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Method for separating propane from isopropylbenzene production facility

A technology of cumene and polycumene, which is applied in the field of propane separation in cumene equipment, can solve the problems of high benzene loss rate, high investment, cooling capacity consumption, and large heat, and achieve equipment size reduction and good technology Effect, reduce the effect of project investment

Inactive Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the depropanizer equipment in the prior art has large size, high investment, large cooling capacity and heat consumption, and high benzene loss rate. A new cumene device for separating propane is provided. method

Method used

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  • Method for separating propane from isopropylbenzene production facility
  • Method for separating propane from isopropylbenzene production facility
  • Method for separating propane from isopropylbenzene production facility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] according to figure 2 As shown in the flow chart, stream 3 is composed of raw material benzene fraction, anti-alkylation liquid and alkylation liquid, which respectively enter the middle part of debenzene tower 1 and calculate the 8th tray, 20th tray and 32nd tray from top to bottom Carry out rectifying separation, tower still obtains stream 5, and stream 5 contains cumene and polycumene, but does not contain benzene and propane. The middle part of the debenzene tower 1 is counted from bottom to top at the position of the 49th tray, which is drawn and separated from the side line to obtain benzene stream 8. After the oil-water separation of the overhead stream 4, a stream 6 and water 7 containing part of benzene and all propane are obtained. The number of 1 trays of the debenzene tower is 78, the temperature of the tower bottom is 205°C, the temperature of the top of the tower is 91°C, the pressure of the top of the tower is 0.25MPa, the pressure of the bottom of the ...

Embodiment 2

[0039] By the technical process of [embodiment 1], only the operating pressure of the depropanizer is changed.

[0040] The operating conditions of each unit are shown in Table 3, and the weight percentage composition of raw materials and components of each unit is shown in Table 4.

[0041] Compared with [Comparative Example 1], the equipment size of depropanizer, condenser and reboiler are reduced. The top temperature of the depropanizer is reduced from 58°C to 40°C, and the temperature of the bottom of the tower is reduced from 225°C to 200°C, and the corresponding cooling capacity and heat consumption are reduced; on the other hand, the loss rate of benzene entrained in the discharged propane is reduced from 10.81% to 1.05%.

[0042] table 3

[0043] operating conditions

Debenzene tower 1

Depropanizer 2

Feed temperature (°C)

120

70

The number of trays at the feed (blocks)

8

21

Total number of plates (blocks) ...

Embodiment 3

[0047] According to the technical process of [Example 1], only the operating conditions of debenzene tower 1 and depropanizer 2 are changed.

[0048] The operating conditions of each unit are shown in Table 5, and the weight percentage composition of raw materials and components of each unit is shown in Table 6.

[0049] Compared with [Comparative Example 1], the equipment size of depropanizer, condenser and reboiler are reduced. The top temperature of the depropanizer is reduced from 58°C to 45°C, and the temperature of the bottom of the tower is reduced from 225°C to 210°C, and the corresponding cooling capacity and heat consumption are reduced; on the other hand, the loss rate of benzene entrained in the discharged propane is reduced from 10.81% to 0.66%.

[0050] table 5

[0051] operating conditions

Debenzene tower 1

Depropanizer 2

Feed temperature (°C)

120

70

The number of trays at the feed (blocks)

8

21

Tot...

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Abstract

The invention relates to a method for separating propane from an isopropylbenzene production facility and mainly aims to overcome the problems of a large dimension, high investment, great consumption of cold and heat energy, a high loss rate of benzene of a depropanization tower in the prior art. The method comprises the following steps that: a) a material flow 3 containing benzene, isopropylbenzene, mixed isopropylbenzene and propane enters into the middle part of a debenzolization tower 1 and is subjected to rectification separation, a material flow 4 is obtained at the top of the tower 1, a benzene material flow 8 is pumped from a side line at the middle part of tower 1, a material flow 5 containing isopropylbenzene and mixed isopropylbenzene is obtained at the bottom of the tower 1, and the material flow 8 and the material flow 5 respectively enter into subsequent procedures; b) after the material flow 4 undergoes oil-water separation, a material flow 6 and a material flow 7 are obtained; c) the material flow 6 enters into the middle part of a depropanization tower 2 and is subjected to rectification separation, a material flow 9 containing propane is obtained at the top of the tower 2, and a material flow 10 containing benzene is obtained at the bottom of the tower 2. The method provided in the invention can well solve the above mentioned problems and can be used in industrial production for separation of propane from isopropylbenzene production facilities.

Description

technical field [0001] The invention relates to a method for separating propane by a cumene device. Background technique [0002] Cumene is mainly used as a raw material for the production of phenol, acetone, α-methylstyrene, and spices. It can also be used as an additive for aviation gasoline and as a raw material for cumene hydrogen peroxide and oxidation accelerators. Propylbenzene can also replace benzene as a component of high antiknock gasoline to improve the quality of gasoline. [0003] The raw materials for the preparation of cumene are benzene and propylene. Benzene and propylene are firstly subjected to an alkylation reaction in the alkylation reactor, and polyisopropylbenzene in the alkylation reaction liquid is separated, and then mixed with benzene into the anti-alkylation reactor for transalkylation reaction. Among them, benzene is too much to participate in the reaction and needs to be recycled; and propylene, whether it is polymer grade propylene or chemic...

Claims

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Application Information

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IPC IPC(8): C07C15/085C07C7/04
Inventor 费建良陈柯达徐歆桐何琨郑晓栋杨军褚以健
Owner CHINA PETROLEUM & CHEM CORP
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