Obanla Oyinlola Rukayat, Mohammed Farouk Usman, Alebiosu Olubunmi Samuel, Ojewumi Modupe Elizabeth, Oladimeji Temitayo Elizabeth, Babatunde Damilola Elizabeth
Department of Chemical Engineering, Covenant University, Ota, Ogun State112233, Nigeria.
Product Development Division, Rubber Research Institute of Nigeria, Benin City 300001, Nigeria.
ACS Omega. 2021 Oct 18;6(43):28471-28476. doi: 10.1021/acsomega.0c05810. eCollection 2021 Nov 2.
Rubber seed oil (RSO) () was extracted from rubber seeds by chemical means. The effect of temperature on the oil yield was investigated. The experiment suggested that the maximum yield of the oil occurs at 60 °C. This is a result of the proximity to the boiling point of -hexane, which is about 68 °C. Epoxidized and hydroxylated RSOs were further synthesized by performic acid generated in situ by the reaction of formic acid with 30% hydrogen peroxide. The physiochemical properties of the epoxidized rubber seed oil (ERSO) and hydroxylated rubber seed oil (HRSO) were determined. A separate study was also carried out on castor seed oil (CSO). The improved products were characterized with respect to their configuration and properties. Spectroscopic analysis was carried out on the oil base stocks (RSO, CSO, ERSO, and HRSO). All of the experimental findings were compared with one another. The lubricating properties of CSO and HRSO are further studied as a result of their common hydroxyl nature to ascertain their suitability as a lubricant base. Both oils can be categorized as a nondrying oil with saponification values of 179.52 and 255.25 mgKOH/g, respectively, and as such possess advantageous properties for industrial application. When compared to one another, HRSO appears to be a more effective choice as a lubricant base. This is because of its higher viscosity index of 380.65. The outcomes of this study indicate that hydroxylated and epoxidized RSO with high oxirane content can be synthesized concurrently by one-pot multistep reactions.
通过化学方法从橡胶种子中提取了橡胶籽油（RSO）。研究了温度对出油率的影响。实验表明，在60℃时油的产量最高。这是由于接近正己烷的沸点，正己烷沸点约为68℃。通过甲酸与30%过氧化氢反应原位生成的过甲酸进一步合成了环氧化和羟基化的RSO。测定了环氧化橡胶籽油（ERSO）和羟基化橡胶籽油（HRSO）的理化性质。还对蓖麻油（CSO）进行了单独研究。对改进后的产品进行了构型和性能表征。对油基原料（RSO、CSO、ERSO和HRSO）进行了光谱分析。将所有实验结果相互比较。由于CSO和HRSO具有共同的羟基性质，因此进一步研究了它们的润滑性能，以确定它们作为润滑剂基础油的适用性。两种油均可归类为非干性油，皂化值分别为179.52和255.25mgKOH/g，因此具有工业应用的有利性能。相互比较时，HRSO似乎是更有效的润滑剂基础油选择。这是因为其较高的粘度指数为380.65。本研究结果表明，高环氧乙烷含量的羟基化和环氧化RSO可通过一锅多步反应同时合成。
