Catalytic adsorption-desorption isomerization method

A technology of isomerization and reaction, applied in the field of reversible isomerization reaction, which can solve the problem that the conversion rate of specific components cannot be improved.

Active Publication Date: 2017-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

for type of isomerization reaction, it is impossible to use the

Method used

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  • Catalytic adsorption-desorption isomerization method

Examples

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preparation example Construction

[0028]The preparation of the catalyst can be carried out according to the conventional method. The hydrogen type zeolite is mixed with the binder and then molded. The molding is preferably extruded, then dried and calcined. The firing temperature is 400-600°C. To support platinum group metals, impregnate the catalyst containing molecular sieves with a solution containing platinum group metal compounds, preferably chloroplatinic acid, dry and calcinate to obtain a catalyst containing platinum group metals.

[0029] In a preferred solution of the present invention, the catalyst is mixed with an adsorbent, or the two are placed in layers at intervals. The mass ratio of the catalyst to the adsorbent is preferably 1:1-30, more preferably 1:4-20.

[0030] The adsorbent is sodium ZSM-5 or Silicalite-1 zeolite. The silica / alumina molar ratio of the sodium ZSM-5 zeolite is preferably 300-700.

[0031] The adsorbent preferably contains a binder, and the binder is preferably kaolinite...

example 1

[0040] Take the hydrogen-type ZSM-5 zeolite with a silica / alumina molar ratio of 25, use alumina as a binder, extrude into strips with an outer diameter of 1 mm, cut into particles with a length of 2 to 3 mm, and roast at 500 ° C to prepare the catalyst A, wherein the HZSM-5 zeolite content is 70% by mass.

[0041] A cylindrical reactor with an inner diameter of 30mm and a height of 120mm was filled with 50g of catalyst A, replaced with nitrogen and then heated to 210°C. Using m-xylene (MX) with a purity greater than 99% by mass as the raw material, it enters the reactor through preheating and vaporization. The mass flow rate of the feed is 2.5g / min, and the feed time is 41s. In the state of feeding and not discharging for 69s, open the outlet of the reactor, release and collect the reaction product, reduce the pressure of the reactor to 0.1MPa, and discharge the material for 10s. Then re-feed m-xylene into the reactor at a flow rate of 2.5 g / min, repeat the above steps and c...

example 2

[0043] Take NaZSM-5 zeolite with a silica / alumina molar ratio of 600, use kaolin as a binder, and roll into balls to obtain small balls with a particle size of 0.6-1.0 mm. After roasting at 500 ° C, the adsorbent B is prepared. Among them, the content of NaZSM-5 zeolite is 92% by mass.

[0044] Get 45g adsorbent B and 5g catalyst A and mix homogeneously, fill in the used reactor of example 1. After replacing with nitrogen, the temperature was raised to 220°C. Using m-xylene (MX) with a purity greater than 99% by mass as the raw material, it enters the reactor through preheating vaporization, the feed mass flow rate is 5g / min, and the feed time is 39s. In the state of 71s that the material is not discharged, the outlet of the reactor is opened, the reaction product is discharged and collected, the pressure of the reactor is reduced to 0.1MPa, and the discharge time is 10s. Then feed the reaction raw materials into the reactor again at a flow rate of 5 g / min, repeat the above ...

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Abstract

The invention discloses a catalytic adsorption-desorption isomerization method. According to the catalytic adsorption-desorption isomerization method, reaction raw materials are delivered into a catalyst bed, and isomerization reaction conditions are achieved; reaction is carried out without discharging materials; pressure is reduced for desorption; and a reaction product is discharged from the catalyst bed; wherein the ratio of the reaction time to the desorption time is controlled to be larger than 10. Gas phase reaction process and pressure swing adsorption process are combined so as to increase reaction conversion rate, and obtain the target product with a concentration higher than a chemical equilibrium value.

Description

technical field [0001] The invention relates to a gas-phase reversible isomerization method of hydrocarbons, specifically, a reversible isomerization reaction method combining a reaction process and a pressure swing adsorption process. Background technique [0002] In chemical production, people convert raw materials into desired target products through chemical reaction process. When the reaction raw material is not completely converted into the product, it usually needs to be separated from the product and recycled for further reaction. The lower the conversion rate of the reaction, the greater the amount of material that needs to be separated, and the higher the energy consumption of the entire production process. In order to improve the utilization rate of raw materials or reduce the energy consumption of recycling raw materials, it is hoped to increase the conversion rate of raw materials as much as possible in production. Many reaction processes used in production ar...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C15/08
CPCY02P20/52
Inventor 王德华郁灼王辉国马剑锋杨彦强
Owner CHINA PETROLEUM & CHEM CORP
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