Environmentally Friendly Catalysts

The HYDECAT process

In this section we see how a catalytic process that was originally developed for one purpose has found other environmentally friendly uses.

What is HYDECAT?

The Hypochlorite Decomposition Catalysis, HYDECAT process was first developed at the request of ICI ChlorChemicals for the decomposition of waste hypochlorite (chlorate(I)). These arose from the manufacture of hypochlorite bleach.

The process uses beds of extruded pellets of the catalyst. This is nickel oxide plus iron promoter. The overall reaction is:


2NaCl + O2

The HYDECAT reaction.

The hypochlorite ion is decomposed by the nickel oxide catalyst.

The pilot plant

The pilot plant was a 3 metre square unit with five beds containing 0.2 cubic metres of catalyst. The first commercial sale was to a 'CFC' replacement plant in Baton Rouge, USA. This module contained 3.5 cubic metres of catalyst and had a flowrate of 1.15 m3/hour. It reduced concentration of hypochlorite from 9% to less than one part per million (0.0001%).

HYDECAT plant.