Alkylation Unit - 21,000 BPD & Alkylation Feed Hydrotreater - 15,100 BPD

Stock # 380

Capacity 21,000 BPD

Products Alkylate, Propane, Butane

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Overview

Phoenix Equipment has for sale this 21,000 BPD Alkylation Unit (HF Alky) with Alkylation Feed Hydrotreater (AFHT) capable of 15,100 BPD capacity. The main purpose of the Alkylation Unit is to produce a highly branched iso-paraffin known as Alkylate. This is achieved by reacting light olefins with isobutane using HF (hydrofluoric acid) as a catalyst. The alkylation unit process can be divided into two main phases, reaction and separation. The second unit, the Alkylation Feed Hydrotreater (AFHT) removes diolefins from the Alkylation Unit feed and isomerises certain olefins using a Palladium catalyst. Its function is to reduce acid soluble oil production in the Alkylation Unit, and thus significantly improve throughput. This also results in a higher octane product Alkylate.

Major Equipment

In the reaction phase, the olefin reacts with the isobutane to form alkylate. The reaction takes part in the acid settler riser pipes before entering the acid settler, where the HF settles to the bottom by gravity and hydrocarbon to the top. The HF is then cooled and recirculated. The hydrocarbons enter the separation phase. During the reaction acid soluble oil (or ASO) is formed as a by-product. This is removed from the acid in the rerun column and then burnt in the unit heater. The separation phase splits the hydrocarbons from the top of the settler into 2 streams with one going to the isostripper and the other to the depropaniser. The depropaniser separates the hydrocarbon stream into propane, isobutane and HF, which go back to the reaction phase and alkylate which goes to the isostripper. The isostripper separates its feed streams into isobutane with HF, which goes back to the reaction phase, normal butane that is put into the gasoline pool and alkylate. The most important product from the unit is the alkylate. Alkylate is high octane, low RVP and low sulphur making it an excellent gasoline blending component. There are also propane and butane product streams.