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A separation device and separation method for generating gas from propane dehydrogenation to propylene reaction

A technology of propane dehydrogenation and separation device, applied in the chemical industry, can solve the problems of difficult compression, large refrigerant energy consumption, etc.

Active Publication Date: 2022-06-21
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the gas generated by the propane dehydrogenation reaction contains a large amount of hydrogen, the use of low-temperature expansion refrigeration is actually the reaction product gas compressor to compress the hydrogen expansion refrigeration. Due to the small molecular weight of hydrogen, it is difficult to compress, so it is used as -100 ℃ to -160 ℃ Refrigerant consumes a lot of energy

Method used

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  • A separation device and separation method for generating gas from propane dehydrogenation to propylene reaction
  • A separation device and separation method for generating gas from propane dehydrogenation to propylene reaction
  • A separation device and separation method for generating gas from propane dehydrogenation to propylene reaction

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Embodiment 1

[0045] using as figure 2 The separation device for the gas produced from the reaction of propane dehydrogenation to propylene, the separation device includes: a mixed refrigerant compressor 1, a propylene refrigeration system 3, a light and heavy refrigerant liquid separation tank D1, a primary cold box 6, and a secondary cold box 7 , three-stage cold box 8, first liquid separation tank D2, third liquid separation tank D3, pre-demethanizer T1, demethanizer T2; mixed refrigerant compressor 1 and propylene refrigeration system 3, light and heavy refrigerant liquid separation in turn The tank D1 is connected; the light and heavy refrigerant separation tank D1 is provided with a light refrigerant pipeline on the top of the tank, and a heavy refrigerant pipeline on the bottom of the tank. The tank 8 is connected, and then reversely connected to the tertiary cold box 8, the secondary cold box 7, the primary cold box 6 and the mixed refrigerant compressor 1; after the heavy refriger...

Embodiment 2

[0052] using as image 3 The separation device for the gas produced by the reaction of propane dehydrogenation to propylene, the separation device includes: a mixed refrigerant compressor 1, a propylene refrigeration system 3, a light and heavy refrigerant liquid separation tank D1, a primary cold box 6, and a secondary cold box 7 , the three-stage cold box 8, the first liquid separation tank D2, the second liquid separation tank D3 and the third liquid separation tank D4; the mixed refrigerant compressor 1 is connected with the propylene refrigeration system 1 and the light and heavy refrigerant liquid separation tank D1 in turn; The light and heavy refrigerant separation tank D1 is provided with a light refrigerant pipeline on the top of the tank, and a heavy refrigerant pipeline on the bottom of the tank. Then connect with the third-stage cold box 8, the second-stage cold box 7, the first-stage cold box 6 and the mixed refrigerant compressor 1 in reverse order; the heavy ref...

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Abstract

The invention belongs to the field of chemical industry, and discloses a separation device and separation method for gas generated by the reaction of propane dehydrogenation to propylene. The separation device includes: a mixed refrigerant compressor, a propylene refrigeration system, a liquid separation tank for light and heavy refrigerants, and at least one The cold box sequence of the cold box; the mixed refrigerant compressor, the propylene refrigeration system, the light and heavy refrigerant liquid separation tank, and the cold box sequence are connected in sequence to form a closed loop. In the technical solution provided by the present invention, the reaction-generated gas itself does not need throttling and expansion refrigeration, only by adjusting the reasonable refrigerant ratio and operating parameters to exchange heat between the reaction-generated gas and the mixed refrigerant, and finally achieve -160°C To the temperature level of ‑40 °C, the purpose of fully recovering propylene products can be achieved while reducing equipment investment.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more particularly relates to a separation device and a separation method for gas produced by the reaction of producing propylene by dehydrogenation of propane. Background technique [0002] Propylene is an important petrochemical basic raw material second only to ethylene in total output. The downstream products mainly include polypropylene, acrylonitrile, propylene oxide, cumene / phenol / acetone / bisphenol A, acrylic acid and ester, epichlorohydrin . About 70% of the world's propylene comes from steam cracker co-products and refinery catalytic cracker by-products. With the rapid growth of demand for downstream products such as polypropylene, and the increase in the proportion of new ethylene production units using ethane as raw material, the supply of propylene resources is gradually showing a tense situation. In 2014, the global production capacity including polymer-grade propylene was 110.6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02
CPCF25J3/0242F25J3/0252F25J3/0295F25J2270/66F25J3/0219F25J2200/74F25J2270/60F25J2270/12F25J2270/18F25J2210/12F25J2205/02F25J3/062F25J3/0645F25J3/0655F25J2215/64F25J2270/04
Inventor 孙丽丽彭勃李广华
Owner SINOPEC ENG