Device and method for separating rough styrene contained in pyrolysis gasoline

A crude styrene and pyrolysis gasoline technology, applied in distillation purification/separation, petroleum industry, hydrocarbon distillation, etc., can solve the problems of ineffective separation of fractions, high energy consumption, long separation process, etc., and achieve the effect of saving auxiliary equipment

Inactive Publication Date: 2010-06-09
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the long separation process in the prior art, high energy consumption, and the useful component C 5 Fractions are not effectively separated, C 8 The distillate is heated twice, and it is easy to polymerize. A device and method for separating crude styrene in pyrolysis gasoline is provided. A single-tower separation of crude styrene is used to replace the two-tower process in the prior art to achieve energy saving. The effect of investment, while obtaining the useful component C 5

Method used

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  • Device and method for separating rough styrene contained in pyrolysis gasoline
  • Device and method for separating rough styrene contained in pyrolysis gasoline
  • Device and method for separating rough styrene contained in pyrolysis gasoline

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Feed with the raw materials in Table 1, the height of the dividing wall rectification tower H=8300mm, the diameter of 76mm, the height of the dividing wall 7 is 2500mm, the height of the dividing wall 8 is 1500mm, the total number of theoretical plates is 100-110, the pressure at the top of the tower is 1atm, and the feed Feed at the center of zone 2, the feed rate is 10kg / h, the reflux ratio is 2, the liquid distribution ratio (C 6 -C 7 Discharge area 3: feed area 2) is 2:1, tower top discharge 1.5kg / h, C 6 -C 7 Discharge at the center of discharge area 3, side line C 6 -C 7 The production rate is 4.7kg / h, the crude styrene is discharged from the center of the discharge area 5, and the side line C 8 The production rate is 2.5kg / h, the tower top temperature is 15-20℃, C 6 -C 7 The discharge temperature is 80-85°C, the crude styrene discharge temperature is 110-120°C, and the tower kettle temperature is 150-160°C. Under this condition, the tower top C 5 The mass ...

Embodiment 2

[0026] Feed with the raw material of Table 1, in the same dividing wall rectifying tower as embodiment 1, under the same situation of operating conditions, only change the discharge position, side line C 6 -C 7 Outlet position ratio C 6 -C 7 The central position of the discharge area 3 is 5 theoretical plates lower, and the crude styrene discharge position is 3 theoretical plates lower than the central position of the crude styrene discharge area 5. Under this condition, the tower top C 5 The mass percentage content reaches 99.90%; side line C 6 -C 7 In discharge C 5 The massfraction of styrene is 0.85%; the yield of styrene can reach 99.20%, and the tower still C 8 The mass fraction is 0.30%

Embodiment 3

[0028] Table 2 The mass fraction of each component of pyrolysis gasoline

[0029]

[0030] Feed with the raw material of Table 2, in the same dividing wall rectifying tower as embodiment 1, the inlet and outlet position is the same as embodiment 1, tower top pressure 0.5atm, feed rate is 10kg / h, and reflux ratio is 2, and liquid The distribution ratio (C6-C7 discharge area 3: feed area 2) is 1:2, the output at the top of the tower is 1.0kg / h, the recovery rate of side line C6-C7 is 4.7kg / h, and the recovery rate of side line C8 is 3.0 kg / h, the discharge temperature of C6-C7 is 60-75°C, the discharge temperature of crude styrene is 90-100°C, and the temperature of the tower kettle is 130-140°C. Under these conditions, the mass percentage of C5 at the top of the tower reaches more than 99.95%; the mass fraction of C5 in the side line C6-C7 discharge is 0.46%; the yield of styrene can reach 99.50%, and the mass fraction of C8 in the tower kettle is 0.50%. %.

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Abstract

The invention relates to a device for separating rough styrene contained in pyrolysis gasoline, comprising a rectifying tower, partition walls (7, 8), a liquid distributor, a condenser, a tower-top product buffer tank, liquid collectors (15, 16) and a reboiler, wherein the two partition walls (7, 8) divides the rectifying tower into six parts, i.e. a public rectifying area, a feeding area, a C6-C7 discharging area, a steam stripping area, a rough styrene discharging area and a public stripping area; a partition wall segment is from the top end of the partition wall (7) to the bottom end of the partition wall (8); the top of the public rectifying area is provided with a temperature measuring instrument, and light component C5 fractions are extracted in the public rectifying area; the left side of the partition wall (7) is provided with the feeding area, materials enter from the feeding area, the right side of the partition wall (7) is provided with the C6-C7 discharging area, and the C6-C7 fractions are extracted in the C6-C7 discharging area; the left side of the partition wall (8) is provided with the steam stripping area, and the right side of the partition wall (8) is provided with the rough styrene discharging area; heavy component C9 fractions are extracted in the bottom of the public stripping area, and the bottom of the public stripping area is also provided with the temperature measuring instrument. The invention saves two towers and corresponding accessory equipment due to the rectifying tower with the partition walls (7, 8) and saves the energy by more than 30 percent.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, in particular to a device and method for separating crude styrene in pyrolysis gasoline. Background technique [0002] Styrene is an important monomer for the production of polystyrene, ABS resin and styrene-butadiene rubber. The pyrolysis gasoline of pyrolysis ethylene plant contains about 4%-6% styrene. In recent years, more and more enterprises have newly built or expanded ethylene plants with a production capacity of more than 800kt / a, and the production capacity of crude pyrolysis gasoline is increasing. The traditional processing method is for pyrolysis gasoline C 6 -C 8 The distillate undergoes two-stage hydrogenation, in which styrene is saturated into ethylbenzene, which not only causes the concentration of ethylbenzene in the mixed xylene to be too high to be used as isomerization grade xylene, but also wastes a large amount of hydrogen resources. [0003] With the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C7/04C10G7/00
Inventor 裘兆蓉汤文境叶青承民联张新兵杨柳新
Owner JIANGSU POLYTECHNIC UNIVERSITY
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