System and process for preparing epoxypropane based on micro-interface enhanced propylene epoxidation

A technology of propylene oxide and epoxidation, which is applied in chemical/physical/physical chemical processes, chemical/physical/physical chemical reactors, organic chemistry, etc., can solve the problem of low reaction efficiency of the system, and achieve improved reaction efficiency, The effect of ensuring the reaction rate and increasing the phase boundary area

Inactive Publication Date: 2021-03-16
NANJING YANCHANG REACTION TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To this end, the present invention provides a system and process for preparing propylene oxide based on micro-interface enhanced propylene epoxidation to overcome the problem of low system reaction efficiency caused by inhomogeneous mixing between materials and by-products in the prior art

Method used

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  • System and process for preparing epoxypropane based on micro-interface enhanced propylene epoxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Use above-mentioned system and process to carry out propylene oxide to prepare propylene oxide, wherein:

[0082] In the process, the reaction temperature in the reactor is 20°C, the reaction pressure is 0.1MPa, the molar ratio of propylene gas to oxygen source solution is 1.2:1, and the catalyst space velocity is 1.20h -1 .

[0083] The gas-liquid ratio in the first micro-interface generator is 1000:1, and the gas-liquid ratio in the second micro-interface generator is 400:1.

[0084] After testing, after using the system and process, H 2 o 2 The conversion rate of propylene gas is 97.2%, the conversion rate of propylene gas is 7.5%, and the selectivity of PO is 95.3%.

Embodiment 2

[0086] Use above-mentioned system and process to carry out propylene oxide to prepare propylene oxide, wherein:

[0087] In the process, the reaction temperature in the reactor is 35°C, the reaction pressure is 0.2MPa, the molar ratio of propylene gas to oxygen source solution is 1.5:1, and the catalyst space velocity is 1.05h -1 .

[0088] The gas-liquid ratio in the first micro-interface generator is 1150:1, and the gas-liquid ratio in the second micro-interface generator is 420:1.

[0089] After testing, after using the system and process, H 2 o 2 The conversion rate of propylene gas is 97.8%, the conversion rate of propylene gas is 7.7%, and the selectivity of PO is 95.6%.

Embodiment 3

[0091] Use above-mentioned system and process to carry out propylene oxide to prepare propylene oxide, wherein:

[0092] In the process, the reaction temperature in the reactor is 42°C, the reaction pressure is 0.5MPa, the molar ratio of propylene gas to oxygen source solution is 1.9:1, and the catalyst space velocity is 0.68h -1 .

[0093] The gas-liquid ratio in the first micro-interface generator is 1280:1, and the gas-liquid ratio in the second micro-interface generator is 490:1.

[0094] After testing, after using the system and process, H 2 o 2 The conversion rate of propylene gas is 98.1%, the conversion rate of propylene gas is 8.1%, and the selectivity of PO is 96.1%.

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Abstract

The invention relates to a system and process for preparing epoxypropane based on micro-interface enhanced propylene epoxidation. The system comprises a reactor, a micro-interface generator and a return pipe. Propylene gas is crushed to form micron-sized bubbles, and the micron-sized bubbles are mixed with raw material liquid to form a gas-liquid emulsion, so that the phase interface area of a gasphase and a liquid phase is increased, and the effect of enhancing mass transfer within a lower preset operation condition range is achieved; and meanwhile, the micron-sized bubbles can be fully mixed with the raw material liquid to form a gas-liquid emulsion, and an oxygen source solution in the system can be in full contact with the propylene gas by fully mixing the gas phase and the liquid phase, so that the generation of byproducts is prevented, and the reaction efficiency of the system is further improved.

Description

technical field [0001] The invention relates to the technical field of propylene epoxidation, in particular to a system and process for preparing propylene oxide based on micro-interface enhanced propylene epoxidation. Background technique [0002] Propylene oxide (PO) is an important basic chemical raw material. It ranks among the 50 chemicals with the largest output in the world. It is the third largest organic chemical product in the 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 used in chemical industry, light industry, medicine, foo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/08B01J8/00B01J8/22B01J19/00C07D301/12C07D303/04
CPCB01J8/0015B01J8/082B01J8/22B01J19/0093B01J2208/00044B01J2208/0007C07D301/12C07D303/04B01J8/00B01J8/08B01J19/00C07D301/02
Inventor 张志炳张锋周政李磊孟为民王宝荣杨高东罗华勋杨国强田洪舟
Owner NANJING YANCHANG REACTION TECH RES INST CO LTD
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