Preparation method of lithium phosphate catalysts

A catalyst and lithium phosphate technology, applied in the direction of catalyst activation/preparation, isomerization preparation, chemical instruments and methods, etc., can solve problems such as cost increase

Active Publication Date: 2006-12-13
LYONDELL CHEM TECH LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More ideally, catalyst activity or productivity would be increased without incurring an increase in cost

Method used

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  • Preparation method of lithium phosphate catalysts
  • Preparation method of lithium phosphate catalysts

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Lithium Phosphate Catalyst Containing Sodium and Boron

[0032] Catalyst preparation

[0033] In a first flask, 43.5 g of sodium phosphate dodecahydrate and 13 g of boric acid were dissolved in 150 ml of 70°C distilled water. In a second flask, 15.8 g of lithium hydroxide monohydrate and 4.6 g of sodium hydroxide were dissolved in 125 ml of 70°C distilled water. The solution from the first flask was then added to the second flask at 70°C under rapid stirring over a period of 10 minutes. The crude lithium phosphate white precipitate was collected by filtration. The filter cake was broken up by hand and stirred in a 2 liter flask with 1.6 liters of distilled water for 1.5 hours at 85-90°C. The white powder was collected by filtration, and then dried overnight in an oven at 130°C. The resulting catalyst contains about 0.1-0.3 wt% sodium and 0.3-0.5 wt% boron.

[0034] Isomerization of Propylene Oxide

[0035] The isomerization reaction was carried out in a g...

Embodiment 2

[0037] Lithium Phosphate Catalyst Containing Sodium and Boron

[0038] The overall procedure of Example 1 was repeated, except that 43.5 g of sodium phosphate dodecahydrate and 20 g of sodium tetraborate decahydrate were dissolved in the first flask. The resulting lithium phosphate catalyst contains about 0.1-0.3 wt% sodium and 0.3-0.6 wt% boron. The conversion rate of propylene oxide is in the range of 54.0%-58.7%, and the selectivity of allyl alcohol is in the range of 92.8%-93.0%.

Embodiment 7

[0052] Low Temperature Isomerization Using Sodium and Boron-Containing Lithium Phosphate Catalysts

[0053] The overall steps of Example 1 were repeated, except that the isomerization reaction was carried out at 253°C. The conversion of propylene oxide ranged from 39.9% to 42.5% and the selectivity to allyl alcohol ranged from 93.6% to 94%.

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Abstract

A new method for preparing lithium phosphate catalysts is disclosed. The method comprises precipitating a lithium phosphate from a mixture comprising a first aqueous solution which contains lithium and sodium ions and a second aqueous solution which contains phosphate and borate ions. The resultant lithium phosphate catalyst has increased activity and selectivity in the isomerization of an alkylene oxide to the corresponding allylic alcohol.

Description

field of invention [0001] The present invention relates to a lithium phosphate catalyst, more specifically, the present invention relates to a highly active lithium phosphate catalyst used for the isomerization of alkylene oxide into allyl alcohol. Background of the invention [0002] Lithium phosphate catalysts are industrially used in the isomerization of propylene oxide to allyl alcohol. This catalyst was first disclosed in US Patent 2426264. The preparation method of the catalyst comprises precipitating crude lithium phosphate from a mixture of an aqueous solution containing phosphate ions and an aqueous solution containing lithium ions, and then washing the crude precipitate with water and drying it into a catalyst powder. [0003] Several methods are known to improve lithium phosphate catalysts. For example, US Patent No. 2,986,585 proposes the additional use of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide in the lithium phosphate precipit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18B01J27/16B01J23/04B01J37/03C07C29/56
CPCB01J27/1806B01J23/04B01J27/16B01J27/18B01J37/031B01J37/06C07C29/56C07C33/03B01J27/14
Inventor W·P-S·舒姆
Owner LYONDELL CHEM TECH LP
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