Separation method for reaction product of propane dehydrogenated propylene preparation

A technology of propane dehydrogenation and reaction products, applied in distillation purification/separation, organic chemistry and other directions, can solve the problems of high energy consumption and large circulation of absorbent, and achieve the effects of low energy consumption, convenient operation and guaranteed yield

Inactive Publication Date: 2017-01-11
SINOPEC GUANGZHOU ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for separating the reaction product of propane dehydrogenation to propylene, so as to overcome the problems of large absorbent circulation and high energy consumption in the prior art

Method used

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  • Separation method for reaction product of propane dehydrogenated propylene preparation

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Embodiment Construction

[0027] Such as figure 1 As shown, the reaction product 1 of propane dehydrogenation to propylene is compressed to 1.2-2.0 MPa (gauge pressure) through the three-stage compression system 2, cooled to 5-10°C through the compression outlet cooling unit 3, and enters the drying system 4, and the reaction product is The water content in the water drops below 1ppm. Under the action of the propylene refrigeration system 28, it is cooled to -35~-20°C by the first-stage refrigerator 5 and then enters the first-stage cryogenic tank 6 for gas-liquid separation. Under the action of the ethylene refrigeration system 9, it is cooled to -95~-85°C by the second-stage refrigerator 8, and enters the second-stage cryogenic tank 10 for gas-liquid separation. After the tank top gas is exchanged, most of it is returned to the reaction as circulating hydrogen 14 Part, the remaining gas is sent out to the device as propane hydrogen 13. The first-stage cryogenic tank liquid phase 12 and the second-s...

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Abstract

The invention discloses a separation method for a reaction product of propane dehydrogenated propylene preparation and belongs to the field of petrochemical industry. The method comprises the following steps: (1) the reaction product of propane dehydrogenated propylene preparation is pretreated, then, the pretreated reaction product enters a propylene and ethylene cascaded refrigeration system with an expander, and then, a liquid phase is fed to a deethanizer; (2) top oil gas of the deethanizer is condensed and then enters a reflux tank of the deethanizer, tank bottom liquid of the reflux tank of the deethanizer totally returns to the deethanizer, tank top gas of the reflux tank of the deethanizer enters a top condensation section of the deethanizer and is fractionated by the condensation section, and top gas of the condensation section is condensed by a refrigerator of the top condensation section of the deethanizer under the action of a propylene refrigerating system and then enters a deep freezing tank of the deethanizer; (3) tank top gas of the deep freezing tank of the deethanizer is delivered out of a device as fuel gas, and bottom liquid of the deethanizer enters a propylene refiner; and (4) a refined propylene product is fractionated from the top of the propylene refiner, a bottom liquid phase of the propylene refiner enters a depropanizer, and a bottom product C4+ cut of the depropanizer is delivered out of the device. By adopting the separation method, the problems, i.e., large absorbent circulating rate and high energy consumption in the prior art can be solved.

Description

technical field [0001] The invention belongs to the field of petrochemical industry or natural gas chemical industry, and in particular relates to a method for separating reaction products from propane dehydrogenation to propylene. Background technique [0002] Propylene is an important basic organic chemical raw material in the chemical industry. For a long time, the sources of propylene at home and abroad mainly depend on the co-production of naphtha cracking and FCC by-products. According to statistics, the Chinese market accounts for more than 15% of the global demand for propylene, and the consumption is still growing at a rate of about 5% to 6% per year. The gap between supply and demand of propylene has been increasing in recent years. With the shortage of petroleum resources and the price of natural gas being cheaper than that of crude oil, the derived C3 and C4 alkanes have attracted more and more attention, among which propane catalytic dehydrogenation technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C7/04
Inventor 徐又春郭劲鹤孙秋荣罗妍杨旭东董海芳王发辉张钟岩冯好喆田纪伟
Owner SINOPEC GUANGZHOU ENG
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