Stage de fin de format formation ion :
Intitulé :
Réalisée par :
Membres Membres de jury :
Najat OUAKRIM OUAKRIM
Mme S. SALMAOUI : Encadrante FST
Fatima-Zahra EZ-ZAHRAOUI EZ-ZAHRAOUI
Mr. M. GHALIM : Encadrant SUTA
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Mr. H. HARNAFI : Examinateur Mr. K. HABBARI : Président Année universitaire 2010/2011
Nous dédions ce rapport à nos parents en espérant que ce modeste travail leur témoigne notre amour et notre affection. A toutes nos frères A tous nos soeurs. A nos amis (es) pour leur soutien. A tous nos enseignants avec nos profondes considérations. A tous ceux qui nous ont assistés à réaliser ce travail.
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Nous Nous voudron voudrons s exprim exprimer er nos vifs vifs remerci remercieme ements nts à Mr le
Directeur Général de la SUTA, aussi nos vifs remerciements à Directeur eur d’usin d’usine e pour pour tous tous Mr Abbderrahim HASSANI Sous Direct les moyens qui ont mis à notre disposition pour passer ce stage dans de très bonnes conditions. Nous Nous tenons tenons à expri exprime merr notr notre e
prof profon onde de gratit gratitud ude e et nos
sincères remerciements à Mr. yassine
notre parrain de stage
pour pour la qual qualit ité é de son son enca encadr drem emen entt et pour pour nous nous avoi avoirr guid guidé é dura durant nt cett cette e péri périod ode e de stag stage, e, ainsi insi que que pour pour ses ses vale valeur ureu eux x
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Nous Nous adres adresso sons ns égale égaleme ment nt nos nos reme remerci rciem ement ents s à tout tout le pers person onne nell de Sucr Sucrer erie ie Raff Raffin iner erie ies s de Tadl Tadla a (OUL (OULED ED AYAD AYAD)) et particulièrement le personnel du service de regulation pour leur chaleureuse chaleureuse hospitalité hospitalité et pour nous avoir avoir consacré consacré une partie partie de leur leur temps pour pour répondre répondre à toutes toutes nos questi questions ons durant durant ce mois. Nous tenons particulièrement à remercier notre enseignante et encadrant Mr ya yaako akoub ub LAH LAHCE CEN N
ET
qui qui nous nous a fait fait
bénéficier de son expérience. Ses conseils et nos discussions nous ont permis d’améliorer nos connaissances et le contenu de ce document. Ses critiques et ses suggestions toujours assorties de paroles d’encouragement et d’une sympathie exemplaire nous ont été valeur inestimable. Nos remerciements s’adressent également au président, et à tous les membres membres de jury qui nous nous ont fait fait l’honn l’honneur eur de bien vouloir juger ce travail. Nos remerciements vont aussi à tous les enseignants de la filière filière ESA « ELECTRO ELECTROMECN MECNIQUE IQUE DES SYSTME SYSTMES S AUTOMA AUTOMATISES» TISES» pour l’effort qu’ils ont déployé durant notre formation. Enfin que tous ceux qui ont attribué de prés ou de loin à
ce travai travail, l, trouven trouvent, t, ici, ici, l’expr l’express ession ion de notre notre profonde profonde
reconnaissance.
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Liste photos……………………………………………………………………………….2
des
Liste tableaux…………………………………………………………………………......3
des
Introduction générale……………………………………………………………………... ..4
Chapitre I : Présentation de la société so ciété IAperçu général 6 ……………………….....6 ……………………….....
sur
la
SUTA…………………………………..
•
COSUMAR…………………………………………………………………............... COSUMAR…………………………………………………………………...............
•
SUTA………………………………………………………………………………….7 SUTA………………………………………………………………………………….7
6
IILes activités de SUTA………………………………………………………………... 8
la
Chapitre II : processus de la fabrication de sucre IHistoire sucre………………………………………………………………………….10
du
IIAperçu général…………………………………………………………………………...10 Matière première…………………………………………………………….............11 •
Betterave sucrière……………………………………………………………..11 sucrière ……………………………………………………………..11 •
IIILa fabrication sucre………………………………………………………………....12 Diagramme fabrication…... fabrication…............................................................................12 .........................................................................12 •
III-1 Réception……………………………………………………………………………….14 III-2
du de
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Convention adoptée……………………………………………………...........16 adoptée……………………………………………………...........16 •
Mesure de la saccharose………………………………………....16 saccharose ………………………………………....16 •
richesse
en
III-3 Déchargement………………………………………………………………………….16 III-4 Transport et lavage betteraves……………………………………………...........17
des
L’épierreur ……………………………………………………………………...17 ……………………………………………………………………...17 •
Désherbeurs …………………………………………….17 •
•
……………………….
Le lavoir à bras……………………………………………………………….18 bras ……………………………………………………………….18
Le lavoir Rouleaux ………………………………………………………….18 ………………………………………………………….18 •
à
III-5 Découpage en cossettes………………………………………………………………..18 III-6 Echaudage……………………………………………………………………………...18 III-7 Diffusion………………………………………………………………………………..19 •
But principe principe…………………………………………………………...........19 …………………………………………………………...........19
et
•
Paramètres de diffusion…………………………………………………….… diffusion…………………………………………………….…
20 •
Qualité Qualité de découp découpage age………………………………………………… …………………………………………………
20 La Forme cossettes………………………………………………..20 cossettes………………………………………………..20 •
des
•
La
tempé températ rature ure …..…………………………………………………… …..……………………………………………………
•
Le pH…………………………………………………………………..20 pH…………………………………………………………………..20
20 III-8 20
Sécherie…………… Sécherie………………………………….. ……………………...……………………… .…………………………………………… ……………………
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III-9 III-9 22
Epurat Epuration ion………… …………………… …………………… …………………… …………………… …………………… …………………… ……………… ……
Le chaulage……………………………………………………………….22
pré-
•
•
Chaulage………………………………………………………………………22
Première carbonatation……………………………………………………….23 carbonatation ……………………………………………………….23 •
•
Décantation……………………………………………………………...........2 Décantation ……………………………………………………………...........2
3 Deuxième carbonatation……………………………………………………...24 carbonatation ……………………………………………………...24 •
•
Filtration……………………………………………………………................2 Filtration……………………………………………………………................2
4 II-10 Evaporation… Evaporation……………………………… ………………………………………………………… …………………………………………… ……………… 24 Equipements d’évaporation…………………………………………………...24 d’évaporation …………………………………………………...24 •
III-11 Cristallisation………………………………………………………………………...26 III-12 Séchage………………………………………………………………………………..26 III-13 Conditionnement sucre…………………………………………………………...26
Chapitre cristallisation I-
III :
Bibliographie
de
sur
la
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•
La solution…………………………………………………………………….29 solution…………………………………………………………………….29
•
La
•
La saturation………………………………………………………………….29 saturation………………………………………………………………….29
conc concen entr trat atio ion n………………………………………………………………
29 La sursaturation……………………………………………………………....29 sursaturation ……………………………………………………………....29 •
II-2 Représenta Représentation tion de la saturationsaturation-sursa sursaturatio turation…………………… n………………………… …… …………...29 III-Paramètres influençant cristallisation………………………………………………30 cristallisation ………………………………………………30
la
III-1 Influence de température…………………………………………………………..30
la
III-2 Influence de sursaturation…………………………………………………………30
la
III-3 Influence impuretés……………………………………………………………….31
des
III-4 Influence de viscosité……………………………………………………………….31
la
III-6 Influence pH………………………………………………………………………..32
du
IV-Nucléation et croissance cristaux…………………………………………………..32 cristaux …………………………………………………..32 IV-1 Mécanisme de nucléation…………………………………………………………...32 IV-1-1 Mécanisme de primaire primaire………………………………………………...32 ………………………………………………...32 IV-1-2
Mécanisme
de
des la
la
nucléation
la
nucléation
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1er
V-1-1 Présentation de jet ………………………………………………………………….34 ………………………………………………………………….34 V-1-2 Présentation de jet ……………………………………………………………….34 ……………………………………………………………….34
2éme
V-1-3 Présentation de jet ……………………………………………………………….35 ……………………………………………………………….35
3éme
V-2 Conduite de cuisson………………………………………………………………….35
la
V-2-1 Appareil cuire………………………………………………………………………..35 cuire………………………………………………………………………..35
à
•
Départ cycle………………………………………………………… cycle………………………………………………………… …….35
du
•
Pied de cuite…………………………………………………………………..35 cuite…………………………………………………………………..35
•
La lavée……………………………………………………………………….36 lavée……………………………………………………………………….36
Montée de cuite…………………………………………………………….36 cuite…………………………………………………………….36
la
Serrage de cuite…………………………………………………………….36 cuite…………………………………………………………….36
la
•
•
•
Main Mainti tien en
suiv suivan ant t ……………………………………………………………… ………………………………………………………………
•
Coulée………………………………………………………………………....36 Coulée………………………………………………………………………....36
•
Dégraissage……………………………………………………………...........3 Dégraissage ……………………………………………………………...........3
36
7 V-2-3 Préparation de semence……………………………………………………………..37 semence……………………………………………………………..37 V-2-4 Malaxage……………………………………………………………………………37 Malaxage……………………………………………………………………………37
la
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Liste Lis te des fi figur gures es : Figure 1 : les cinq périmètres sucriers au Maroc …………………………………………..12 Figure 2 : Composition de la betterave sucrière ……………………………………………18 Figure 3 : diagramme de fabrication de sucre……………………………………………....18 Figure 4: Structure cristalline du saccharose……………………………………………….34 Figure 5 : diagramme de saturation-sursaturation en fonction de la température………..36 Figure 6 : influence de certaines impuretés sur la vitesse de cristallisation……………….38 Figure 7 : Schéma de cristallisation en 3 jets……………………………………………….40
Liste des photos photos : Photo 1: Betterave Betterave sucrière sucrière ………….……………………………… ………….……………………………………………………17 ……………………17 Photo 2: Betterave Betterave fourragère…………… fourragère………………..………………………… …..…………………………………................17 ………................17 Photo 3: Betterave Betterave potagère potagère ………….……..……………………………… ………….……..……………………………………………..17 ……………..17 Photo 4 : Appareil Appareil d’échantillonn d’échantillonn
…..20
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conditions climatiques. Dans les années soixante, les pouvoirs publics ont mis en place un plan pour l’introduction de plantes sucrières et, en parallèle, un programme programme de création de sucreries publiques. publiques. Le Maroc se positionne comme comme le 5ème plus grand consommateur de sucre au niveau mondial. Le Marocain consomme en moyenne 35 kg de sucre par an, au total ce sont 1,16 million de tonnes de sucre consommées par an [1]. Les sucriers sont tenus alors d’améliorer les performances performances de leurs installations par la mise en relief de plusieurs démarches, démarches, notamment notamment la réduction des pertes de production au niveau de toutes les étapes de raffinage de sucre dont la cristallisation est la plus importante importante étape qui donne le sucre blanc. A côté du rendement en sucre, l’industriel cherche à avoir un sucre de bonne qualité. C’est dans ce cadre que nous avons réalisées le prése résen nt trav travai aill qui a pour but l’am ’amélio liorati ratio on du rend rende ement de la gran granul ulom omét étri rie e : qui qui est est un crit critèr ère e impo import rtan antt dans dans la déte déterm rmin inat atio ion n de l’appréciation du sucre par le consommateur. En effet, le sucre est mieux apprécié lorsque ses cristaux sont uniformes et de taille régulière. En parallèle pour présenter notre travail, nous avons débuté en premier chapitre par une présentation de la société SUTA, le deuxième chapitre porte sur le processus de la fabrication de sucre, sucre, le troisième chapitre fera l’objet l’objet d’une d’une étude étude biblio bibliogra graph phiqu ique e de la crista cristalli llisat sation ion porta portant nt sur sa défin définitio ition, n, solu solubi bili lité té et surs sursat atur urat atio ion, n, para paramè mètr tres es infl influe uenç nçan antt la cris crista tall llis isat atio ion, n, la nucléation, nucléation, la croissance des cristaux et la cristallisation à l’usine. ?????Le dernier chapitre sera axé à la partie pratique ou on a étudié le rend rendem emen entt en sucr sucre e de masse masse cuit cuite e des des appa appare reil ils s de 1er jet, jet, l’étu l’étude de du rendement en cristaux des six appareils, l’étude de la granulométrie du sucre blanc et l’étude de l’impact l’ impact de l’installation du système automatique au niveau
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Chapitre I : Présentation de la société
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Depuis Depuis sa créat création ion en 1929, 1929, COSUMA COSUMAR R n’a cessé cessé de croitr croitre e et de se développer développer afin de devenir le grand Groupe que nous connaissons aujourd’hui. Acteur important dans l’économie de notre pays et véritable moteur œuvrant pour une meilleure compétitivité de la filière sucrière marocaine. COSUMAR
assure
la
production,
le
conditionnement
et
la
commercialisation commercialisation du sucre sous sous quatre formes formes : le Pain de sucre, sucre, le Lingot et le Morc Morcea eau, u, le sucr sucre e en gran granul ulés és.. La prod produc uctio tion n s’effe s’effect ctue ue selo selon n deux deux procédés : •
La transformation de la plante sucrière plantée localement, canne à sucre et betterave à sucre, en sucre blanc.
•
Le raffinage de sucre brut acheté depuis le marché mondial en sucre blanc.
Elle est l’unique opérateur sucrier marocain qui est présent dans tout le te itoi itoi
à tr
ci
filia filiale le
Co
SA Su
Su
bel, bel, Suta Suta
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Le Maroc produit en moyen 45% du besoin national en sucre dont les trois quarts proviennent de la betterave sucrière et le reste de la canne à sucre. Pour les 55% restants, en recourt à l’importation de sucre brut à partir du Brésil que l’on traite ensuite totalement dans la raffinerie de Casablanca.
•
SUTA :
La SUTA SUTA ou « Sucrerie Sucreries s Raffinerie Raffineries s du Tadla Tadla » joue un un rôle primo primordia rdiall dans l’économie nationale en couvrant presque 17% des besoins en sucre et en assurant des pulpes sèches et humides pour l’élevage, ainsi que la mélasse pour les industries de bio fermentation. Elle contribue aussi au développement développement régio régiona nall de l’agri l’agricu cultu lture re et à la créati création on de l’emp l’emplo loii au milie milieu u agric agricol ole e et industriel. Elle Elle est la deuxiè deuxième me sucrer sucrerie ie édifié édifiée e dans dans le cadre cadre d'un d'un progra programm mme e sucrier, inaugurée le 16 mai 1966 après une période qui a duré seize mois.les
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Aujourd’hui, dans le cadre de la mise à niveau du secteur sucrier et sous la gouvernance du Groupe COSUMAR, la SUTA ne fait référence qu’à l’unité d’OU d’OULE LED D AYAD AYAD qui qui a conn connu u une une mult multit itud ude e de trav travau aux x d’ex d’exte tens nsio ion n et de transf transform ormati ation on (Prod (Product uction ion direc directe te du sucre, sucre, instal installat latio ion n d’une d’une unité unité de conditionnement, la préparation de la production mécanisée du sucre pain), les deux autres unités de Béni Mellal et de Souk Sebt étant fermées. [3]
II- Les activité acti vités s de la SUTA : Au sein de la SUTA, lieu de notre stage, le sucre (saccharose) est produit à partir de la betterave betterave sucrière. sucrière. Son objectif, du début de la filière filière à la production production du sucre final, est de partir d’une matière matière première la plus pure possible et de produire, avec un rendement rendement optimum, un sucre
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Cha hap pit itre re II : proce cess ssus us de la fabrication de sucre
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Au cours de la révolution agricole musulmane, musulmane, des entrepreneurs arabes ont adopté les techniques de production de sucre indiennes et les ont affinées, les transformant en une grande industrie. Les Arabes ont créé les premières sucreries sucreries,, raffineries raffineries,, usines et plantations. De son côté la culture romaine semble avoir largement, voire complètement ignoré, cette forme de sucre, ne connaissant que le miel miel.. Notons tout de même que quelques sources nous en parlent parlent dans un cadre cadre médicinal. médicinal. Vers 1390 1390,, une meilleure technique de pressage fut créée, ce qui permit de multiplier par deux la quantité de jus obtenu à partir de la canne. Cela a permis l’expansion économique des plantations plantations de sucre à l’Andalousie l’Andalousie et l’Algarve l’Algarve.. Vers 1420 1420,, la production de sucre fut étendue
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•
Comme plante fourragère (betteraves fourragères).
•
Comme
lég légume ume
dans ans
l'al l'alim ime entat ntatio ion n
hum humain aine
(bett better erav ave es
potagères).
Photo 1: Betterave sucrière
photo 2: Betterave fourragère
photo
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•
2,5 kg de matiè matière res s solub solubles les (comp (compose oses s azotes azotes,, comp compose oses s non non
azotes, sels minéraux). (figure 2)
Eau (76, 5 kg) kg) Mati ѐ re sèche (23,5kg) 100 kg de betterave
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La qualité du sucre produit, dépend également de la qualité du stockage des betteraves après leur récolte. La betterave est une matière périssable qui doit être traitée rapidement pour plusieurs raisons :
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Pulpes humides Pressage pulpes Pulpes
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Les
camio amion ns
son sont
accom compagn pagné és
du bad badge
comportan rtantt
le code
transporteur et le code de l’agriculteur d’une façon anonyme. Sachant que la SUTA est équipé d’un centre de réception unique au Maroc complètement
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Cet échantillon de betterave est soumis à un jet d’eau puissant dans une laveuse. laveuse. Cette laveuse laveuse sert à élimine éliminerr tout tout élément élément étrange étrangerr pendant pendant une minute. minute. Ensuite, l’échantil l’échantillon lon subit subit un décolleta décolletage ge afin d’éliminer d’éliminer la partie partie
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