Methanol-to-olefin preparation gas separation process

A technology for methanol to olefins and gas separation, which is applied in the purification/separation of hydrocarbons, distillation purification/separation, ethylene production, etc., to avoid the increase of energy consumption, reduce investment and energy consumption, and enhance the effect of absorption

Inactive Publication Date: 2015-09-23
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the defects of the traditional oil absorption separation process and the current light hydrocarbon separation process, the present

Method used

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  • Methanol-to-olefin preparation gas separation process

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Embodiment Construction

[0022] The reaction gas produced by the catalytic reaction of methanol enters the high and low pressure depropanizer system after step-by-step boosting, drying, and cooling. C4 and its heavier components are separated from the bottom of the tower, and enter the debutanizer system, and C3 and its lighter components are separated from the top of the high-pressure depropanizer, and enter the absorbent separation tower after further compression and cooling , the material is initially separated from carbon 2 and part of carbon 3 in the absorbent separation tower. The gas phase at the top of the absorbent separation tower is condensed to -37°C and enters the demethanizer from the upper part of the tower. The liquid phase of the bottom of the absorbent separation tower is cooled to -37°C and enters the demethanizer from the upper part of the demethanizer as an absorbent middle. The second absorbent of the demethanizer comes from the bottom of the propylene rectification tower. The m...

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Abstract

The invention discloses a methanol-to-olefin preparation gas separation process. According to the invention, a pre-C3-removing process is adopted, and an absorbent separation tower is arranged before a methane-removing tower, such that a material is preliminarily separated. Two streams of different absorbents are adopted in the methane-removing tower, and enter the tower from different positions on the upper part. A main absorbent is a tower kettle material from the absorbent separation tower, and the other stream of absorbent is C2, C3 or a mixture of hydrocarbons thereof from subsequent systems. Compared to prior arts, the process has the advantages of low investment, low energy consumption, high material recovery rate, simple operation, and the like.

Description

technical field [0001] The invention is suitable for producing olefins from oxidation, cracking of hydrocarbons, catalytic reaction of hydrocarbons to produce olefins, and is also applicable to the traditional field of petrochemical ethylene. technical background [0002] Most of the intermediate and final products in the petrochemical industry are based on olefins and aromatics. The ethylene unit is the main production unit for the production of olefins (ethylene, propylene, butadiene) and aromatics. In the past, olefins were mainly produced from naphtha through thermal cracking in tube furnaces. In recent years, due to the shortage of petroleum resources, the technology of methanol to olefins has been gradually developed and entered the stage of industrialization. Methanol-to-olefins technology consists of reaction technology and separation technology. Reaction technology is centered on the development and design of catalysts and reactors, using methanol as raw material ...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C7/00C07C7/04
CPCY02P30/20Y02P30/40
Inventor 陈明辉王松汉张红李莉沈俊肖海焕严政宋作玉鲁耀秦丽英李慧
Owner SINOPEC SHANGHAI ENG
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