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Process for producing styrene

A technology of styrene and phenylethanol, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, and production of hydrocarbons from oxygen-containing organic compounds, etc., which can solve problems such as high cost, fouling of heat exchangers, and time-consuming

Active Publication Date: 2018-07-31
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The disadvantage of producing styrene via the SM / PO process described above is that during the purification and treatment of the product stream, styrene must be separated from the water and thus be present in the wastewater stream, and can polymerize and cause Scale build-up in heat exchangers in treatment plants
[0014] This fouling necessitates the routine cleaning of heat exchange equipment in wastewater plants, which is costly and time consuming

Method used

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  • Process for producing styrene
  • Process for producing styrene
  • Process for producing styrene

Examples

Experimental program
Comparison scheme
Effect test

example

[0052] By computer simulation (using Aspen modeling software) figure 1 Examples are obtained with the reactor setup shown in .

[0053] Table 1 shows the stripper simulated using the "new steam" C-2 The result of the stripping process.

[0054] The simulation provided information on the key components of the composition of the streams flowing into and out of the column ( figure 1 for each specified stream in ).

[0055] Table 1

[0056]

[0057] Feedwater flow in Table 1 5 Contains 519ppm styrene. In contrast, it is clear from Table 1 that after step (e) of the process of the present invention is applied, the stripped water stream 8 Basically free of styrene.

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Abstract

The invention relates to a process for the preparation of styrene or substituted styrenes comprising the steps of: (a) subjecting a feed containing 1-phenyl ethanol or substituted 1-phenyl ethanol toa dehydration treatment in the presence of a suitable dehydration catalyst; (b) subjecting the resulting product mixture to a separation treatment, thus obtaining a stream containing water and styreneor substituted styrene and a residual fraction containing heavy ends; (c) treating the stream containing water and styrene or substituted styrene with a base; (d) separating the treated stream of step (c) into a styrene or substituted styrene-rich product stream and a styrene or substituted styrene-lean waste water stream; (e) treating the styrene or substituted styrene-lean waste water stream with steam in a stripping column, thus obtaining a treated waste water stream and a treated stream comprising steam and styrene or substituted styrene.

Description

technical field [0001] The present invention relates to a process for the production of styrene. Background technique [0002] Processes for the joint production of styrene and propylene oxide are well known in the art and are commonly referred to as the styrene monomer / propylene oxide (SM / PO) process. [0003] In general, the SM / PO method consists of the following steps: [0004] (a) reacting ethylene with benzene to form ethylbenzene, [0005] (b) reacting ethylbenzene with oxygen or air to form ethylbenzene hydroperoxide, [0006] (c) reacting at least a portion of the resulting ethylbenzene hydroperoxide with propylene in the presence of an epoxidation catalyst to form propylene oxide and 1-phenylethanol (also known as methylphenylcarbinol (MPC)), and [0007] (d) dehydrating at least a portion of the resulting 1-phenylethanol to styrene in the presence of a suitable dehydration catalyst. [0008] Step (a) above may be performed as an integral part of the SM / PO metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/24C07C7/00C07C7/05C07C7/10C07C15/46C07D301/19
CPCC07C7/005C07C7/05C07C7/10C07C1/24C07C15/46C07C7/11C07C2521/04
Inventor A·范莫雷克
Owner SHELL INT RES MAATSCHAPPIJ BV