Crude rice bran oil (CRBO) is extracted from high-grade rice bran, including the germ and inner husk of brown rice, under controlled processing conditions before further use or consumption. Rice bran is a significant source of rice oil, although a substantial portion continues to be utilized as animal feed rather than being processed for oil recovery. Rice bran oil also has applications in the FMCG, chemical, and pharmaceutical industries because of its nutraceutical components.
Crude rice bran oil is valued for its nutritional characteristics, mild flavour, longer shelf life, and high smoking point of 490 F (254 C), making refined rice bran oil suitable for high-temperature cooking such as stir-frying and deep-frying. However, CRBO with high free fatty acids (FFA) is unsuitable for edible applications and can instead serve as a renewable, low-cost feedstock for biodiesel production. Esterification and transesterification of high-FFA CRBO have also been investigated to produce rice bran oil methyl ester for use in compression ignition engines and to reduce reliance on petroleum-based diesel.
The report identifies growing demand for rice bran oil because of consumer awareness of vitamins, antioxidants, and trans-free fat. It also highlights the use of solvent extraction, particularly with hexane, to recover oil from stabilized rice bran, followed by chemical or physical refining where food-grade specifications are required. The report further notes environmental and safety considerations associated with volatile, flammable, and toxic organic solvents.
| Particulars | Value |
|---|---|
| Plant Capacity | 98.8 MT/Day |
| Land & Building (3885 sq.mt.) | Rs. 4.55 Cr |
| Plant & Machinery | Rs. 5.03 Cr |
| Working Capital for 0.25 Months | Rs. 1.31 Cr |
| Total Capital Investment | Rs. 11.40 Cr |
| Rate of Return | 60% |
| Break Even Point | 67% |
Crude rice bran oil is the oil recovered from rice bran before refining. Rice bran contains the germ and outer layers of the rice kernel and is a significant source of rice oil. The report describes CRBO as a product that can be obtained through mechanical pressing or solvent extraction. Depending on its free fatty acid level and other characteristics, the crude oil may require chemical or physical refining before it can meet food-grade vegetable oil specifications.
Crude rice bran oil can be extracted mechanically or through solvent extraction. In the solvent process described in the report, stabilized rice bran is sent to an extraction area where oil is separated from the bran, producing crude rice bran oil and defatted rice bran. Hexane is identified as the most commonly used solvent because of its extraction efficiency and cost advantages, while ethanol and isopropanol have also been proposed as alternatives. The recovered crude oil can subsequently undergo refining.
Hexane is widely used for rice bran oil extraction because it is effective at recovering oil and is relatively economical for industrial processing. The report notes that solvent extraction can recover oil efficiently from materials with low oil content and from pre-pressed oil cakes. However, hexane is volatile, flammable, and toxic, creating safety and environmental considerations. Industrial facilities therefore require appropriate solvent handling, containment, recovery systems, ventilation, fire protection, pollution control, and occupational safety measures.
After extraction, crude rice bran oil can be subjected to chemical or physical refining to achieve the required specifications. The report identifies desolventisation and distillation as process steps associated with solvent extraction, while the crude oil itself may require further treatment depending on its quality and intended application. High-FFA crude rice bran oil that does not meet edible-oil requirements may also be considered as a feedstock for biodiesel production through processes such as esterification and transesterification.
Rice bran oil is used in edible applications as well as in several industrial sectors. Refined rice bran oil is valued for its mild flavour and high smoking point, making it suitable for high-temperature cooking. The report also identifies applications in FMCG, chemical, and pharmaceutical industries because of its nutraceutical components. When crude rice bran oil has high free fatty acids and is unsuitable for edible use, it can be considered for non-edible applications, including use as a renewable feedstock for biodiesel production.
Key considerations include raw-material availability, extraction technology, solvent handling, utilities, plant layout, equipment selection, environmental management, and occupational safety. A commercial facility also needs suitable systems for desolventisation, distillation, storage, material handling, process control, wastewater treatment, pollution control, and fire protection. Plant location should consider transportation, power and fuel, water supply, waste disposal, labour, regulatory requirements, site characteristics, and community factors. The report also highlights ETP, STP, green-belt, HSE, and risk-management requirements.
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