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首页> 外文会议>AIST steel properties amp; applications conference proceedings combined with MSamp;T' 10 materials science and technology 2010 >Corrosion in Biodiesel Production Process Using High Free Fatty Acid Feedstock
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Corrosion in Biodiesel Production Process Using High Free Fatty Acid Feedstock

机译：高游离脂肪酸原料在生物柴油生产过程中的腐蚀

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摘要

This work aims at investigating corrosiveness of an acid-catalyzed esterification reactor for biodiesel production from low quality feedstock containing high free fatty acid contents. The corrosion investigation was carried out using both electrochemical and weight loss immersion techniques for short-term (3～4 hours) and long-term (up to 7 weeks) exposure tests, respectively. The tested solution was synthesized to simulate the product resulting from biodiesel conversion, which was done by mixing canola oil, oleic acid, methanol and sulphuric acid. The methanol to oil molar ratio ranged from 10:1 to 25:1, and the sulphuric acid concentration was varied from 1 to 5 % by wt of oil. The tested solution was kept at 65℃, and stirred with a rotating speed of 200-300 rpm. The results show that the acid-catalyzed esterification reactor was not corrosive due to the inhibitive nature of free fatty acids. The corrosion rates of carbon steel were low in the range of 0.30 mmpy in seventh week. Corrosion products were oily, loose and black, and only uniform corrosion was found on the carbon steel surface.
机译：这项工作旨在研究一种酸催化的酯化反应器的腐蚀性，该反应器用于从含有高游离脂肪酸含量的低质原料生产生物柴油。采用电化学浸没和失重浸没技术分别进行了短期（3〜4小时）和长期（长达7周）的暴露测试。合成测试溶液以模拟由生物柴油转化产生的产物，这是通过将菜籽油，油酸，甲醇和硫酸混合而完成的。甲醇与油的摩尔比为10：1至25：1，并且硫酸浓度在1至5重量％的油之间变化。将测试溶液保持在65℃，并以200-300rpm的转速搅拌。结果表明，由于游离脂肪酸的抑制性质，酸催化的酯化反应器没有腐蚀性。第七周，碳钢的腐蚀速率较低，为0.30 mmpy。腐蚀产物是油性，疏松和黑色的，并且在碳钢表面上仅发现均匀的腐蚀。

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