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Otimização de Condições Processuais e Sustentabilidade Ambiental das Áreas de Preparação de Xarope e de Extrusão de Fibra Acrílica
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Integrada num mercado estagnado de produção de fibra acrílica, a SGL Composites, S.A. tem posto em prática a sua estratégia com foco na otimização de processos, para garantir a qualidade do produto final e reduzir os custos associados aos mesmos.
Com a recente diminuição da capacidade de produção de fibra têxtil, procedeu-se à análise de parâmetros críticos, nomeadamente o Tempo de Permanência e a Quantidade de Polímero Mal Dissolvido, que influenciam a qualidade do xarope produzido e, consequentemente, o nível da conformidade da fibra. Os respetivos resultados servirão como referência para futuros trabalhos que se venham a concretizar.
No âmbito da otimização da Área de Preparação de Xarope, determinou-se que, anualmente, ocorre a libertação de emissões na ordem das 53 t/ano a 112 t/ano, havendo um desperdício anual, em termos de custos, de 71 550€ a 151 200€, respetivamente. Para recuperar 99% da Dimetilacetamida (DMAc), procedeu-se ao dimensionamento de uma coluna de enchimento, que deverá apresentar um diâmetro entre 0,21 e 0,26 metros e uma altura que se enquadre entre os 2,32 e 2,72 metros.
Por sua vez, no sistema de recuperação pertencente à Área Spinning, ocorreu uma troca de fluidos de lavagem, sendo atualmente alimentado com água recuperada (RW). Para otimizar a quantidade recuperada de DMAc, estudou-se os efeitos que adjaziam da variação do caudal de RW e da sua temperatura. Comprovou-se que se recupera uma quantidade de DMAc relativamente idêntica, independentemente do caudal de RW, sendo conveniente fornecer o sistema com o caudal mínimo de RW para diminuir o seu consumo. Contrariamente, para temperaturas de RW mais elevadas, para além de se recuperar uma maior quantidade de DMAc, também se minimiza o consumo de água gelada (CW) no permutador onde ocorre o processo de arrefecimento de RW antes do seu encaminhamento para o sistema de recuperação.
Integrated in a stagnant market of acrylic fibre production, SGL Composites, S.A. has been implementing its strategy with focus on process optimization to guarantee the quality of the final product and to reduce the costs associated with them. With the recent reduction in the textile fibre production capacity, critical parameters, namely the Residence Time and the Amount of Poorly Dissolved Polymer, which influence the quality of the produced dope and, consequently, the level of fibre compliance, were analysed. The respective results will serve as a reference for future works that may be carried out. Within the scope of optimization the Dope Preparation Area, it was determined that emissions in the order of 53 t/year to 112 t/year are annually released, with an annual waste, in terms of costs, of 71 550€ to 151 200€, respectively. To recover 99% of Dimethylacetamide (DMAc), a packed-bed column was designed, with a diameter between 0,21 and 0,26 metres and a height between 2,32 and 2,72 metres. Furthermore, a change of washing fluids occurred in the recovery system of the Spinning Area, being currently fed with recovered water (RW). To optimize the amount of DMAc recovered, the effects of varying the RW flow rate and its temperature were studied. It has been shown that relatively the same amount of DMAc is recovered regardless of the RW flow rate, being appropriate to provide the system the minimum RW flow rate to reduce its consumption. Conversely, for higher temperatures of RW, in addition to recover a greater amount of DMAc, the consumption of chilled water (CW) in the heat exchanger where RW cooling process takes place before it is routed to the recovery system is also minimized.
Integrated in a stagnant market of acrylic fibre production, SGL Composites, S.A. has been implementing its strategy with focus on process optimization to guarantee the quality of the final product and to reduce the costs associated with them. With the recent reduction in the textile fibre production capacity, critical parameters, namely the Residence Time and the Amount of Poorly Dissolved Polymer, which influence the quality of the produced dope and, consequently, the level of fibre compliance, were analysed. The respective results will serve as a reference for future works that may be carried out. Within the scope of optimization the Dope Preparation Area, it was determined that emissions in the order of 53 t/year to 112 t/year are annually released, with an annual waste, in terms of costs, of 71 550€ to 151 200€, respectively. To recover 99% of Dimethylacetamide (DMAc), a packed-bed column was designed, with a diameter between 0,21 and 0,26 metres and a height between 2,32 and 2,72 metres. Furthermore, a change of washing fluids occurred in the recovery system of the Spinning Area, being currently fed with recovered water (RW). To optimize the amount of DMAc recovered, the effects of varying the RW flow rate and its temperature were studied. It has been shown that relatively the same amount of DMAc is recovered regardless of the RW flow rate, being appropriate to provide the system the minimum RW flow rate to reduce its consumption. Conversely, for higher temperatures of RW, in addition to recover a greater amount of DMAc, the consumption of chilled water (CW) in the heat exchanger where RW cooling process takes place before it is routed to the recovery system is also minimized.
Descrição
Palavras-chave
Otimização de Processos Tempo de Permanência Polímero Mal Dissolvido Dimetilacetamida Coluna de Enchimento Água Recuperada