Catalyst for the preparation of ethyl acetate from acetic acid

A technology of ethyl acetate and catalyst, applied in the field of catalyst and catalyst preparation, can solve the problems of low conversion rate, highly expensive catalyst, lack of selectivity and the like

Inactive Publication Date: 2011-12-28
CELANESE INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with the optimal conditions reported therein, significant amounts of by-products including methane, ethane, acetaldehyde and acetone are produced in addition to ethanol
Furthermore, the conversion of acetic acid is generally low and where the conversion is about 5-40% except in a few cases reaching as high as 80%
[0009] From the foregoing it is evident that existing processes do not have the desired selectivity to ethyl acetate and / or ethanol, use highly expensive catalysts, or produce undesirable by-products such as methane and ethane

Method used

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  • Catalyst for the preparation of ethyl acetate from acetic acid
  • Catalyst for the preparation of ethyl acetate from acetic acid
  • Catalyst for the preparation of ethyl acetate from acetic acid

Examples

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preparation example Construction

[0077] Catalyst preparation method

[0078] The catalyst compositions of the first, second and third embodiments of the present invention are preferably formed by metal impregnation of the support and / or modified support, although other methods such as chemical vapor deposition may also be used. Prior to impregnating the metal, it is generally desirable to form a modified support by the step of impregnating the support material with a support modifier, if necessary. In one aspect, the carrier modifier (such as WO 3 or TiO 2 ) or support modifier precursors are added to the support material. For example, an aqueous suspension of the support modifier can be formed by adding the solid support modifier to deionized water followed by adding a colloidal support material thereto. The resulting mixture can be stirred and added to a further support material using, for example, an incipient wetness impregnation technique in which the support modifier is added to a support material ha...

Embodiment 1

[0123] Example 1 - SiO 2 -CaSiO 3 (5)-Pt(3)-Sn(1.8)

[0124] The catalyst was firstly prepared by CaSiO 3 (Aldrich) added to SiO 2 Catalyst support, followed by adding Pt / Sn for preparation. First, CaSiO 3 (≤200 mesh) aqueous suspension by adding 0.52 g of the solid to 13 ml of deionized water, followed by adding 1.0 ml of colloidal SiO 2 (15wt.% solution, NALCO) for preparation. The suspension was stirred at room temperature for 2 h, and then 10.0 g of SiO was added using the incipient wetness impregnation technique 2 Catalyst support (14 / 30 mesh). After standing for 2 hours, the material was evaporated to dryness, then dried overnight at 120° C. under circulating air and calcined at 500° C. for 6 hours. Then all SiO 2 -CaSiO 3 Material for Pt / Sn metal impregnation.

[0125] The catalyst is obtained by first adding Sn(OAc) 2 (tin acetate, Sn(OAc) from Aldrich 2 ) (0.4104 g, 1.73 mmol) was prepared by adding to a vial containing 6.75 ml of 1:1 diluted glacial acet...

Embodiment 2-KA16

[0126] Example 2-KA160-CaSiO 3 (8)-Pt(3)-Sn(1.8)

[0127] The material is prepared by first adding CaSiO 3 Added to KA160 catalyst carrier (SiO 2 -(0.05)Al 2 o 3 , Sud Chemie, 14 / 30 mesh), followed by the addition of Pt / Sn for preparation. First, CaSiO 3 (≤200 mesh) aqueous suspension by adding 0.42 g of the solid to 3.85 ml of deionized water, followed by adding 0.8 ml of colloidal SiO 2 (15wt.% solution, NALCO) for preparation. The suspension was stirred at room temperature for 2 hours and then 5.0 g of KA160 catalyst support (14 / 30 mesh) were added using the incipient wetness impregnation technique. After standing for 2 hours, the material was evaporated to dryness, then dried overnight at 120° C. under circulating air and calcined at 500° C. for 6 hours. Then all KA160-CaSiO 3 Material for Pt / Sn metal impregnation.

[0128] The catalyst is obtained by first adding Sn(OAc) 2 (tin acetate, Sn(OAc) from Aldrich 2 ) (0.2040 g, 0.86 mmol) was added to a vial contain...

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Abstract

Catalysts and processes for making catalysts suitable for use in processes for hydrogenating acetic acid to form of ethyl acetate and mixtures of ethyl acetate and ethanol. In a first embodiment, the catalyst includes a high loading of nickel, palladium or platinum. In a second embodiment, the catalyst comprises a first metal selected from nickel and palladium and a second metal selected from tin and zinc. In a third embodiment, the catalyst comprises one or more metals on a support that has been modified with an acidic support modifier or a redox support modifier.

Description

[0001] priority claim [0002] This application claims priority to US Application No. 12 / 588,727, entitled "Tunable Catalyst Gas Phase Hydrogenation of Carboxylic Acids," filed October 26, 2009, which is hereby incorporated by reference in its entirety. field of invention [0003] The present invention relates generally to catalysts for use in a process for the hydrogenation of acetic acid to form ethyl acetate or a mixture of ethyl acetate and ethanol and a method for preparing the catalysts, which catalysts have high selectivity to ethyl acetate. Background of the invention [0004] There is a long felt need for economically viable catalysts and processes for the conversion of acetic acid to ethyl acetate. Ethyl acetate is an important bulk material for various industrial products and is also used as an industrial solvent in the manufacture of various chemicals. For example, ethyl acetate can be easily converted to ethylene by cracking it, which can then be converted into...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/62B01J23/652B01J23/656B01J23/80B01J23/835B01J23/883C07C29/149
CPCB01J23/6567C07C1/24B01J37/0201B01J21/16B01J23/626B01J23/002B01J2523/00B01J37/08B01J37/0207C07C29/149Y02P20/52C07C11/04C07C31/08B01J2523/27B01J2523/41B01J2523/43B01J2523/828B01J2523/22B01J2523/23B01J2523/69B01J2523/845
Inventor V・J・约翰斯顿L・陈B・F・金米奇J・T・查普曼J・H・津克H・魏纳J・L・波茨R・耶夫蒂奇
Owner CELANESE INT CORP
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