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we are specifically reacting to requirements from LED makers

New technology for an environment friendly LED industry: The LARCH system of DAS Environmental Expert GmbH has been especially developed for the disposal of reactive waste gases from the light-emitting diode (Led linear high bay light) industry. As the statutory provisions on waste water and waste gas disposal are to be tightened in Taiwan from 2013 onwards, Taiwanese companies will soon have to start looking around for new solutions.

“With LARCH we are specifically reacting to requirements from LED makers," says Guy Davies, Director Business Unit Gas?Treatment. “The LED industry is known to be a growth market and in our discussions with customers we have become aware of the demands made on modern disposal technologies. We have given a great deal of thought to this and the LARCH system is the result. It has already generated a lot of interest: enquiries from some potential customers have already come in," adds Davies.

A mass market of this scale for LEDs also means increasing emissions. In the manufacture of products based on innovative light emitting diode (LED) technology, ammonia and hydrogen are used in large quantities as process gases. The environmental engineers at DAS have recognised this market trend. In the new LARCH system, the initial thermal dissociation of ammonia is achieved by reaction heat. Hydrogen is then ignited and burnt off by electrical heating elements. The reaction heat is transferred to a downstream heat exchanger. This is an elegant solution for the disposal of the large quantities of process gases generated in LED production.

Although the process is based on a simple principle, it can still economically achieve low emission values. It is thus able to replace the LED high bay light previously used wet scrubbing solutions, which create large quantities of ammonia solution. It is also much more environment friendly.

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