Method of directly catalytic epoxidation

An epoxidation, direct technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve problems such as poor catalytic stability and decreased effective utilization rate, and achieve the effect of universal applicability

Inactive 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 that in the prior art, H 2 o 2 The aqueous solution is an oxidant, and when the epoxide is prepared by using the quaternary ammonium phosphotungstic acid heteropoly acid as a catalyst, the decomposition of the quaternary ammonium phosphotungstic heteropoly acid due to the presence of water results in poor catalytic stability, which in turn 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

[0011] For the preparation of the catalyst, refer to the literature J.Mol.Catal.A, 2001, 166:219.

[0012] 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

[0014] Add 100 milliliters of toluene and 20 milliliters of tributyl phosphates as solvent in 500 milliliters of tank reactors, then add 10 grams of 30.0 (weight)% H 2 o 2 , 0.5 gram [embodiment 1] the synthetic catalyst and 0.05 gram K 2 HPO 4 , feed 12 grams of propylene, and react for 5 hours at 60° C. and 1.5 MPa. The reaction results are shown in Table 1.

Embodiment 3

[0016] According to the steps and conditions of [Example 2], only with 0.04 gram of NaH 2 PO 4 instead of K 2 HPO 4 , and the reaction results are shown in Table 1.

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PUM

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Abstract

This invention relates to a method of directly catalyze epoxide. In existing technology takes low concentration H2O2 water solution as oxidizer, phosphorus tungsten heteropoly acid quaternary ammonium salt as catalyzer to prepare epoxide. 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 olefine, cyclenes or aromatic alkene contain 1 to 10 carbon atom and aqueous hydrogen peroxide solution as raw material, takes phosphorus tungsten heteropoly acid quaternary ammonium salt as catalyzer, takes at least one of toluene, benzene, ethylbenzene, cumene , chloroform or tributyl phosphate as solvent, takes phosphatic inorganic salt as additive, 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 epoxide.

Description

technical field [0001] The invention relates to a method for directly catalyzing epoxidation. Background technique [0002] Olefin epoxidation is an important class of chemical reactions, and epoxidation products are also a very important class of organic chemical intermediates. The chlorohydrin method and the co-oxidation method are the main methods for industrial production of epoxides 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 Obviously constrained by market factors. Silver catalyst can not show satisfactory effect (US 5864047; Catal.Lett., 1999,58:67; Catal.Today, 2004 , 93-95: 173). 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/12B01J27/188
Inventor 金国杰高焕新杨洪云
Owner CHINA PETROLEUM & CHEM CORP
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