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Method for reducing energy consumption in the process for separation of 1,3-pentadiene from petroleum cracking C5 fraction

A piperylene and petroleum cracking technology, applied in chemical instruments and methods, hydrocarbon purification/separation, hydrocarbons, etc., can solve the problem of high energy consumption and achieve the effect of reducing energy consumption

Active Publication Date: 2015-05-06
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to overcome the defect of higher energy consumption in the process of improving the yield of piperylene products in the prior art, and provide a kind of piperylene product with higher purity and energy saving from petroleum cracking C5 cuts Method for separating piperylene

Method used

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  • Method for reducing energy consumption in the process for separation of 1,3-pentadiene from petroleum cracking C5 fraction
  • Method for reducing energy consumption in the process for separation of 1,3-pentadiene from petroleum cracking C5 fraction
  • Method for reducing energy consumption in the process for separation of 1,3-pentadiene from petroleum cracking C5 fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] according to figure 1 The technological process, the crude oil cracking C5 fraction enters the 75th plate of the isoprene separation tower 1, and the top of the tower is separated to obtain a stream I rich in isoprene, which also contains monoolefins, alkanes, alkynes and a small amount The cyclopentadiene; the tower still separates the stream II containing heavy components such as cyclopentadiene and piperylene. The feed temperature of isoprene separation tower 1 is 50°C, the number of trays is 160, the temperature of the tower bottom is 84°C, the temperature of the top of the tower is 54°C, the pressure of the top of the tower is 0.13MPa, the pressure of the bottom of the tower is 0.21MPa, and the reflux The ratio is 11.

[0060] Stream II enters the first thermal dimerization reactor 2 to carry out the thermal dimerization reaction. The volume of the reactor is 40 cubic meters (the raw material petroleum cracking C5 fraction is calculated at 15,000 kg / hour, the same...

Embodiment 2-4

[0089] according to figure 1 The technological process of separating piperylene from raw petroleum cracking C5 fraction, the difference is that the separation conditions of each tower and the operating conditions of the reactor are shown in Table 3. The recovery rates of piperylene are 90.23%, 96.79 and 96.25%, respectively, and the total heat of the bottom of the double-cycling tower 3 and the weight-removing tower 5 are respectively 96.8, 106.5 and 108.1kW / ton of raw material oil. The total cooling capacities at the top of the heavy tower 5 are respectively 109.2, 110.0 and 111.9 kW / ton of feedstock oil, and the composition and other product properties of the raw petroleum cracking fraction are shown in Table 4 (Example 2) and Table 5 (Example 3) And shown in table 6 (embodiment 4).

[0090] table 3

[0091]

[0092]

[0093] Table 4

[0094]

[0095] table 5

[0096]

[0097] Table 6

[0098]

[0099] As can be seen from the results of the above Examples...

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Abstract

The invention discloses a method for reducing energy consumption in a process for separation of 1,3-pentadiene from petroleum cracking C5 fraction. The method includes the following steps: (a) sending the petroleum cracking C5 fraction into an isoprene separating column (1) for isolation, separating a material flow (I) rich in isoprene from the column top, and separating a material flow (II) rich in cyclopentadiene and 1,3-pentadiene from the column kettle; (b) conducting a thermal dimerization reaction on the material flow (I) and material flow (II) to generate a material flow (III) rich in dicyclopentadiene; (c) sending the material flow (III) in a bicyclo-removal column (3) for isolating the dicyclopentadiene material flow (V), and conducing thermal dimerization on the remaining material (IV) to obtain a material flow (VI) containing trace cyclopentadiene; and (d) sending the material flow (VI) into a de-heavy fractionator (5), acquiring a 1,3-pentadiene product material flow (VII) in the column top, and a material flow (VIII) containing dicyclopentadiene in the column kettle, and sending the material flow (III) and / or material flow (VIII) from the top of the bicyclo-removal column (3) in the column (3). The method of the invention can effectively reduce energy consumption, obtain the 1,3-pentadiene product with high purity of the and obtain the products of 1,3-pentadiene and dicyclopentadiene with higher yield.

Description

technical field [0001] The invention relates to a method for reducing the energy consumption of the process of separating piperylene from the C5 fraction of petroleum cracking. Background technique [0002] A considerable number of C5 fractions are by-produced in the process of petroleum cracking to ethylene, and the C5 fractions are rich in dienes such as isoprene, piperylene and cyclopentadiene. These diolefins are chemically active and are important chemical raw materials. Due to the differences in raw materials, cracking depth and separation degree of petroleum hydrocarbon cracking, the content of diolefins in C5 fractions is different, but the total amount is between 40% and 60%. Therefore, the separation and utilization of C5 fractions has far-reaching significance for improving the economic benefits of ethylene plants and comprehensively utilizing petroleum resources. [0003] Due to the early development and wide application of isoprene among the three C5 diolefins...

Claims

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Application Information

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IPC IPC(8): C07C11/20C07C7/00C07C7/177C07C13/61C07C11/18
Inventor 葛春方杨兆银沙裕吴德荣王江义李真泽张斌徐德勤
Owner SINOPEC SHANGHAI ENG
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