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Process for preparing butadiene through oxidative dehydrogenation of butene

A technology for oxidative dehydrogenation and butadiene, which is applied in the chemical industry, sustainable manufacturing/processing, organic chemistry, etc., can solve the problems of easy crushing of catalysts, large total steam consumption, loss and consumption, and achieve short flow channels, The effect of large production capacity and low resistance

Inactive Publication Date: 2012-09-19
HUNAN BAILI ENGINEERING SCIENCE AND TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The butene oxidative dehydrogenation fluidized bed reactor process has the disadvantages that the catalyst is easily crushed, lost and high consumption, and the total steam consumption is large; while the existing butene oxidative dehydrogenation process is a two-stage oxidation reaction process (such as figure 1 ), using an adiabatic axial fixed-bed reactor

Method used

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  • Process for preparing butadiene through oxidative dehydrogenation of butene
  • Process for preparing butadiene through oxidative dehydrogenation of butene
  • Process for preparing butadiene through oxidative dehydrogenation of butene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The oxidative dehydrogenation process of the butadiene plant with an annual output of 100,000 tons adopts the three-stage oxidation reaction process of the present invention. The adiabatic fixed-bed reactors are 3 units in one group, steam is added to the first stage, water is added to the second and third stages, and each stage is reacted. The percentage of butene added is: 40:30:30.

[0023] Add 0.7MPa.G medium pressure steam in the first stage: 50 tons / hour.

[0024] The amount of water added in the second stage: 0.5 tons / hour.

[0025] The amount of water added in the third stage: 0.5 tons / hour.

[0026] The third stage by-product 0.7MPa.G medium pressure steam volume: 33.7 tons / hour.

[0027] The third stage by-product 0.3MPa.G low pressure steam volume: 2.3 tons / hour.

[0028] Total water to olefin ratio: 7.2:1.

[0029] Medium-pressure steam consumption: 16.3 tons / hour (the amount of medium-pressure steam added in the first stage minus the amount of by-produc...

Embodiment 2

[0035] The oxidative dehydrogenation process of the butadiene plant with an annual output of 100,000 tons adopts the three-stage oxidation reaction process of the present invention. Join percentage: 45:30:25.

[0036] Add 0.7MPa.G medium pressure steam in the first stage: 54 tons / hour.

[0037] The amount of water added in the second stage: 0.7 tons / hour.

[0038] The amount of water added in the third stage: 0.5 tons / hour.

[0039] The third stage by-product 0.7MPa.G medium pressure steam volume: 33.3 tons / hour.

[0040] The third stage by-product 0.3MPa.G low pressure steam volume: 2.3 tons / hour.

[0041] Total water-ene ratio: 7.5:1.

[0042] Medium-pressure steam consumption: 20.7 tons / hour (the amount of medium-pressure steam added in the first stage minus the amount of by-product medium-pressure steam in the third stage).

[0043] Medium-pressure steam consumption per ton of butadiene: 1.656 tons / ton of butadiene.

[0044] When adopting two-stage adiabatic fixed-be...

Embodiment 3

[0048] The oxidative dehydrogenation process of the butadiene plant with an annual output of 100,000 tons adopts the three-stage oxidation reaction process of the present invention. The joining percentage is: 45:35:20.

[0049] Add 0.7MPa.G medium pressure steam in the first stage: 54 tons / hour.

[0050] The amount of water added in the second stage: 0.1 t / h.

[0051] The amount of water added in the third stage: 1.2 tons / hour.

[0052] The third stage by-product 0.7MPa.G medium pressure steam volume: 36.1 tons / hour.

[0053] The third stage by-product 0.3MPa.G low pressure steam volume: 2.3 tons / hour.

[0054] Total water-ene ratio: 7.5:1.

[0055] Medium-pressure steam consumption: 17.9 tons / hour (the amount of medium-pressure steam added in the first stage minus the amount of by-product medium-pressure steam in the third stage).

[0056] Medium-pressure steam consumption per ton of butadiene: 1.432 tons / ton of butadiene.

[0057] When adopting two-stage adiabatic fixe...

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Abstract

The invention relates to a process for preparing butadiene through the oxidative dehydrogenation of butene on an adiabatic radial fixed bed. The process comprises the step of performing oxidative dehydrogenation reaction of butene, air and water vapor in an adiabatic radial fixed bed reactor to obtain the butadiene. The radial fixed bed reactor is divided into three sections (or three stages); and process equipment sequentially comprises a first-section reactor, a first-section recuperative heat exchanger, a second-section reactor, a second-section recuperative heat exchanger, a third-section reactor, a medium-pressure steam generator, a low-pressure steam generator, a rear heat exchanger and the like. The preparation process is technically characterized in that the yield of the butadiene is high, the selectivity is high, the production device has high production capacity, the unit consumption of steam is low, and the heat energy is reasonably utilized; and the yield of wastewater, the pretreatment capacity of internal wastewater and the discharge amount of sewage can also be effectively reduced.

Description

technical field [0001] The invention relates to a process for preparing butadiene by oxidative dehydrogenation of butene, and belongs to the technical field of chemical industry. Background technique [0002] Butadiene is the main raw material of synthetic rubber and other chemical products, such as butadiene rubber, nitrile rubber, styrene butadiene rubber, SBC thermoplastic elastomer, ABS engineering plastics, adiponitrile, hexamethylene diamine, 1,4-butanediene Alcohol etc. [0003] At present, domestic and foreign production methods of butadiene mainly include steam cracking process (ethylene plant) and butene oxidative dehydrogenation process. In the past two decades, butene oxidative dehydrogenation technology has been almost stagnant due to the development of steam cracking process. [0004] In recent years, many sets of steam cracking units, refinery catalytic units and methanol-to-olefin units have been built in China, and a large amount of mixed C4 has been by-pr...

Claims

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Application Information

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IPC IPC(8): C07C11/16C07C5/42
CPCY02P20/10
Inventor 李文辉王昌飞蔡日新
Owner HUNAN BAILI ENGINEERING SCIENCE AND TECHNOLOGY CO LTD
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