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Process for removal of allylene and allene from hydrocarbon streams

A technology of methyl acetylene and propadiene, which is applied in chemical instruments and methods, organic chemical methods, purification/separation of hydrocarbons, etc., can solve the problems of reducing useful propylene production, and achieve increased unit yield and long reaction time , The effect of saving operating costs

Inactive Publication Date: 2006-01-18
CHEM RES & LICENSING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it does reduce the yield of useful propylene produced

Method used

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  • Process for removal of allylene and allene from hydrocarbon streams
  • Process for removal of allylene and allene from hydrocarbon streams
  • Process for removal of allylene and allene from hydrocarbon streams

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Embodiment Construction

[0052] Detailed description of the preferred embodiment

[0053] The feedstock for immediate processing is usually the bottoms fraction from the deethanizer in an ethylene plant. However, any hydrocarbon stream containing MAPD-contaminated propylene can be a useful feedstock for the process. In a particular embodiment of the invention, a conventional single channel fixed bed reactor, preferably vapor phase, is combined with a distillation column reactor to replace the crude oil column to increase conversion and selectivity. The advantages of using a distillation column reactor instead of a crude oil column are:

[0054] 1. The propylene production from the MAPD converter is increased by 2.5 times, thereby increasing the specific production rate. Catalytic distillation hydrogenation utilizes hydrogen more efficiently, thereby saving operating costs. Attributes of distillation-type reactions, such as limited contact of the product with the catalyst and flushing effects of int...

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Abstract

A process for the selective hydrogenation of the methyl acetylene and propadiene (MAPD) in a propylene rich stream is disclosed wherein the selective hydrogenation is carried out stepwise (a) first in a single pass fixed bed reactor and then (b) in a distillation column reactor containing a supported PdO hydrogenation catalyst which serves as a component of a distillation structure. Conversion and selectivity to propylene in improved over the use of the single pass fixed bed reactor alone.

Description

technical field [0001] The present invention relates to a process for removing MAPD from hydrocarbon streams. More particularly, the present invention relates to a process for the reduction of MAPD to useful propylene by selective hydrogenation, and more particularly to a process wherein one of the hydrogenation reactors is a distillation column reactor in which , while separating propylene from a hydrocarbon stream containing unconverted MAPD. Background technique [0002] Methylacetylene / propadiene (MAPD) ​​is not a compound, but an unstable compound consisting of methylacetylene and propadiene and can be described as follows: [0003] [0004] MAPD compounds are highly reactive pollutants in propylene streams. The most common removal method is selective hydrogenation, which not only removes the pollutants but converts them into useful propylene products. A portion of the hydrocarbon stream containing unconverted MAPD is then removed by fractional distillation of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/09C07C7/167C07C5/08C07B61/00C07C5/05C07C7/00C07C7/163C07C11/06C10G70/02
CPCY10S203/06C07C7/005C10G70/02Y02P20/10C07C7/167
Inventor 斯蒂芬·J·斯坦利加里·R·吉尔德特
Owner CHEM RES & LICENSING CO