Device and method for separating light-colored C9 fraction of cracking
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A cracked carbon, light-colored technology, applied in fractional distillation, hydrocarbon distillation, petroleum industry, etc., can solve the problems of low yield of light-colored cracked carbon 9, long process, high energy consumption, etc.
Inactive Publication Date: 2010-06-02
JIANGSU POLYTECHNIC UNIVERSITY
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[0010] The present invention proposes a device for separating light-colored cracked C9 fractions in order to overcome the shortcomings of long process, high
Method used
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Embodiment 1
[0031] Embodiment 1: adopt sleeve tower separation cracking carbon nine, process condition is: processing capacity is 23905kg / h, C in the raw material 6 ~C 8 The mass fraction is 70.67%, the output at the top of the tower is 16646.1kg / h, and the C at the top of the tower is 6 ~C 8 The quality score is 99.2%. The output of light-colored pyrolysis carbon 9 is 5400kg / h, the outer tower feeds, the inner cylinder discharges, and the liquid distribution ratio (inner rectification cylinder 2: outer rectification tower body 3) is 1:2. The technical parameters of the sleeve tower are shown in Table 2.
[0032] Table 2 Sleeve column separation and cracking carbon nine process parameters list
[0033] project
sleeve tower
total
Tower top pressure (absolute pressure), KPa
21
Tower top temperature, °C
53
Tower kettle temperature, ℃
150
Number of theoretical plates
33
33
Reflux ratio
1.1
...
Embodiment 2
[0036] Embodiment 2: adopt sleeve tower separation cracking carbon nine, process condition is: processing capacity is 23905kg / h, C in the raw material 6 ~C 8 The mass fraction is 75.43%, the output at the top of the tower is 18000.1kg / h, and the C at the top of the tower is 6 ~C 8 The quality score is 99.3%. The output of light-colored pyrolysis carbon 9 is 4500kg / h, the outer tower feeds, the inner cylinder discharges, and the liquid distribution ratio (inner rectification cylinder 2: outer rectification tower body 3) is 1:2. The technical parameters of the sleeve tower are shown in Table 3.
[0037] Table 3 Separation and cracking carbon nine process parameters list of sleeve tower
[0038] project
sleeve tower
total
Tower top pressure (absolute pressure), KPa
25
Tower top temperature, °C
52.6
Tower kettle temperature, ℃
166
Number of theoretical plates
31
31
Reflux ratio
1.1
...
Embodiment 3
[0041] Embodiment 3: Under the same operating conditions as in Embodiment 2, only the position of feeding and discharging is changed, the inner cylinder is selected to feed, and the outer tower is discharged. The result obtained is the same as that of Embodiment 2.
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Abstract
The invention discloses a device for separating a light-colored C9 fraction of cracking, which comprises a sleeve tower, a condenser, an overhead product accumulator tank and a tower bottom reboiler, wherein the inside of a rectifying tower is sleeved with an internal rectifying cylinder body, so the whole rectifying tower is divided into four parts, namely a public rectifying area, a public stripping area, the internal rectifying cylinder body and the external rectifying tower body, and the inside of the rectifying tower is provided with a tower plate or a filler; the part above the internal rectifying cylinder body is the public rectifying area, the top part of the public rectifying area is provided with an outlet for C6 to C8 fractions, and a raw material inlet or at least one outlet for the light-colored C9 product of the cracking are arranged in the internal rectifying cylinder body; and the part below the internal rectifying cylinder body is the public stripping area, and the bottom part of the public stripping area is provided with a heavy component outlet. The raw material is introduced from the middle upper part of the external rectifying tower body and is separated primarily in the external rectifying tower body, the separation of light components from medium components is completed in the upper part of the internal rectifying cylinder body, and the separation of heavy components from the medium components is completed in the lower part of the internal rectifying cylinder body. Compared with the traditional separation method, the method can save about 30 percent of energy and improve product yield.
Description
technical field [0001] The invention belongs to the technical field of petrochemical industry and relates to a device and method for separating light-colored cracked carbon nine fractions. Background technique [0002] Cracked carbon nine is a by-product of ethylene cracking, and its yield is 10% to 20% of that of ethylene. The composition of cracked carbon nine is related to cracking depth and cracking process. However, the most important factor affecting the composition of cracked carbon nine is the pyrolysis gasoline (C 5 ~C 9 ) separation process. According to the separation process of pyrolysis gasoline, there are mainly three cracked C9 fractions: (1) unhydrocracked C9 fraction (2) one-stage hydrocracked C9 fraction (3) fully hydrocracked C9 fraction. [0003] At present, the comprehensive development and utilization of unhydrocracked carbon nine fractions are mainly carried out. The composition of unhydrocracked carbon nine is extremely complex, with more than tw...
Claims
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