Tropical tannin for engineering application: a review

Zulkafli, Hassan and W. A., Ibrahim and Azizul Helmi, Sofian and Noor Aishah, Rosli (2018) Tropical tannin for engineering application: a review. In: 4th International Conference Of Chemical Engineering And Industrial Biotechnology (ICCEIB 2018) , 1-2 Aug 2018 , Seri Pacific Hotel, Kuala Lumpur. pp. 201-203.. (In Press / Online First)

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There is a great concern to protect the steel surfaces from corrosion phenomenon in the environment of oil and gas industry. Several approaches have been proposed to introduce alternative new compounds in the paint which are green sources that can reduce environmental risks. Tannins in actuality are large and diverse family of phenolic compound with varying structure and widely distributed through the plant kingdom. It has myriad supplemental functions in a plant’s life cycle, as protective tissue and defense strategies. The phenolic compound is consist of hydroxyl group bonded to an aromatic compound and has the properties to interact with aqueous solution. Phenolic compound is an active compound due to the lower bond dissociation energies of OH group and easier to lose H atom [1]. Hence, tannin containing enough hydroxyl group for encourage effective cross linking of other compounds. Tannin can be divided into two groups called condensed tannins and hydrolysable tannins. Hydrolysable tannins are hydrolysed by enzyme or acid and can be subdivided into ellagitannin and gallotannin while condensed tannins are not readily hydrolysable to simpler molecules and they do not contain a sugar moiety. Condensed tannin have the ability to synthesize mixtures of polymers and oligomers that makes their chemistry typically quite demanding. Tannin contain four flavonoid namely: catechin, epitechin, epigallocatechin and epicatechin gallate which is showed in Figure 1. Due to its flavonoid monomer, tannin have the prospective as corrosion inhibitors for steel in acidic environment [2].

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: Tannins; Inhibitor; Mild steel; Corrosion
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Pn. Hazlinda Abd Rahman
Date Deposited: 16 Jan 2019 01:23
Last Modified: 16 Jan 2019 01:23
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