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Method for producing isopropylbenzene by using benzene and propylene

A technology of cumene and polycumene, applied in the field of cumene production, can solve the problem of high n-propylbenzene content, achieve the effect of reducing content and improving product quality

Active Publication Date: 2014-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem that the prior art has a relatively high content of n-propylbenzene in the transalkylation product, and a new method for producing cumene from benzene and propylene is provided

Method used

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  • Method for producing isopropylbenzene by using benzene and propylene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] according to figure 1 The technological process, the catalyst bed of the alkylation reactor is divided into four sections, loaded with 200 grams of shaped catalyst containing MCM-22 zeolite, each section is equipped with 50 grams, and propylene is fed in four sections. The reaction conditions of the alkylation reactor are: reaction temperature 135°C, reaction pressure 2.3MPa, benzene feed rate into the alkylation reactor 780 g / h, propylene feed rate 200 g / h, each section 50 g / h Hour.

[0028]The first transalkylation reactor was charged with 100 grams of shaped catalyst containing Beta zeolite and the second transalkylation reactor was charged with 50 grams of shaped catalyst containing MCM-22 zeolite. The reaction conditions of the first transalkylation reactor are: 150 DEG C of reaction temperature, 1.2MPa of reaction pressure, 100 grams / hour of polycumene feeding amount (streaming 13), 150 grams / hour of benzene feeding amount (streaming 10) . Wherein, the diisopro...

Embodiment 2

[0035] Same as [Example 1], except that the catalyst bed of the alkylation reactor is divided into four sections, and 170 grams of shaped catalysts containing MCM-22 zeolite are loaded, and 35, 40, 45, and 50 grams of propylene are loaded in the four sections successively. Four stage feeding. The reaction conditions of the alkylation reactor are: reaction temperature 140°C, reaction pressure 2.5MPa, benzene feed rate into the alkylation reactor 600 g / h, propylene feed rate 170 g / h, propylene feed into the four stages in sequence The amount is 35, 40, 45, 50 g / h.

[0036] The first transalkylation reactor was loaded with 50 grams of shaped catalyst containing Beta zeolite, and the second transalkylation reactor was loaded with 50 grams of shaped catalyst containing MCM-22 zeolite. The reaction conditions of the first transalkylation reactor are: reaction temperature 150° C., reaction pressure 1.2 MPa, polycumene feed rate 70 g / hour, benzene feed rate 140 g / hour. Wherein, the ...

Embodiment 3

[0043] Same as [Example 2], except that the reaction conditions of the alkylation reactor are: reaction temperature 135° C., reaction pressure 2.5 MPa, benzene feed into the alkylation reactor 600 g / h, propylene feed 120 g / h Hour.

[0044] The first transalkylation reactor was charged with 50 grams of shaped catalyst containing Beta zeolite and the second transalkylation reactor was charged with 50 grams of shaped catalyst containing MCM-56 zeolite. The reaction conditions of the first transalkylation reactor are: reaction temperature 148° C., reaction pressure 1.1 MPa, polycumene feed rate 70 g / hour, benzene feed rate 140 g / hour. Wherein, the diisopropylbenzene content in the stream 13 is 98%. The reaction conditions of the second transalkylation reactor are: reaction temperature 170° C., reaction pressure 1.5 MPa, polycumene feed rate 100 g / hour, benzene feed rate 100 g / hour. Wherein, the content of triisopropylbenzene in stream 14 is 5%.

[0045] Reaction result: the yie...

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Abstract

The invention relates to a method for producing isopropylbenzene by using benzene and propylene and mainly solves the problem of high content of n-propylbenzene existing in an isopropylbenzene product of the prior art. The method better solves the problem and can be applied to the industrial production of isopropylbenzene by adopting the technical scheme which comprises the following steps of: (1) a first stream of benzene material flow 12 and propylene enter an alkylation reactor to react, thereby a material flow 19 comprising the benzene, propylene, isopropylbenzene and polyisopropylbenzene is obtained; (b) the material flow 19 is separated to obtain material flow 23 containing polyisopropylbenzene; (c) after the material flow 23 is separated by a rectifying tower, material flow 13 is obtained at the tower top, and material flow 14 is obtained in the middle part of the tower; (d) a second stream of material flow 10 and the material flow 13 enter a first a first alkyl group transfer reaction zone for carrying out alkyl group transfer reaction to obtain material flow 21; and a third stream of material flow 11 and the material flow 14 enter a second alkyl group transfer reaction zone for carrying out alkyl group transfer reaction to obtain material flow 22; and (e) the material flow 21 and the material flow 22 enter the follow-up refining process, thereby the isopropylbenzene product is obtained.

Description

technical field [0001] The present invention relates to a method for producing cumene from benzene and propylene. Background technique [0002] Cumene is an important organic chemical raw material and the main intermediate compound in the production of phenol, acetone and α-methylstyrene. Industrially, cumene is prepared by the alkylation reaction of propylene and benzene, and its by-product is mainly polycumene. As early as 1945, UOP announced the method of preparing cumene by reacting propylene and benzene in the presence of an acidic catalyst (SPA method) (USP2382318). The SPA method uses solid phosphoric acid as an alkylation catalyst, because solid phosphoric acid cannot catalyze Transalkylation reaction, so there is no transalkylation part in the process flow. Therefore, the SPA method can only operate under the condition of high styrene molar ratio (5-7), and the yield of cumene is only about 95%. In the 1980s, Monsanto developed AlCl 3 The production process of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/085C07C2/66
Inventor 高焕新周斌魏一伦顾瑞芳方华季树芳姚晖
Owner CHINA PETROLEUM & CHEM CORP
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