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Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry

A major cause of premature catalyst deactivation in the catalytic hydrogenation of fatty acids is the presence of impurities in the feedstock. With more oleochemical plants shifting to opportunistic crude palm oil (CPO) as their feedstock, the feedstock quality becomes an important factor in their p...

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Main Authors: Wong, Farng Hui, Lim, Mitchell S. W., Tiong, Timm Joyce, Chan, Yi Jing, Asli, Umi Aisah, Yap, Yeow Hong
Format: Article
Published: John Wiley and Sons Ltd 2023
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TP Chemical technology
Online Access:http://eprints.utm.my/105391/
http://dx.doi.org/10.1002/apj.2973
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spelling my.utm.1053912024-04-24T06:49:07Z http://eprints.utm.my/105391/ Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry Wong, Farng Hui Lim, Mitchell S. W. Tiong, Timm Joyce Chan, Yi Jing Asli, Umi Aisah Yap, Yeow Hong TP Chemical technology A major cause of premature catalyst deactivation in the catalytic hydrogenation of fatty acids is the presence of impurities in the feedstock. With more oleochemical plants shifting to opportunistic crude palm oil (CPO) as their feedstock, the feedstock quality becomes an important factor in their procurement process. For CPO, the impurities level can be coarsely estimated by the deterioration of bleaching index (DOBI). A high DOBI value (e.g. DOBI > 2.99) indicates good quality CPO and ease in processing, while low DOBI value implies low level of carotene and/or high level of oxidised sludge oil, both of which could be detrimental to the processing of CPO. In our work, unsplit CPO feedstocks with varying DOBI value were directly hydrogenated in a laboratory-scale pressure reactor with the presence of commercial nickel catalysts. Experimental results showed that catalyst deactivation was linked to DOBI value, where decreasing DOBI led to faster catalyst deactivation. For example, iodine value (IV) < 1.0 can be achieved for CPO with high DOBI value (2.97) after 150 min, and IV of 5–7 and IV > 20 were achieved for medium DOBI value (2.57–2.68) and low DOBI value (2.24), respectively. For CPO with low DOBI value (2.24), doubling the catalyst dosage ensured that the hydrogenated product met the low IV specification. This work showed that identifying the CPO with DOBI value presents an indicator to the manufacturer to find the right CPO tailored to the existing processes to maximise profitability. John Wiley and Sons Ltd 2023 Article PeerReviewed Wong, Farng Hui and Lim, Mitchell S. W. and Tiong, Timm Joyce and Chan, Yi Jing and Asli, Umi Aisah and Yap, Yeow Hong (2023) Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry. Asia-Pacific Journal of Chemical Engineering, 18 (6). NA-NA. ISSN 1932-2135 http://dx.doi.org/10.1002/apj.2973 DOI : 10.1002/apj.2973
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
Wong, Farng Hui
Lim, Mitchell S. W.
Tiong, Timm Joyce
Chan, Yi Jing
Asli, Umi Aisah
Yap, Yeow Hong
Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry
description A major cause of premature catalyst deactivation in the catalytic hydrogenation of fatty acids is the presence of impurities in the feedstock. With more oleochemical plants shifting to opportunistic crude palm oil (CPO) as their feedstock, the feedstock quality becomes an important factor in their procurement process. For CPO, the impurities level can be coarsely estimated by the deterioration of bleaching index (DOBI). A high DOBI value (e.g. DOBI > 2.99) indicates good quality CPO and ease in processing, while low DOBI value implies low level of carotene and/or high level of oxidised sludge oil, both of which could be detrimental to the processing of CPO. In our work, unsplit CPO feedstocks with varying DOBI value were directly hydrogenated in a laboratory-scale pressure reactor with the presence of commercial nickel catalysts. Experimental results showed that catalyst deactivation was linked to DOBI value, where decreasing DOBI led to faster catalyst deactivation. For example, iodine value (IV) < 1.0 can be achieved for CPO with high DOBI value (2.97) after 150 min, and IV of 5–7 and IV > 20 were achieved for medium DOBI value (2.57–2.68) and low DOBI value (2.24), respectively. For CPO with low DOBI value (2.24), doubling the catalyst dosage ensured that the hydrogenated product met the low IV specification. This work showed that identifying the CPO with DOBI value presents an indicator to the manufacturer to find the right CPO tailored to the existing processes to maximise profitability.
format Article
author Wong, Farng Hui
Lim, Mitchell S. W.
Tiong, Timm Joyce
Chan, Yi Jing
Asli, Umi Aisah
Yap, Yeow Hong
author_facet Wong, Farng Hui
Lim, Mitchell S. W.
Tiong, Timm Joyce
Chan, Yi Jing
Asli, Umi Aisah
Yap, Yeow Hong
author_sort Wong, Farng Hui
title Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry
title_short Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry
title_full Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry
title_fullStr Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry
title_full_unstemmed Relationship between the deterioration of bleachability index (DOBI) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-CPO) in the oleochemical industry
title_sort relationship between the deterioration of bleachability index (dobi) value and hydrogenation performance for the hydrogenation of split-crude palm oil (s-cpo) in the oleochemical industry
publisher John Wiley and Sons Ltd
publishDate 2023
url http://eprints.utm.my/105391/
http://dx.doi.org/10.1002/apj.2973
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score 13.211869

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