Preparation for epoxypropane

A propylene oxide and epoxidation technology, which is applied in chemical instruments and methods, bulk chemical production, molecular sieve catalysts, etc., can solve the problems of low propylene oxide selectivity, poor catalyst stability, environmental pollution, etc. Oxypropane selectivity, stable catalyst life, overcoming the effect of complex production process

Active Publication Date: 2011-01-19
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the pretreated catalyst has the problem of poor stability
[0008] To sum up, in the existing industrial production process of propylene oxide, there is environmental pollution, which does not meet the requirements of contemporary green chemical production; and the reported epoxidation of propylene and hydrogen peroxide with titanium silicon molecular sieve to produce epoxy In the propane technology, although the problem of environmental pollution by the chlorohydrin method has been solved, there is a problem that the selectivity of the target product propylene oxide is low, or while the selectivity of propylene oxide is improved, there is a problem of poor catalyst stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 0.5g of new titanium-silicon molecular sieve (HTS) raw powder and 60g of methanol and hydrogen peroxide mixture (the molar ratio of methanol to hydrogen peroxide is 20:1), and place them in a passivated stainless steel autoclave in the reactor. Nitrogen was used to replace the air in the reactor, and the airtightness of the entire reaction system was ensured, and then the feed was switched to propylene. The system pressure was maintained at 0.8 MPa, and the reaction temperature was controlled at 30°C. After reacting for 0.5 h, the reactor was quickly placed in an ice-water bath to terminate the reaction. When the temperature in the kettle dropped below 15°C, open the kettle to take samples, and after centrifugation, take the supernatant to analyze the composition of the reaction product. The analysis results are: the conversion rate of hydrogen peroxide is 98.6%, and the selectivity of propylene oxide is 75.3%.

Embodiment 2

[0032] Weigh 1.0g of new titanium-silicon molecular sieve (HTS) powder and 60g of a mixture of methanol and hydrogen peroxide (the molar ratio of methanol to hydrogen peroxide is 40:1), and place it in a passivated stainless steel autoclave for reaction device. Nitrogen was used to replace the air in the reactor, and the airtightness of the entire reaction system was ensured, and then the feed was switched to propylene. The system pressure was maintained at 0.8MPa, and the reaction temperature was controlled at 20°C. After reacting for 0.3 h, the reactor was quickly placed in an ice-water bath to terminate the reaction. When the temperature in the kettle dropped below 15°C, open the kettle to take samples, and after centrifugation, take the supernatant to analyze the composition of the reaction product. The analysis results are: the conversion rate of hydrogen peroxide is 98.2%, and the selectivity of propylene oxide is 85.1%.

Embodiment 3

[0037] According to the evaluation method described in Comparative Example 3, the catalytic performance of the shaped HTS molecular sieve catalyst (with a mass fraction of HTS molecular sieve of 70% and silica sol as a binder) was investigated under the same experimental conditions. After the reaction was stable for 1 hour, the reaction product was sampled and analyzed. The utilization rate of hydrogen peroxide was 96.6%, and the selectivity of propylene oxide was 72.5%.

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Abstract

The invention relates to a method for preparing propylene oxide, which adopts hydrogen peroxide as an oxidizer under the existence of a solvent and prepares propylene oxide through epoxiding propylene. The method of the invention is characterized in that in the method, the active element of catalyst is a Ti-Si molecular sieve with MFI structure, and the crystalline grain of the molecular sieve ishollow in structure; the radial length of the hollow part of the hollow crystalline grain is 5 to 300nm; under the conditions of 25 DEG C, P / P0 being equal to 0.10 and adsorption time being one hour,the adsorptive capacity of the molecular sieve sample tested is at least 70mg / g, and a hysteresis loop exists between the adsorption isotherm and the desorption isotherm absorbed by cryogenic nitrogen of the molecular sieve. The catalyst agent of the method has good stability, and also the method has high selectivity of propylene oxide, high utilization rate of hydrogen peroxide with mild reaction condition and easy operation.

Description

technical field [0001] The invention relates to a method for preparing propylene oxide, and more specifically relates to a method for preparing propylene oxide by catalyzing the epoxidation of propylene and hydrogen peroxide by using titanium-silicon molecular sieve as a catalytic active component. Background technique [0002] Propylene oxide (PO for short) is an important basic organic chemical raw material. Its output in propylene derivatives is second only to polypropylene and acrylonitrile. The largest use is to produce polyether polyols for further processing to manufacture polyurethane , It can also be used to produce propylene glycol which is widely used. In addition, propylene oxide can also be used to produce surfactants, oil field demulsifiers, etc. [0003] With the wide application of polyurethane materials and unsaturated resins, the demand for propylene oxide is increasing year by year. At present, the industrial production of propylene oxide is mainly based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12B01J29/06C07D303/04
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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