A Selective Hydrogenation Process of C4 Stream with High Alkyne Content

A technology for selective hydrogenation and high alkynes, which is applied in the purification/separation of hydrocarbons, hydrogenation to hydrocarbons, hydrocarbons, etc. It can solve the problems of complex process, large investment and high difficulty in operation, so as to inhibit deposition and improve economic benefits. , the effect of reducing the temperature rise

Active Publication Date: 2011-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The selective hydrogenation process is not only complicated,

Method used

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  • A Selective Hydrogenation Process of C4 Stream with High Alkyne Content
  • A Selective Hydrogenation Process of C4 Stream with High Alkyne Content

Examples

Experimental program
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Example Embodiment

[0024] Example 1

[0025] The raw material used in this example is the high acetylene carbon four discharged from the industrial butadiene extraction unit. The catalyst adopts the multi-metal selective hydrogenation catalyst described in CN00107257.9, the catalyst carrier is Al2O3, and the metal component content is: palladium 0.2wt %, 11.3wt% copper and 0.2wt% silver. A two-stage adiabatic fixed-bed process is adopted, with a reactor with a catalyst loading volume of 50ml and a reactor with a catalyst loading volume of 20ml. The fresh high alkyne C4 and the C4 recycled from the first stage of the reactor are mixed into the first stage of the reactor, the first stage of the reactor outlet part is recycled to the first stage of the reactor inlet, the rest enters the second stage of the reactor, the circulation ratio is 19. The second stage reactor serves as the terminal reactor. The inlet temperature of the first stage reactor is 30℃, the pressure is 1.6MPa, the ratio of hydroge...

Example Embodiment

[0028] Example 2

[0029] The raw material used in this embodiment is high acetylene carbon four discharged from an industrial butadiene extraction device. The catalyst adopts a palladium / lead selective hydrogenation catalyst, the catalyst carrier is Al2O3, and the metal component content is: palladium 0.3wt%, lead 0.2wt %. A two-stage adiabatic fixed-bed process is adopted, with a reactor with a catalyst loading volume of 50ml and a reactor with a catalyst loading volume of 20ml. Fresh high alkyne C4 and C4 recycled from the first stage of the reactor are mixed into the first stage of the reactor, the first stage of the reactor outlet part is recycled to the first stage of the reactor inlet, the rest enters the second stage of the reactor, the circulation ratio is 19. The second stage reactor serves as the terminal reactor. The inlet temperature of the first stage reactor is 29℃, the pressure is 1.0MPa, the ratio of hydrogen to alkyne is 0.75, and the space velocity (LHSV) is ...

Example Embodiment

[0036] Example 3

[0037] The raw materials used in this embodiment are high acetylene carbon four discharged from an industrial butadiene extraction device. The catalyst adopts a palladium / lead selective hydrogenation catalyst, the catalyst carrier is Al2O3, and the metal component content is: palladium 0.3wt%, lead 0.2wt %. The three-stage adiabatic fixed-bed process is adopted, the catalyst loading of the first stage reactor is 100ml, the second stage reactor is 100ml, and the third stage reactor is 30ml. Fresh high alkyne C4 and C4 recycled from the second-stage reactor are mixed with a certain amount of hydrogen and then enter the first-stage reactor. After the material at the outlet of the first-stage reactor is cooled, a certain amount of hydrogen is fed into the second-stage reactor. The part C4 at the reactor outlet is recycled to the inlet of the first stage reactor, and the remaining part enters the third stage reactor with a circulation ratio of 11. The three-stage ...

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Abstract

The invention relates to a selective hydrogenation process for a C4 material flow with high concentration of alkyne. The selective hydrogenation process comprises the following steps of: enabling the C4 material flow with the high concentration of alkyne to pass through one or more fixed bed hydrogenation reactors (I) with circulation pipelines, carrying out a selective hydrogenation reaction on the C4 mixture with high concentration of alkyne under the action of a catalyst to remove the alkine and generate butadiene and butylene, enabling the reactor to pass through a terminal reactor (II) without the circulation pipeline, and further removing the residual alkyne from the C4 material flow with the low concentration of alkyne. By utilizing the selective hydrogenation process and the catalyst provided by the invention, the concentration of the treated alkyne of the C4 material flow is as high as 20-50wt%, the concentration of alkyne of the hydrogenated C4 material flow can be reduced to below 1.5wt%, and the hydrogenated C4 material flow can be taken as the raw material for a butadiene extract device. According to the selective hydrogenation process disclosed by the invention, the C4 material flow is fully utilized and the yield of the butadiene is increased.

Description

technical field [0001] The invention relates to a selective hydrogenation process for a C4 stream with high alkyne content, belonging to the field of petrochemical industry. technical background [0002] 1,3-Butadiene is an important chemical raw material and the main raw material for the production of synthetic rubber and resin. Polymer grade butadiene requires a purity of greater than 99.7 wt%, and an alkyne content of less than 25 ppm. It is mainly derived from the mixed carbon four of the by-products of hydrocarbon cracking to ethylene. Cracking mixed C4 contains about 40-60wt% of 1,3-butadiene, 0.5-2.0wt% of vinyl acetylene (VA) and ethyl acetylene (EA), and the remaining components are butane, butene and A small amount of 1,2-butadiene, carbon three, carbon five. In order to produce high-purity 1,3-butadiene to meet the requirements of polymerization grade or higher, it is necessary to remove alkyne from the C4 stream. In the industry, butadiene products are mainly...

Claims

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Application Information

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IPC IPC(8): C07C11/167C07C5/09C07C7/167C07C11/08
Inventor 乐毅戴伟朱云仙徐立英彭晖
Owner CHINA PETROLEUM & CHEM CORP
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