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Butadiene refining method and butadiene refining device

A refining method and refining device technology, applied in chemical instruments and methods, hydrocarbons, organic chemistry, etc., can solve the problems of inability to use butadiene copolymers, reduce the yield of butadiene, and consume a large amount of circulating water. Achieve significant practicality and economic benefits, reduce device investment and operating costs, and improve quality

Pending Publication Date: 2020-06-26
TIANJIN PULAI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when butadiene is partially vaporized into a gas-liquid mixture in the heat exchange tube of the reboiler, it is often prone to copolymerization to form a copolymer, thereby reducing the yield of butadiene and forming too much unusable butadiene. Diene copolymer, the copolymer is usually separated from the heavy part of the weight removal tower and collected as waste, resulting in a large waste of raw materials and unnecessary energy consumption
In addition, the existing method of separating light components and heavy components by using a de-light tower and a de-weight tower respectively has the problems of repeated heating of butadiene, resulting in excessive consumption of steam and excessive consumption of circulating water

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] use figure 2In the process flow shown, the feed rate of crude butene in a plant is 5500kg / h, the feed temperature is 25°C, and the feed pressure is 0.6MPa (absolute pressure). Crude butadiene contains 50ppm p-tert-butylcatechol (TBC), 100ppm water and traces of water-soluble light components (small molecule alcohols and solvents), and the remaining components are butadiene. Crude butadiene is pumped into the bottom of water washing tower C-101 through butadiene buffer tank V-201 by water washing tower feed pump P-401. 100kg / h of process water is fed into the top of the washing tower, and the water temperature is 10°C. The water washing tower is a plate extraction tower with 32 real plates (8 theoretical plates). The wastewater from the water washing tower is discharged into the sewage buffer tank V-203, and the washed crude butadiene is discharged from the top of the water washing tower, which is preheated by the first raw material preheater E-303 and the second raw ...

Embodiment 2

[0037] use figure 2 In the process flow shown, the feed rate of crude butene in a plant is 3300kg / h, the feed temperature is 20°C, and the feed pressure is 0.4MPa (absolute pressure). Crude butadiene contains 30ppm p-tert-butylcatechol (TBC), 50ppm water and traces of water-soluble light components (small molecule alcohols and solvents), and the remaining components are butadiene. Crude butadiene is pumped into the bottom of water washing tower C-101 through butadiene buffer tank V-201 by water washing tower feed pump P-401. 40kg / h of process water is fed into the top of the washing tower, and the water temperature is 5°C. The water washing tower is a plate extraction tower with 24 real plates (6 theoretical plates). The wastewater from the water washing tower is discharged into the sewage buffer tank V-203, and the washed crude butadiene is discharged from the top of the water washing tower, which is preheated by the first raw material preheater E-303 and the second raw ma...

Embodiment 3

[0042] use figure 2 In the process flow shown, the feed rate of crude butene in a plant is 6600kg / h, the feed temperature is 20°C, and the feed pressure is 0.7MPa (absolute pressure). Crude butadiene contains 80ppm p-tert-butylcatechol (TBC), 80ppm water and traces of water-soluble light components (small molecule alcohols and solvents), and the remaining components are butadiene. Crude butadiene is pumped into the bottom of water washing tower C-101 through butadiene buffer tank V-201 by water washing tower feed pump P-401. 130kg / h of process water is fed into the top of the washing tower intermittently, and the water temperature is 18°C. The water washing tower is a packed extraction tower with 10 meters of structured packing (14 theoretical plates). The wastewater from the water washing tower is discharged into the sewage buffer tank V-203, and the washed crude butadiene is discharged from the top of the water washing tower, which is preheated by the first raw material p...

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Abstract

The invention discloses a butadiene refining method and a butadiene refining device. The method comprises the following steps: firstly, extracting crude butadiene by adopting a water scrubber to remove impurities; feeding the washed crude butadiene into a pre-fractionating tower of a dividing wall tower, with a main fractionating tower being at the other side of the dividing wall tower, extractingrefined butadiene from the main fractionating tower side line of the dividing wall tower, extracting a gas phase from the top of the dividing wall tower, after condensation phase splitting, extracting a water phase, completely returning the oil phase, and discharging residual liquid rich in heavy components from the bottom of the dividing wall tower. According to the method, the existing technological process is optimized, the butadiene rectification time is shortened, the possibility of butadiene copolymerization is reduced, and the quality of refined butadiene and the yield of butadiene areremarkably improved; meanwhile, the butadiene dividing wall tower is used as refining equipment, one dividing wall tower realizes the separation function of two conventional rectifying towers, and the device investment and the operation cost are reduced. In addition, a heat exchange system is optimized, steam consumption is greatly reduced, and the method and the device have remarkable practicability and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical refining, and in particular relates to a butadiene refining method and a refining device. Background technique [0002] SBR is the backbone product of synthetic rubber and the largest general-purpose synthetic rubber variety. Styrene butadiene rubber is divided into emulsion polystyrene butadiene rubber and solution polystyrene butadiene rubber. Both emulsion polystyrene butadiene rubber and solution polystyrene butadiene rubber use butadiene and styrene as synthetic monomers. [0003] At present, the refining section of crude butadiene needs to carry out light distillation and heavy distillation respectively after the water washing process. Butadiene needs to be heated once for each rectification, so the current process requires two heatings of butadiene with a reboiler. In the heating process, the reboiler usually uses low-pressure steam as the heat source for heating. If a shell-and-tube he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C11/167
CPCC07C7/005C07C7/04
Inventor 孙立军巢飞
Owner TIANJIN PULAI CHEM TECH
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