TITLE Development of the apparatus for destruction of global warming substances such as fluorocarbons and halons
(Joint Program to Promote Technological Development with the Private Sectors)
in Ueda Lime Manufacturing Co.,Ltd.

   Global warming gases, fluorocarbons and halons, have been prohibited in production and are going to perform their destruction treatment all over the world.  In Japan, the law of fluorocarbons recovery and destruction was promulgated on December 2001 and the countermeasure is going to be carried out in earnest.  However, the practical destruction method of halon  is still not established.  Therefore, in this project the destruction system of the global warming substances using practical apparatus is developed and is planned for commercialization.

   The characteristic of this technique is based on the procedures that fluorocarbons and halons are heated at 900~950℃ on the absorbent (light burnt dolomite) using electric heater to decompose to hydrogen fluoride, hydrogen chloride, hydrogen bromide and the others and the resulting gases are trapped to the absorbent by chemical absorption at high temperatures.

   The following points have been investigated to promote the practical use of this technique.

1.     Operation test of the continuous destruction treatment of fluorocarbons for more than 24 hours to confirm the destruction ability, operation performance, safety in measurement of exhaust gas, etc.

2.     Operation test of the continuous destruction treatment of halons. 

   Consequently, the following results were obtained from the investigations.

1.     The continuous operation test was performed using 10 kg/hour of HCFC-22 for 100 hours. The concentration of non-decomposed HCFC-22, hydrogen chloride and hydrogen fluoride was all under the standard value.

2.     The continuous operation test was performed using of halon-1301. The continuous destruction treatment of halon-1301 was confirmed. 

    The improvement in the destruction ability and the promotion for the practical use of this technique are still under investigation. And finding a use for the spent absorbent is a problem to be solved.