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Fractionation

The Distinctive Features are:
Low HA -> less 2MBF -> less utilities Optimal Cleavage product composition -> low cresol -> high phenol quality

CHP cleavage product, containing very low HA and carbonyls, is directed to Phenol and Acetone Fractionation. In the first Fractionation Column, acetone, cumene, a portion of AMS, and light components are separated from phenol and heavy ends.

Due to lower HA content in the first column feed, less 2MBF is formed. Low HA content in the feed to the first Fractionation Column makes it possible to employ column trays which are not as highly efficient as in other known processes - this reduces either capital costs for a grass root plant or utilities consumption for a revamp.

First column distillate is subject to further fractionation to recover product acetone and produce an AMS-cumene fraction. The AMS-cumene fraction is then directed to either AMS Hydrogenation or final AMS Production.

Acetone Product with High Stability to Oxidation

The Distinctive Feature is KT value of at least 15 hours

Production of final acetone with high stability to oxidation is based on ILLA's unique technology, which allows effective removal of impurities such as aldehydes and aldols from crude acetone, because said impurities have an adverse impact on acetone stability to oxidation. This process employs a two-column system where aldehydes are removed at the first column by an alkaline treatment of the stream. To prevent aldols condensation products from entering the Acetone Finishing Column, the first column stream that constitutes the feed of the Acetone Finishing Column is taken off in a vapor phase as a side cut wherefrom aldols are removed using a partial condenser. In ILLA's technology, the acetone product features an extremely low impurities content and its stability to oxidation exceeds 15 hours, unlike that in previously-known processes, in which this factor is only 2-4 hours and acetone stability sometimes falls to 10-20 min.

Phenol Fractionation Technology

Distinctive features:

    - 

lower steam consumption

    - 

easy and flexible control over column conditions at variable and higher feed-rates

Phenol Fractionation Technology comprises a three-column Fractionation System. Resulting from the Hydroxyacetone Removal from CHP Cleavage Product Process, phenol streams feature a low 2-MBF content. It is a known fact that 2MBF can be separated from phenol in conventional processes only via high energy consuming hydro-extractive distillation. ILLA's Fractionation Process is more advantageous due to utilization of non-standard technology for HA removal, which provides very low 2MBF content in the recovered finished products. Therefore, steam consumption in hydro-extractive distillation column is very low as compared to other technologies.

 

 


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