Method for continuous preparation of epoxypropane

A technology of propylene and hydrogen peroxide, applied in the production of bulk chemicals, organic chemistry, etc., can solve the problems of serious environmental pollution, poor economy, catalyst deactivation, etc., and achieve the effects of reducing side reactions, small equipment investment, and high selectivity

Active Publication Date: 2008-12-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrial production of propylene oxide mainly adopts the chlorohydrin method and the co-oxygen method. The disadvantage of the chlorohydrin method is that a large amount of waste water is generated, which seriously pollutes the environment; while the co-oxygen method has a large investment and co-production of other low-cost The question of value-added products
[0005] Titanium-silicon molecular sieves must be formed when they are used in fixed-bed reactors. The binders added during the forming process have a certa

Method used

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  • Method for continuous preparation of epoxypropane
  • Method for continuous preparation of epoxypropane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 50g of HTS molecular sieve and place it in the methanol solution of hydrogen peroxide, stir to form a slurry, and then inject it into the reaction system through the catalyst feeding port. Open the feed valve of the liquid-phase raw material (methanol solution of hydrogen peroxide) and backpressure until the system pressure is 2.0 MPa, then open the feed valve of propylene and control the reaction temperature to 40°C. In the reaction system, the molar ratio of methanol to hydrogen peroxide in the liquid phase raw material is 40:1, the molar ratio of propylene to hydrogen peroxide is 2:1, and the space time is 1.5h.

[0030] The results of regular sampling analysis are: the conversion rate of hydrogen peroxide is greater than 98%, the selectivity of propylene oxide is 93%, the selectivity of 1-methoxyl-2-propanol is 2.3%, the selectivity of 2-methoxyl-1-propanol The selectivity to alcohol was 3.2%, and the selectivity to propylene glycol was 1.5%.

Embodiment 2

[0032] Weigh 40g of HTS titanium-silicon molecular sieve and place it in the methanol solution of hydrogen peroxide, stir to form a slurry, and then inject it into the reaction system through the catalyst feeding port. Open the feed valve of the liquid-phase raw material, when the back pressure reaches a system pressure of 2.0 MPa, open the propylene feed valve after the system pressure is stable, and control the reaction temperature at 35°C. The molar ratio of methanol and hydrogen peroxide in the liquid phase raw material is 40:1, the molar ratio of propylene and hydrogen peroxide is 2:1, and the reaction space time is 2.0h.

[0033] The results of regular sampling analysis are: the conversion rate of hydrogen peroxide is greater than 98%, the selectivity of propylene oxide is 95%, the selectivity of 1-methoxyl-2-propanol is 1.7%, the selectivity of 2-methoxyl-1-propanol The selectivity to alcohol was 2.3%, and the selectivity to propylene glycol was 1.0%.

Embodiment 3

[0035]Weigh 50g of HTS titanium-silicon molecular sieve and place it in the methanol solution of hydrogen peroxide, stir to form a slurry, and then inject it into the reaction system through the catalyst feeding port. Open the feed valve of the liquid-phase raw material, when the back pressure reaches a system pressure of 2.0 MPa, open the propylene feed valve after the system pressure is stable, and control the reaction temperature at 35°C. The molar ratio of methanol to hydrogen peroxide in the liquid phase raw material is 40:1, the molar ratio of propylene to hydrogen peroxide is 2:1, and the reaction space time is 3.0h.

[0036] The results of regular sampling analysis are: the conversion rate of hydrogen peroxide is greater than 98%, the selectivity of propylene oxide is 91%, the selectivity of 1-methoxyl-2-propanol is 2.0%, the selectivity of 2-methoxyl-1-propanol Alcohol selectivity was 5.5%, propylene glycol selectivity was 1.5%.

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Abstract

The invention discloses a method for continuously preparing epoxy-propane, which is characterized in that a reactant containing propylene and hydrogen peroxide is continuously injected into a reaction system from a feed inlet, the raw powder form titanium silicate molecular sieve as a catalyst and the reactant are mixed uniformly to form slurry for reacting, the molecular sieve and the liquid reactant perform solid-liquid separation in a separation system, the molecular sieve is continuously circulated in a circulation pipeline composed of the reactor and the separation system, and part of liquid product flows out of the reaction system to obtain the objective product. By coupling the reaction and the separation in the method, the liquid product can be effectively discharged from the reaction region in time, the side reaction is reduced, the conversion rate of hydrogen peroxide is higher than 95% and the selectivity of the epoxypropane is higher than 90%.

Description

technical field [0001] The invention relates to a method for producing propylene oxide, more specifically to a method for continuously producing propylene oxide by epoxidation of propylene and hydrogen peroxide in the presence of titanium-silicon molecular sieves. Background technique [0002] Propylene oxide is an important organic chemical raw material, second only to polypropylene and acrylonitrile among propylene derivatives. It is mainly used to produce polyurethane, propylene glycol, polyether polyol, oilfield demulsifier, surfactant, etc. At present, the industrial production of propylene oxide mainly adopts the chlorohydrin method and the co-oxygen method. The disadvantage of the chlorohydrin method is that a large amount of waste water is generated, which seriously pollutes the environment; while the co-oxygen method has a large investment and co-production of other low-cost The question of value-added products. [0003] The discovery of titanium-silicon molecular ...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12
CPCY02P20/52
Inventor 林民黄顺贤朱斌舒兴田慕旭宏罗一斌汪燮卿汝迎春
Owner CHINA PETROLEUM & CHEM CORP
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