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Process for the preparation of ethylene oxide from oxygen and ethylene

A technology of ethylene oxide and ethylene, applied in the direction of organic chemistry, etc., can solve problems such as poor safety, reduce the risk of explosion, improve the conversion rate and selectivity, and avoid the effect of overheating

Active Publication Date: 2019-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of poor security in the prior art, and a new method for preparing ethylene oxide from oxygen and ethylene is provided

Method used

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  • Process for the preparation of ethylene oxide from oxygen and ethylene
  • Process for the preparation of ethylene oxide from oxygen and ethylene
  • Process for the preparation of ethylene oxide from oxygen and ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A process for the preparation of ethylene oxide from oxygen and ethylene, such as figure 1 or figure 2 shown. The reaction raw material ethylene gas is heated to 180°C by a gas-gas heat exchanger and then enters the oxygen-permeable membrane tube in the reactor. The material of the oxygen-permeable membrane tube is a mixed conductor inorganic ceramic membrane. In the area outside the oxygen-permeable membrane tube in the reactor, oxygen is adsorbed and desorbed on the surface of the oxygen-permeable membrane, and then enters the oxygen-permeable membrane tube to contact with ethylene, and reacts under the silver catalyst to produce products including ethylene oxide. The outlet of the membrane tube flows out and enters the downstream separation system after passing through the gas-gas heat exchanger, and the remaining nitrogen-enriched air is discharged from the reactor.

[0021] The operating conditions of the reactor are a temperature of 180° C. and a pressure of 2....

Embodiment 2

[0024] According to the conditions and steps described in Example 1, only the ethylene gas is heated to 185°C by the gas-gas heat exchanger and then enters the oxygen-permeable membrane tubes in the reactor. The operating conditions of the reactor are a temperature of 185° C. and a pressure of 2.05 MPaG. The volume ratio of the ethylene to air is 1:9.2. The oxygen content in the nitrogen-enriched air is 15.4%. The results show that the single-pass conversion of ethylene is 13.6%, and the selectivity of ethylene oxide is 95.2%.

Embodiment 3

[0026] According to the conditions and steps described in Example 1, only the ethylene gas is heated to 192°C by the gas-gas heat exchanger and then enters the oxygen-permeable membrane tubes in the reactor. The operating conditions of the reactor are a temperature of 192° C. and a pressure of 2.06 MPaG. The volume ratio of ethylene to air is 1; 9.5. The oxygen content in the nitrogen-enriched air is 13.6%. The results show that the single-pass conversion of ethylene is 14.8%, and the selectivity of ethylene oxide is 95.6%.

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Abstract

The invention relates to a method for preparing epoxyethane from oxygen and ethylene. The method is mainly used for solving the problem in the prior art that the safety is relatively poor. According to the method, through adopting the technical scheme that the method for preparing the epoxyethane from the oxygen and the ethylene comprises the steps that reactant ethylene gas is heated by a gas-gas heat exchanger and then enters at least one oxygen-transmission membrane tube in a reactor, the oxygen-transmission membrane tubes are made from mixed-conductor inorganic ceramic membranes and are of calandria arrangement, air enters an area, outside the oxygen-transmission membrane tubes, in the reactor, the oxygen is subjected to adsorption and desorption on surfaces of oxygen-transmission membranes and then enters the oxygen-transmission membrane tubes to be in contact with the ethylene, a reaction is carried out in the presence of a catalyst to produce a product containing the epoxyethane, the product flows out from outlets of the oxygen-transmission membrane tubes, passes through the gas-gas heat exchanger and then enters a downstream separating system, and remaining nitrogen-enriched air is discharged from the reactor, the problem is better solved, so that the method can be applied to the preparation of the epoxyethane.

Description

technical field [0001] The present invention relates to a process for the preparation of ethylene oxide from oxygen and ethylene. Background technique [0002] Ethylene oxide is an important organic chemical product among the industrial derivatives of ethylene. At present, its production process generally uses a fixed-bed reactor to make oxygen and ethylene undergo oxidation and exothermic reaction on a silver catalyst. Before entering the reactor, ethylene and oxygen are mixed through the oxygen mixer. The mixing effect of oxygen and ethylene directly affects the selectivity and conversion rate of the catalytic reaction. This kind of direct contact mixing, the reaction process has reaction temperature out of control, and explosion occurs. huge risk. [0003] Mixed conductor oxygen permeable membrane is a kind of inorganic ceramic membrane material with both oxygen ion and electronic conductivity. Driven by high temperature and oxygen concentration gradient, oxygen can diff...

Claims

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Application Information

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IPC IPC(8): C07D301/10C07D303/04
CPCC07D301/10C07D303/04
Inventor 刘静如王振刚张帆徐伟石宁
Owner CHINA PETROLEUM & CHEM CORP
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