Modular Complex Process

· Gas treatment

 

Natural and APG gas contains various impurities that need to be removed in order to meet the specifications to run an efficient MaxGTL+. Some impurities reduce the efficiency of the process.

These impurities include condensed oils, solid particles, arsenic, mercury, oxygen, compounds of sulphur and carbon dioxide, all of which originate from the gas itself or through its gasification.

 

 

 

 

On completion of gas treatment, the syngas is free of impurities and is rich in H2 and CO, which are the basic elements needed to manufacture syncrude.

This treatment undertakes few steps:

– Compression / drying
– Desulfurization
– Mixer / steam conversion
– Partial catalytic oxidation Reactor

A significant advantage of the gas treatment processes is that a clean CO2 stream is obtained.
The stream of captured CO2 is ready for sequestration and that option would be economically feasible.

· Fisher Tropsch Synthesis

Before the gas goes in the Fischer Tropsch process, the dehydrated synthetic natural gas is supplied to the diaphragm gas separating vessel wherein the hydrogen is separated to ratio of synthetic natural gas.

CO:H2 = 1:1

After the gas is treated, it goes into the Fischer Tropsch reactor. The purpose of FT synthesis is to combine CO and H2 into carbon chains by reacting carbon monoxide and H2 with the presence of a catalyst, heat and pressure.

For our business model of focusing on fuel production, the preferable carbon chains are long, saturated and paraffinic in nature (linear hydrocarbons containing only single bonds carbon-to carbon or carbon-tohydrogen).

fisher_tropsh verdeReactor of the liquid-phase (slurry) synthetic process of Fisher-Tropsch

  • Specific area of the heat exchanging area is 50 m2/1000m3 of synthetic NG*h
  • Average line speed in the reactor is 0.5 m/s
  • Reactor works at a temprature of 350 C.
  • Liquid catalyst could be emptied and filled in a short period of time (1 hour)
  • Production of alfa olefins are from 15 to 65, depending in your product of choice.
  • Production rate of catalyst for synthetic natural gas is 5.3 m3/1 kg of Fe*h
  • Output of hydrocarbons is 163 g/m3 of synthetic natural gas with ration CO:H2 = 1:1

· Product work-up and refining

The product streams of the FT synthesis process contain hydrocarbons ranging from fuel gases and LPG to naphtha, middle distillates, heavy distillates and long chained paraffinic waxes. Further upgrading of this synthetic oil into higher value end products generally involves fractionation, catalytic reforming, hydro treating, hydro cracking and isomerization. These processes are widely used in the oil refining industry.
The product obtained vary according to the FT technology, process conditions and subsequent upgrading.Large/Medium GTL plants are aimed primarily at producing middle distillates for transportation fuels (diesel,kerosene and naphtha). Smaller plants may be focused on specialty markets (chemicals, base oils and waxes).