{"id":2643,"date":"2026-09-14T18:17:11","date_gmt":"2026-09-14T23:17:11","guid":{"rendered":"https:\/\/www.cestoil.com\/?page_id=2643"},"modified":"2026-09-14T18:17:12","modified_gmt":"2026-09-14T23:17:12","slug":"remplacement-du-dnbp-pour-le-styrene-gcd2673-gcd2676","status":"publish","type":"page","link":"https:\/\/www.cestoil.com\/fr\/case-studies\/gcd2673-gcd2676-styrene-dnbp-replacement\/","title":{"rendered":"Northshore GCD2673 + GCD2676 : Remplacement du DNBP dans la distillation du styr\u00e8ne"},"content":{"rendered":"<div class=\"wpb-content-wrapper\" id=\"wpb-content-root\"><div class=\"vc_row wpb_row vc_row-fluid\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_raw_code wpb_raw_html wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<style>\n.ccr-case{max-width:1120px;margin:36px auto 70px;padding:0 24px;color:#414b53;font:18px\/1.75 Lato,Arial,sans-serif}\n.ccr-case 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li{font-size:16px;line-height:1.6}\n#case-gcd-dnbp .ccr-table-wrap{overflow-x:auto;margin:24px 0}#case-gcd-dnbp table{border-collapse:collapse;width:100%;font-size:16px;line-height:1.5;text-align:left}\n#case-gcd-dnbp th,#case-gcd-dnbp td{padding:12px;border-bottom:1px solid #dedede;vertical-align:top}#case-gcd-dnbp thead{background:#f5f6f8}#case-gcd-dnbp caption{text-align:left;font-weight:700;margin-bottom:12px;color:#333}\n#case-gcd-dnbp .ccr-result-list{margin:0;padding-left:22px}#case-gcd-dnbp .ccr-result-list li{margin-bottom:15px}#case-gcd-dnbp .ccr-result-list li:last-child{margin-bottom:0}\n#case-gcd-dnbp .ccr-note{margin:24px 0;padding:20px 22px;background:#fff;border-left:3px solid #c9ac63;font-size:16px}\n@media(max-width:850px){#case-gcd-dnbp .ccr-hero{grid-template-columns:1fr}#case-gcd-dnbp .ccr-report-preview{margin:0 auto}}\n@media(max-width:600px){#case-gcd-dnbp .ccr-observations{grid-template-columns:1fr;gap:22px}#case-gcd-dnbp .ccr-observations li+li{border-top:1px solid #dedede;padding-top:18px}}\n<\/style><article class=\"ccr-case\" id=\"case-gcd-dnbp\" data-publication-version=\"20260914\">\n<nav class=\"ccr-breadcrumb\" aria-label=\"Fil d&#039;Ariane\"><a href=\"\/fr\/etudes-de-cas\/\">\u00c9tudes de cas<\/a> \/ <a href=\"\/fr\/etudes-de-cas\/#petrochemical-process-solutions\">Solutions pour les proc\u00e9d\u00e9s p\u00e9trochimiques<\/a><\/nav>\n<div class=\"ccr-hero\"><div><p class=\"ccr-label\">Solutions pour les proc\u00e9d\u00e9s p\u00e9trochimiques \u00b7 \u00c9tude de cas<\/p><h1>Northshore GCD2673 + GCD2676 : Remplacement du DNBP dans la distillation du styr\u00e8ne<\/h1><p class=\"ccr-lead\">Une unit\u00e9 de production de styr\u00e8ne d'une capacit\u00e9 de 120 kt\/an a remplac\u00e9 son programme combinant inhibiteur et DNBP par les Northshore GCD2673 et GCD2676. Au cours d'un essai de production suivi, le rendement en goudrons a diminu\u00e9 de 14 % et la teneur en polym\u00e8res dans les fonds de la colonne T-6402 a baiss\u00e9 de 25 % , sans aucun arr\u00eat li\u00e9 \u00e0 une polym\u00e9risation.<\/p><a class=\"ccr-button\" href=\"https:\/\/www.cestoil.com\/fr\/demander-une-etude-de-cas\/?case=2643\">Demander l'\u00e9tude de cas compl\u00e8te<\/a><\/div><aside class=\"ccr-report-preview\" aria-label=\"Aper\u00e7u du rapport\"><a class=\"ccr-preview-card\" href=\"https:\/\/www.cestoil.com\/fr\/demander-une-etude-de-cas\/?case=2643\" aria-label=\"Demandez l&#039;\u00e9tude de cas compl\u00e8te Northshore GCD2673 et GCD2676\"><img loading=\"lazy\" src=\"https:\/\/www.cestoil.com\/wp-content\/uploads\/gcd2673-gcd2676-dnbp-case-preview-v1.png\" width=\"160\" height=\"207\" alt=\"Aper\u00e7u r\u00e9duit de la premi\u00e8re page du rapport d&#039;\u00e9tude de cas Northshore GCD2673 et GCD2676\" decoding=\"async\"><\/a><p class=\"ccr-preview-caption\"><strong>PDF illustr\u00e9 de 2 pages<\/strong>Rapport complet disponible sur approbation.<\/p><\/aside><\/div>\n<aside class=\"ccr-highlight\" aria-label=\"Observations signal\u00e9es\"><p class=\"ccr-label\">Observations signal\u00e9es<\/p><ul class=\"ccr-observations\"><li><strong>\u221214 %<\/strong>Goudron par tonne de styr\u00e8ne : de 7,66 \u00e0 6,58 kg\/t ; environ 130 t\/an de styr\u00e8ne en plus.<\/li><li><strong>\u221225 %<\/strong>Polym\u00e8re dans les r\u00e9sidus de fond de la colonne T-6402 : 1 267 \u00e0 955 mg\/kg.<\/li><li><strong>1,11 million de RMB<\/strong>Valeur annuelle attribu\u00e9e par l'usine au rendement en goudron plus faible.<\/li><\/ul><\/aside>\n<nav class=\"ccr-jump\" aria-label=\"Sur cette page\"><a href=\"#operating-context\">Contexte op\u00e9rationnel<\/a><a href=\"#monitored-application\">Candidature<\/a><a href=\"#reported-results\">R\u00e9sultats communiqu\u00e9s<\/a><a href=\"#case-report\">\u00c9tude de cas compl\u00e8te<\/a><\/nav>\n<section class=\"ccr-section\" id=\"operating-context\"><h2>Contexte op\u00e9rationnel et objectif<\/h2><div><p>A <strong>Unit\u00e9 de styr\u00e8ne de 120 kt\/an<\/strong> Du DNBP \u00e9tait utilis\u00e9 comme retardateur en compl\u00e9ment d'un v\u00e9ritable inhibiteur commercial. Le rin\u00e7age du syst\u00e8me d'injection de DNBP lors des arr\u00eats d'unit\u00e9 g\u00e9n\u00e9rait des effluents contenant du DNBP, tandis que l'azote r\u00e9siduel dans le goudron pouvait contribuer aux \u00e9missions de NOx lors de la combustion de ce dernier. L'usine recherchait un substitut exempt de DNBP capable de contr\u00f4ler la formation de goudron et de polym\u00e8res, sans n\u00e9cessiter de nouveaux \u00e9quipements d'injection ni d'arr\u00eat d'unit\u00e9 li\u00e9 \u00e0 la polym\u00e9risation.<\/p><p>L'accord technique a fix\u00e9 quatre crit\u00e8res d'acceptation : une teneur en styr\u00e8ne dans le goudron inf\u00e9rieure ou \u00e9gale \u00e0 11 % , un rendement en goudron inf\u00e9rieur ou \u00e9gal \u00e0 10 kg\/t de styr\u00e8ne, un co\u00fbt combin\u00e9 des produits chimiques ne d\u00e9passant pas <strong>31,28 RMB\/t de styr\u00e8ne<\/strong>, et aucun arr\u00eat non planifi\u00e9 de la polym\u00e9risation.<\/p><\/div><\/section>\n<section class=\"ccr-section\" id=\"monitored-application\"><h2>Produit et application surveill\u00e9e<\/h2><div><p>Northshore GCD2673 est un v\u00e9ritable inhibiteur, tandis que le GCD2676 est un retardateur. Un essai de compatibilit\u00e9 a montr\u00e9 que le GCD2673 pouvait \u00eatre introduit dans le syst\u00e8me d'inhibiteur existant sans lavage de d\u00e9placement ; seule l'ancienne conduite de DNBP alimentant la colonne T-6401 a n\u00e9cessit\u00e9 un rin\u00e7age \u00e0 l'\u00e9thylbenz\u00e8ne.<\/p><p>GCD2673 a d\u00e9marr\u00e9 le <strong>16 octobre 2023<\/strong> \u00e0 0,35 kg\/t de styr\u00e8ne. Le lot GCD2676 a d\u00e9marr\u00e9 deux jours plus tard avec une courte charge \u00e0 d\u00e9bit \u00e9lev\u00e9, suivie de 1,35 kg\/t. Les analyses quotidiennes des taux r\u00e9siduels et de polym\u00e8re ont justifi\u00e9 quatre r\u00e9ductions de la dose de retardateur et deux r\u00e9ductions de celle d'inhibiteur, pour atteindre <strong>0,28 et 0,64 kg\/t<\/strong> d'ici le 17 novembre. La p\u00e9riode de suivi couvrait <strong>11 989 t de styr\u00e8ne<\/strong> sur une p\u00e9riode de 35 jours de traitement par retardateur et de 37 jours de traitement par inhibiteur.<\/p><\/div><\/section>\n<section class=\"ccr-section ccr-result\" id=\"reported-results\"><h2>R\u00e9sultats communiqu\u00e9s<\/h2><div><ul class=\"ccr-result-list\"><li><strong>Le rendement en goudron a chut\u00e9 de 14 % .<\/strong> Le taux d\u00e9clar\u00e9 a diminu\u00e9, passant de 7,66 \u00e0 <strong>6,58 kg\/t de styr\u00e8ne<\/strong>, en de\u00e7\u00e0 du plafond de 10 kg\/t fix\u00e9 par l'accord. Sur la base d'une capacit\u00e9 de 120 kt\/an de l'unit\u00e9, l'usine a \u00e9valu\u00e9 cet \u00e9cart \u00e0 environ 130 t\/an de styr\u00e8ne suppl\u00e9mentaire, soit approximativement <strong>1,11 million de RMB par an<\/strong> \u00e0 sa valorisation annonc\u00e9e de 8 500 RMB\/tonne.<\/li><li><strong>Le polym\u00e8re pour fonds a chut\u00e9 de 25 % .<\/strong> Moyenne des fonds T-6402 <strong>955 mg\/kg<\/strong> au cours de l'essai, contre 1 267 mg\/kg lors de la p\u00e9riode de r\u00e9f\u00e9rence de juillet \u00e0 septembre. Une unique pointe \u00e0 1 935 mg\/kg a \u00e9t\u00e9 attribu\u00e9e, dans le rapport, \u00e0 une modification inaper\u00e7ue du taux de recyclage des goudrons.<\/li><li><strong>La teneur en styr\u00e8ne dans le goudron a augment\u00e9, mais la moyenne est rest\u00e9e dans les limites indiqu\u00e9es.<\/strong> La moyenne enregistr\u00e9e \u00e9tait de 7,8 % , contre 6,3 % avant le changement. Elle a atteint un pic de 15 % au d\u00e9but de l'essai \u2014 d\u00e9passant ainsi la limite d'acceptation de 11 % \u2014 alors que les conditions \u00e9taient maintenues inchang\u00e9es \u00e0 des fins de comparaison ; l'usine a attribu\u00e9 ce r\u00e9sultat \u00e0 la temp\u00e9rature de l'\u00e9vaporateur \u00e0 film mince.<\/li><li><strong>Aucun arr\u00eat ni aucune alt\u00e9ration de la qualit\u00e9 du produit n'ont \u00e9t\u00e9 signal\u00e9s.<\/strong> Le rapport ne signale aucun arr\u00eat li\u00e9 \u00e0 une polym\u00e9risation ni aucune production non conforme durant l'essai de 35 jours avec l'inhibiteur. Une \u00e9prouvette situ\u00e9e dans le filtre de la pompe de soutirage de fond de la colonne T-6402 a r\u00e9v\u00e9l\u00e9 <strong>0,0007 mm\/an<\/strong> corrosion sans attaque visible.<\/li><\/ul>\n<div class=\"ccr-table-wrap\"><table><caption>Comparaison des donn\u00e9es op\u00e9rationnelles et commerciales publi\u00e9es<\/caption><thead><tr><th scope=\"col\">Mesure<\/th><th scope=\"col\">R\u00e9sultat d\u00e9clar\u00e9<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Rendement en goudron<\/th><td>De 7,66 \u00e0 6,58 kg\/t de styr\u00e8ne (\u221214 % )<\/td><\/tr><tr><th scope=\"row\">Polym\u00e8re de fond T-6402<\/th><td>1 267 \u00e0 955 mg\/kg (\u221225 % )<\/td><\/tr><tr><th scope=\"row\">Co\u00fbt des produits chimiques pour l'essai<\/th><td>50,52 RMB\/t de styr\u00e8ne<\/td><\/tr><tr><th scope=\"row\">Co\u00fbt des produits chimiques optimis\u00e9<\/th><td>42,81 RMB\/t, contre 31,28 RMB\/t convenus<\/td><\/tr><tr><th scope=\"row\">Co\u00fbt optimis\u00e9 apr\u00e8s prise en compte du cr\u00e9dit styr\u00e8ne de l'usine<\/th><td>33,56 RMB\/t, contre une d\u00e9pense r\u00e9elle ant\u00e9rieure de 34,00 RMB\/t<\/td><\/tr><\/tbody><\/table><\/div>\n<p class=\"ccr-note\"><strong>Interpr\u00e9tation des co\u00fbts.<\/strong> Le taux d'utilisation des produits chimiques optimis\u00e9 est rest\u00e9 sup\u00e9rieur \u00e0 l'objectif de co\u00fbt fix\u00e9 par l'accord technique. Le co\u00fbt net comparatif pour l'usine n'a atteint 33,56 RMB\/t qu'apr\u00e8s prise en compte du rendement r\u00e9duit en goudrons, valoris\u00e9 \u00e0 9,25 RMB par tonne de styr\u00e8ne. Le rapport indique que la r\u00e9duction des dosages \u00e9tait toujours en cours \u00e0 la fin de l'essai.<\/p><\/div><\/section>\n<section class=\"ccr-section\" id=\"operational-value\"><h2>Valeur op\u00e9rationnelle<\/h2><div><p>La comptabilit\u00e9 de l'usine a associ\u00e9 la r\u00e9duction du rendement en goudron \u00e0 une production suppl\u00e9mentaire de styr\u00e8ne d'environ 130 tonnes par an, \u00e9valu\u00e9e \u00e0 1,11 million de RMB par an. L'imputation de ce gain au co\u00fbt optimis\u00e9 des produits chimiques a abouti \u00e0 un r\u00e9sultat net <strong>33,56 RMB\/t<\/strong>, soit 0,44 RMB\/t de moins que les 34,00 RMB\/t effectivement d\u00e9pens\u00e9s pour le programme pr\u00e9c\u00e9dent au cours de la p\u00e9riode de juillet \u00e0 septembre 2023.<\/p><p>Cette comparaison \u00e9conomique d\u00e9pend du taux de production de l'installation, de la valorisation du styr\u00e8ne et des donn\u00e9es de co\u00fbts. Une autre unit\u00e9 devrait utiliser son propre bilan des goudrons, sa valeur nette de retour (netback) et ses co\u00fbts de traitement plut\u00f4t que de reprendre directement ce r\u00e9sultat.<\/p><\/div><\/section>\n<section class=\"ccr-section\" id=\"applying-findings\"><h2>Application des r\u00e9sultats<\/h2><div><p>V\u00e9rifiez la miscibilit\u00e9 avec l'inhibiteur actuellement utilis\u00e9 avant d'effectuer le changement. D\u00e9terminez la teneur r\u00e9siduelle en retardateur \u00e0 l'aide d'une charge initiale, puis r\u00e9duisez chaque dose uniquement si les analyses du taux r\u00e9siduel et du polym\u00e8re le permettent. Maintenez chaque r\u00e9glage suffisamment longtemps pour distinguer la r\u00e9ponse au traitement des variations normales du proc\u00e9d\u00e9.<\/p><p>Suivez conjointement le taux de recyclage des goudrons, la temp\u00e9rature de l'\u00e9vaporateur \u00e0 film mince, la teneur en styr\u00e8ne dans les goudrons, la teneur en polym\u00e8re dans les r\u00e9sidus de fond de colonne et le rendement en goudrons. L'augmentation marqu\u00e9e de la teneur en polym\u00e8re et le pic pr\u00e9coce de styr\u00e8ne dans les goudrons observ\u00e9s dans ce cas illustrent la n\u00e9cessit\u00e9 d'associer les conditions op\u00e9ratoires aux donn\u00e9es chimiques.<\/p><\/div><\/section>\n<section class=\"ccr-request\" id=\"case-report\"><h2>Discuter d'une application similaire<\/h2><p>Demandez l'\u00e9tude de cas compl\u00e8te et illustr\u00e9e, et communiquez-nous les d\u00e9tails de votre programme actuel d'inhibiteurs et de retardateurs, les points d'injection, le rendement en goudron, la teneur en styr\u00e8ne dans le goudron ainsi que l'historique de la formation de polym\u00e8res en fond de colonne. Cestoil peut vous aider \u00e0 d\u00e9finir une \u00e9valuation encadr\u00e9e pour le remplacement du DNBP.<\/p><a class=\"ccr-button\" href=\"https:\/\/www.cestoil.com\/fr\/demander-une-etude-de-cas\/?case=2643\">Demander l'\u00e9tude de cas compl\u00e8te<\/a><p class=\"ccr-small\" style=\"margin-top:16px\">Les informations sur l'entreprise et l'usage pr\u00e9vu sont examin\u00e9s avant la communication du PDF d\u00e9taill\u00e9. Pour une assistance li\u00e9e \u00e0 la demande, <a href=\"\/fr\/contact\/\">Contactez notre \u00e9quipe technique<\/a>.<\/p><\/section>\n<p class=\"ccr-small\">Source : rapport d'\u00e9valuation client de l'unit\u00e9 de styr\u00e8ne participante (capacit\u00e9 de 120 kt\/an), couvrant la p\u00e9riode du 16 octobre au 22 novembre 2023, tel que r\u00e9sum\u00e9 dans l'\u00e9tude de cas Cestoil CS-STY-GCD2673-GCD2676-2026A, v1.0. Les valeurs de r\u00e9f\u00e9rence sont celles communiqu\u00e9es par l'usine. Toutes les donn\u00e9es sont fournies par le client ; les performances peuvent varier en fonction de la qualit\u00e9 de la charge et des conditions d'exploitation.<\/p>\n<nav class=\"ccr-links\" aria-label=\"Pages connexes\"><a href=\"\/fr\/applications-des-produits\/solutions-pour-les-procedes-petrochimiques\/additifs-pour-usine-de-styrene-et-dethylbenzene\/\">Applications des proc\u00e9d\u00e9s de production de styr\u00e8ne<\/a><a href=\"\/fr\/applications-des-produits\/solutions-pour-les-procedes-petrochimiques\/additifs-pour-usine-de-styrene-et-dethylbenzene\/cestriguard-2676\/\">Cestriguard 2676<\/a><a href=\"\/fr\/etudes-de-cas\/controle-des-goudrons-par-polymere-de-styrene\/\">Dossier connexe GCD2673 + GCD2676<\/a><a href=\"\/fr\/etudes-de-cas\/\">Toutes les \u00e9tudes de cas<\/a><\/nav>\n<\/article>\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Northshore GCD2673 et GCD2676 ont r\u00e9duit le rendement en goudron 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