METHANE PURIFICATION 

          

CHALLENGE


          

          

The customer is an important manufacturer of industrial and rare gases and needs to purify methane from a natural source for an electronic application. They want to obtain a highly pure methane product and find the best and most cost-effective separation technology for this application.

The typical feed composition is:

  • N2: 0.6 %
  • CO2: 1000 ppm vol.
  • Ethane: 6.0 %
  • Propane: 2 %
  • Iso-Butane: 0.9 %
  • Methane: 90 %
  • Oxygen: 800 ppm

 




          

          

OUR SOLUTION


          

          

The proposed system is based on two main sections:

  1. A pre-treatment section, where water and carbon dioxide are removed via adsorption on molecular sieves in a parallel double bed system. One of the beds is in service while the other one is regenerated with waste hot gas after pure CH4 separation.

  2. A cryogenic distillation section for the separation of other impurities, which is composed of two distillation columns:

 

Plant Design Data:

  • Methane Feed: 15 Nm3/h
  • Outlet methane composition:
    • CH4: 99.9995 %
    • O2: < 0.5 ppm
    • H2O: < 1 ppm
    • N2: < 4 ppm
    • CO2: < 0.5 ppm
    • Other impurities: < 0.5 ppm

Main Utilities Consumption:

  • Liquid Nitrogen: 45 kg/h
  • Electric power: 5 kW



          

          

RESULTS


          

          

Innovative Solution - The Polaris plant offered an integrated system combining multiple technologies to solve the problem of removing several different types of contaminating compounds.

Safe and Reliable - A guaranteed safe and reliable solution was provided for regenerations of the molecular sieves - even in the presence of highly flammable streams such as methane.

Improved Product Quality & Value - Overall, when a client is interested in reaching very pure products, the Polaris plant can upgrade product quality, thus improving resale value.




          







Innovative and Customized Separation Technologies

1704 East Boulevard | Suite 200 | Charlotte, NC
P 704 350-1320 | F 704 373-2603 | info@comipolaris.com