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Artículo

Emulsion copolymerization of acrylonitrile and butadiene in a train of CSTRS. Intermediate addition policies for improving the product quality

Minari, Roque JavierIcon ; Gugliotta, Luis MarcelinoIcon ; Vega, Jorge RubenIcon ; Meira, Gregorio RaulIcon
Fecha de publicación: 12/2006
Editorial: Plapiqui
Revista: Latin American Applied Research
ISSN: 0327-0793
e-ISSN: 1851-8796
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ingeniería Química

Resumen

A continuous industrial emulsion copolymerization of acrylonitrile (A) and butadiene (B) carried out in a train of 8 continuous stirredtank reactors (CSTRs) at 10 °C is theoretically investigated, with the aim of producing nitrile rubber (NBR) of a quality similar to that obtained in an equivalent batch process. The rubber quality is specified by the latex characteristics (number particle concentration and number-average particle diameter), and by the molecular parameters (average values of the copolymer composition, the molecular weights, and the degree of branching). A mathematical model of the NBR industrial batch process is here extended for simulating the operation of the CSTR train. Two NBR grades of a different chemical composition are investigated. Compared with the batch product, the continuous Normal Steady State (SS) operation, with the complete recipe fed into the first reactor of the train, produces a deteriorated rubber (higher polydispersity and higher degree of branching). Such undesirable effects can be corrected through intermediate additions of A and chain transfer agent (CTA) along the continuous train. Finally, the reduction of the off-spec product generated during the change of grade between Normal SSs is also investigated. To this effect, “bang-bang” strategies for the comonomers and the CTA feeds in the first reactor of the train allow reducing up to 30 % of the off-spec product generated when a simple step change in all the feeds is applied.
Palabras clave: Emulsion Copolymerization , Reactor Train , Composition Control , Molecular Weights Control
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/26351
URL: http://www.laar.uns.edu.ar/indexes/artic_v3604/vol_36_4_pag301.pdf
Colecciones
Articulos(INTEC)
Articulos de INST.DE DES.TECNOL.PARA LA IND.QUIMICA (I)
Citación
Minari, Roque Javier; Gugliotta, Luis Marcelino; Vega, Jorge Ruben; Meira, Gregorio Raul; Emulsion copolymerization of acrylonitrile and butadiene in a train of CSTRS. Intermediate addition policies for improving the product quality; Plapiqui; Latin American Applied Research; 36; 4; 12-2006; 301-308
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