On-Site Handling, Storage, and Processing

An electrostatic precipitator is used to remove more tar from coke oven gas. The tar is then sent to storage. Ammonia liquor is also separated from the tar decanter and sent to wastewater treatment after ammonia recovery. Coke oven gas is further cooled in a final cooler. Naphthalene is removed in a separator on the final cooler. Light oil is then removed from the coke oven gas and is fractionated to recover benzene, toluene, and xylene. Some facilities may include an onsite tar distillation unit. The Claus process is normally used to recover sulfur from coke oven gas. During the coke quenching, handling, and screening operation, coke breeze is produced. The breeze is either reused on site (e.g., in the sinter plant) or sold offsite as a by-product. 

Process operation and the storage and handling of effluents and chemicals involve potential chemical and biological hazards (Chapter 5). Safeguards of the type outlined in Chapters 12 and 13 are essential, particularly since the activities are often on a site s periphery and have low manning levels. 

Storage, use, processing, handling, and on-site transportation of flammable and combustible gases, liquids, and solids... 

The Liquid Master Store at Roche uses a 96-tube version of the microtube plate described in Section 1.4 a description of the 96-tube plate is found on the web site www.remp.com. The individually accessible tubes in 96-tube plates in the Liquid Master Store hold a few definite sample volumes, e.g. 26 J,L and 140 J,L per tube. Storage and retrieval of HTS master solutions with fixed sample volumes facilitate the sample logistics considerably. Upon retrieval from the Liquid Master Store, the master solutions in the 96-tube plates are thawed and transferred to 384-well plates before they enter the downstream aliquoting process. This sample-handling concept avoids repetitive freeze-thaw cycles of HTS master solutions and thereby improves the stability and integrity of the compound samples used in HTS. 

Despite the apparent simplicity of the chemistry, the commercial production of phosgene is carried out by a relatively small number of large chemical companies that have developed the know-how to handle the toxic and corrosive phosgene product. Because of its extreme toxicity, most production is captive for immediate use in downstream processes. There is no on-site storage of phosgene, and the phosgene inventory in downstream processes is minimized. 

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