Neftesintez

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LPG Desulfurization

Among the most toxic pollutants hydrogen sulfide is one of the "leading" ones. It gets into atmosphere and water mainly from industrial processes, particularly in mining and processing of sulfur crudes, coal gasification, biomass processing.

Currently there are various methods of purification of hydrogen sulfide gas, which are applied depending on conditions. The choice of treatment depends on many factors. One of the most important performance criteria is the amount allocated for the installation of sulfur, which is determined by the flow of gas and the concentration of hydrogen sulfide.

When amount of sulfur is higher than 15 t / day, the most economically feasible process is the chemical absorption of amine solution and subsequent disposal of acid gases in the Claus plant.

In case of gas feedstock in terms of sulfur is less than 5 tons/day THIONOL Process is the most feasible one.

Our Solution

Procedure of treatment is rendered to batches process of sequence of chemo sorption of sulfur compounds followed by oxidative regeneration of catalyst.

Core of the process is absorption of H2S, CO2 and RSH onto the catalyst THIONOL followed by regeneration by air.

High pressure gas flows through absorber (contactor) to gas-oil separator. Separator is assigned to separate purified gas from liquid catalyst.

Continuous contact is provided by circulation of catalyst solution in sequence: separator > pump > absorber >separator

The bubbler is positioned horizontally along the lower generatrix of the shell of the vessel and a pipe-in-pipe construction (both ones are perforated). Regeneration procedure is brought to bubbling air passing thorough the catalyst layer to recover its activity.

Advantages:

  1. Resource of catalyst based on regeneration is definitely better than sacrificial (unregenerable) reagents – scavengers widely used in international practice and makes around 630 mg [H2S] per 1 gr [THIONOL].
  2. Unlike commonly used absorbents of hydrogen sulphide catalyst itself binds not only hydrogen sulfide but mercaptans as well.
  3. Alternation of stages of anaerobic chemisorption and regeneration by air allows to embody a simple technology, without feeding air into the gas and difficulties in controlling air content of the gas mixture.
  4. In contrast to world’s common practice redox catalyst based on an iron complex (III) EDTA THIONOL catalyst converts hydrogen sulfide to soluble sulfides, without the formation of elemental sulfur in the form of a solid precipitates.
  5. Spent catalyst solution is a valuable product, which can be used as co-catalyst in treatment of liquid hydrocarbon feedstock from hydrogen sulfide and mercaptan for catalytic THIONOL process.
  6. The catalyst does not contain carcinogenic and difficult to handle substances such as formaldehyde and methanol. Thus there is no risk of toxic pollution to atmosphere especially during procedures of discharge of well gas with a high content of nitrogen and carbon dioxide, i.e. at the time when burning of flaring gas is impossible.