Commercially Proven Technologies for Minimizing Air Toxics Emissions from Benzene, Cumene & Phenol Production Facilities
Publication Date: 2012-Jun-05
The IP.com Prior Art Database
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Commercially-Proven Technologies for Minimizing Air Toxics Emissions From Benzene, Cumene, and Phenol Production Facilities
Hassan M. Gomaa
Product TechnologyManager, Environmental
Ahmed J. Allawi
Senior Process Engineer
The M.W. Kellogg Company
P.O. Box 4557
Houston, TX 77210
Prepared For Presentation At
The Air and Waste Management Association
Annual Meeting Denver, Colorado June 1993
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ly required the
manufacturer to submit a statement describingthe nature and magnitude of emissions from the facility. After review, the declared emission rates would either be accepted as proposed, or emission reduction measures would be imposed.
This study was motivated by two reasons. First, the clientwas considering plans to increase the nameplate capacity of the aromatics complex by 1520%. This expansion required an updated statement of emissions to be submitted. Second, the client was interested in determining the costs of implementing various pollution prevention measures. This study was, therefore, a precursor for developing an overall pollution reduction strategy for the complex.
Kellogg's main objectives were to propose and evaluate credible, commercially- proven emissions control technologies that would achieve s ecific reductions in the levels of volatile or anic compounds (VOCs) and air toxics emitted om the complex. The em hasis
treatment. This paper presents highlights of this study and summarizes its main conclusions.
was placec fon recovery and recycle techniques in order to minimize the costs of end-o -pipe
We begin this presentation with a brief discussion of the process chemistry and the sources of VOC and air toxics emissions.
The benzenek mene/phenol complex employs the traditional four-step phenol
Benzene is produced by the hydro-dealkylation Of c6 - c8 heart-cut:
The aromaticfeedstock to the de-alkylation unit include pyrolysis gasoline and reformate.
(2) Cumene is produced by the alkylation of benzene with propylene over a catalyst:
The M.W. Kellogg Company was recently retained by a European chemical manufacturer to conduct an environmental study aimed at reducing emissions from an aromatics complex consisting of benzene, cumene, and phenol units.
At the time of the study, European environmental standardsfor atmos heric emissionswere not quantified definitively. The regulatory authorities typica
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A large excess of benzene is usually maintained in the cumene reactor to suppress the formation of undesirable side-products.
(3) Cumene hydroperoxide (CHP) is produced by the oxidation of cumene:
(4) Phenol is produced by the cleavage of CHP:
CUMENE WDWP€ROXIM PHENOL
The above cleavagereaction results in the formation of acetone as a co-product.
The main sources of VOC and air toxics emissions from a typical benzene/cumene/phenol complex are:
8 Oxidation Section Vents:...