Slop processing

This chapter covers the design of facilities to handle equipment drainage and contaminated aqueous effluents that are sent for appropriate disposal blowdown drum systems to receive closed safety valve discharges, emergency vapor blowdowns, etc. and facilities for process stream diversion and slop storage. Also covered are criteria for selecting the appropriate method of disposal. Design of flares is covered in a subsequent chapter. 

The first vessel in the blowdown system is therefore an acid-hydrocarbon separator. This drum is provided with a pump to transfer disengaged acid to the spent acid tank. Disengaged liquid hydrocarbon is preferably pumped back to the process, or to slop storage or a regular non-condensible lowdown drum. The vented vapor stream from the acid-hydrocarbon separator is bubbled through a layer of caustic soda solution in a neutralizing drum and is then routed to the flare header. To avoid corrosion in the special acid blowdown system, no releases which may contain water or alkaline solutions are routed into it. 

Slop bringing the explosives truck through process and administrative areas... 

The second slop is to obtain all the information about the process that will be needed for a Ihorongh evaluation including but not limited to the process materials used and their physical properties, the chemistry and tlicnnodynamics of the process, a plant layout, and a description of all the equipment used including controls and instrumentation. The last part of the information gathering step nitty be viewed as the preliminary formation of the What If questions. 

Processing of the refinery slop. A number of refiners process the refinery slop in their desalter. This can adversely affect the... 

The first step in good pretreatment practice is the segregation of major wastewater streams. This frequently simplifies waste treating problems as well as reducing treatment facility costs. Treatment at the source is also helpful in recovering byproducts that otherwise would not be economically recovered from combined wastes downstream [35]. Four major pretreatment processes that are applicable to individual process effluents or groups of effluents within a refinery are sour water stripping, spent caustics treatment, ballast water separation, and slop oil recovery. These are discussed below. 

Separator skimmings, which are generally referred to as slop oil, require treatment before they can be reused because they contain an excess amount of solids and water. Solids and water contents of about 1% generally interfere with processing [38]. 

Step 1. Step 2. Is process filed with FDA No (SO 10 Port III, Slop 3) ... 

Estimate the required size of a batch still, with vapor rectification, to recover a dye intermediate from its coproduct and some low- and high-boiling impurities. It has been specified that 13,000 lb (5900 kg), consisting of fresh reactor product and recycled slop cuts, must be processed per batch. 

This synthetic process is applicable to the preparation of most hydrnzones from aldehydes and ketones. The two-step prepared inn offers several distinct advantage s over the one-step met hod(I) t he yield of hot h slops is high (2) the product is... 

A chemical process operator taped down the acknowledge button on the instrument cabinet to slop an incessant alarm after a level alarm switch had slipped. The alarm switch slipped down its support into a sump and alarmed every few minutes as the sump pump cycled on and off, The acknowledge button, common to a number of alarms, deactivated the whole system. A critical high-temperatme alarm was not. sounded because of this modification. The operator failed to see the alarm light, and the situation eventually led to a hirge toxic vapor release. [1]... 

The addition of tin(II) chloride or tin(II) fluoride, as low-redox-polential reducUtnts. in the dediiizoniation slop of the fluorination of arylamines with polar groups, using hydrogen fluoride in the presence of a nucleophilic fluoride source (e.g., tetrabutylanimonium diliydrogen trifluoride), not only improves the yield of the fluoroaromatic, but al.so allows the fiuorodediazoni-ation process to be performed under milder reaction conditions. ... 

Hydrocarbon waste streams such as off-spec products, slop oils, spent solvents, and off gases (including hydrogen-rich gases) can often be incinerated or used as process fuel. This allows the fuel value of the stream to be recovered, and the waste stream can be assigned a value based on its heat of combustion ... 

Site drainage waters from surface runoff invariably include some oil picked up from small spills and process leaks. These will also be routed through an API separator first, sometimes followed by a dissolved air separator (Fig. 18.8). Oil separated from this drainage water stream will join the slop oil circuit for recycling. During times of desalter operation when water is short, treated site drainage waters may be used for this purpose. Any water in excess of desalter requirements will proceed to an artificially aerated bio-pond for further BOD reduction before discharge [74]. 

Mashing.—The mash is then pumped to the mash tun and water, or liquor from the spent slop tank if a sour mash is desired, is introduced in sufficient quantity to make the ratio of the total mash 40 gallons of liquid per bushel of grain and the batch is agitated while the mashing operation proceeds under temperatures and conditions approximately equivalent to those previously described under mashing processes. ... 

Unless legislation or peculiar local conditions require total evaporation the thin slop is discharged to the sewer or part is returned if process calls for slopping back. ... 

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