Fixed-bed reactor and process for producing 2,2-bis(4-hydroxyphenyl)propane with the same

Abstract

The invention can provide a fixed-bed reactor and the preparation of bisphenol A using the same. The fixed-bed reactor has an ion-exchange resin catalyst layer and provided, in a lower part thereof, with a liquid collecting / discharging mechanism through which a reaction product liquid is discharged, the liquid collecting / discharging mechanism comprising: a plurality of inflow pipes provided, at a front end thereof, with a screen or perforated plate for flowing in the reaction product liquid and having a length conforming to a curved surface at the bottom of the fixed-bed reactor; a plurality of liquid collecting pipes connected to a back end of the inflow pipes for collecting the reaction product liquid that has passed through each of the inflow pipes; and a liquid discharging pipe connected to the liquid collecting pipes for discharging the reaction product liquid outside the system. The space in which the catalyst is not filled at the lower part of the reactor can be eliminated through the even flow of the reaction liquid of the filled catalyst layer by the fixed-bed reactor, and thereby improving the product yield of unit volume multiplying by the unit time of the reactor.

Description

technical field [0001] The present invention relates to a fixed bed reactor having an ion exchange resin catalyst layer and a method for producing 2,2-bis(4-hydroxyphenyl)propane (hereinafter sometimes referred to as bisphenol A) using the fixed bed reactor. Background technique [0002] In recent years, the technique of using ion exchange resins as catalysts for organic synthesis reactions has been intensively studied, and various reactions using the ion exchange resins have been put to practical use industrially. This is because post-treatments such as removing the catalyst from the reaction mixture are cumbersome when using a general chemical reagent as a catalyst, while using an ion exchange resin as a catalyst has the advantage of being easy to post-treat the reaction mixture. In particular, a fixed-bed continuous reaction system in which a granular ion exchange resin is filled in a reactor and a raw material is continuously supplied therein for the reaction is advantag...

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Problems solved by technology

[0003] but if image 3 As shown, when the liquid distribution plate 1 is arranged on the upper part of the reactor and the screen 9 is arranged on the lower part, the flow of the reaction liquid passing through the filled catalyst layer is likely to be uneven, and the discharge of the reaction product liquid from the lower part is also likely to be uneven.

Therefore, the total amount of catalyst supplied for use cannot be fully utilized

Additionally, if Figure 4 As shown, when the perforated plate 10 is used, the flow of the reaction solution is uniform, but there is a space not filled with the catalyst in the lower part of the reactor, that is, a dead zone, and the yield of bisphenol A per unit volume and unit time of the reactor becomes worse.

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