Continuous production method and continuous production device of isobutylbenzene

A continuous production method of isobutylbenzene, comprising the following steps:

• continuously introducing a raw material A and a raw material B into a reactor, and conducting side chain alkylation reaction to obtain an isobutylbenzene-containing reaction liquid, wherein the raw material A comprises toluene and a catalyst, and the raw material B comprises propylene;
• the catalyst in the raw material A has a content of 2 wt % to 3 wt %;
• a molar ratio of the propylene to the toluene is 1:1;
• the side chain alkylation reaction is carried out at a temperature of 195° C. and a pressure of 3 MPa;
• a residence time of the raw material A and the raw material B in the reactor is 30 min;
• and the catalyst is a mixture of an alkali metal and an alkali metal carbonate, and a mass ratio of the alkali metal to the alkali metal carbonate in the catalyst is in a range of 0.5-1.5:1-3;
• continuously discharging the isobutylbenzene-containing reaction liquid, and subjecting the isobutylbenzene-containing reaction liquid to solid-liquid separation to obtain a solid and a first feed liquid, wherein the solid comprises a recovered catalyst, which is recycled for the side chain alkylation reaction;
• subjecting the first feed liquid to first rectification to obtain a second feed liquid and a first gas component, wherein the first gas component is mainly recovered propylene, which is recycled for the side chain alkylation reaction;
• subjecting the second feed liquid to second rectification to obtain a third feed liquid and a second gas component, wherein the second gas component is mainly recovered toluene, which is recycled for the side chain alkylation reaction;
• and
• subjecting the third feed liquid to third rectification to obtain a third gas component, and liquefying the third gas component to obtain the isobutylbenzene;
• wherein a continuous production device for the continuous production method of the isobutylbenzene comprises:
• a reaction kettle;
• a first storage tank and a second storage tank communicating with a feed port of the reaction kettle, respectively;
• a hydrocyclone communicating with a discharge port of the reaction kettle;
• a first rectification column communicating with an overflow outlet of the hydrocyclone, wherein an underflow outlet of the hydrocyclone communicates with the reaction kettle;
• a second rectification column communicating with a column-bottom discharge port of the first rectification column, wherein a column-top discharge port of the first rectification column communicates with the first storage tank;
• and
• a third rectification column communicating with a column-bottom discharge port of the second rectification column, wherein a column-top discharge port of the second rectification column communicates with the second storage tank.