Quench water

The carbon black (soot) produced in the partial combustion and electrical discharge processes is of rather small particle si2e and contains substantial amounts of higher (mostly aromatic) hydrocarbons which may render it hydrophobic, sticky, and difficult to remove by filtration. Electrostatic units, combined with water scmbbers, moving coke beds, and bag filters, are used for the removal of soot. The recovery is illustrated by the BASF separation and purification system (23). The bulk of the carbon in the reactor effluent is removed by a water scmbber (quencher). Residual carbon clean-up is by electrostatic filtering in the case of methane feedstock, and by coke particles if the feed is naphtha. Carbon in the quench water is concentrated by flotation, then burned. 

Fig. 51eft. Schematic flow diagram of an ethylene plant using naphtha feedstock. CW = cooling water QW = quench water QO = quench oil LPS = low pressure steam MPS = medium pressure steam SPS = super high pressure steam C3R = propylene refrigerant and...

Park, J. E. and Vance, J. M. Chem. Eng. Progr., 67 (1971) 55. Computer model of crossflow towers PlCOOTTl, M. Hydrocarbon Process., 56(6) (1977) 163. Design quench water towers. 

PlcCTOTTi, M. Hydrocarbon Process., 56(9) (1977) 179. Optimize quench water systems. 

The carbon produced in the flame reaction, and which is subsequently removed as carbon suspension in water, amounts to 1.5 per cent by weight of the fuel oil feedstock charge. Some H2S present in the crude gas is removed by contact with the quench water. 

Trace organic compounds and dissolved solids from the quench water entrained in the steam plume rising from the tower... 

Painting wastewater generally consists of quench water. Wastewater from this operation is generally less toxic than wastewater from the other general operations normally, only the following pollutants are expected to exceed 10 pg/L oil and grease, fluorides, TSS, iron, zinc, bis(2-ethyl-hexyl) phthalate, and diethyl phthalate. 

Quench water Quenching of pipes following annealing Sewered to POTW 49,800 40... 

TVansfer the sin e crystal quickly to the measurement cell while holding a droplet of quenching water on the electrode surface. The single crystal electrodes were lifted to make meniscus, which prevented the side surface of the electrode from touching the electrolyte. 

In agreement with Sallack, if the water or green liquor temperature were high, the explosion probability decreased, but he cites one anomalous case a composition which gave an immediate violent surface explosion in cold water produced a terrificany violent deep explosion in hot quenching water. The blast was heard more than 1 mile away (100 g of smelt was used). 

They also proved that explosions could occur in nitrogen-rich atmospheres and no flame was seen (even when viewed in a darkened room). A few experiments showed that explosions could often be eliminated if enough dissolved material such as methyl or ethyl alcohol, acetone, or ammonia were used in the quench water. Conversely, dissolved stable salts such as NaCI increased the violence of an explosion. (Green liquor would also be included in this list.)... 

There are numerous sources of fumes from the furnace operation, such as dust from the raw materials feeding and fumes emitted from electrode penetrations and tapping. These fumes, which consist of dust, phosphoms vapor (immediately oxidized to phosphoms pentaoxide), and carbon monoxide, are collected and scmbbed. Principal wastewater streams consist of calciner scmbber liquor, phosphoms condenser and other phossy water, and slag-quenching water. 

Casting waste—quench water solids, oil and grease, metals Textile dyeing wastewater solids, color, COD/BOD loading Oily emulsions without surfactants... 

Usually the gas is water-quenched to remove solids and tars. Ammonia, HCN, H2S dissolve in the water and high -content gas at high pressure may produce some formic acid. Purification of quench water contributes secondary Claus feeds, as will be seen. 

Contact with air is no worse than for the general industrial bearings, because most of the systems are now designed substantially closed. However, water contamination is prominent, because of the large quantities of quench water. Demulsibility is highly important oxidation stability probably is next in importance. Antioxidants, antirust agents, and antifoam agents are used in some oils for such service. 

Other sources of silver release to surface waters include textile plant wastewater effluent (Rawlings and Samfield 1979) petroleum refinery effluents (Snider and Manning 1982) and quench water and fly ash scrubber water efflunents from municipal incinerators (Law and Gordon 1979). Silver was detected in 7 of 58 (12%) samples from the National Urban Runoff Program survey (Cole et al. 

Approximately 30% of the energy used in U.S. chemical plants and petroleum refineries is for distillation, and it accounts for nearly 3% of the total U.S. annual energy consumption. The energy usage associated with some specific distillation products is shown in Table III. The cost of energy for distillation can be reduced by using waste heat such as is available from quench water in ethylene plants, for example, or exhaust steam from mechanical drivers such as compressors. 

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