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Cold box low-temperature separation method for PDH project

A separation method and cold box technology, which are used in cold treatment separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of short catalyst life and large investment, and achieve easy control, strong operability and high recovery rate. Effect

Active Publication Date: 2016-03-30
HANGZHOU HANGYANG
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Problems solved by technology

There are many propane dehydrogenation processes, the most widely used are UOP’s Oleflex process and Lummus’s Catofin process. The former has higher requirements for propane purity, less investment and easy operation, while the latter has lower requirements for propane purity and higher conversion rate, but Large investment, short catalyst life

Method used

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  • Cold box low-temperature separation method for PDH project

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with accompanying drawing: figure 1 As shown, the cold box low-temperature separation method of the PDH project of the present invention includes four plate-fin heat exchangers, seven gas-liquid separators, two expansion units and a cryogenic pump.

[0014] The first plate-fin heat exchanger E1 has a hot flow channel and two cold flow channels, in which the first feed material with a temperature of 35~50°C passes through the hot flow channel of E1 and is cooled to -40~-55°C before entering the first The gas stream separated by the gas-liquid separator V1 and V1 enters the hot flow channel of the second plate-fin heat exchanger E2, wherein the second plate-fin heat exchanger E2 is provided with two hot flow channels and two cold flow channels, the above The gas stream is cooled to -100~-115°C in the first heat flow channel of the second plate-fin heat exchanger E2 and then enters the second gas-liquid...

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Abstract

Provided is a cold box low-temperature separation method for a PDH project. According to the method, four plate-fin heat exchangers, six gas-liquid separators, a flash tank, two expansion units and a low-temperature pump are included; first feed is cooled through the first plate-fin heat exchanger and the second plate-fin heat exchanger and then enters the second gas-liquid separator; gas separated by the second gas-liquid separator enters the expansion end of the first expansion unit to be expanded, and then the second gas-liquid separator is connected with the third gas-liquid separator; gas separated by the third gas-liquid separator is divided into two sections, gas separated by the fourth gas-liquid separator enters the third plate-fin heat exchanger to be subjected to heat exchange with another dry gas product, and gas separated by the sixth gas-liquid separator and circulating gas both enter the second plate-fin heat exchanger. The cold box low-temperature separation method has the advantages of being simple in procedure, high in product recovery rate, easy to operate and good in economic performance, saving energy and the like.

Description

technical field [0001] The invention relates to a cold box low-temperature separation method for a PDH project, which is mainly applicable to a cold box low-temperature separation method for effectively separating feed materials in subdivided low-temperature regions and recovering energy in a PDH project of a catalytic process. Background technique: [0002] Propylene is a key raw material for the manufacture of plastics, polymers and specialty chemicals, and is an important chemical product next to ethylene in the chemical industry. Usually propylene is a by-product in the process of refining refined oil or cracking to produce ethylene. Propane dehydrogenation to propylene (ie Propane Dehydrogenation, English abbreviation PDH) is a process in which propane is dehydrogenated to propylene under the action of a catalyst. Therefore, PDH provides a new technical path, which is to use propane instead of various distillate oils as raw materials to concentrate on the production of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/04C07C11/06
CPCC07C7/00C07C7/04C07C11/06F25J2235/60Y02P20/10
Inventor 韦小雄张宽胡明辉张淑文周寒秋林彬彬孙石桥周冬根应勇江陈海燕崔超岭肖伟俊
Owner HANGZHOU HANGYANG
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