Catalytic Methods for Increasing the Unsaturation of Long-Chain Fatty Compounds DEHYDRATION OF CASTOR OIL

Forbes, W. Cameron; Neville, Harvey A.

doi:10.1021/ie50364a025

Cited by 19 publications

(7 citation statements)

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“…The dehydration process is usually carried out at about 250 7C in the presence of catalysts under an inert atmosphere or vacuum [40][41][42][43][44][45][46]. Many catalysts are reported for the dehydration of castor oil, the most widely used being sulfuric acid, sodium bisulfate, phosphoric acid, phthalic anhydride and acid-activated clays [42][43][44][45][46][47].…”

Section: Major Applications and Industrial Products 21 Dehydration Omentioning

confidence: 99%

“…6, during the dehydration process of ricinoleic acid, the hydroxyl group and one of its a hydrogen atoms are removed, yielding a regioisomeric mixture of two acids. The ratio of the two regioisomers and also the cis/trans ratio of the formed double bonds depend on the dehydration conditions [47]. The conjugated acid is likely to undergo polymerization.…”

Section: Major Applications and Industrial Products 21 Dehydration Omentioning

confidence: 99%

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Castor oil as a renewable resource for the chemical industry

Mutlu

Meier

2010

Euro J Lipid Sci & Tech

642

492

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Castor oil is, as many other plant oils, a very valuable renewable resource for the chemical industry. This review article provides an overview on this specialty oil, covering its production and properties. More importantly, the preparation, properties and major application possibilities of chemical derivatives of castor oil are highlighted. Our discussion focuses on application possibilities of castor oil and its derivatives for the synthesis of renewable monomers and polymers. An overview of recent developments in this field is provided and selected examples are discussed in detail, including the preparation and characterization of castor oil-derived polyurethanes, polyesters and polyamides.

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Section: Major Applications and Industrial Products 21 Dehydration Omentioning

confidence: 99%

Section: Major Applications and Industrial Products 21 Dehydration Omentioning

confidence: 99%

Castor oil as a renewable resource for the chemical industry

Mutlu

Meier

2010

Euro J Lipid Sci & Tech

642

492

View full text Add to dashboard Cite

show abstract

“…In order to obtain constant and reproducible results with Wijs solution on dehydrated castor oil, it is necessary to use about 400 per cent excess of reagent, just as in the Hanus number determination. This was shown by Forbes and Neville (IS), who also noticed that the iodine values thus obtained were considerably lower than those calculated from the amount of water formed in the dehydration of castor oil (12). Therefore, if the Wijs number is determined on dehydrated castor oil, using about five times as much reagent as the oil will consume, constant values are obtained which fie about 10 to 15 points below the Hanus number.…”

Section: Determination Of Total Unsaturationmentioning

confidence: 70%

Composition and Analysis of Dehydrated Castor Oil

Priest¹,

Mikusch²

1940

Ind. Eng. Chem.

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“…shortage of lung oil during World War II emphasized the need for the development of an economical process for the isomerization of domestically available nonconjugated oils to conjugated forms. While the alkali isomerization processes described by Kass and Burr (6,12) and Bradley and Richardson (8,5) offer considerable promise, they are relatively cumbersome. Moreover, the properties of these isomerized oils have not met the expectations based upon the amount of conjugation achieved by alkali isomerization (18).…”

Section: Thementioning

confidence: 99%

Catalytic Isomerization of Vegetable Oils: Nickel Catalysts

Radlove¹,

Teeter²,

Bond³

et al. 1946

Ind. Eng. Chem.

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Catalysts have been found which are effective in the isomerization of vegetable oils to conjugated forms. These catalysts include active surface materials such as diatomaceous earth and carbon black, nickel on kieselguhr, and nickel on carbon black. Since these catalysts are neutral, they do not split ester linkages, and no further chemical treatment of the isomerized oil is required. The nickel-on-carbon catalyst is the most effective, particularly when it is prepared by reduction of a suitable nickel salt on Nuchar XXX or Nuchar C-190. When 6 to 8% of reduced catalyst is heated for 6 hours at 170°C. with alkalirefined soybean or linseed oil, 30 to 34% conjugation is obtained. A sample of catalyst may be used to isomerize five to ten hatches of oil before its activity is lost. The treated oils dry in substantially less time than the untreated, and the water and alkali resistances of their films are appreciably improved. A process is proposed for conjugating vegetable oils by the nickel-on-carbon catalyst.

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Catalytic Methods for Increasing the Unsaturation of Long-Chain Fatty Compounds DEHYDRATION OF CASTOR OIL

Cited by 19 publications

References 0 publications

Castor oil as a renewable resource for the chemical industry

Castor oil as a renewable resource for the chemical industry

Composition and Analysis of Dehydrated Castor Oil

Catalytic Isomerization of Vegetable Oils: Nickel Catalysts

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