Reactor process control method of HPPO (hydrogen peroxide to propylene oxide) device

A process control and reactor technology, applied in the production of bulk chemicals, organic chemistry, etc., can solve the problems of poor heat transfer effect, uneven reaction temperature, difficult to control the temperature in the reactor, etc., to achieve good technical effect, selectivity improved effect

Active Publication Date: 2017-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of poor heat transfer effect, uneven reaction temperature, and difficult control of the temperature in the reactor in the prior art, and a new process control method for the reactor of the HPPO device is provided

Method used

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  • Reactor process control method of HPPO (hydrogen peroxide to propylene oxide) device
  • Reactor process control method of HPPO (hydrogen peroxide to propylene oxide) device

Examples

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Embodiment 1

[0020] Such as figure 1 As shown, when process materials and circulating cooling water flow together, methanol solvent (5), propylene raw material (6) and hydrogen peroxide raw material (7) enter in the corrugated plate group of catalytic reactor (1), under the action of catalyst, Perform an initial reaction. The reacted process material (8) enters the corrugated plate group of the catalytic reactor (2) together with the propylene raw material (6) and the hydrogen peroxide raw material (7), and carries out the initial reaction under the action of the catalyst. The reacted process material (9) enters the catalytic reactor (3) outside the corrugated plate group, and undergoes post-stage reaction under the action of the catalyst. The reacted process material (10) enters the catalytic reactor (4) outside the corrugated plate group, and then undergoes a later stage reaction under the action of the catalyst. The reacted propylene oxide product (11) is sent to the subsequent sectio...

Embodiment 2

[0026] According to the conditions and steps of Example 1, the production scale is changed to 100,000 tons / year of HPPO industrial production equipment, and the circulating cooling water of the present invention is adopted to be forced to circulate to optimize heat removal and to control the temperature of the circulating cooling water by a thermometer and a regulating valve to evenly Propylene oxide is produced by controlling the reaction temperature. The process parameters of the epoxidation reaction are as follows: the temperatures of the four reactors are respectively 78°C, 65°C, 58°C, and 50°C, the reaction pressure is 2.8MPaG, and the propylene weight space velocity is 3.2 h -1 , the methanol / hydrogen peroxide molar ratio is 8:1, the propylene / hydrogen peroxide molar ratio is 1.4:1, and the TS-1 titanium-silicon molecular sieve catalyst is used, and the titanium-silicon ratio is SiO 2 : TiO 2 =165, the ratio of the flow rate of circulating cooling water for forced circu...

Embodiment 3

[0029] According to the conditions and steps of Example 1, the production scale is changed to 200,000 tons / year HPPO industrial production device, and the circulating cooling water of the present invention is adopted to be forced to circulate to optimize heat removal and to control the temperature of the circulating cooling water by a thermometer and a regulating valve to be uniform. The method of controlling the reaction temperature produces propylene oxide. The process parameters of the epoxidation reaction are as follows: the temperatures of the four reactors are respectively 79°C, 70°C, 59°C, and 50°C, the reaction pressure is 3.2MPaG, and the propylene weight space velocity is 4.6 h -1 , the methanol / hydrogen peroxide molar ratio is 12:1, the propylene / hydrogen peroxide molar ratio is 3.2:1, and the TS-1 titanium-silicon molecular sieve catalyst is used, and the titanium-silicon ratio is SiO 2 : TiO 2 =130, the ratio of the flow rate of circulating cooling water for forc...

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Abstract

The invention relates to a reactor process control method of an HPPO (hydrogen peroxide to propylene oxide) device and mainly solves the problems that a heat transfer effect is poor, the reaction temperature is not uniform and the temperature in a reactor is difficult to control in the prior art. By means of the reactor process control method of the HPPO device, four serially connected corrugated plate reactors are adopted, circular cooling water is forced to circulate to optimize heat removing, and the temperature of the circular cooling water is controlled through a thermometer and an adjusting valve, so that the reaction temperature is uniform. Accordingly, by means of the technical scheme that the total heat transfer coefficient K is increased to 2,400-2,800 w / m<2>k, the service life of a catalyst is prolonged to 4.8-5.0 years and the selectivity of epoxypropane is improved to 97.2%-97.3%, the problems are better solved, and the reactor process control method can be used in the HPPO device.

Description

technical field [0001] The invention relates to a process control method of an HPPO device reactor. Background technique [0002] Propylene oxide is a very important organic chemical raw material, which can be used in the production of polyols, polyurethanes, non-ionic surfactants, oil field demulsifiers, pesticide emulsifiers, etc. It is widely used in automobiles, construction, food, tobacco, medicine and cosmetics and other industries. The invention patent CN 201310683291.4 in the prior art is a method for preparing propylene oxide, which discloses that each reactor in which the reaction raw material enters the reactor of the process device contacts with a catalyst to react to generate propylene oxide. The product stream from each reactor can optionally be passed to a subsequent separation section and / or to at least one of the remaining reactors. When the catalyst in the reactor of the process unit is deactivated, the reactor can be isolated for catalyst regeneration op...

Claims

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Application Information

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IPC IPC(8): C07D301/12C07D303/04
CPCC07D301/12C07D303/04Y02P20/52
Inventor 吴德荣张斌孙丽丽叶志一白玫杨建平何琨
Owner CHINA PETROLEUM & CHEM CORP
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