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Technology - REGESOX™
February 15, 2003
Introduction
The REGESOX™ process if used primarily
for the treatment of gases containing low concentrations of CS2 / H2S.
These gases are typical of the viscose fibre production process.
Sulphuric acid in the concentration range
of 40 to 60 wt%H2SO4 is produced as a by-product.
- Recovery of up to 95% of the total feed gas sulphur content
- Simple and flexible process suitable for large variations in feed gas
composition
- No waste products
- No consumption of chemicals or absorbents
- Low or zero fuel consumption
The REGESOX™ is a regenerative heat exchange process
consisting of two reactors loaded with CS2 / H2S oxidation catalyst,
SO2 conversion catalyst and inert heat exchange material. Cold wet feed
gas is heated by the treated gases leaving the second reactor. The preheated gases
enters the first reactor and is heated to the required reaction temperature by the inert
heat exchange material. The gases then pass through the CS2 / H2S
oxidation catalyst followed by the SO2 conversion catalyst. The oxidation
reactions are exothermic and the temperature of the gas increases. The hot gases
pass from the first reactor into the second reactor where the hot gases are cooled while
heating the catalyst and reactor material. The remaining heat in the gas is used to
preheat the incoming cold gas.
After 5-10 minutes, the flow is reversed. The second reactor has sufficient heat
stored in the inert heat exchange material to heat the cold incoming gases to the required
reaction temperature. The process of switching the first and second reactors is
repeated. The sulphuric acid that is formed will condense on the heat exchange
material.
The acid is collected at a temperature of approximately 60°C and a concentration of
approximately 50 wt% and may be recycled directly to the spinning plant acid system of the
viscose fibre plant due to the high purity of the acid.
A fuel fired heater between both reactors compensates for any heat losses and is used
mainly during start-up. The system can thus be operated with nearly zero fuel
consumption.
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