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Method for removing O2, N2 and dimethyl ether from olefin streams

A technology of dimethyl ether and logistics, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve the problems of large cooling capacity consumption of demethanizer, affecting product quality, and large loss of olefins, etc., to achieve Guaranteed ethylene recovery rate, reduced desiccant consumption, and stable deep drying effect

Inactive Publication Date: 2011-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the separation process of MTO products in the prior art, the operating temperature is high, olefins are easy to polymerize, and the loss of olefins is large, and O 2 The presence of carbon two hydrogenation catalyst poisoning and into the olefin product affects product quality, and N 2 The existence of the demethanizer leads to the problem of large cooling capacity consumption of the demethanizer, providing a new method for removing O from the olefin stream 2 , N 2 and dimethyl ether method

Method used

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  • Method for removing O2, N2 and dimethyl ether from olefin streams
  • Method for removing O2, N2 and dimethyl ether from olefin streams
  • Method for removing O2, N2 and dimethyl ether from olefin streams

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Wash the compressed olefin stream in the water washing tower, perform oxygenate washing at a gauge pressure of 1.6MPa and 40°C according to the mass ratio of washing water and feed 2.5:1, feed the olefin stream and the top gas phase of the water washing tower after washing The composition of the stream and the bottom liquid phase stream (weight percent composition) is shown in Table 1.

[0044] Table 1

[0045]

Embodiment 2

[0047] according to figure 1As shown, using the process flow of the present invention, the olefin stream with a gauge pressure of 1.65MPa, 40°C, and 50 tons / hour is washed with water under the same conditions as in [Example 1], washed with alkali at a gauge pressure of 1.55MPa, and 40°C, and further compressed To a gauge pressure of 3.8MPa and cooled to 15°C, the liquid water was separated and then dried.

[0048] Table 2

[0049]

Embodiment 3

[0051] use figure 2 Process flow, the olefin stream obtained from the treatment in [Example 2] is further subjected to distillation and separation. The composition of the separated stream 19, stream 21, stream 28 and stream 27 is shown in Table 3. The operating conditions of the demethanizer are as follows: the pressure is 2.75MPa in gauge pressure, the temperature at the bottom of the tower is 12°C, and the temperature at the top of the tower is -65°C. The condensation temperature at the top of the tower is -110°C, the reflux ratio is 30, and the dew point of the stream at the top of the tower is -109°C. The operating conditions of the deethanizer are as follows: the pressure is 1.6MPa in terms of gauge pressure, the temperature at the bottom of the tower is 48°C, and the temperature at the top of the tower is -35°C. The operating conditions of the depropanizer are as follows: the pressure is 0.85 MPa in terms of gauge pressure, the temperature at the bottom of the tower i...

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Abstract

The invention relates to a method for removing O2, N2 and dimethyl ether from olefin streams, mainly solving the problems that in the MTO (methanol to olefin) product separation process in the prior art, the operating temperature is high, olefin is easy to polymerize, the olefin loss is large, the existence of O2 which results in poisoning of a C2 hydrogenation catalyst and enters the olefin product to influence the product quality is not considered, and the existence of N2 results in high cold amount consumption of a demethanizer. The method provided by the invention comprises the following steps: (a) an olefin stream I containing O2, N2, CH4, ethylene, ethane, propylene, propane, dimethyl ether and C4+ hydrocarbon is provided; (b) the olefin stream I enters the demethanizer, a stream II is obtained from the tower top, and a stream III is obtained from the tower bottom; (c) the stream III enters a dethanizer, a stream IV is obtained from the tower top, and a stream V is obtained from the tower bottom; and (d) the stream V enters a depropanizer, a stream VI is obtained from the tower top, and the dimethyl ether and the C4+ hydrocarbon are obtained from the tower bottom. The technical scheme better solves the problems and can be applied to the industrial production of olefin from oxygen-containing compounds.

Description

technical field [0001] The present invention relates to a method for removing O from olefin streams 2 , N 2 and dimethyl ether, in particular to a method for removing contained O from an oxygenate-to-olefins stream 2 , N 2 and dimethyl ether method. Background technique [0002] Low-carbon olefins, especially ethylene and propylene, are the two most important basic organic raw materials in the chemical industry, and are required as raw materials for the preparation of derivative products such as oligomers and polymers (such as polyethylene and polypropylene). At present, ethylene and propylene are basically obtained through petroleum routes. Ethylene is mainly produced through naphtha steam cracking, while propylene is mainly produced from ethylene cogeneration and catalytic cracking. [0003] However, oxygenate feedstocks such as methanol can be an alternative to petroleum feedstocks to make olefins, especially for the production of ethylene and propylene. Typically, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/167C07C11/04C07C11/06C08F110/02C08F110/06
Inventor 胡春谢在库杨为民宗弘元马丽丽
Owner CHINA PETROLEUM & CHEM CORP
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