C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/332
C01B 17/05 (2006.01) B01D 53/52 (2006.01)
Patent
CA 1282940
ABSTRACT It was previously thought that the Claus reaction of sulfur dioxide and hydrogen sulfide in water to give elemental sulfur, without additives, gives very low conversion, and that some additives such as a buffer or a catalyst must be used to attain satisfactory hydrogen sulfide conversion. However, it has now been discovered that when hydrogen sulfide and sulfur dioxide are introduced in water simultaneously and continuously for a considerable period of time, at least until the water attains pH 2 or less, the conversion increases gradually and becomes steady at high levels. The present invention thus provides a process based on this factor, namely a liquid phase Claus reaction to form elemental sulfur as a sulfur-in-water dispersion by simultaneous and continuous feeding of hydrogen sulfide and sulfur dioxide into a pressurized water medium substantially free from any additive, for a time sufficient to reduce the pH of the water to pH 2 or less.
503628
Fujita Tetsuo
Matsuoka Hiroo
Takenaka Senji
Takinami Takao
Toida Tsutomu
Hirons Brown & Orange
Jgc Corporation
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