Device for preparing styrene through dehydrating phenethyl alcohol as well as method

Abstract

The invention belongs to the field of styrene and discloses a device for preparing styrene through dehydrating phenethyl alcohol. The device comprises a dehydrating tower, a dehydrating tower condenser, a dehydrating tower reflux tank, a dehydrating tower reactor circulating pump and a dehydrating tower reboiler, wherein a catalyst feeding pipeline is connected with a dehydrating tower reactor, and a crude phenethyl alcohol feeding pipeline is connected with an inlet of the dehydrating tower reactor and / or the dehydrating tower reboiler; the top of the dehydrating tower is sequentially connected with the dehydrating tower condenser and the dehydrating tower reflux tank; the dehydrating tower reflux tank is connected with the dehydrating tower; the bottom of the dehydrating tower is sequentially connected with the dehydrating tower reactor circulating pump and the dehydrating tower reboiler; an outlet of the dehydrating tower reboiler is connected with the dehydrating tower; and the dehydrating tower reboiler is a shell-and-tube heat exchanger. According to the device and the method, the dehydrating tower reboiler is used as a reactor, phenethyl alcohol and a catalyst can be uniformly mixed and react immediately after entering the dehydrating tower reboiler, so that the residence time of the phenethyl alcohol is shortened, thus, the size of the reactor is reduced, and the equipment investment is reduced.

Description

technical field [0001] The invention belongs to the field of styrene, and more particularly relates to a device and a method for preparing styrene by dehydrating phenylethyl alcohol. Background technique [0002] Styrenic compounds are important monomers for the synthesis of polystyrene resins, and various substituents on the benzene ring can endow polystyrene resins with various properties, thus adapting to various uses. For example, it is used in the synthesis of ion exchange resins. The obtained ion exchange resins have good mechanical properties and heat resistance, and can be used to prepare high-purity water in thermal power plants, nuclear power plants, nuclear submarines, semiconductor industries, pharmaceuticals, and sugar industries. In addition, styrene compounds can also be used to prepare various functional polymer materials such as photosensitive resins, adhesives, and polymer films, and are suitable for many fields. [0003] One of the current methods for syn...

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Problems solved by technology

This technology is carried out in a reactor, but there are still problems such as long residence time and low heat transfer efficiency

[0004] The inventor has found in research that the phenylethanol dehydration styrene plant in the prior art has the following defects: 1. The residence time of phenylethanol in the reactor is long, The reactor has a large volume and occupies a large investment; 2. The local mixing is uneven, the circulation is poor, and hot spots and dead zones are prone to appear, and overheating is often required to maintain the reaction conversion rate, resulting in a decrease in the selectivity and conversion rate of the main reaction; 3. The reaction zone The internal effective use volume is not high

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