Process and apparatus for producing an olefin stream low in oxygenates

A compound and product flow technology, applied in chemical instruments and methods, separation methods, distillation purification/separation, etc., can solve expensive and high-priced problems

Active Publication Date: 2016-03-23
LURGI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially in large-scale industrial installations, this is expensive and expensive

Method used

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  • Process and apparatus for producing an olefin stream low in oxygenates
  • Process and apparatus for producing an olefin stream low in oxygenates

Examples

Experimental program
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Embodiment 1

[0033] Embodiment 1 (invention)

[0034] Experiments were carried out with regard to the distillative separation of a hydrocarbon mixture feed stream, wherein the hydrocarbon mixture feed stream was produced by the Method-controlled upstream olefin synthesis. The hydrocarbon stream to be separated contains ethylene, propylene, propane, butanes and butenes as well as higher hydrocarbons, as well as significant amounts of DME. The separation column used for the distillation separation has a height of 4m and is equipped with a Sulzer type of structured packing. Under the selected process conditions, the separation column has a separation efficiency of 20 theoretical plates, so the theoretical plate height (HETP value) is about 0.20m. The separation column was operated at a pressure of 1.83 MPa(a). The temperature at the bottom of the separation column is from 100 to 120°C and at the top of the column is about 40°C. The reflux ratio was 25. The feed line for the hydrocarbo...

Embodiment 2

[0040] Embodiment 2 (the present invention)

[0041] About the basis The continuous olefin synthesis of method is carried out long-term test, and also according to the separating column that embodiment 1 operates is configured in described Downstream of the synthesis reactor. Due to the continuous aging or deactivation of the catalyst used in the synthesis reactor, DME is no longer completely converted; the concentration of DME in the product stream of the synthesis reactor is therefore constantly increasing. According to the invention, the separation column was operated with a side extractor and for comparison without a side extractor during different tests. In the table below, the measured DME concentration in the overhead product is shown as a function of the operating cycle of the pilot plant and the operating conditions of the side extractor. For comparison, the DME concentration in the hydrocarbon mixture feed stream is also shown as a function of the run time corre...

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Abstract

A process and a plant for producing an olefin stream from a hydrocarbon mixture feed stream, wherein the olefin stream is depleted as regards its content of oxygen-containing organic compounds (oxygenates) as compared to the feed stream. The hydrocarbon mixture feed stream is charged to a separation column operated by a thermal separation process, for example to a distillation column, wherein a material stream enriched in oxygenates is withdrawn via a side outlet and removed from the process. The process according to the invention is particularly useful for processing the product streams obtained in the olefin synthesis by an OTO process.

Description

technical field [0001] The present invention relates to a process for the production of an olefin stream from a hydrocarbon mixture feed stream, wherein said olefin stream is depleted in oxygen-containing organic compound (oxygenate) content compared to said feed stream. In particular, the present invention relates to a process for producing and providing a propylene stream from a hydrocarbon feed stream obtained by reacting oxygenates such as alcohols and / or ethers over molecular sieve catalysts as a product stream in olefin synthesis. The invention also relates to a device for carrying out the method of the invention. Background technique [0002] Hydrocarbon compounds are the basic materials of the chemical industry and raw materials for numerous secondary products. Generally, said hydrocarbon compounds are obtained from primary production processes in the form of mixtures, which have to be separated into individual fractions or pure substances by means of separation met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/04B01D3/00C07C11/06
CPCC07C7/04B01D3/00C07C11/02
Inventor 赫尔曼·巴赫托马斯·伦纳马丁·罗泰梅尔迈克尔·维尔肯
Owner LURGI
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