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FTrPSA hydrogen extraction method for recycle hydrogen during propane dehydrogenation to propylene

A technology of propane dehydrogenation and circulating hydrogen, applied in chemical instruments and methods, hydrogen separation, hydrocarbons, etc., can solve the problems of high energy consumption, high investment and operating costs, and achieve low equipment investment costs and economic benefits. Effect

Active Publication Date: 2019-04-19
SICHUAN TECHAIRS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the problems of high investment and operating costs caused by high energy consumption, anti-corrosion, and different specifications of circulating hydrogen and product hydrogen in the product separation section in the production process of PDH and hydrocarbon mixed gas dehydrogenation to olefins. Provided is a FTrPSA hydrogen extraction method for circulating hydrogen from propane dehydrogenation to propylene, specifically a full temperature-range pressure swing adsorption (FTrPSA) purification method for circulating hydrogen and product hydrogen in the production process of propane dehydrogenation to propylene (PDH), To solve the above-mentioned problems existing in the prior art

Method used

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  • FTrPSA hydrogen extraction method for recycle hydrogen during propane dehydrogenation to propylene
  • FTrPSA hydrogen extraction method for recycle hydrogen during propane dehydrogenation to propylene
  • FTrPSA hydrogen extraction method for recycle hydrogen during propane dehydrogenation to propylene

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Embodiment 1

[0039] Such as figure 1 Shown, a kind of FTrPSA hydrogen extraction method of propane dehydrogenation propylene circulation hydrogen, concrete implementation steps comprise,

[0040] (1) Pretreatment process, the reactant mixed gas from the propane dehydrogenation to propylene (PDH) reaction zone, as the raw material gas, its main component is propylene of 35% to 40% (volume ratio, the following is similar), 40 ~55% hydrogen, and the remaining components include methane, ethane, propane, isobutene, isobutane, n-butane, propyne, dienes and other C2+ hydrocarbon components, as well as solid particles, green oil, C6 ( C6+) and other impurity components such as water components, after a pretreatment process consisting of heat exchange, compression, dust removal, chlorine removal, oil removal, drying and refrigeration, other impurity components in the raw material gas are removed, and then enter the next process , Intercooler separation.

[0041] (2) In the intercooling separatio...

Embodiment 2

[0044] Such as figure 1 As shown, on the basis of Example 1, the feed gas contains 0.1 to 1.0% carbon dioxide (CO 2 ), the pretreatment process adds an alkali washing tower between the dust removal, chlorine removal, and oil removal sections and the drying section, and uses potassium hydroxide (KOH) lye containing 4 to 10% as a decarbonization absorbent to remove CO in the raw gas 2 Perform chemical absorption to remove CO 2 , and correspondingly increase the load of the subsequent drying tower.

Embodiment 3

[0046] Such as figure 1 As shown, on the basis of Example 1, the hydrogen-rich gas flowing out from the intercooling separation process is heat-exchanged to a shallow cooling temperature of 5-20°C, and enters the PSA hydrogen extraction process for hydrogen extraction. Vacuum step, and then flushing, pressure equalization boost and product hydrogen final filling, etc. A hydrogen product with a purity greater than or equal to 99.99% flows out from the top of the adsorption tower of the PSA system, and the yield of the hydrogen product is greater than or equal to 83-85%, wherein the total content of olefin impurity components is less than or equal to 0-5ppm.

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Abstract

The invention relates to an FTrPSA hydrogen extraction method for recycle hydrogen during propane dehydrogenation to propylene. The method mainly includes processes of pretreatment, intercooling separation and pressure swing adsorption (PSA) hydrogen extraction; According to a hydrogen product with the purity >= 99.99% and the total content of olefin impurity components <= 0.05% and flowing from an adsorption tower in the PSA hydrogen extraction process, one part of the hydrogen product is taken as recycle hydrogen to mix with propane feed gas and return back to a PDH reaction area to performreaction, and the other part of the hydrogen product is taken as the hydrogen product to output or / and be used for selective hydrogenation of propylene alkyne (SHP) in a PDH fractionation area; and the desorbed gas flowing from the bottom of the adsorption tower in the PSA hydrogen extraction step can be directly taken as fuel gas or hydrogen production feed gas to output, and the propane whose reaction is not finished can return to mix with the propane feed gas and enters to the PDH reaction area to perform reaction. Thus, problems, that energy consumption in a product separation section during traditional PDH production is high, investment and operation costs caused by different specifications of required anti-corrosion equipment, the recycle hydrogen and the product hydrogen and difficult ratio control are excessively high, and technology operation has potential safety hazards, can be solved.

Description

technical field [0001] The invention relates to the technical field of preparation and separation of propylene and hydrogen in petrochemical industry and the technical field of energy saving and consumption reduction, in particular to an FTrPSA hydrogen extraction method for propane dehydrogenation to produce propylene circulating hydrogen. Background technique [0002] Propylene is an important petrochemical basic raw material second only to ethylene. In the long run, the global market will continue to be extremely tight in supply for a long time. However, in recent years, breakthroughs have been made in the development of unconventional natural resources in the world, such as shale gas, petroleum-associated gas, and marine combustible ice, especially the successful commercial development of a large number of shale gas resources, making long-term, stable, relatively Inexpensive propane resources have become possible, and furthermore, the project of producing propylene (PDH)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/56C07C7/00C07C7/04C07C7/163C07C11/06
CPCC01B3/56C01B2203/042C01B2203/048C07C7/005C07C7/04C07C7/163C07C11/06
Inventor 钟雨明陈运汪兰海刘开莉蔡跃明
Owner SICHUAN TECHAIRS
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