A selective hydrogenation process for C4 stream with high butadiene content

A high-butadiene, selective hydrogenation technology, applied in the petrochemical field, can solve the problems of high operation difficulty, large investment, complex process, etc., and achieve the effects of inhibiting deposition, reducing temperature rise, and long life

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

AI Technical Summary

Problems solved by technology

The selective hydrogenation process is not only complicated, but also difficult to operate and requires a larger investment

Method used

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  • A selective hydrogenation process for C4 stream with high butadiene content
  • A selective hydrogenation process for C4 stream with high butadiene content
  • A selective hydrogenation process for C4 stream with high butadiene content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw material that present embodiment adopts is the mixed carbon four that hydrocarbon steam cracking device produces, and catalyst adopts multi-metal selective hydrogenation catalyst described in CN00107257.9, and catalyst carrier is Al O , metal component content is: palladium 0.2wt%, Copper 11.3wt%, silver 0.2wt%. The two-stage adiabatic fixed-bed process is adopted, the catalyst loading capacity of the first-stage reactor is 50ml, and the catalyst loading amount of the second-stage reactor is 20ml. Freshly mixed C4 and C4 recycled from the first stage reactor are mixed into the first stage reactor, part of the C4 at the outlet of the first stage reactor is recycled to the inlet of the first stage reactor, and the rest enters the second stage reactor, with a circulation ratio of 11.5. The second stage reactor serves as the terminal reactor. The first-stage reactor inlet temperature is 32°C, pressure is 2.0MPa, hydrogen / (butadiene+alkyne) is 0.77mol / mol, space vel...

Embodiment 2

[0033] The raw material used in this embodiment is mixed carbon dioxide produced by a hydrocarbon steam cracking device, the catalyst is a palladium / silver selective hydrogenation catalyst, the catalyst carrier is Al2O3, and the metal component content is: palladium 0.42wt%, silver 0.14wt%. The two-stage adiabatic fixed-bed process is adopted, the catalyst loading capacity of the first-stage reactor is 50ml, and the catalyst loading amount of the second-stage reactor is 20ml. Freshly mixed C4 and C4 recycled from the first stage reactor are mixed into the first stage reactor, part of the C4 at the outlet of the first stage reactor is recycled to the inlet of the first stage reactor, and the rest enters the second stage reactor, with a circulation ratio of 11.5. The second stage reactor serves as the terminal reactor. The first-stage reactor inlet temperature is 29°C, pressure is 2.0MPa, hydrogen / (butadiene+alkyne) is 0.756mol / mol, space velocity (LHSV) is 60h -1 ; The inlet t...

Embodiment 3

[0045] The raw material used in this embodiment is the homokyne carbon four discharged from the industrial butadiene extraction device, and the catalyst is the same catalyst as in Example 2. The three-stage adiabatic fixed-bed process is adopted, the catalyst loading volume of the first-stage reactor is 100ml, the catalyst loading volume of the second-stage reactor is 100ml, and the catalyst loading volume of the terminal reactor is 30ml. Fresh high alkyne C4 and C4 recycled from the second stage reactor are mixed and mixed with a certain amount of hydrogen, and then enter the first stage reactor. After the outlet material of the first stage reactor is cooled, a certain amount of hydrogen is added to the second stage reactor. The reactor outlet part C4 circulates to the first-stage reactor inlet, and the rest enters the third-stage reactor, with a circulation ratio of 19. The three-stage reactor serves as the terminal reactor. The first-stage reactor inlet temperature is 29°C...

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Abstract

The invention relates to a selective hydrogenation process for a C4 material flow with high concentration of butadiene. The selective hydrogenation process comprises the following steps of: enabling the C4 material flow with the high concentration of butadiene 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 butadiene under the action of a catalyst to remove the butadiene and alkyne and generate butylene, enabling the reactor to pass through a terminal reactor (II) without the circulation pipeline, and further removing the residual butadiene and alkyne from the C4 material flow with the low concentration of butadiene. By utilizing the selective hydrogenation process and the catalyst provided by the invention, the controlled concentration range of the butadiene and the C4 alkyne of the C4 material flow is 5-80wt%, the concentrations of the butadiene and the alkyne of the hydrogenated C4 material flow can be respectively reduced to below 10ppm, the selectivity of the 1-butene generation by the butadiene can be more than 50%, and the butadiene can be taken as the raw material of preparing the 1-butene. According to the selective hydrogenation process disclosed by the invention, the C4 material flow is reasonably utilized.

Description

technical field [0001] The invention relates to a selective hydrogenation process for a C4 stream with high butadiene content, belonging to the field of petrochemical industry. technical background [0002] 1-butene is a chemically active olefin, its main use is as a comonomer of linear low density polyethylene (LLDPE), and it is also used to produce polybutene, polybutene ester, heptene and octene Raw materials such as branched or linear olefins, sec-butanol, methyl ethyl ketone, maleic anhydride, butylene oxide, acetic acid, nutraceuticals, and pesticides. Especially since the successful development of LLDPE industrialization technology in the 1970s, with the vigorous development of LLDPE industrial production, the demand for 1-butene at home and abroad has been increasing day by day, and it has become one of the fastest growing chemical products. [0003] Petroleum hydrocarbon cracking ethylene plant produces a large amount of mixed C4, which contains about 40-60 wt% of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/08C07C5/05C07C5/09C07C7/167C07C7/163
CPCY02P20/584
Inventor 乐毅彭晖徐立英戴伟朱云仙
Owner CHINA PETROLEUM & CHEM CORP
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