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Method for catalyzing propene epoxidation by taking Titanium Silicalite-1(TS-1) as catalyst

A molecular sieve technology for catalyzing propylene and epoxidation reactions, applied in organic chemistry and other directions, can solve the problems of reducing the yield of propylene oxide and unreasonable addition amount.

Inactive Publication Date: 2012-07-11
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been found through experiments that although this method can improve the selectivity of propylene oxide, if the amount of addition is unreasonable, it is easy to reduce the yield of propylene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 0.5 g of ammonia water and 9.2 g of ammonium sulfate, dissolve them in 200 mL of deionized water, and prepare an ammonia water buffer solution.

[0024] Add 0.8g of titanium-silicon molecular sieve TS-1 (Si:Ti=10), 55g of methanol and 2.2g of the above-mentioned ammonium ammonium sulfate buffer solution into a 250mL batch reactor, use magnetic stirring to mix the materials evenly and replace them with nitrogen Air in the reactor. Heat in a water bath to increase the temperature of the system to 40° C., add 7.3 g of hydrogen peroxide with a mass concentration of 30%, and feed propylene gas to maintain the system pressure at 0.4 MPa. After reacting for 1.5h, the catalyst was separated by centrifugation, and the liquid phase was analyzed by gas chromatography. The results are shown in the table below.

Embodiment 2

[0026] Take 0.5g ammonia water and 8.0g ammonium nitrate, dissolve in 200mL deionized water, and prepare ammonia water buffer solution.

[0027] Add 0.85g of titanium-silicon molecular sieve TS-1 (Si:Ti=25), 60g of methanol and 2.2g of the above ammonia ammonium nitrate buffer solution into a 250mL batch reactor, use magnetic stirring to mix the materials evenly, and replace them with nitrogen Air in the reactor. Heat in a water bath to increase the temperature of the system to 45° C., add 7.3 g of hydrogen peroxide with a mass concentration of 30%, and feed propylene gas to maintain the system pressure at 0.4 MPa. After reacting for 1.5h, the catalyst was separated by centrifugation, and the liquid phase was analyzed by gas chromatography. The results are shown in the table below.

Embodiment 3

[0029] Take 0.5 g of ammonia water and 7.5 g of ammonium chloride, dissolve them in 200 mL of deionized water, and prepare an ammonia water buffer solution.

[0030] Add 0.88g of titanium-silicon molecular sieve TS-1 (Si:Ti=50), 50g of methanol and 3.1g of ammonia ammonium chloride buffer solution into a 250mL batch reactor, use magnetic stirring to mix the materials evenly and replace them with nitrogen Air in the reactor. Heat in a water bath to increase the temperature of the system to 50° C., add 7.3 g of hydrogen peroxide with a mass concentration of 30%, and feed propylene gas to maintain the system pressure at 0.4 MPa. After reacting for 1.5h, the catalyst was separated by centrifugation, and the liquid phase was analyzed by gas chromatography. The results are shown in the table below.

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PUM

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Abstract

The invention discloses a method for catalyzing propene epoxidation by taking Titanium Silicalite-1(TS-1) as a catalyst, wherein hydrogen peroxide is taken as an oxidant, and Titanium Silicalite-1(TS-1) is taken as the catalyst. A ring-opening reaction of epoxypropare and a solvent can be inhibited effectively by adding a small amount of inorganic alkali buffer solution in a liquid reactant; a buffer agent can be ammonium salt, borate, phosphate or other alkali buffer solvents; and an inorganic salt alkali buffer solution is a mixed solution composed of a weak-base salt and conjugate acid thereof and can be taken from weak base of ammonium salt, borate, phosphate or carbonate, and the corresponding negative ion is Cl<->, Br<->, NO<3-> or SO4<2->, and the positive ion is Li<+>, Na<+> or K<+>. The selectivity of epoxypropare can reach 97.49%, the yield of the epoxypropare can reach 96.56%, and the conversion rate of hydrogen peroxide can reach 99.12%.

Description

technical field [0001] The invention relates to a method for catalyzing the epoxidation reaction of propylene by using titanium-silicon molecular sieve as a catalyst. The method uses hydrogen peroxide as an oxidant and adds a low-concentration alkaline buffer to prepare propylene oxide. The method is characterized in that adding the low-concentration alkaline buffer can effectively improve the selectivity and yield of propylene oxide. Background technique [0002] Propylene oxide (PO) is a very important chemical organic chemical raw material and one of the three major propylene derivatives. At present, the main industrial methods of propylene oxide include chlorohydrin method, indirect oxidation method and direct oxidation method. Among them, the direct oxidation method using hydrogen peroxide as an oxide has high yield, less symbiosis, low energy consumption and environmental friendliness, which is a relatively advanced production process. However, US Patent No. 4,824,97...

Claims

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Application Information

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IPC IPC(8): C07D303/04C07D301/12
Inventor 王志远袁学民王绍伟袁海朋张媛刘文王元平宋辉王志文梁莹钱震张蒙王海国刘俊生张舜光左宜赞曹振岩孙世谦
Owner CHINA TIANCHEN ENG
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