An Overview of Recycle Streams As a Source of Contamination | AIChE

An Overview of Recycle Streams As a Source of Contamination

Type

Conference Presentation

Conference Type

AIChE Spring Meeting and Global Congress on Process Safety

Presentation Date

April 1, 2019

Duration

35 minutes

Skill Level

Intermediate

PDHs

0.60

To minimize waste, steam crackers tend to feature a range of recycle streams, either internally within the plant, or externally from neighboring units. These recycles can contain compounds that can adversely affect olefin operation. Examples of these factors include: a component returns to its place of origin and results in an increase in concentration e.g. MAPD contaminant ion of recycled propane increases MAPD from furnaces, a component is made and goes to a place upstream of where it is produced e.g. caustic red oil being routed to a primary fractionator a component is added for a specific function but can create a problem elsewhere, an additive in a recycle stream decomposes and produces a new contaminant upstream e.g. nitroxides in light ends fractionators can produce NOx in furnaces which could be a cold box problem,. With these factors in mind, an assessment has been made regarding the origin and impact of a number of common compounds. The effect of recycle streams will vary from site to site. However, there are some common themes and thus a mitigation strategy outline is included

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