September 2017


Refining: Use of Alloy 400 for hydrofluoric acid corrosion in a refinery alkylation unit

Alkylation units can be based on sulfuric acid or hydrochloric acid as a catalyst.

Alkylation units can be based on sulfuric acid or hydrochloric acid as a catalyst. Hydrochloric acid-based alkylation units are considered here. Alkylation units produce high-octane components for gasoline blending, where isobutane is reacted with various olefin feeds to form alkylate (isoparaffin). Hydrofluoric (HF) acid is a catalyst used for the chemical reaction between isobutene and olefin feeds. The alkylation unit is significant within a refinery and is often subjected to corrosion-related material failure originating from HF acid. While several components in a plant can be subjected to HF corrosion, the focus here is on tubing and piping systems (FIG. 1). The various origins of corr

Log in to view this article.

Not Yet A Subscriber? Here are Your Options.

1) Start a FREE TRIAL SUBSCRIPTION and gain access to all articles in the current issue of Hydrocarbon Processing magazine.

2) SUBSCRIBE to Hydrocarbon Processing magazine in print or digital format and gain ACCESS to the current issue as well as to 3 articles from the HP archives per month. $409 for an annual subscription*.

3) Start a FULL ACCESS PLAN SUBSCRIPTION and regain ACCESS to this article, the current issue, all past issues in the HP Archive, the HP Process Handbooks, HP Market Data, and more. $1,995 for an annual subscription.  For information about group rates or multi-year terms, contact email Peter Ramsay or call +44 20 3409 2240*.

*Access will be granted the next business day.

Related Articles

From the Archive



{{ error }}
{{ comment.comment.Name }} • {{ comment.timeAgo }}
{{ comment.comment.Text }}