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Preparation for epoxypropane

A propylene oxide and propylene technology, 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., and achieve high propylene oxide Selectivity, stable catalyst life, overcoming the effect of complex production process

Active Publication Date: 2008-10-01
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 the original titanium silicate (HTS) powder and 60g of a mixture of methanol and hydrogen peroxide (the molar ratio of methanol to hydrogen peroxide is 20:1), and place them in a passivated stainless steel autoclave In the reactor. Replace the air in the reactor with nitrogen and ensure that the airtightness of the entire reaction system is intact, and then switch to propylene feed. The system pressure was maintained at 0.8 MPa, and the reaction temperature was controlled at 30°C. After 0.5h of reaction, the reaction kettle was quickly placed in an ice water bath to terminate the reaction. When the temperature in the kettle dropped below 15°C, the kettle was opened for sampling, and the supernatant was taken after centrifugal separation to analyze the composition of the reaction product. The analysis result is: 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 the original titanium silicate (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 them in a passivated stainless steel autoclave for reaction器中。 Replace the air in the reactor with nitrogen and ensure that the airtightness of the entire reaction system is intact, and then switch to propylene feed. The system pressure was maintained at 0.8 MPa, and the reaction temperature was controlled at 20°C. After reacting for 0.3h, the reaction kettle was quickly placed in an ice water bath to terminate the reaction. When the temperature in the kettle dropped below 15°C, the kettle was opened for sampling, and the supernatant was taken after centrifugal separation to analyze the composition of the reaction product. The analysis result is: 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 (the mass fraction of the HTS molecular sieve is 70% and the silica sol is used as the 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 obtained was 96.6%, and the selectivity of propylene oxide was 72.5%.

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PUM

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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 is hollow 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 to a method for preparing propylene oxide by catalyzing the epoxidation of propylene and hydrogen peroxide by using titanium silicon molecular sieve as a catalytically active component. Background technique [0002] Propylene oxide (PO) is an important basic organic chemical raw material. The output of propylene derivatives is second only to polypropylene and acrylonitrile. The largest use is the production of polyether polyols for further processing and manufacturing of polyurethane , Can also be used to produce propylene glycol with a wide range of uses. In addition, propylene oxide can also be used to produce surfactants, oilfield 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 on the...

Claims

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Application Information

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IPC IPC(8): C07D301/12C07D303/04B01J29/06
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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