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Method for recovering pressure energy in natural gas to ethylene plant

An ethylene plant, natural gas technology, applied in separation methods, chemical instruments and methods, climate sustainability, etc., can solve the problem of high energy consumption

Active Publication Date: 2021-05-18
SINOPEC SHANGHAI ENG +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 the problem of high energy consumption in the prior art. It provides a new method for recovering pressure energy in a natural gas ethylene plant, which has the advantage of low energy consumption

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  • Method for recovering pressure energy in natural gas to ethylene plant
  • Method for recovering pressure energy in natural gas to ethylene plant
  • Method for recovering pressure energy in natural gas to ethylene plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking the production scale of 365 tons / year methane oxidative coupling reaction to prepare ethylene pilot plant as an example, a method for recovering pressure energy of a natural gas ethylene plant of the present invention, such as figure 1 As shown, the process flow is as follows: the OCM product gas (10) at the outlet of the methane oxidative coupling reactor enters the bottom of the absorption tower (1) after compressor compression, cooling, and gas-liquid separation. The low-temperature lean liquid absorbent (19) enters the top of the absorption tower (1), and the low-temperature lean liquid absorbent (19) is in countercurrent contact with the OCM product gas (10), and the carbon dioxide in the OCM product gas (10) is absorbed in the absorption tower (1) It is absorbed by the low-temperature lean liquid absorbent (19), and the purified product gas (21) that removes carbon dioxide flows out from the top of the absorption tower (1). The high-pressure rich liquid abs...

Embodiment 2

[0038] Same as [Example 1], only changed to a pilot plant for the production of ethylene by oxidative coupling reaction of methane with a production scale of 1000 tons / year, and a method for recovering pressure energy of a natural gas ethylene plant according to the present invention, which relatively saves 56.02% of external energy supply, The electricity cost is saved by 56,800 yuan per year. See Table 4 for other technical effects and economic benefits achieved.

Embodiment 3

[0040] Same as in [Example 1], except that the production scale is changed to 2000 tons / year methane oxidative coupling reaction to prepare ethylene pilot plant, and a method for recovering pressure energy of a natural gas ethylene plant according to the present invention can save 56.10% of external energy supply relatively, The electricity cost is saved by 113,500 yuan per year. See Table 4 for other technical effects and economic benefits achieved.

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Abstract

The invention relates to a method for recovering pressure energy in a natural gas ethylene plant, which mainly solves the problem of high energy consumption in the prior art. The present invention adopts a method for recovering pressure energy of a natural gas ethylene plant, and a pressure recovery device is set between the absorption tower and the desorption tower, through which the rich liquid absorbent is converted from high pressure to low pressure rich liquid absorbent, and the lean The liquid absorbent is changed from low-pressure to high-pressure lean liquid absorbent, thereby relatively saving 55.17-67.33% of external energy and saving electricity costs of 27,100-3.01 million yuan / year. ethylene plant.

Description

technical field [0001] The invention relates to a method for recovering pressure energy in a natural gas ethylene plant. Background technique [0002] In recent years, a large amount of methane oxidative coupling OCM catalyst trial production and reaction process research have been carried out at home and abroad, in order to achieve the purpose of obtaining ethylene with high selectivity, high conversion rate and high yield. The research on methane oxidative coupling OCM technology in foreign countries is mainly carried out by Siluria Company of the United States; the company realized the high-performance catalytic conversion of ethylene products at relatively low temperatures by using biological templates to precisely synthesize nanowire catalysts. There are also many research units in my country that have carried out a lot of research work. Among them, the Na2WO3-Mn / SiO2 catalyst developed by the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences has relati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C07C2/76C07C11/04
CPCB01D53/1425B01D53/1475C07C2/76C07C11/04Y02P20/10Y02P20/151Y02P20/50Y02C20/40
Inventor 吴德荣何琨李真泽
Owner SINOPEC SHANGHAI ENG