Production method of epoxy propane

A technology for the production of propylene oxide, which is applied in the direction of organic chemistry, can solve the problems of high separation energy consumption, decreased effective utilization rate, poor catalyst stability, etc., and achieves the reduction of separation energy consumption, the improvement of effective utilization rate, and the improvement of stability Effect

Active Publication Date: 2007-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to use low concentration H in the prior art 2 o 2 The aqueous solution is an oxidizing agent, and when propylene oxide is prepared by using phosphotungstic heteropolyacid quaternary ammonium salt as a catalyst, the separation energy consumption is high due to the existence of water, and the catalyst stability is poor due to the decomposition of phosphotungstic heteropolyacid quaternary ammonium salt, which leads to H 2 o 2 The problem of the decline of effective utilization rate provides a new method of direct catalytic epoxidation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] For the preparation of the catalyst, refer to the literature J.Mol.Catal.A, 2001, 166:219.

[0011] Take by weighing 10.0 grams of tungstic acid and add to 40 milliliters of 30 (weight)% H 2 o 2 In an aqueous solution, stir and heat to 60°C for 60 minutes to obtain a colorless transparent solution. To this solution was added 2.45 ml of aqueous phosphoric acid (40 ml of phosphoric acid in 100 ml of aqueous phosphoric acid), diluted with 80 ml of distilled water and stirring was continued for 30 minutes. 6.9 grams of cetyltrimethylammonium chloride and 3.0 grams of octadecyltrimethylammonium chloride are dissolved in the mixed solution of 160 milliliters of ethylene dichloride, dropwise in the above-mentioned solution rapidly, and continue to stir for 60 A precipitate was formed in 10 minutes, and the precipitate was washed with distilled water until the pH value of the filtrate was about 4, and the filter cake was placed in a rotary evaporator, and vacuum-dried at 60°C...

Embodiment 2

[0013] Adding 120 milliliters of toluene in a 500 milliliter tank reactor is a solvent, then adding 8.0 grams of 60.0 (weight)% H 2 o 2 , 0.45 gram of the catalyst synthesized in [Example 1], and feed 20 gram of chemical grade propylene, and reacted for 8 hours at 55° C. and 1.6 MPa conditions. The reaction results are shown in Table 1.

Embodiment 3

[0015] Adding 120 milliliters of cumene in a 500 milliliter tank reactor is a solvent, then adding 7 grams of 70.0 (weight)% H 2 o 2 , 0.5 gram of the catalyst synthesized in [Example 1], and feed 15 gram of polymer grade propylene, and reacted for 6 hours at 50°C and 1.7MPa conditions, the reaction results are shown in Table 1.

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Abstract

This invention relates to a preparation method of propylene oxide. In existing technology takes low concentration H2O2 water solution as oxidizer, phosphorus tungsten heteropoly acid quaternary ammonium salt as catalyzer to prepare propylene oxide. This invention mainly solve the problem in existing technology of separation energy high caused by water, as well as catalyst stability low caused by decompound of phosphorus tungsten heteropoly acid quaternary ammonium salt, and problem of H2O2 activity factor descending. This invention takes propylene and aqueous hydrogen peroxide solution of weight percent concentration 40 to 80 as raw material, takes phosphorus tungsten heteropoly acid quaternary ammonium salt as catalyzer, takes at least one of toluene, benzene, ethylbenzene, cumene or chloroform as solvent, under 20 to 100deg reaction temperature and 0 to 3.0 Mpa reaction pressure, to carry out reaction for 0.5 to 24 hours. It best solve existing problem, can be used in industrial production of propylene oxide.

Description

technical field [0001] The present invention relates to a kind of production method of propylene oxide. Background technique [0002] The chlorohydrin method and the co-oxidation method are the main methods for the production of propylene oxide in the industry at present, but the former produces a large amount of halogen-containing wastewater in the production process, causing serious environmental pollution; the latter produces equimolar co-products, and its Economic benefits are obviously constrained by market factors. TS-1 molecular sieve in H 2 o 2 As an oxidizing agent, although propylene oxide can be catalyzed to produce propylene oxide under mild conditions (EP100119; Catal. Today, 1993, 18: 163; CN1268400), due to economic and technical reasons, it has not yet been industrialized. [0003] The reaction control phase transfer catalyst (a quaternary ammonium salt of phosphotungstic acid) catalyzes the epoxidation reaction of propylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12C07D303/04
Inventor 高焕新金国杰杨洪云
Owner CHINA PETROLEUM & CHEM CORP
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