Device and method for preparing propylene oxide

A technology of propylene oxide and epoxidation reaction, which is applied in the production of bulk chemicals and organic chemistry, etc. It can solve the problems of overheating, high reaction temperature, and low selectivity of the product propylene oxide, so as to avoid the formation of hot spots , The epoxidation reaction is mild, and the effect of overcoming the problem of overheating

Active Publication Date: 2017-05-10
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] CN104557781A discloses a method for producing propylene oxide, which mainly solves the problem of high reaction temperature rise in the prior art and the need for a higher molar ratio of propylene to peroxide in order to maintain a higher reaction efficiency
[0010] Although the HPPO process has significant advantages such as environmentally friendly process and less co-produced by-products, due to the presence of a large amount of solvent (such as methanol), water and excess propylene in the epoxidation reaction process, and the olefin epoxidation reaction is strongly exothermic Therefore, the HPPO process still has low production efficiency, incomplete conversion of raw materials (hydrogen peroxide), and strong exothermic reaction may lead to runaway temperature, which may cause damage to the reaction device and catalyst.
[0011] In the above-mentioned published patents, for the method for preparing propylene oxide by epoxidation of propylene, fixed bed, moving bed, slurry bed, and combination of moving bed and slurry bed are used to solve the epoxidation reaction process in a targeted manner. Issues such as heat release, insufficient feedstock conversion, and low production efficiency
However, judging from the existing literature and patent reports, it is still necessary to develop a new propylene epoxidation process to simply and efficiently solve the incomplete conversion of hydrogen peroxide and the low effective utilization of hydrogen peroxide in the HPPO process. , Low selectivity of the product propylene oxide, strong exothermic reaction may lead to overheating and many other problems

Method used

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  • Device and method for preparing propylene oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Adopt the method for above-mentioned device to prepare propylene oxide:

[0061] (1) Preparation of high-strength titanium silicalite molecular sieve microspheres

[0062] TS-1 zeolite is prepared by traditional hydrothermal synthesis method: mix and stir ethyl orthosilicate, tetrabutyl titanate, isopropanol, tetrapropylammonium hydroxide and deionized aqueous solution evenly to obtain gel, gel Medium SiO 2 : TiO 2 :TPAOH:H 2 The molar ratio of O is 1:0.025:0.3:25; distill off isopropanol and ethanol generated by hydrolysis; then move the gel to a hydrothermal synthesis kettle with polytetrafluoroethylene, and crystallize at 170°C for 48h . The crystallized product was filtered, fully washed, dried in the air atmosphere at 110°C for 12 hours, and calcined in the air atmosphere at 550°C for 3 hours to obtain nanometer TS-1 zeolite.

[0063] The nanometer TS-1 zeolite is evenly dispersed in the silica sol, and then spray-dried to make high-strength microspheres with ...

Embodiment 2

[0075] The operation steps are the same as in Example 1, except that the propylene epoxidation reaction temperature in the bubble column slurry bed reactor and the stirred tank slurry bed reactor is 80-90°C. After the reaction in the bubble column slurry bed reactor 1, the conversion rate of hydrogen peroxide in the raw material is ≥ 90%; after the reaction in the stirred tank slurry bed reactor 3 or the stirred tank slurry bed reactor II 4, the reaction product is The selectivity of oxypropylene is ≥91.5%, and the total conversion rate of hydrogen peroxide is ≥99%.

Embodiment 3

[0077] The operation steps are the same as in Example 1, except that the pressure of the propylene epoxidation reaction in the bubble column slurry bed reactor and the stirred tank slurry bed reactor is 0.11 MPa. After the reaction in the bubble column slurry bed reactor 1, the conversion rate of hydrogen peroxide in the raw material is ≥ 61%; after the reaction in the stirred tank slurry bed reactor 3 or the stirred tank slurry bed reactor II 4, the reaction product is The selectivity of oxypropylene is ≥98%, and the total conversion rate of hydrogen peroxide is ≥82%.

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Abstract

The invention discloses a device and a method for preparing propylene oxide. The device sequentially comprises a bubble tower slurry column reactor, a settling separation unit and a stirred tank slurry column reactor. According to the method, the bubble tower slurry column reactor and the stirred tank slurry column reactor are combined for epoxidation reaction under the reaction conditions of reaction pressure of 0.1 to 0.6MPa and reaction temperature of 40 to 70 DEG C. Local hot spots generated by strong reaction heat in a reaction process can be effectively avoided, and generation of a byproduct by back mixing of a liquid phase can also be effectively avoided. The advantages of high hydrogen peroxide conversion rate (more than or equal to 99 percent), high hydrogen peroxide effective utilization rate (more than or equal to 95 percent) and high propylene oxide product selectivity (more than or equal to 98 percent) are achieved.

Description

technical field [0001] The invention relates to a device and a method for preparing propylene oxide by epoxidation of olefins. Background technique [0002] Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is a very important basic organic chemical raw material. It is mainly used to produce polyether polyols, and then to produce polyurethane. Propylene oxide can also be used to prepare non-ionic surfactants, propylene alcohol, propylene glycol, and synthetic glycerin. Fine chemicals derived from propylene oxide are used in almost all industrial sectors and in everyday life. [0003] Chlorohydrin method, co-oxidation method and direct oxidation method are relatively mature propylene oxide production technologies in industry. In particular, the method of using titanium-silicon molecular sieve as a catalyst and using hydrogen peroxide to directly oxidize propylene oxide (HPPO method for short) overcomes the disadvantages of t...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12C07D301/32
CPCY02P20/52C07D303/04C07D301/12C07D301/32
Inventor 刘国东李进王炳春
Owner CHINA CATALYST HLDG CO LTD
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