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Process for cooling the stream leaving an ethylbenzene dehydrogenation reactor

A technology for catalytic dehydrogenation of ethylbenzene, ethylbenzene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., to achieve the effect of eliminating scaling and clogging problems

Active Publication Date: 2010-11-10
TOTAL PETROKEMIKALZ FRANS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In said prior art, the quench unit only has an overhead effluent

Method used

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  • Process for cooling the stream leaving an ethylbenzene dehydrogenation reactor
  • Process for cooling the stream leaving an ethylbenzene dehydrogenation reactor
  • Process for cooling the stream leaving an ethylbenzene dehydrogenation reactor

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Embodiment Construction

[0026] figure 1 The method according to the invention is described. 10 is the quench tower of step b), 20 is the condenser of step c), 30 is the oil-water separator (separator) and 40 is the oil-water separator of step e). The stream leaving the ethylbenzene dehydrogenation reactor is cooled at about 120-150° C. and sent through line 1 to quench column 10 . The quench column is fed via line 5 with an aqueous phase at about 40°C. The liquid stream 6 leaving the quench column is at about 65°C and the quench column overhead gas is at about 70°C and is sent via line 2 to condenser 20 . The condensed and uncondensed components leaving condenser 20 at about 40° C. are sent via line 3 to oil-water separator 30 , resulting in a gaseous stream 9 , a liquid organic phase 4 and an aqueous phase 5 . Stream 6 leaving said quench column 10 is sent to oil water separator 40 to produce a liquid organic phase 8 and an aqueous phase 7 . Optionally, a mixing tank is inserted on stream 6 ( f...

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Abstract

The present invention is a process for the production of styrene monomer from ethylbenzene comprising the steps of: a) catalytically dehydrogenating said ethylbenzene in the presence of steam thereby catalytically producing a dehydrogenation effluent gas containing essentially unreacted ethylbenzene, styrene monomer, hydrogen, steam and divinylbenzene; b) quenching said effluent gas with an aqueous reflux in at least a quenching column to cool said effluent gas, and thereby obtaining a gas at the overhead and in the bottom a liquid stream warmer than the aqueous reflux; c) condensing said overhead gas thereby producing a liquid organic phase, an aqueous phase and a gaseous phase; d) using a portion or the whole of said aqueous phase of step c) as reflux for said step b) of quenching; e) sending to a decanter the liquid stream obtained at step b) to recover an aqueous phase and an organic phase.

Description

technical field [0001] The present invention relates to a process for cooling a stream leaving an ethylbenzene dehydrogenation reactor. Catalytic dehydrogenation of ethylbenzene to produce styrene is typically carried out at temperatures in the range of about 540-660° C. and at near or even subatmospheric pressures. Typically, in an adiabatic dehydrogenation reactor, a vapor feed of ethylbenzene having a steam to ethylbenzene molar ratio of perhaps 6, 7 or 8 or even higher is passed over a dehydrogenation catalyst such as iron oxide. A large amount of steam is used to provide part of the sensible heat to the dehydrogenation reaction (endothermic reaction), thereby lowering the partial pressure of ethylbenzene to promote the dehydrogenation reaction, and to keep the catalyst free of coke and carbon deposits. The stream (also called effluent gas) leaving the ethylbenzene dehydrogenation reactor mainly contains styrene, hydrogen, unreacted ethylbenzene, benzene, toluene and smal...

Claims

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Application Information

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IPC IPC(8): C07C5/333
CPCC07C2523/745C07C7/09C07C5/333C07C15/46
Inventor 雷诺·德农考特让-皮埃尔·托雷特鲍切特
Owner TOTAL PETROKEMIKALZ FRANS
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