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Method for producing propylene oxide

A propylene oxide and propylene technology, applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., can solve the problems of poor heat transfer effect, flying temperature of catalyst layer, shortened service life of catalyst, etc., to prevent overheating damage , The effect of reducing flying temperature and fast heat transfer rate

Active Publication Date: 2013-12-18
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the prior art, the heat transfer effect of the fixed bed tubular reactor or the circular arc / elliptical arc corrugated plate structure reactor is poor, and the phenomenon of "flying temperature" is prone to occur locally in the catalyst layer. Issues leading to shortened catalyst life, providing a new method for the production of propylene oxide

Method used

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  • Method for producing propylene oxide
  • Method for producing propylene oxide

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Embodiment 1

[0027] The production scale of HPPO is 100,000 tons / year, using titanium silicon molecular sieve catalyst, TiO 2 : SiO 2 It is 1:7. In the plate-type catalytic reactor, the molar ratio of propylene, hydrogen peroxide, additives, and methanol is 2:1:2:10 and flows through the plates filled with catalyst for sufficient reaction. The auxiliary agent is lithium chloride. A plurality of heat transfer plates are arranged side by side at fixed intervals inside the reactor, and the concave and convex surfaces of the corrugated plates of two adjacent heat transfer plates are arranged opposite to each other to form a group of heat transfer plates. The inner space formed by this group of heat transfer plates As a catalyst filling space, the gap channel formed between this group of heat transfer plates and another adjacent group of heat transfer plates serves as a heat transfer medium circulation space, and the adjacent two groups of heat transfer plates are arranged alternately. The c...

Embodiment 2

[0030] According to the method of embodiment 1, the HPPO production scale is 200,000 tons / year, adopts titanium silicon molecular sieve catalyst, TiO 2 : SiO 2 The ratio is 1:10, and the additive is sodium nitrate. The molar ratio of propylene, hydrogen peroxide, additives, and methanol is 2:1:2:10, the reaction pressure of the plate catalytic reactor is 1.1MPa in gauge pressure, the reaction temperature of the catalytic reactor is 55°C, and the total heat transfer of the reaction Factor K from the original 300 w / m 2 k increased to 1200 w / m 2 k, the average service life of the catalyst was extended to 3.9 years.

[0031]

Embodiment 3

[0033] According to the method for embodiment 2, the TiO of titanium silicon molecular sieve catalyst 2 : SiO 2 The ratio is 1:20, and the auxiliary agent is potassium sulfate. The molar ratio of propylene, hydrogen peroxide, additives, and methanol is 2:1:2:10, the reaction pressure of the plate catalytic reactor is 3.0MPa in gauge pressure, the reaction temperature of the catalytic reactor is 80°C, and the total heat transfer of the reaction Factor K from the original 400 w / m 2 k increased to 1500 w / m 2 k, the average service life of the catalyst was extended to 4.0 years.

[0034]

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Abstract

The invention relates to a method for producing propylene oxide which is mainly used for solving the problems of poor heat transfer effect, easiness in causing a temperature runaway phenomenon at the local part of a catalyst layer and effect of shortening the service life of a catalyst of a reactor in the prior art. The technical scheme adopted by the invention is as follows: according to the method for producing the propylene oxide, disclosed by the invention, a plate type catalytic reactor is used, a plurality of heat transfer plates are arranged in the reactor at fixed intervals side by side, the concave surfaces and convex surfaces of wavy plates of the two adjacent heat transfer plates are oppositely arranged to form a group of heat transfer plates, the internal space of the group of the heat transfer plates is used as a catalyst filling space, a gap channel formed between the group of the heat transfer plates and the other adjacent group of the heat transfer plates is taken as a heat transfer medium circulation space, the two adjacent groups of the heat transfer plates are arranged in a staggered manner, the structure of the convex surface of each heat transfer plate is polygonal, and the number of edges is 2-8, so that the problems can be better solved. The method can be used in the production of the propylene oxide.

Description

[0001] technical field [0002] The present invention relates to a method for producing propylene oxide. technical background [0003] The chemical industry is a knowledge- and capital-intensive industry. With the development of science and technology, it has gradually developed into a multi-industry and multi-variety production department, and a large number of chemical companies that comprehensively utilize resources and scale up have emerged; the chemical industry is also one of the important pillar industries in the national economy. Chemical reactors are the core part of chemical plants. At present, more than 95% of chemical reactions are completed through catalytic reactors. For example, the process of producing propylene oxide by hydrogen peroxide method (HPPO method for short) is an energy-saving and environmentally friendly process technology that has just entered industrial application in the world in recent years; the synthesis reaction of hydrogen peroxide and p...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12B01J8/02
Inventor 杨建平叶志一白玫何琨
Owner SINOPEC SHANGHAI ENG
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