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Separation method and separation device for propane dehydrogenation propylene preparation reaction product

A separation method and technology for dehydrogenation of propane, which are applied in the purification/separation of hydrocarbons, hydrocarbons, adsorption purification/separation, etc., can solve the problems of high energy consumption, large circulating amount of absorbent, and high hydrogen content, and achieve the loss of propylene. Less, avoid the cooling back, improve the effect of the separation effect

Pending Publication Date: 2020-04-14
SINOPEC ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogen content in the propane dehydrogenation product is high, the required absorbent circulation is very large, and the energy consumption is high

Method used

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  • Separation method and separation device for propane dehydrogenation propylene preparation reaction product
  • Separation method and separation device for propane dehydrogenation propylene preparation reaction product
  • Separation method and separation device for propane dehydrogenation propylene preparation reaction product

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Embodiment 1

[0041] Taking the 660,000 tons of propane dehydrogenation to propylene reaction product recovery device as an example, adopt the present invention such as figure 1 For the separation method shown, the results shown in Table 1 below are obtained through process simulation.

[0042] Separation device:

[0043] The feed pipeline of the reaction product of propane dehydrogenation to propylene is connected to the feed compressor 1, the first heat exchanger 2 and the first-stage flash tank 3 in sequence; the tank top of the first-stage flash tank 3 is connected to the second heat exchanger in sequence 4. The PSA feed compressor 5, the third heat exchanger 6 and the PSA device 7 are connected, and the bottom of the tank is connected with the deethanizer 12; the PSA device 7 is respectively provided with a hydrogen production pipeline and a desorption gas production pipeline; desorption The gas production pipeline is connected to the PSA tail gas compressor 8, the fourth heat exchang...

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Abstract

The invention belongs to the field of chemical engineering, and discloses a separation method and a separation device for a propane dehydrogenation propylene preparation reaction product. The separation method comprises the following steps: compressing and cooling of propylene propane dehydrogenation propylene preparation reaction product is carried out, and the propane dehydrogenation propylene preparation reaction product is sent to a first-stage flash tank for gas-liquid separation; a tank top gas phase of the first-stage flash tank is sent to a PSA device after being reheated, pressurizedand cooled; hydrogen and desorbed gas are separated in the PSA device, the desorbed gas is sent to a second-stage flash tank after being pressurized and cooled, a gas phase at the top of the second-stage flash tank is sent to a fuel gas system after being reheated, and a liquid phase at the bottom of the second-stage flash tank is sent to a deethanizer; a tank bottom liquid phase of the first-stage flash tank is sent to the deethanizer, a tower top gas phase of the deethanizer is reheated and then sent to a fuel gas system, a tower bottom liquid phase is sent to a propylene rectifying tower, apropylene product is obtained at the tower top of the propylene rectifying tower, and propane is obtained at the tower bottom. According to the invention, the separation effect of the reaction product is improved, the recovery effect and purity of hydrogen are improved, and the energy consumption of the separation system can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more specifically relates to a method and a device 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 propylene demand, and the consumption is still growing at a rate of about 5-6% 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 (PDH) is undoubtedly the most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C7/12C07C7/04C07C11/06
CPCC07C7/005C07C7/12C07C7/04C07C11/06
Inventor 潘鹏刘洪谦白宇辰赵百仁李广华
Owner SINOPEC ENG
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