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Method for preparing epoxypropane

A technology of propylene and oxygen, applied in chemical instruments and methods, bulk chemical production, molecular sieve catalysts, etc., can solve the problems of rapid catalyst deactivation, low propylene conversion rate, poor stability, etc., and achieve product selectivity and activity stability Improve, increase the diffusion speed, reduce the effect of side reactions

Active Publication Date: 2011-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has low propylene conversion rate, H 2 Defects such as low effective utilization rate, fast catalyst deactivation, difficult regeneration and poor stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example illustrates the process of preparing a supported palladium / titanium silicate (0.5% Pd / HTS) catalyst by supporting palladium on a hollow titanium silicate molecular sieve (HTS).

[0044] Take 10 grams of hollow titanium-silicon molecular sieve HTS sample and add it to 20ml of PdCl with a concentration of 0.01g / ml 2 In the aqueous solution, at a temperature of 40° C., stirred for 24 hours, properly sealed therebetween, and then dried naturally at room temperature for 48 hours to obtain supported palladium / titanium-silicon molecular sieves (0.5% Pd / HTS ) catalyst, coded as A (before carrying out the reaction of preparing propylene oxide, it needs to be reductively activated for 3 hours at a temperature of 300° C. in a mixed atmosphere of nitrogen and hydrogen, the same below).

Embodiment 2

[0046] This example illustrates the process of preparing a supported palladium / titanium silicate molecular sieve (2%Pd / HTS) catalyst by using hollow titanium silicate molecular sieve (HTS) to support palladium.

[0047] Take 10 grams of hollow titanium-silicon molecular sieve HTS sample and add 15ml of water to 5ml of PdCl with a concentration of 0.01g / ml 2 In the aqueous solution, stir at a temperature of 40°C for 24 hours, properly seal it, and dry it at room temperature for 48 hours to obtain a supported palladium / titanium-silicon molecular sieve (2%Pd / HTS) prepared by using a hollow titanium-silicon molecular sieve (HTS) to support palladium. Catalyst, code is B.

Embodiment 3

[0049] Propylene, oxygen, hydrogen, solvent and titanium-silicon molecular sieve A loaded with palladium according to the molar ratio of propylene to oxygen and hydrogen are 1:1:1, the mass ratio of solvent methanol to catalyst is 50, and the temperature is 60°C and the pressure is 0.5 Under MPa, when the total gas volume space velocity is 1000h -1 The following reaction is carried out.

[0050] The results of the reaction for 2 hours are as follows: the conversion rate of propylene is 6.8%; the effective utilization rate of hydrogen is 40%; the selectivity of propylene oxide is 96%.

[0051] The results of the reaction for 8 hours are as follows: the conversion rate of propylene is 6.5%; the effective utilization rate of hydrogen is 38%; the selectivity of propylene oxide is 94%.

[0052] The results of the reaction for 120 hours are as follows: the conversion rate of propylene is 6.3%; the effective utilization rate of hydrogen is 36%; the selectivity of propylene oxide is ...

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Abstract

The invention discloses a method used for preparing propylene oxide. The method is characterized in that propylene, oxygen, hydrogen, a solvent and a catalyst are mixed for contact reaction at the temperature of 0 to 8 DEG C and the pressure of 0.1 to 3.0 MPa; the molar ratio between the propylene, the oxygen and the hydrogen is 1:(0.1 to 10):(0.1 to 10) and the mass ratio between the propylene and the catalyst is (0.1 to 50):1 and the mass ratio between the solvent and the catalyst is (10 to 1000):1; the catalyst appears as a palladium-loaded hollow titanium-silicate molecular sieve with MFI structure, and the radial length of the grain hollow cavity on the molecular sieve is between 5 and 300 nanometers; and benzene absorption is measured to be at least 70 milligram / gram under the conditions that the temperature is 25 DEG C, the P / P0 is equal to 0.10 and the absorption time is one hour; and a hysteresis loop exists between an absorption isotherm for cryogenic nitrogen absorption and a desorption isotherm. The method has high propylene conversion rate and high propylene oxide selectivity; especially the effective availability of hydrogen is higher and the stability of activity is better.

Description

technical field [0001] The present invention relates to a method for catalyzing propylene oxidation, and furthermore, the present invention relates to a method for producing propylene oxide by catalyzing propylene epoxidation with palladium-supported titanium-silicon molecular sieves. Background technique [0002] Propylene oxide (PO) is a bulk chemical raw material, which ranks among the 50 chemicals with the largest output in the world, and is the third largest organic chemical product in propylene derivatives after polypropylene and acrylonitrile. Because of its highly tensioned oxygen-containing three-membered ring, PO is very active in chemical properties and has a wide range of uses. It is mainly used to produce polyether, propylene glycol, isopropanolamine, propylene alcohol, non-polyether polyols, etc., and then to produce unsaturated polyols. Polyester resin, polyurethane, surfactant (oil field demulsifier, pesticide emulsifier and wetting agent), etc., are widely u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/04C07D303/04B01J29/89
CPCY02P20/52
Inventor 林民史春风龙军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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