercial grade for their captive consumption.
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