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Method for removing oxy-compounds from olefin material flow

A technology for oxides and compounds, applied in the fields of organic chemistry, distillation purification/separation, etc., can solve problems such as not given, and achieve the effects of reasonable structure, small loss and wide range of water weight content

Active Publication Date: 2011-03-30
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another shortcoming of the above-mentioned method disclosed in CN1549801A is that the water content in the olefin stream entering the distillation tower is required to be no more than 15000wppm, and this method does not provide how to use an effective method before entering the distillation tower when the water content in the olefin stream is greater than 15000wppm. A method for removing water so that the water content in the olefin stream to be entered into the distillation column is not more than 15000wppm

Method used

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  • Method for removing oxy-compounds from olefin material flow
  • Method for removing oxy-compounds from olefin material flow
  • Method for removing oxy-compounds from olefin material flow

Examples

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Embodiment Construction

[0032] Such as image 3 As shown, the cooled stream of the reaction product of oxygenate to olefin is regarded as the olefin stream, or the stream of the reaction product of the reaction product of oxygenate to olefin is contacted with the quenching medium after passing through the quench tower and is regarded as olefin The stream, through the olefin stream line 1, is pressurized by the first compressor 2 and heat-exchanged by the first heat exchanger 3, and then enters the first deoxidation tower 4. The operating pressure at the top of the first deoxidation tower 4 is 0.01 to 0.5 MPa. Preferably 0.12-0.3Mpa, the bottom of the first deoxidation tower 4 can be heated through the first reboiler 8 with steam or other heating medium. The first deoxidation tower 4 overhead stream is a gas mixture containing ethylene, propylene and a small amount of water and oxygen-containing compounds, and enters the first deoxidation tower reflux tank 6 after being cooled and condensed by the fir...

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Abstract

The invention discloses a method for removing oxy-compounds from olefin material flow so as to overcome the defects that ethane and propylene are lost, the treated olefin material flow requires that the water content thereof is not more than 15,000wppm and the like. In the method, the olefin material flow containing the oxy-compounds passes through three oxide removing towers with different pressures in turn to fulfill the aim of removing the oxy-compounds from the olefin material flow, wherein the top operating pressure of the first oxide removing tower is 0.01 to 0.5MPa, the top operating pressure of the second oxide removing tower is 1.5 to 2.2 MPa, and the top operating pressure of the third oxide removing tower is 1.5 to 2.0 MPa. Through the method, under the condition of not adding any absorbent or adsorbent, the oxy-compounds are removed from the olefin material flow, so that oxy-compounds contained in components of the olefin product material flow are less than 1ppm, and the loss of the ethane and propylene is low.

Description

technical field [0001] The present invention relates to a process for the removal of oxygenates from olefin streams. In particular, the present invention relates to a process for the removal of dimethyl ether from an oxygenate to olefin reaction product stream. Background technique [0002] Olefins, especially light olefins such as ethylene and propylene, are desired as feedstocks for the production of derivative products such as oligomers (eg higher olefins) and polymers such as polyethylene and polypropylene. Ethylene and propylene are typically produced from petroleum feedstocks by catalytic cracking or steam cracking. However, oxygenates are becoming an alternative to petroleum feedstocks for the production of light olefins, such as methanol, ethanol, dimethyl ether, methyl ethyl ether, diethyl ether, dimethyl carbonate, and methyl formate, among others. Many of these oxygenates can be produced from a variety of feedstocks including synthesis gas derived from natural g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C11/04C07C11/06
Inventor 熊献金
Owner CHINA PETROCHEMICAL CORP
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