CO2 desorption from activated DEA using membrane contactor with vacuum regeneration technology

Carbondioxide (CO2) content in natural gas must be removed because it inhibits liquefication process of natural gas. CO2 gas separation technology using membrane contactor has been developed, however solvent regeneration using membrane contactors are still rare because it requires a larger energy. The regeneration process by using membrane vacuum technology was put forward to reduce the regeneration energy consumption. In this work, arginine, piperazine (PZ), and potassium carbonate (K2CO3) as activators were added into diethanolamine (DEA) solution to form aqueous solutions of activated DEA. The experiment of CO2 desorption from activated DEA was carried out in hollow fibre membrane contactor (HFMC). The solvent with rich CO2 at 30-70°C was flowed in the lumen of the hydrophobic polypropylene HFMC, and the shell side was maintained at a reduced pressure by a vacuum pump at 20 kPa. The effect of solvent temperature and activators were investigated to get CO2 desorption flux and regeneration efficiency. Experimental result shows that increasing of solvent temperature could enhance CO2 desorption flux and regeneration efficiency. Instead of that, the activated DEA also give better result compared with non-activated DEA. Among three activators, K2CO3 give the best result for desorption flux and regeneration efficiency.

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Superhydrophobic Ceramic Hollow Fibre Membranes for Trapping Carbon Dioxide from Natural Gas Via the Membrane Contactor System

10.21203/rs.3.rs-106301/v1 ◽

2020 ◽

Author(s):

Iltifat Hameed Saud ◽

Mohd Hafiz Dzarfan Othman ◽

Siti Khadijah Hubadillah ◽

Mohd Haiqal Abd Aziz ◽

Mohammad Arif Budiman Pauzan ◽

...

Keyword(s):

Carbon Dioxide ◽

Contact Angle ◽

Natural Gas ◽

Fourier Transforms ◽

Ph Value ◽

Hollow Fiber Membrane ◽

Liquid System ◽

Hollow Fibre ◽

Membrane Contactor ◽

Superhydrophobic Property

Abstract The membrane contactor system is one of the most important technologies to trap CO2 from natural gas. To apply this technology, hollow fibre membranes with a superhydrophobic surface must be used. Three types of fluoroalkyl silane (FAS) molecules [C6, C8, C10] at different immersion times (6, 24, 48,72 h) were used to modify kaolin hollow fiber membrane into the superhydrophobic property to capture CO2 from natural gas via contacting gas-liquid system. The kaolin was chosen due to its abundantly available at an affordable price as well as a high amount of groups hydroxyl (OH) in the surface which easily reacts with (FAS) during the grafting process. Superhydrophobicity was distinguished by Fourier transforms infrared (FTIR), scanning electron microscope (SEM), liquid entry pressure of water (LEPw) measurement, and contact angle (CA). The chosen superhydrophobic kaolin membrane was tested for carbon dioxide (CO2) capture via the membrane contactor system. With increasing time of immersion, the hydrophobicity phenomena raised gradually until superhydrophobicity property was obtained. It was proved that the 48 hours was sufficient time to obtain the desired superhydrophobicity property to avoid wetting pores of the membranes. Besides, the perfect type of FAS for separation CO2 was C8 based on sufficient LEPw and contact angle. The reduction of pH was observed after testing the performance of using membrane contactor to separate CO2 by water as absorbent where pH value was reduced from 6.6 to 4.3 within one hour, which concludes that the success of the gas-liquid system to remove CO2 from natural gas.

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Impact of heavy hydrocarbon impurities on polytetrafluoroethylene (PTFE) membrane stability

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1195/1/012007 ◽

2021 ◽

Vol 1195 (1) ◽

pp. 012007

Author(s):

S M Saleh ◽

Z P Chan ◽

F F A C Chang

Keyword(s):

Thermal Stability ◽

Natural Gas ◽

Surface Morphology ◽

Functional Groups ◽

Hollow Fibre ◽

Membrane Contactor ◽

Heavy Hydrocarbons ◽

Ptfe Membrane ◽

Promising Technology

Abstract Membrane contactor technology has attained considerable attention as a promising technology to reduce CO2 content in natural gas. In this study, the main objective is to investigate the effect of heavy hydrocarbons impurities, often present in natural gas, on polytetrafluoroethylene (PTFE) hollow fibre membrane. The membranes were immersed for months in n-heptane, 1-decene, benzene and toluene, and analysed periodically through its surface morphology, composition, functional groups, hydrophobicity, and thermal stability. The characteristics of PTFE fibres remained unchanged even after long term exposure with heavy hydrocarbons. This study provides a better understanding of the robustness of using PTFE membrane fibre for CO2 removal in membrane contactor system.

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Superhydrophobic ceramic hollow fibre membranes for trapping carbon dioxide from natural gas via the membrane contactor system

Journal of the Australian Ceramic Society ◽

10.1007/s41779-021-00572-7 ◽

2021 ◽

Author(s):

Iltifat Hameed Saud ◽

Mohd Hafiz Dzarfan Othman ◽

Siti Khadijah Hubadillah ◽

Mohd Haiqal Abd Aziz ◽

Mohammad Arif Budiman Pauzan ◽

...

Keyword(s):

Carbon Dioxide ◽

Natural Gas ◽

Hollow Fibre ◽

Membrane Contactor

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Volume reduction of produced water generated from natural gas production process using membrane technology

Water Science & Technology ◽

10.2166/wst.2000.0622 ◽

2000 ◽

Vol 41 (10-11) ◽

pp. 117-123 ◽

Cited By ~ 10

Author(s):

C. Visvanathan ◽

P. Svenstrup ◽

P. Ariyamethee

Keyword(s):

Natural Gas ◽

Produced Water ◽

Hollow Fibre ◽

Gas Production ◽

Oil And Grease ◽

Natural Gas Production ◽

Pre Treatment ◽

Selection Of ◽

Spiral Wound

This paper presents a case study of a natural gas production site covering various technical issues related to selection of an appropriate Reverse Osmosis (RO) system. The long-term field experience indicates the necessity of the selection of appropriate pretreatment systems for fouling-free RO operational conditions. The produced water has a variety of impurities such as oil and grease, process chemicals used for corrosion and scaling control, and dehydration of natural gas, etc. This situation leads to a complicated and extremely difficult task for a membrane specialist to design RO systems, especially the pre-treatment section. Here as part of the pretreatment selection, two types of UF membrane modules viz. spiral wound and hollow fibre, with MWCO of 8000 and 50,000 Dalton respectively, were tested in parallel with NF membranes of the spiral wound type with MWCO 200 Dalton. The UF permeate is used as feed for RO compatibility testing. Both configurations of UF failed to be compatible, due to irreversible fouling of the RO membrane. The NF membrane, however, showed interesting results, due to membrane stability in terms of cleaning and fouling. The NF plant with 50% capacity gave a recovery of 75% and the RO plant gave a recovery of 60% versus the expected 92–95%. The long-term tests have indicated that the reminder of the membranes could be installed to achieve full capacity of the plant. This study also demonstrates the importance of selection of proper pre-treatment set-up for the RO system design.

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