Detailed introduction

By PDS process with one or two step desulfurizing equipments, H2S, HCN and organic sulfur (RSH,COS,CS₂)can be removed simultaneously in a fast speed and high efficiency. The removing efficiency is 95.0-99.9%,

94-97% and over 50% for H₂S, HCN and organic  sulfur respectively. In which, HCN is translated into (NH₄)₂CO₃.PDS method has no limits for the sort, pressure and constituents of various gases. In normal condition, it is easy to reach to the purification standard for any gas.

 In PDS process, there are no waste liquid discharging, since Na₂SO₄ is always not created and the accumulation of Na₂S₂O₃ and NaSCN can be controlled to a very low level by controlling a suitable technology condition. This method make gas desulfurization become a nontoxic and clean process and have excellent environment effect.

The large particles of sulfur were created and separated easily in the regeneration (oxidation) equipment with PDS process.

Desulfurizing solution was clear because very low content of folating sulfur contained. In particular, PDS process has the function of cleaning sulfur that had been stopped in the desulfurization tower.

The cost of catalyst of PDS process is only 50-80% of that of Stratford (ADA) method or tannin extract method, the consumption of alkali is same compared with the last two methods.

 The successful development of PDS desulfurizing technology has laid a technical foundation firmly for the use of high sulfur coal, oil and natural gas in world.

1/The correct concentration of PDS solution should be 30ppm

2/The Alkali concentration should be 0.3-0.6N. However, your solution mixed with NH3·H2O,and the correct concentration of should NH₃·H₂O＞8g/L；

3/The concentration of catalyst accelerators should be 0.2-0.4g/L or less than 200ppm if you adopt Tannin extract as catalyst accelerators.

4/The best operating temperature for both desulfurization and regeneration processes is between 30℃ to 35℃, and the temperature of gas and solution should be 30℃ to 32℃.

5/ The best PH value is from 9.0 to 9.5.

Major parameters of technological equipment of PDS process.