Scrubbing processes temperature after

Spent Sulfuricyicid. Spent sulfuric acid recovered from petrochemical and refinery processes can be fed to a high temperature furnace at 870—1260°C, where it is transformed into sulfur dioxide, water, and other gaseous products. After suitable scrubbing and drying, the gases are passed to a conventional contact sulfuric acid plant (263). 

Alternative technologies to the PSA process for H2 purification include, after the HTS reaction, a low-temperature shift (LTS) reaction followed by C02 scrubbing (e.g., monoethanolamine or hot potash).11 The LTS reaction can increase the H2 yield slightly. However, the product stream, after the HTS, needs to be cooled to about 220 °C. Preferential oxidation (Prox) and/or methanation reaction as shown in Equations 2.6 and 2.7, respectively, removes the traces of CO and C02. The product H2 has a purity of over 97%. 

In this process, the hydrogen generally undergoes pretreatment caustic soda scrubbing to remove H2S and C02, methanatkm to remove CO. The benzene feed and a cyclohexane recycle, mixed with fresh or recycled hydrogen after compression to the required pressure, are preheated, and then introduced into a series of two or three reactors, whose temperatures are staged between 200 and 300°C and which operate... 

Boliden-Norzink process". This removal step is performed after the washing and cooling step in the acid plant hence the gas is dust and SO, free and the temperature is about 30 C. The gas is scrubbed in a packed bed tower with a solution containing mercuric chloride HgCl. This reacts with the vapor of metalHc mercury in the gas and precipitates it as calomel, Hg Cl ... 

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