Moving bed C3/C4 alkane dehydrogenation process

A technology of alkane dehydrogenation and moving bed, which is applied in the field of C3/C4 alkane dehydrogenation to olefins in the petrochemical industry. It can solve the problems of shortening catalyst life, aggravating catalyst carbon deposition, improving the third-stage reactor, etc., and reducing energy consumption. , high conversion rate and selectivity, and the effect of lowering the reaction temperature

Active Publication Date: 2019-11-15
淄博链科工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The advantage of this way of conveying the reactant stream and the catalyst stream is that the pressure is easy to transport from high to low, and the disadvantage is that the reactor with a high-activity catalyst is the material that is easy to react, while the reactor with a low-activity catalyst is carried out. It is a material that is difficult to react. The active state of the catalyst in the reactor does not match the difficulty of the reaction. This arrangement will increase the feed temperature of the third-stage reactor, aggravate the carbon deposition of the catalyst and shorten the life of the catalyst.

Method used

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  • Moving bed C3/C4 alkane dehydrogenation process
  • Moving bed C3/C4 alkane dehydrogenation process
  • Moving bed C3/C4 alkane dehydrogenation process

Examples

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Embodiment 1

[0073] This example uses the raw materials in Table 1 and the catalysts in Table 2, taking 300,000 tons / year of propane dehydrogenation as an example, using a countercurrent moving bed C3 / C4 alkane dehydrogenation process, including a 3-stage reaction system, and catalyst regeneration system, catalyst circulation system, dust separation system, hydrogen permeable membrane separator. The fresh reactant stream flows from the first-stage reactor to the third-stage reactor in sequence, and the catalyst stream flows from the third-stage reactor to the first-stage reactor in sequence, and the moving direction of the catalyst stream in each reactor is related to the reaction The material flow is opposite and countercurrent, that is, the regenerated catalyst enters from the third-stage reactor and flows out from the first-stage reactor into the regenerator. The fresh reactant stream enters the first-stage reactor, and the partial pressure of the product gas is zero, and the reaction i...

Embodiment 2

[0075] This example uses the raw materials in Table 1 and the catalysts in Table 2, taking 300,000 tons / year of propane dehydrogenation as an example, using a countercurrent moving bed C3 / C4 alkane dehydrogenation process, including a 3-stage reaction system, and catalyst regeneration system, catalyst circulation system, dust separation system, hydrogen permeable membrane separator. The fresh reactant stream flows from the first-stage reactor to the third-stage reactor in sequence, and the catalyst stream flows from the third-stage reactor to the first-stage reactor in sequence, and the moving direction of the catalyst stream in each reactor is related to the reaction The material flow is opposite and countercurrent, that is, the regenerated catalyst enters from the third-stage reactor and flows out from the first-stage reactor into the regenerator. The fresh reactant stream enters the first-stage reactor, and the partial pressure of the product gas is zero, and the reaction i...

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Abstract

The invention discloses a moving bed C3/C4 alkane dehydrogenation process. A catalyst has a flowing direction (among reactors)opposite to that of a reactant flow. The method comprises the following steps: feeding a mixed hydrogen and C3/C4 alkane fed material flow through a heat integration heat exchanger and a heating furnace, feeding the flow into a first-stage reactor, and feeding the flow through a second-stage reactor and a final-stage reactor in series in sequence to form a reaction material flow; and regenerating the catalyst by using a regenerator, feeding the catalyst into the final-stage reactor, and feeding the catalyst through the second-stage reactor and the final-stage reactor in series in sequence to form a catalyst flow, wherein a hydrogen permeable membrane separator is arranged at the outlet of each stage of the reactors. Compared with a conventional industrial propane dehydrogenation process, the process is capable of increasing the per-pass conversion rate of C3/C4alkane, reducing reaction temperatures, improving selectivity, saving energy, reducing carbon accumulation on the catalyst, prolonging the service life of the catalyst and reducing investment of devices.

Description

technical field [0001] The invention relates to the field of C3 / C4 alkane dehydrogenation to olefins in petrochemical industry, and furthermore, relates to a countercurrent moving bed C3 / C4 alkane dehydrogenation process. Background technique [0002] Propylene is an important organic chemical raw material and an important petrochemical basic raw material second only to ethylene. It is widely used in the production of polypropylene, acrylonitrile, isopropanol, phenol and acetone, butanol and octanol, acrylic acid and its lipids And the system of propylene oxide and propylene glycol, epichlorohydrin and synthetic glycerol, etc. At present, petroleum-based propylene and coal-based propylene account for a relatively large proportion of propylene production. Propylene produced from oil-based olefins accounts for about 66% of propylene production, while coal-based olefins accounts for about 20%. Compared with the previous two processes, propane The propylene output of the dehydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C5/333C07C7/00C07C7/144C07C7/04C07C11/06C07C11/08B01J8/00B01J8/38B01J8/26B01D71/02B01D53/22
CPCC07C5/3337C07C7/005C07C7/144C07C7/04B01J8/006B01J8/384B01J8/26B01D71/02B01D53/228B01D2053/221B01J2208/00539C07C11/06C07C11/08Y02P20/584Y02P20/52Y02P20/10
Inventor 王云峰其他发明人请求不公开姓名
Owner 淄博链科工程材料有限公司
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