Process and device for recovering C2 materials in ethylene device
An ethylene device and material technology, which is applied to the carbon 2 material recovery process and device field, can solve the problems of carbon 2 material waste and pollution, and achieve the effects of reducing pollution, accelerating the cooling speed and shortening the driving time.
Inactive Publication Date: 2014-01-15
CHINA PETROCHEMICAL CORP
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Problems solved by technology
[0004] In order to solve the above problems, the present invention provides a recovery process of carbon dioxide materials during the start-up process of an ethylene plant, which can overcome the waste and pollution of carbon two materials during the start-up process of the hydrogenation process after sequential separation
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[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0046] Ethylene plant of the present invention, see figure 1 , including the following:
[0047] A section of suction tank 1, compressor 2 and feed cooler 3 connected in sequence through pipelines;
[0048] Liquid separation tank 4, its feed inlet is connected with feed cooler 3 through pipeline, and its liquid phase outlet is connected with demethanizer 5 through pipeline;
[0049] The cold box 6 is connected with the gas phase outlet of the liquid separation tank 4 through a pipeline;
[0050] Demethanizer 5, its feed inlet is connected with separatory tank 4, and the liquid phase outlet is connected with deethanizer 7 through pipeline;
[0051] Deethanizer 7, its feed inlet...
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The invention discloses a process and a device for recovering C2 materials in an ethylene device. In a running process of a device for producing ethylene by hydrogenation after sequential separation, a part of cold source of a feed cooler is gas-phase C2 materials flowing back from a gas-phase outlet of a C2 gas-liquid separation tank; the gas-phase C2 materials in the C2 gas-liquid separation tank are subjected to multistage preheating through the feed cooler and then returned to a segment of a suction tank of a compressor for recycling; and the recycled gas-phase C2 materials not only can ensure the normal flow rate needed for running an acetylene hydrogenation reactor when the ethylene device is running in a low-load condition, but also can provide a part of cold energy for cooling pyrolysis gas. The liquid-phase C2 materials in the C2 gas-liquid separation tank are delivered to an unqualified ethylene product tank for storage, and returned to the ethylene device after the ethylene plant is running normally. The recovering process disclosed by the invention not only can recover the materials and realize no flare gas discharge, but also can fully recover the energy.
Description
technical field [0001] The invention relates to a process and a device for recovering carbon dioxide materials during the start-up of an ethylene plant. Background technique [0002] Ethylene is the basic raw material of petrochemical industry, and the output of ethylene is also an important symbol to measure the level of a country's petrochemical industry. Nowadays, people's daily life is inseparable from products with ethylene derivatives as the main raw materials. By the end of 2010, my country's ethylene production had exceeded 14 million tons, and there were more than 22 ethylene plants. According to the flow classification, the current ethylene units can be roughly divided into three categories: the first type is the hydrogenation process after sequential separation, the second type is the hydrogenation process before depropanization, and the third type is hydrogenation before deethanization Among them, the ethylene plant in my country is mainly based on the hydrogenat...
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IPC IPC(8): C07C11/04C07C5/09C07C4/04C07C7/00C07C7/04
CPCY02P20/50Y02P30/40
Inventor 贾建军宋春波孙凤新张本华郭志雄郭淳张玉鸿
Owner CHINA PETROCHEMICAL CORP