Spent Acid Handling

Spent acid is handled very carefully. It is very corrosive. Also, its H2SO4 and hydrocarbons may continue to react during storage and transport (Lang, 1998). 

The acid is delivered to the spent acid regeneration plant by  

It is stored in isolated corrosion resistant stainless steel tanks. The spent acids from various sources (e.g. alkylation catalyst, jet fuel catalyst) are stored separately. This avoids unanticipated reactions between their different organic components. 

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Improved feedstock pretreatment is important to minimize catalyst consumption and reduce subsequent spent-catalyst handling requirements. Selective hydrogenation of dienes can be used to reduce acid consumption, both in HF and H2SO4 alkylation (29). More effective adsorptive treating systems have been appHed to remove oxygen-containing contaminants that are frequently introduced in upstream processing steps. 

In the gas cleaning sections of spent acid or metaUurgical sulfuric acid plants, the weak acid scmbbing circuit is typicaUy handled by plastic or glass fiber reinforced plastic (ERP) pipe. The contaminants in weak acid usuaUy vary too greatly to aUow use of an economical aUoy. 

Acid sludge storage and shipping Spent caustic handling Doctor treating... 

The spent acid from trinitration has also been the cause of several disasters, although it had been considered safe to handle. The most noteworthy example of this occurred in the Reinsdorf factory in Germany in 1935. The hot spent acid flowed down to open iron tanks, where, as the liquid cooled, a mixture of di- and tri-nitrotoluenes rose to the surface. It was skimmed off from time to time and transferred to a washing tank, where it was washed with water. On skimming, a rubber glove and a sheif left bn the brim of the tank with some... 

Provide a design for handling the spent acid which is removed from the settler after the sulfonation process in the sodium dodecylbenzene sulfonate process described in Chap. 2. The final waste effluent must meet the waste-disposal standards of EPA. 

Nitration - Separation Washing and Storage Aflcr cparjtion and Handling of Spent Acid Wash Water Handling Decontamination Transportation... 

The first commercial application of the Wellman-Lord process was at the Olin Corp. sulfuric acid regeneration plant in Paulsboro, N. J. This plant regenerates 700 tons of sulfuric acid/day and handles a variety of spent acids. The sulfur dioxide content of the tail gas varies as the blends of these acids change. 

Process Engineering Equipment Aspects. Spent acid treatment and concentration as part of the modern sulfate process were possible only because of the availability of recently improved construction materials and equipment items permitting the safe handling of this highly corrosive substance. 

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