Solid catalyst for preparing epoxy phenylethane by epoxidation of styrene and preparation method

A technology of ethylene oxide and solid catalyst, which is used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of immaturity, serious pollution, and difficult catalyst recovery, and achieve material consumption and energy consumption. The effect of high and lower production cost

Inactive Publication Date: 2004-12-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, although oxygen and air are ideal as oxygen sources to oxidize styrene to styrene oxide, this method is not mature at this stage, and most of them use complex catalysts, which are operated in a homogeneous reaction mode, and the catalysts are difficult to obtain. Recycling, serious pollution, so it is necessary to find a new solid-phase catalyst and reaction system that is easy to separate from the product and can be used repeatedly, and ensure high styrene conversion rate and selectivity of styrene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: take by weighing 5.6g FeSO 4 ·7H 2 O was dissolved in 200g of deionized water, weighed 5.0g of NaY molecular sieve with a silicon-aluminum ratio n of 5.6 according to the proportion, added to the above solution, and then adjusted the pH of the mixed solution to 4.0-5.0 with 0.001-0.01M dilute sulfuric acid, and then Stir for 4 hours under the protection of argon; filter the above mixture, wash it fully with a large amount of deionized water to remove unexchanged iron ions; then dry the filter cake in vacuum at 40°C for 1 day, and grind the dried solid into powder to get 3.5wt% Fe 2+ / NaY catalyst. NaY-type molecular sieves are prepared by hydrothermal synthesis, and Table 1 shows their chemical composition and physical and chemical properties.

[0016] name

NaY

Exterior

powdery

change

study

Group

become

SiO 2

wt%

67.3

Al 2 o 3

wt%

20.3

Na 2 o

wt% ...

Embodiment 2

[0019] Embodiment 2: take by weighing 2.8g FeSO 4 ·7H 2 O was dissolved in 200g of deionized water, weighed 5.0g of NaY molecular sieve with a silicon-aluminum ratio n of 5.6 according to the proportion, added to the above solution, and then adjusted the pH of the mixed solution to 4.0-5.0 with 0.001-0.01M dilute sulfuric acid, and then Stir for 4 hours under the protection of argon; filter the above mixture, wash it fully with a large amount of deionized water to remove unexchanged iron ions; then dry the filter cake in vacuum at 40°C for 1 day, and grind the dried solid into powder 2.1wt% Fe was obtained 2+ / NaY catalyst. The preparation, chemical composition and physicochemical properties of the NaY type molecular sieve are the same as in Example 1.

[0020] The catalytic reaction is carried out in an atmospheric bath reactor. Pipette 1.146ml of styrene and 20ml of dimethylformamide (DMF) solvent into a 100ml glass flask, then weigh 0.2g of catalyst and drop into the ab...

Embodiment 3

[0022] Embodiment 3: take by weighing 4.6g FeSO 4 ·7H 2 O was dissolved in 200g of deionized water, weighed 5.0g of NaY molecular sieve with a silicon-aluminum ratio n of 5.6 according to the proportion, added to the above solution, and then adjusted the pH of the mixed solution to 4.0-5.0 with 0.001-0.01M dilute sulfuric acid, and then Stir for 4 hours under the protection of argon; filter the above mixture, wash it fully with a large amount of deionized water to remove unexchanged iron ions; then dry the filter cake in vacuum at 40°C for 1 day, and grind the dried solid into powder Calcined at 550°C for 6h to get 2.9wt% Fe 2+ / NaY-550°C catalyst. The preparation, chemical composition and physicochemical properties of the NaY type molecular sieve are the same as in Example 1. The catalytic reaction is carried out in an atmospheric bath reactor. Pipette 1.146ml of styrene and 20ml of dimethylformamide (DMF) solvent into a 100ml glass flask, then weigh 0.2g of catalyst and d...

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PUM

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Abstract

The solid catalyst consists of VIII metal ion exchanged into molecular sieve, and has the composition of mAn+/[MI, MII]O.Al2O3.xSiO2, where [MI, MII]O.Al2O3.xSiO2 is microporous molecular sieve, MI and MII are one-valent and two-valent metal separately, x is the Si/Al ratio in the molecular sieve, An+ is VIII metal ion, m is the percentage content of VIII metal ion in the catalyst. The microporous molecular sieve is X, Y, L, Beta, Mordenite, MCM-22, etc. The VIII metal is Fe or Co. Under proper reaction condition, the styrene converting rate within 4 hr may reach 40 %, epoxide selectivity may reach 60 %, and the side product is benzaldehyde mainly except small amount of phenylacetaldehyde and benzoic acid. The catalyst has no obviously lowered styrene converting rate and epoxide selectivity after repeated use.

Description

technical field [0001] The invention relates to a solid catalyst for producing styrene oxide by epoxidation of styrene with oxygen as an oxygen source. Background technique [0002] Styrene oxide can be used as a diluent, UV-absorber, and flavor enhancer for epoxy resins, and is also an important intermediate in organic synthesis, pharmaceuticals, and fragrance industries, such as β-benzene produced by hydrogenation of styrene oxide Ethanol is the main component of rose oil, clove oil, neroli oil, and is widely used in the preparation of food, tobacco, soap and cosmetic essence. In recent years, the demand for β-phenylethyl alcohol and medicine levamisole has increased sharply at home and abroad, and the supply of styrene oxide has been in short supply, which has brought broad development prospects to the research on the preparation of styrene oxide. [0003] Industrially, styrene oxide is prepared by haloalcohol method or hydrogen peroxide catalyzed epoxidation of styrene....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/064C07D301/04
Inventor 张庆红汤清虎梁军王野
Owner XIAMEN UNIV
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