Elimination of caustic prewash in the fixed bed sweetening of hi

Details Elimination of caustic prewash in the fixed bed sweetening of hi Elimination of caustic prewash in the fixed bed sweetening of hi

1990-03-19

1991-08-13

Myers, Helane E.

Mineral oils: processes and products

Refining

Sweetening

208189, 208203, 208263, C10G 2710

Patent

active

050393987

ABSTRACT:
Although high naphthenic acid hydrocarbon feedstocks normally need to be washed with caustic prior to being sweetened in a fixed bed mercaptan-to-disulfide oxidation process to avoid bed plugging, the prewash can be eliminated if aqueous ammonia is used concurrent with and as a part of the sweetening process. Aqueous ammonia injected into a sour hydrocarbon stream prior to the sweetening zone not only eliminates bed plugging, but affords an aqueous phase from which naphthenic acids may be recovered easily and economically. The ammonia also can be recovered for reuse, affording a process with considerably enhanced economic return.

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