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Separation system and method of crude butadiene

A separation system and separation method technology, applied in the field of separation system combining crude butadiene pre-separation and tail gas adsorption, can solve the problems of large absorption oil loss and high energy consumption

Active Publication Date: 2020-10-27
WISON ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] 1) The oil absorption and desorption process installed downstream of the compressed reaction gas has the disadvantages of high energy consumption and large loss of absorbed oil;

Method used

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  • Separation system and method of crude butadiene
  • Separation system and method of crude butadiene
  • Separation system and method of crude butadiene

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Embodiment

[0055] The present invention is described by taking 100,000 tons / year butylene oxidative dehydrogenation to butadiene process simulation calculation results as an example.

[0056] Calculation basic parameter description:

[0057] Carbon four loss: the content of carbon four components in the tail gas is ≤0.1%.

[0058] Annual operating time 8000 hours;

[0059] The air intake of compressor C-1 is 46.71 tons / hour, and the feed composition of the generated gas is shown in Table 1;

[0060] Table 1 Composition of Crude Butadiene

[0061]

[0062] The operating pressure of stripper T-4 is 800kPaG, the temperature at the top of the tower is 282K, and the temperature at the bottom of the tower is 343K;

[0063] Crude butadiene pre-separation tower T-5 has an operating pressure of 400kPaG, a tower top temperature of 320K, and a tower bottom temperature of 396K.

[0064] The operating pressure of light removal tower T-6 is 800kPaG, the temperature at the top of the tower is 27...

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Abstract

The invention relates to a separation system and method of crude butadiene. The crude butadiene separation system comprises a pre-separation tank, an adsorption device, a steam stripping tower and a crude butadiene pre-separation tower, wherein the pre-separation tank is provided with a pre-separation tank inlet, a pre-separation tank tower top gas phase outlet and a pre-separation tank tower bottom liquid phase outlet, the pre-separation tank tower top gas phase outlet is communicated with the adsorption device, and the pre-separation tank tower bottom liquid phase outlet is sequentially communicated with the steam stripping tower and the crude butadiene pre-separation tower. According to the separation system and the separation method, an oil absorption and desorption technology is not adopted, so that loss and recovery of absorbed oil are avoided; the operation at high temperature is avoided, so that equivalently the recovery rate of butadiene is improved, and the operation cost isgreatly reduced; and the comprehensive energy consumption is reduced by about 38.53% in comparison with that of the traditional oil absorption and desorption separation technology, and is saved by 27.75% in comparison with that of the energy-saving crude butadiene separation process mentioned in CN 201710817736.1.

Description

technical field [0001] The invention belongs to the technical field of separation of chemical products, and in particular relates to a separation system and separation method for butadiene produced by oxidative dehydrogenation of butene, in particular to a separation system and separation method combining crude butadiene pre-separation and tail gas adsorption method. Background technique [0002] Butadiene is an important petrochemical basic raw material, used to produce synthetic rubber, synthetic resin, adiponitrile, hexamethylenediamine, nylon 66, sulfolane, 1,4-butanediol, etc. The production methods of butadiene include separation of C4 fractions and synthesis (including butane dehydrogenation, butene dehydrogenation, butene oxidative dehydrogenation, etc.). Almost all butadiene in the world comes directly from the C4 fraction produced when hydrocarbons are cracked to produce ethylene. Production of butadiene through the oxidative dehydrogenation of butene is a comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C11/167B01D53/047
CPCC07C7/00C07C7/04B01D53/047C07C11/167Y02P20/50Y02P20/10
Inventor 徐国辉李延生李云生赵强苗安然高文涛
Owner WISON ENG
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