Ethylene, heavy HCs recovery and N₂ purification in PE plant
Problem:
The vent gas from resin degassing bin typically contains ethylene/ethane, heavy hydrocarbons (such as 1-butane, iso-butane, pentane and hexane etc.), hydrogen and huge amount of nitrogen in PE plant. The hydrocarbons and nitrogen losses in the vent gas are close to US$ 1.2 -2.0million/y (for a 300 KTA PE plant)
Especially in Unipol or Innovene PE process, Eurofilm's unique "Mem-Cryo" patented technology (US 10,456,728 B2 issued in 2019), integrating gas separation membrane with expander-based cryogenic technology, recovers not only more than 98% heavy HCs and 60% N2, but also more than 80% ethylene monomer. The payback time is normally less than 1-2 years based on long-term experience of tens of Mem-Cryo units installed.
Application in the following processes:
• Unipol of Univation (USA)
• Innovene of INEOS (UK)
• MarTECH® ADL of Chevron Phillips (USA)
• Hostalen of Basell (Swit)
Performance:
• Ethylene recovery: 80-90%
• Ethylene purities: up to 70 mol%
• Heavy HCs recovery: 90-99+%
• Heavy HCs purities: up to 99+ mol%
• N2 recovery: 70-80%
• N2 purities: 90-99+ mol%
Operating Characteristic:
• Min. operating temperature: lower to -120°C
• Max. operating pressure: up to 25 barg
Scope of supply:
• Compressor
• Condenser
• Refrigeratior (upon request)
• HCs membrane unit
• H2 membrane unit
• Cryogenic (upon request)
Standards:
• Compressor: API 619
• Lubrication, Shaft-sealing and Oil-control Systems and Auxiliaries: API 614
• Machine Protection Systems: API 670
• Mechanical Seals and Supply Systems: API 682
• Pressure vessel: ASME, TEMA
• Electrical: IEC or NEC
• ISO 9001 certified process
• Hazardous (ATEX/Class Div2)
References:
Location: Japan
End user: Mitsubishi Chemical
Capacity of FDPE: 200,000 tons/year
Technology: Unipol/Univation
Ethylene recovery: ≥86%
N2 purities: ≥98 mol%
N2 recovery: ≥40%
Location: Republic of Korea
End user: GS Caltex
Capacity of HDPE: 500,000 tons/year
Technology: MarTECH ADL / Chevron Phillips Chemical
i-butane recovery: >99.9%
Ethylene recovery: >90%
N2 purities: >98 mol%
N2 recovery: >85%
Location: The Philippines
End user: JG summit
Capacity of HDPE: 250,000 tons/year
Technology: MarTECH ADL / Chevron Phillips Chemical
i-butane recovery: >99.9%
Ethylene recovery: >90%
N2 purities: >98 mol%
N2 recovery: >80%
Location: China
End user: Borolander Bassel
Capacity of LLDPE: 450,000 tons/year
Technology: Unipol/Univation
Ethylene recovery: 70%
i-pentane recovery: 97%
i-butylene recovery: 97%
N2 purities: 95 mol%
N2 recovery: 70%
Location: China
End user: Petrochina
Capacity of HDPE: 300,000 tons/year
Technology: Hostalen/Basell
Hexane content: <150 ppm
Nitrogen purities: >99.9 mol%
Location: China
End user: Sinopec-SK
Capacity of HDPE: 300,000 tons/year
Technology: Hostalen/Basell
Hexane content: <150 ppm
N2 purities: >99.9 mol%
Location: Indonesia
End user: PT. Lotte Chemical
Capacity of LLDPE: 200,000 tons/year
Technology: Innovene/Ineos
Ethylene recovery: >92%
Butene-1 recovery: >96%
Address: No. 17, Qinglong Street, Lushunkou Longtou Industrial Zone, Dalian
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