Kurita provides tailored treatment concepts for refinery applications

Fuel additives to meet specifications.

Biofouling prevention is required, when fuels contain organisms, that can metabolise fuel compounds. The most common microorganisms are fungi and bacteria. They typically live in water but use fuel as a nutrient and oxygen source. The microbes can produce acids, carbon dioxide, hydrogen sulfide and large slime-like growth colonies. Fungi can survive in a low oxygen content environment. Often they are found in combination with bacteria such as Pseudomonas species. Whenever microbes establish themselves, they collect together with an extensive growth. The large areas of growth are called plaques. Plaques are found on the side-walls and on the bottom of the storage tanks.

Fuel additives are necessary for biofouling prevention and corrosion control. Underneath the plaques microbiologically influenced corrosion (MIC) can occur. The metabolic by-products corrode the metal, where pits are produced. Microbes live in pits and extend the corrosion process. In extreme cases, holes through the metal surface will be observed. Microorganisms create severe problems including filter plugging, why fuel additives are used. Most water-based biocides degrade rapidly under alkaline pH conditions. Some commercial biocides degrade in a few days at pH 7. Therefore retreating will be necessary that is detrimental and creates additional costs.

Kurita provides high-performing oil soluble fuel additives to stop corrosion and biofouling. They are applied for biofouling prevention in diesel fuels, heating oils, residual fuels and other petroleum distillates. The growth of bacteria and fungi is eliminated and/or prevented. Our biocides are designed to kill aerobic and anaerobic fungi, bacteria, yeasts and sulphate-reducing bacteria. Benefits are very good anti-corrosive properties with excellent protection against microbial material degradation and sludge formation. Kurita´s fuel biocides are completely biodegradable (OECD 301D / EEC 84/449 C6). They contain no nitrate, nitrosating agents or organically bound chlorine and have no effect on the AOX value.

When hydrogen sulfide is released, Kurita´s oil soluble H2S scavengers rapidly bound the hydrogen sulfide and mercaptans (RSH). The cost-effective treatment provides very low treat rates with high efficacy and thermal stability in fuels.

Kurita´s distillate fuel oil stabilisers are oil soluble additives. Used at a low dosage they stabilise cracked and straight run distillate fuels. The antioxidant properties provide good colour stability with maximum sludge control. They have a high thermal stability and provide peak performance in diesel engines and home burners. These fuel additives provide protection against injector sticking, clogged filters, strainers, nozzles and fouled burner tips. They are not extracted by water under normal handling conditions with no contribution to water haze. The active materials are proven by DEF STAN 91-91 in EMEA.

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