Dynamique non linéaire du marché mondial des huiles et des graisses

Voituriez, Tancrède

doi:10.3406/ecoru.1998.4989

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Ce processus de marginalisation est dû tout à la fois à la substitution progressive de l'huile de coprah par celle de palme pour les usages alimentaires en zone tropicale [2] et à la montée en puissance de l'huile de palmiste qui vient concurrencer l'huile de coprah à l'intérieur des huiles lauriques pour les usages industriels et cosmétiques [3]. L'huile de palmiste, très minoritaire au sein des lauriques au début des années 60 (production de 490 000 tonnes contre 1 860 000 tonnes pour l'huile de coprah), fait maintenant presque jeu égal avec l'huile de coprah.…”

Section: Quelques éLéments D'explicationunclassified

Replantations des cocoteraies : mythe ou réalité ?

Ribier¹,

Rouzière²

2000

OCL

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Résumé : Le constat du faible dynamisme des plantations de cocotier et de la part déclinante du coprah dans la production et les échanges mondiaux pourrait laisser craindre que les cocoteraies sont condamnées à terme. Cela n'est pas si sûr, car le cocotier dispose d'un certain nombre d'atouts, notamment en conditions villageoises, et se prête à des utilisations variées qui dépassent le strict cadre du coprah : la plante dite aux mille usages est d'abord une plante vivrière. L'article passe en revue les conditions sous lesquelles de nouvelles plantations sont envisageables et présente quelques solutions alternatives à la replantation, comme la réhabilitation ou la diversification dans le cadre d'associations de culture sous cocotier adulte. Summary:The article examines the future of coconut plantations worldwide, and more specifically in Africa. It does so by retracing planting dynamics over a long period , attempting to explain the main trends, describing the main conditions under which coconut planting or rehabilitation are feasible, and proposing a methodological approach designed to identify appropriate action plans for the problems encountered. Whilst the sluggishness of coconut planting and the declining share of copra in world trade are mentioned, the article also draws attention to the different functions fulfilled by coconut plantings in medium and small-scale production structures. In this context, targeted replanting or rehabilitation programmes can have a highly positive impact on the well-being of the populations involved, especially when they form part of a production diversification initiative, with integration of derived or alternative activities.

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Section: Quelques éLéments D'explicationunclassified

Replantations des cocoteraies : mythe ou réalité ?

Ribier¹,

Rouzière²

2000

OCL

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“…To overcome the problems of using edible natural esters in submerged processors, it is essential to turn to natural esters with low food consumption rates. The literature presents palm kernel oil, whose worldwide consumption is only 4% in 2018 [29], castor oil which is inedible and toxic [30,31], jatropha cursa oil [32] to name but a few. In the literature, we note an insufficiency of their thermo-physical characterization at variable temperatures.…”

Section: Introductionmentioning

confidence: 99%

Determination at Variable Temperatures and Analysis of the Physico-Thermal Properties of Palm Kernel and Castor Oil Methyl Esters as Dielectrics for Power Transformers

Achille¹,

Ghislain²,

Louis³

et al. 2023

IJHT

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Transformers have always used mineral oil as a liquid dielectric, and scientists have noted its harmful effects on human health and the environment. For more than two years, these vegetable oils have been positioned as real substitutes for mineral oils in view of their excellent physical, chemical and thermal properties. However, being oils sometimes intended for human consumption, such as sunflower oil, corn oil, olive oil, rapeseed oil, soya oil, rice bran oil, coconut oil, palm oil and many others, it is imperative to orientate the use of these oils towards the needs of the population. It is imperative to direct their use to natural non-edible esters in order to avoid a food shortage. Work is being done in this direction, but these are not yet fully determined in terms of their physico-thermal properties as in mineral and other edible oils. This work is a contribution to the determination and analysis of the physico-thermal properties of palm kernel and castor oil methyl esters (PKOME and COME) at variable temperatures. A comparison of the behavioural results with mineral oil (MO) widely used in processors shows a similar trend. Also, the values obtained by extrapolation at room temperature are compared to the values found in the literature concerning: relative density, we have a relative error of 3.47% for PKOME, 0.10% for COME, for kinematic viscosity we have a relative error of 8% for PKOME and 1.46% for COME. The second order polynomial correlations established from the measurements have a coefficient of determination close to 1. The values obtained from these correlations are in accordance with the expectations of ASTM D 1217 for relative density, ISO 3104 for kinematic viscosity, ASTM D 7896 for thermal conductivity and the adiabatic calorimetry method for specific heat.

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Dynamique non linéaire du marché mondial des huiles et des graisses

Cited by 2 publications

References 9 publications

Replantations des cocoteraies : mythe ou réalité ?

Replantations des cocoteraies : mythe ou réalité ?

Determination at Variable Temperatures and Analysis of the Physico-Thermal Properties of Palm Kernel and Castor Oil Methyl Esters as Dielectrics for Power Transformers

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