Method and device for directly synthesizing hydrogen peroxide at room temperature for epoxidation of propylene

A technology of hydrogen peroxide and epoxidation, applied in chemical instruments and methods, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, inorganic chemistry, etc., can solve the difficulty of catalyst preparation , low hydrogen peroxide efficiency, difficult condition control and other problems, to solve the problem of heat removal, improve discharge uniformity, simple equipment and process

Active Publication Date: 2004-11-17
DALIAN QIYUAN TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

But the problem that this system exists is, (1) molecular oxygen and hydrogen in situ generate hydrogen peroxide efficiency low on said catalyzer, is the rate control step of whole reaction; (2) catalyst preparation difficulty is very big; (3) ) Molecular oxygen and hydrogen are chemically activated on the noble metal catalyst at the same time. It is difficult to control the conditions, and it is easy to generate a large amount of water, and it is easy to hydrogenate propylene into propane in a large amount, resulting in a very low utilization rate of raw materials.
This is obviously not conducive to practical application
In terms of plasma synthesis of hydrogen peroxide, no new reports have been seen since the 1960s

Method used

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  • Method and device for directly synthesizing hydrogen peroxide at room temperature for epoxidation of propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 (comparative example)

[0032] Hydrogen and oxygen are regulated by a flow meter and a regulating valve, and then mixed in the pipeline at a flow rate of 100 ml / min and 2 ml / min respectively, and then enter a common wire barrel type dielectric barrier discharge plasma generator. The shell of the generating device is made of silicate oxide hard glass, the wall thickness is 1.5 mm, the inner diameter is 9 mm, and the length of the discharge area is 220 mm. The generating device uses a metal copper wire with a smooth surface as the discharge electrode, and its diameter is 0.56 mm. The ground electrode of the generating device is a metal copper mesh tightly surrounding the glass shell. The generating device works in the atmospheric environment. The gas mixture after passing through the plasma of the generator was sparged in a trap containing 10 ml of methanol and then evacuated. After ventilating for 5 minutes, turn on the high-voltage AC power supply, adjus...

Embodiment 2

[0038] Example 1 was repeated, but using the self-cooling dielectric barrier discharge plasma generator of the present invention. The shell sleeve of the generating device is made of silicate oxide hard glass, the wall thickness of the inner cylinder is 1.5 mm, the inner diameter is 9 mm, and the length of the discharge area is 220 mm. The thickness of the annular gap between the inner and outer cylinders is 10 mm, and the length of the annular gap is the same as that of the discharge area. The generating device uses a metal copper wire with a smooth surface as the discharge electrode, and its diameter is 0.56 mm. The grounding electrode of the generator is served by tap water filled with annulus (conductivity is 0.078 mS / cm), the water temperature is constant at 16°C, the circulation flow rate is 1.4 liters / min, and the temperature difference between the inlet and outlet of the circulating water is controlled within 1°C. The current lead-out wire of the generating device is ...

Embodiment 3

[0044] Repeat Example 2, but the casing sleeve of the generating device is made of silicate oxide quartz glass, the discharge electrode is 18Ni9Ti stainless steel alloy, and the grounding electrode of the generating device is made of an annular gap containing 2% (mass) of sodium chloride The aqueous solution (conductivity is 9.2 3 mS / cm), then the discharge voltage of the generating device is 10KV, and the results obtained under different discharge times are:

[0045] Discharge for 10 minutes, the temperature of the inner wall of the generating device is 17oC, and the concentration of hydrogen peroxide in the collected liquid is 7.0 mmol / L;

[0046] Discharge for 30 minutes, the temperature of the inner wall of the generating device is 17oC, and the concentration of hydrogen peroxide in the collected liquid is 24.2 mmol / L;

[0047] Discharge for 60 minutes, the temperature of the inner wall of the generating device is 17oC, and the concentration of hydrogen peroxide in the col...

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Abstract

The invention relates to the apparatus and method for synthesizing hydrogen peroxide at room temperature and direct application to propylene epoxidization, wherein the reactor of the apparatus includes a coaxial sleeve configuration made of glass, the inner wall of the cartridge is a discharge medium, at the center of which a metallic discharged electrode is arranged, the mixed gas containing oxygen hydrogen flows downwards, wherein the annular space of the glass sleeve is filled with circulating water, which serves as an earth electrode.

Description

technical field [0001] The invention belongs to the technical field of plasma synthesis chemicals, and relates to a device and method for synthesizing hydrogen peroxide at room temperature and directly using it for propylene epoxidation. Background technique [0002] Propylene and hydrogen peroxide in the presence of solvents such as methanol, propylene epoxidation reaction on titanium-containing zeolites can synthesize important propylene derivatives - propylene oxide. This process route has received extensive attention all over the world in recent years. This is because, in the two kinds of industrial methods of producing propylene oxide at present, the chlorohydrin method has serious equipment corrosion and environmental pollution problems because of a large amount of use of chlorine, and the co-oxidation method (that is, the Haakon method) is due to the use of ethylbenzene or The use of isobutane as an oxygen carrier has problems such as excessive output of co-products,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/029C07D303/04
Inventor 郭洪臣周军成王祥生郭明星赵剑利宫为民
Owner DALIAN QIYUAN TECH CO LTD
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