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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >Fixed-Bed Adsorption Process for Removal of Arsenic Compounds in Natural Gas Streams
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Fixed-Bed Adsorption Process for Removal of Arsenic Compounds in Natural Gas Streams

机译：固定床吸附工艺去除天然气流中的砷化合物

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This investigation concerns the development and demonstration of a field-test treatment facility for the removal and disposal of trace quantities of trialkylarsine compounds from natural gas process streams. These compounds have been observed in well tests throughout the United States and are problematic from both downstream processing and solid waste disposal standpoints. With limits set by interstate pipeline gas quality specifications, gas processors are removing the arsenic compounds using a fixed-bed catalytic adsorption process. Primarily due to the lack of a practical means of regeneration, the fixed-bed catalytic process is costly and results in the production of large quantities of solid waste containing 8 to 10 percent by weight arsenic. A new process being proposed will effectively reduce the amount of hazardous solid waste produced by the arsenic removal process. The proposed process consists of three steps: 1) adsorption in a fixed-bed operation, 2) regeneration/oxidation in air, and 3) water absorption scrubbing. In the regeneration step, the proposed process capitalizes on the rapid reaction of trialkylarsines in air to form more water soluble trialkylarsineoxide and arsenate compounds. The air containing the desorbed arsine species is then stripped in an air-water contact tower effectively entrapping the contaminants in a more manageable water phase. The objective of the program is to demonstrate this new adsorption process as a means of reducing toxic solid waste production while delivering a natural gas process stream with less than 10 μg/m~3 (7 ppb) arsenic with a target of 1 μg/m~3. The research will focus on the selection of the optimum adsorbent system, identification of the key process parameters for regeneration, conversion, and water absorption, process design, and finally, both the solid waste and waste-water disposal methods. The paper will discuss early results in the screening/selection of adsorbent candidates for capture and regeneration and the process design of the demonstration unit for high pressure testing of the adsorption/regneration/absorption process. Each of these two areas will be discussed briefly in the following report. Additionally, the paper will present early work in probing novel chemical pathway to more benign arsenate products.
机译：这项调查涉及开发和演示用于从天然气工艺流中去除和处置痕量三烷基ar化合物的现场测试处理设施。这些化合物已在全美国的试井中观察到，从下游加工和固体废物处置的角度来看都是有问题的。由于州际管线气体质量规范设定了限制，因此气体处理商正在使用固定床催化吸附工艺去除砷化合物。主要由于缺乏实用的再生手段，固定床催化过程成本高昂，并导致产生大量的固体废物，其中含有8至10％重量比的砷。提出的新工艺将有效减少除砷工艺产生的有害固体废物的数量。所提出的过程包括三个步骤：1）在固定床操作中进行吸附，2）空气中的再生/氧化和3）吸水洗涤。在再生步骤中，提出的方法利用了三烷基alkyl在空气中的快速反应，形成了更多的水溶性三烷基ar氧化物和砷酸盐化合物。然后，将含有解吸的砷化氢物质的空气在空气-水接触塔中汽提，从而将污染物有效地截留在更易于控制的水相中。该程序的目的是演示这种新的吸附工艺，以减少有毒固体废物的产生，同时提供天然气工艺流，其砷含量低于10μg/ m〜3（7 ppb），目标为1μg/ m 〜3。研究将集中在最佳吸附剂系统的选择，再生，转化和吸水的关键工艺参数的识别，工艺设计以及最后的固体废物和废水处理方法上。本文将讨论用于捕获和再生的候选吸附剂的筛选/选择的早期结果，以及用于吸附/再生/吸收过程的高压测试的示范装置的工艺设计。以下报告将简要讨论这两个领域。此外，本文将提出探索新的化学途径获得更多良性砷酸盐产品的早期工作。

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