Removal Of Mercury From Natural Gas By A New Activated Adsorbent From Olive Stones

2018

Articles Scientifiques Et Publications

ASJP

Université Abdelhamid Ibn Badis - Mostaganem

Benderdouche, Nouredine

Chemrak, Mohammed Amin

Bestani, Benaouda

Benallou, Mokhtar Benzekri

Cagnon, Benoît

Résumé: This study was devoted to the valorization of a plant waste (olive stones): that is widely available in Mediterranean countries in order to remove mercury from natural gas. The raw material from olive stones was prepared by pyrolysis, chemical activation with phosphoric acid, and physical activation under steam. Two olive stone-based granular activated carbons were prepared: one with the virgin stones, while the other was impregnated with sulphur. After treatment, the adsorbents obtained were characterized by determining the iodine number, the methylene blue index, and by estimating the porous properties by N2 adsorption at 77 K. Thermogravimetric analysis and infrared spectroscopy analysis were carried out to determine the functional groups before and after mercury adsorption. An experimental study of vapour-phase mercury adsorption by the activated carbons (virgin and sulphur-impregnated) and a comparison with a commercial material (HGR) were performed. The comparison, made by analyzing the adsorption in a continuous mode, showed that the proportion of sulphur and the porosity were important for the removal of mercury. In the conditions used, the mercury adsorption on the ACs studied follows a physisorption mechanism. The results showed that granular activated carbon-based olive stones (sulphur-impregnated) are very efficient to remove mercury (with 2864 mg/g) and also less expensive than commercial activated carbon due to their local availability.

Mots-clès:

activated carbon

olive stone

sulphur

adsorption

mercury introduction in recent years

algeria has made considerable efforts to increase its agricultural production

the state policy focuses on agricultural subsidies such as interest-free credit and the planting of productive trees such as olive groves

thanks to this policy

five million olive trees have been planted

producing 628 000 tons of olives per year

25 % of this production is vegetable waste (olive stones)

[1] which is traditionally used for combustion or is unused

[2] it would therefore be very interesting to valorize and to transform this waste to obtain new adsorbent materials that can be used to improve the quality of the environment by adsorbing pollutant compounds

algeria is one of the world’s major exporters of natural gas (ng)

this gas contains many undesirable elements that disrupt the operation of equipment including co2

h2o

and heavy metals such as mercury

[3] in addition to its toxicity

mercury is highly corrosive to the metals with which it is in contact

forming amalgams

aluminum alloys are among the most severely affected by this phenomenon

6] for example

an explosion in 1973 at the skikda liquefied natural gas plant in algeria led to 27 fatalities and financial losses of

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