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Improving the Corrosion Resistance of Steel and Alloys in Coal-Tar Processing

机译:提高煤炭加工中钢和合金的耐腐蚀性

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The influence of protection by means of soda on the corrosiveness of coal-tar fractions is studied. The corrosion resistance of structural materials used in coal-tar processing is determined. Besides the water present in the tar, corrosion is accelerated by hydrogen sulfide released in the decomposition of the tar's sulfur-bearing compounds. The corrosiveness of the coal-tar fractions is determined over the height of the distillation column. The treatment of tar with sodium phenolate largely binds ammonia salts present in the coal-tar emulsion and also slows hydrogen-sulfide corrosion. That reduces the corrosional losses of structural materials. Industrial tests show that the use of sodium phenolate instead of soda ensures effective corrosion protection of the equipment when its content in the tar is 0.02-0.04%. In that case, the content of sodium ions in the pitch produced will be no more than 0.005-0.0075 wt %.
机译:研究了通过苏打水对煤焦油级分的腐蚀性的影响。 确定了煤焦油加工中使用的结构材料的耐腐蚀性。 除了焦油中存在的水之外,通过在含焦油的含硫化合物的分解中释放的硫化氢加速腐蚀。 在蒸馏塔的高度上测定煤焦油级分的腐蚀性。 用酚酸钠处理焦油大部分结合煤焦油乳液中存在的氨盐,并减缓硫化氢腐蚀。 这减少了结构材料的腐蚀损失。 工业试验表明,当其焦油中的含量为0.02-0.04%时,使用酚醛酸钠代替苏打钠确保了设备的有效腐蚀保护。 在这种情况下,产生的沥青中的钠离子的含量将不大于0.005-0.0075wt%。

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