CO2 Removal From Natural Gas
Problem
CO2 is found in natural gas in many locations and must be removed to meet specifications before it can be delivered to the pipeline. Availability of a simple process technology that can be applied in remote, unattended, or offshore situations is highly desirable. Ease of operation, quick start-up, and high on-stream factors are needed in addition to competitive capital and operating costs. Amine systems are used frequently but are complex and have high capital, operating, and installation costs; a relatively high fuel cost; and potential environmental issues.
Membrane Solution
MTR’s membranes can provide a simple, low-cost, compact solution for reducing CO2 in natural gas. These novel membranes have a unique polymer chemistry that is far superior to conventional membranes in withstanding the various components in natural gas. MTR’s membranes therefore require minimal pretreatment and offer very high efficiency separation, with more than 95% hydrocarbon recovery achievable. These membranes can be used for achieving pipeline CO2 specifications of 4 mol% or less, or for providing bulk CO2 separation to reduce inert content in transported natural gas. Due to the high fluxes of these membranes and efficient module packaging, use of MTR’s membrane process minimizes required deck space and weight when used in offshore installations.
Benefits
Standard skid for wellhead CO2 removal
- CO2 content reduced to required specifications (<2 mol% or optimal levels)
- Limited pretreatment required due to robust membrane chemistry
- Unique process design to maximize total hydrocarbon recovery
- High-efficiency packaging minimizes space and weight, making the units ideal for offshore applications
- Easy, low-cost installations. In many cases, single skid systems can installed in hours. Skids can be relocated at minimal cost and very quickly.
- Robust, proven membrane performance at high CO2 contents
- No regular maintenance, no moving parts, and designed for remote unmanned operation
- High on-stream times maximize revenues
System Performance
- Feed Rate: < 1 MMscfd to > 300 MMscfd
- Feed CO2 Content: > 40 mol% to < 5 mol%
- Product CO2 Content: Up to < 2 mol%
- Feed Gas Pressure: 200 to 1200 psia
- Hydrocarbon Recovery: > 95% +