How to prepare HCl gas from HCl acid

[gettering]

Hi,

I heard that HCl gas could be effective for cleaning the quartz tube in the high temp. furnace. But, seems there is no commercially available HCl gas. So, we are planning to prepare HCl gas using HCl acid we have in our lab. Could you tell me how to prepare HCl gas using HCl acid? I'm not sure what solutions are required for preparing HCL gas exactly, the recipe, and the needed equipments.

Thank you.

 

[kenvlach]

Hydrochloric acid (concentrated lab grade) is about a 37 wt% solution of HCl(gas) dissolved in water (dissociated as H+ & Cl(-)). The vapor above concentrated hydrochloric acid is almost entirely HCl(gas). Look it up in a CRC Handbook of Chemistry & Physics.

HCl(anhydrous) is readily available, but if not familar with the compressed, liquified form (vapor pressure above the liquid is 613 psi @ 70 ^oF) maybe too dangerous to bother with. Many specialty gas suppliers can furnish; e.g.,

http://www.mathesontrigas.com/catalog/category.aspx?category_id=5&mode=home

http://www.praxair.com/praxair.nsf/...04edcc3ed014b77285256555003f8e59?OpenDocument

 

[gettering]

Thank you so much for your information. I found the gas supplier deal with hydrogen chloride gas. Thank you.