A method for removing heavy gas components from the reaction of oxidative dehydrogenation to butadiene plant

A technology for oxidative dehydrogenation and gas generation, which is applied in chemical instruments and methods, hydrocarbon purification/separation, organic chemistry, etc. It can solve the problem of increasing the replenishment of fresh absorbing oil, reducing the absorption effect of absorbing oil, and difficult to separate toluene, etc. problems, to achieve the effect of reducing heat, reducing usage, and reducing oil absorption

Active Publication Date: 2021-01-29
WISON ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: 1) in order to improve the absorption effect of the absorption tower, a large amount of absorption oil is needed; 2) heavy components such as benzene and toluene generated by the oxidative dehydrogenation reaction will be dissolved in the absorption oil, and the absorption oil is polluted. A large amount of regeneration is carried out; 3) The boiling points of absorption oils such as toluene and benzene are very close to those of n-hexane and n-heptane, and it is difficult to separate pollutants such as toluene from the absorption oil in the regeneration tower
With the operation of the device, benzene and toluene will accumulate in the absorption oil, thereby reducing the absorption effect of the absorption oil and increasing the supplementary amount of fresh absorption oil

Method used

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  • A method for removing heavy gas components from the reaction of oxidative dehydrogenation to butadiene plant
  • A method for removing heavy gas components from the reaction of oxidative dehydrogenation to butadiene plant
  • A method for removing heavy gas components from the reaction of oxidative dehydrogenation to butadiene plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The reaction product gas enters the reaction product gas / tail gas heat exchanger E-01 and the reaction product gas condenser E-02 in turn, and is partially condensed after heat exchange, and the condensed material is separated into gas and liquid phases in the product gas separation tank V-01 to obtain Uncondensed gas and liquid crude butadiene:

[0042] 1) The uncondensed gas phase enters the oil absorption tower T-02 and contacts with the absorbed oil cooled by the absorbed oil feed cooler E-05 (~0°C) countercurrently, and C4 such as butadiene in the oil absorption tower T-02 The product is absorbed by the absorption oil composed of C6 and C7. At the position of the oil absorption tower T-02 near the tower kettle (that is, the position 10 to 15 trays away from the tower kettle), all the absorption oil is drawn out and passed through the intercooler E-06 of the oil absorption tower. After cooling, return to the lower tray to continue to contact with the gas phase to abso...

Embodiment 2

[0054] Compared with the reaction-generated gas separation process flow of embodiment 1, most of them are the same, except in this embodiment:

[0055] The operating pressure of the generated gas separation tank V-01 is 1.38MPaG, and the operating temperature is 2°C; the operating pressure at the top of the crude butadiene rectifying tower T-01 is 0.4MPaG, the tower top temperature is 35°C, and the tower bottom operating temperature is 130°C; The pressure at the top of the absorption tower T-02 is 1.35MPaG, the temperature at the top of the tower is 2°C, the temperature at the bottom of the tower is 18°C, and the temperature of the material returning to the oil absorption tower from the process side of the intercooler E-06 of the oil absorption tower is 8°C.

Embodiment 3

[0057] Compared with the reaction-generated gas separation process flow of embodiment 1, most of them are the same, except in this embodiment:

[0058] The operating pressure of the generated gas separation tank V-01 is 1.68MPaG, and the operating temperature is 0°C; the operating pressure at the top of the crude butadiene rectifying tower T-01 is 0.55MPaG, the tower top temperature is 55°C, and the operating temperature of the tower bottom is 110°C; The pressure at the top of the absorption tower T-02 is 1.65MPaG, the temperature at the top of the tower is 5°C, the temperature of the bottom of the tower is 28°C, and the temperature of the material returning to the oil absorption tower from the process side of the intercooler E-06 of the oil absorption tower is 12°C.

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Abstract

The invention relates to a method for removing heavier gas components formed by reaction of an oxidative dehydrogenation-producing butadiene device. First, the reaction gas is cooled (0 to 3° C.) to partially condense it, and a crude butadiene rectifying tower is used to condense it down. The heavy components such as benzene and toluene are removed from the liquid phase of the gas, and the uncondensed gas phase re-enters the oil absorption and desorption process to recover the remaining butadiene products. Compared with the prior art, the crude butadiene in the present invention is extracted from the top of the crude butadiene rectifying tower and the side line of the desorption tower respectively, and the crude butadiene obtained at the two places is mixed and then enters the subsequent butadiene. Extraction unit, the reaction generated gas to remove heavy components such as benzene and toluene can reduce the pollution of circulating absorbing oil, reduce the regeneration ratio of absorbing oil and the addition of fresh absorbing oil.

Description

technical field [0001] The invention relates to a method for removing heavy components of gas produced by reaction, in particular to a method for removing heavy components of gas produced by reaction in an oxidative dehydrogenation butadiene plant. Background technique [0002] Butadiene is an important petrochemical basic organic raw material and synthetic rubber monomer. It has a wide range of uses in synthetic rubber and organic synthesis. It can synthesize butadiene rubber (BR), styrene-butadiene rubber (SBR), nitrile rubber ( NBR) and other products, in addition, it can also be used to produce organic chemical products such as adiponitrile, hexamethylenediamine, nylon 66, as well as adhesives, gasoline additives, etc., and has a wide range of uses. [0003] Oxidative dehydrogenation of butene to butadiene is one of the main methods for producing butadiene. The main process flow of the device is generally composed of an oxidative dehydrogenation unit and a butadiene extr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C11/167
CPCC07C7/005C07C11/167
Inventor 苗安然李延生赵强李云生徐国辉常仁杰刘国云
Owner WISON ENG
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