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A kind of method of loading catalysts with different particle sizes to synthesize propylene oxide

A technology of propylene oxide and catalyst, which is applied in the field of synthesizing propylene oxide by filling catalysts with different particle sizes, can solve the problems of low effective utilization rate of hydrogen peroxide, complex reactor structure, uneven bed temperature, etc., and achieves increased equipment investment and reaction The effect of slow rate and low decomposition rate

Active Publication Date: 2020-11-06
JIANGSU YANGNONG CHEM GROUP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of complex reactor structure, uneven bed temperature, rising bed temperature, low effective utilization rate of hydrogen peroxide, low yield of propylene oxide and risk of explosion in the prior art for propylene oxide synthesis. solution to the problem

Method used

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  • A kind of method of loading catalysts with different particle sizes to synthesize propylene oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Pack ten kinds of titanium-silicon molecular sieves with different particle sizes along the flow direction of the reaction material according to the particle size arrangement in the table below:

[0038] layers Catalyst particle size d / mm Filling height / mm d n / d n+1

[0039] Control the molar ratio of hydrogen peroxide: propylene: methanol to be 1:5:20, and the space velocity of the total liquid weight is 20h -1 Pump into the tubular fixed-bed reactor, the circulating water inlet temperature is 45°C, and the reaction pressure is 4.0MPa. The highest point temperature of the catalyst bed was 54°C, the lowest point temperature was 46°C, and the bed temperature rose by 8°C as detected by a thermocouple. The analysis results showed that the conversion rate of hydrogen peroxide was 99.5%, and the yield of propylene oxide was 92.7%.

Embodiment 2

[0041] Two kinds of titanium-silicon molecular sieves with different particle sizes are packed in the following table along the flow direction of the reactant material:

[0042] layers Catalyst particle size d / mm Filling height / mm d n / d n+1

[0043] Control the molar ratio of hydrogen peroxide: propylene: methanol to be 1:1:5, and the space velocity of the total liquid weight is 5h -1 Pump into the tubular fixed-bed reactor, the circulating water inlet temperature is 50°C, and the reaction pressure is 1.0MPa. The highest point temperature of the catalyst bed was 65°C and the lowest point temperature was 55°C as detected by a thermocouple, and the temperature rise of the bed was 10°C. The analysis results showed that the conversion rate of hydrogen peroxide was 98.5%, and the yield of propylene oxide was 91.5%.

Embodiment 3

[0045] Four kinds of titanium-silicon molecular sieves with different particle sizes are packed in the following table along the flow direction of the reactant material:

[0046] layers Catalyst particle size d / mm Filling height / mm d n / d n+1

[0047] Control the molar ratio of hydrogen peroxide: propylene: methanol to be 1:3:15, and the space velocity of the total liquid weight is 10h -1 Pump into the tubular fixed-bed reactor, the temperature of the circulating water is 40°C, and the reaction pressure is 2.5MPa. The highest point temperature of the catalyst bed was 48°C, the lowest point temperature was 41°C, and the bed temperature rose by 7°C as detected by a thermocouple. The analysis results showed that the conversion rate of hydrogen peroxide was 99.6%, and the yield of propylene oxide was 94.2%.

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Abstract

The invention relates to a method for synthesizing epoxy propane by loading catalysts different in grain size. According to the method, reaction materials sequentially pass through catalyst bed layerscontaining catalysts the grain sizes of which are gradually decreased. Compared with the prior art, the method has the advantages that heat release is uniform and an overtemperature situation is unlikely to occur. The defects that catalysts with large grain size are low in mass transfer speed and reaction rate and the reaction of catalysts on the next layer immediately happens when hydrogen peroxide is not completely converted are avoided. The service life of the catalysts is effectively prolonged, the regeneration frequency is lowered, the production efficiency is improved, the propylene oxide yield is high, the hydrogen peroxide decomposition rate is low, the explosion risk is lowered, and the safety is high.

Description

technical field [0001] The invention relates to a method for synthesizing propylene oxide by loading catalysts with different particle sizes. Background technique [0002] Propylene oxide is an important propylene derivative, which is mainly used in the production of polyether polyols, and then its derivatives, which are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. At present, the main methods for industrially preparing propylene oxide are: chlorohydrin method, co-oxidation method, hydrogen peroxide direct oxidation method (HPPO method). [0003] The chlorohydrin method pollutes the environment greatly and has been eliminated by many European and American countries. The co-oxidation method has long process, large investment and high equipment cost. [0004] The epoxidation reaction of hydrogen peroxide and propylene under the action of a catalyst is the core process in the production process of propylene oxide, and a t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/12
CPCY02P20/52Y02P20/584
Inventor 王根林丁克鸿徐林马春辉王铖刘相李殷恒志
Owner JIANGSU YANGNONG CHEM GROUP
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