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A process and system for preparing propylene oxide by direct oxidation of propylene with oxygen and hydrogen

A technology of propylene oxide and propylene oxide, which is applied in the field of process and system, can solve the problems of incomplete treatment of impurities, large environmental pollution, high energy consumption of the system, and achieve the effects of easy retention time, low equipment investment, and simple equipment form

Active Publication Date: 2016-08-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a process for preparing propylene oxide by directly oxidizing propylene with oxygen and hydrogen, so as to solve the problems of high energy consumption, large environmental pollution, low yield and incomplete treatment of impurities in the process system existing in the prior art. The problem

Method used

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  • A process and system for preparing propylene oxide by direct oxidation of propylene with oxygen and hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Add propylene, recycled propylene, and dialkyl sulfide to a mixed solvent in which the ratio of methanol and hydrazine hydrate is 10:2, mix in mixer 4, and then mix it in a mixture containing palladium catalyst and TS-1 titanium silicon Oxidation reaction is carried out in the reactor 8 of salt molecular sieve, the ratio of hydrogen and oxygen is 1:2, the reaction pressure is 0.5MPa, and the reaction temperature is 50°C. Finally, a crude product of propylene oxide is produced.

[0040](2) After the reaction product is cooled, it is pumped into the crude fractionation tower 10, the pressure at the top of the crude fractionation tower is 0.15 MPa, and the temperature of the bottom of the tower is controlled at 120°C. Remove organic sulfides and high-boiling by-products, and enter the crude component recovery tower 13 from the bottom of the tower after separation of organic sulfides and high-boiling by-products.

[0041] (3) The remaining propylene and propylene oxide...

Embodiment 2

[0044] (1) Add propylene, circulating propylene, and dialkyl sulfide to a mixed solvent in which the ratio of methanol and hydrazine hydrate is 5:1, mix in mixer 4, and then add ruthenium catalyst and TS-1 titanium silicon Oxidation reaction is carried out in the reactor 8 of salt molecular sieve, the ratio of hydrogen and oxygen is 1:1, the reaction pressure is 3MPa, and the reaction temperature is 30°C. Finally, a crude product of propylene oxide is produced.

[0045] (2) After the reaction product is cooled, it is pumped into the crude fractionation tower 10, the pressure at the top of the crude fractionation tower is 0.05 MPa, and the temperature of the bottom of the tower is controlled at 110°C. The organic sulfides and high-boiling by-products are removed. After the organic sulfides and high-boiling by-products are separated, they enter the crude component recovery tower 13 from the bottom of the tower.

[0046] (3) The remaining propylene and propylene oxide mixture en...

Embodiment 3

[0049] (1) Add propylene, recycled propylene, and dialkyl sulfide to a mixed solvent with a ratio of 15:5 of methanol and hydrazine hydrate, mix in mixer 4, and then add gold catalyst and Ti-MWW titanium silicon The oxidation reaction is carried out in the reactor 8 of acid salt molecular sieve, the ratio of hydrogen and oxygen is 50:1, the reaction pressure is 1MPa, and the reaction temperature is 80°C. Finally, a crude product of propylene oxide is produced.

[0050] (2) After the reaction product is cooled, it is pumped into the crude fractionation tower 10, the pressure at the top of the crude fractionation tower is 0.2 MPa, and the temperature of the bottom of the tower is controlled at 130°C. Remove organic sulfides and high-boiling by-products, and enter the crude component recovery tower 13 from the bottom of the tower after the organic sulfides and high-boiling by-products are separated.

[0051] (3) The remaining propylene and propylene oxide mixture enters the prop...

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Abstract

The invention provides a technique and a system for preparing propylene oxide by directly oxidizing propylene with oxygen and hydrogen. The technique comprises the following steps that: (1) propylene, circulation propylene, and high-boiling-point organic sulfide are added to a mixed solvent of methanol and hydrazine hydrate, hydrogen and oxygen are accessed, and raw propylene oxide is produced; (2) raw propylene oxide is cooled and pumped into a rough separation tower by a pump, and organic sulfide and a few of high-boiling-point by-products in raw propylene oxide are removed; (3) a balance mixture of propylene and propylene oxide enters a propylene stripping tower, and unreacted propylene and a little propylene oxide in the mixture are removed; and (4) balance propylene oxide mixed liquor enters an extraction purification tower containing cumin and an alkaline solution, and is further extracted and rectified to form propylene oxide with high purity. The technique and the system are energy-saving and environmentally friendly, can increase the purity and the yield of propylene oxide significantly, reduce the losses of propylene oxide, and are suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a process and a system for directly oxidizing propylene with oxygen and hydrogen to prepare propylene oxide. Background technique [0002] Propylene oxide (PO) is a very important basic organic raw material. It is the third largest propylene organic chemical product after polypropylene and acrylonitrile among propylene derivatives. It is mainly used in the production of polyether polyol and propylene glycol. , glycerol, isopropanolamine, non-polyether polyols, etc., and then produce surfactants, flame retardants, unsaturated polyester resins, polyurethanes, etc., and are widely used in chemical industry, light industry, military industry, aerospace, medicine, food It has a wide range of applications in industries such as textiles and textiles, and has a profound impact on the development of the chemical industry and the national economy. With the expansion of PO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/06C07D301/10C07D301/08C07D301/32
CPCC07D301/06C07D301/08C07D301/10C07D301/32C07D303/04Y02P20/10Y02P20/52
Inventor 姚正军刘沛江周金堂王占红
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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