Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Integrated process for the production of vinyl acetate from acetic acid via acetaldehyde

A vinyl acetate and acetic acid technology, applied in the field of integration, can solve problems such as lack of selectivity

Inactive Publication Date: 2011-12-07
CELANESE INT CORP
View PDF25 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] From the foregoing it is clear that acetaldehyde is formed directly from acetic acid in an integrated process, the resulting acetaldehyde is then selectively reacted with acetic anhydride to form ethylidene diacetate, and further converted to VAM and acetic acid by thermal decomposition, existing The process does not possess the required selectivity, thereby making it industrially viable to produce VAM primarily from syngas and / or syngas-based products

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Integrated process for the production of vinyl acetate from acetic acid via acetaldehyde
  • Integrated process for the production of vinyl acetate from acetic acid via acetaldehyde
  • Integrated process for the production of vinyl acetate from acetic acid via acetaldehyde

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The preparation of large pore mordenites has been described, for example, in US Patent 4,018,514 to Plummer and in Mol. Sieves Pap. Conf., 1967, 78, Soc. Chem. Ind. London, by D. DOMINE and J. QUOBEX.

[0048] X zeolites are described, for example, in US Patent 2,882,244 to Milton, and Y zeolites in US Patent 3,130,007 to Breck.

[0049] Various zeolites and zeolite-like materials are known in the field of chemical reaction catalysis. For example, US Patent 3,702,886 to Argauer discloses a class of synthetic zeolites, termed "ZSM-5 zeolites", which are effective in the catalysis of a variety of hydrocarbon conversion processes.

[0050] Zeolites suitable for the process of the invention may be in basic form, in partially or fully acidified form, or in partially dealuminated form.

[0051] Preferably, the zeolite catalyst support in the process of the present invention is in the proton form, referred to as "H-ZSM-5" or "H-mordenite" zeolite, obtained by substituting hyd...

Embodiment A

[0099] Preparation of 1wt.% Ruthenium on Iron Oxide

[0100] Powdered and sieved iron oxide (99 g) with a uniform particle size distribution of about 0.2 mm was dried in an oven at 120° C. under nitrogen overnight and then cooled to room temperature. A solution of ruthenium nitrosylnitrate (Heraeus) (3.14 g) in distilled water (32 ml) was added thereto. The resulting slurry was dried in an oven ramped up to 110°C (>2 hours, 10°C / min). The impregnated catalyst mixture was then calcined at 500°C (6 hours, 1°C / min).

Embodiment B

[0102] Preparation of 3wt.% Ruthenium on Iron Oxide

[0103] The procedure of Example A was essentially repeated except that a solution of ruthenium nitrosylnitrate (Heraeus) (9.42 g) in distilled water (96 ml) and 97 g of iron oxide was used.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
aperture sizeaaaaaaaaaa
Login to View More

Abstract

The present invention provides an economical, multi-step integrated process for the production of vinyl acetate monomer (VAM) from acetic acid in the gas phase. First, acetic acid is selectively hydrogenated over a hydrogenation catalyst composition to form acetaldehyde. Acetaldehyde formed can be converted to ethylene diacetate by reaction with acetic anhydride. The ethylene diacetate formed in the next step is thermally decomposed to form VAM and acetic acid. Alternatively, the acetaldehyde formed in the first step can be selectively reacted with ketene to form VAM. In one embodiment of the present invention, on platinum and iron supported on silica, acetic acid and hydrogen react selectively in the gas phase at a temperature of about 300 °C to form acetaldehyde, which is selected on a platinum-supported catalyst. Hydrogenation to form ethanol and dehydration to form ethylene at a temperature of about 185°C over NAFION catalyst, which is mixed with molecular oxygen and acetic acid and heated on palladium / gold / potassium supported on titania at a temperature of about 150°C to 170°C The catalyst reacts to form VAM.

Description

[0001] priority claim [0002] This application is based on US Provisional Application Serial No. 12 / 317,995 filed December 31, 2009 with the same title, the entire contents of which are hereby incorporated by reference, and priority is hereby claimed. field of invention [0003] The present invention generally relates to an integrated process for the production of vinyl acetate monomer (VAM) from acetic acid via acetaldehyde. More specifically, the present invention relates to an integrated process which first comprises the highly selective hydrogenation of acetic acid to form acetaldehyde using a catalyst comprising a supported metal catalyst, for example, iron, on a suitable catalyst support, Platinum or ruthenium, optionally containing one or more additional hydrogenation metals. In the next second step, the acetaldehyde thus formed is converted into ethylene diacetate by a conversion reaction with acetic anhydride. Ethylene diacetate is then thermally decomposed into VA...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/15C07C67/297C07C67/46C07C67/00C07C67/03C07C45/41C07C47/06
CPCC07C67/00C07C67/46C07C67/297Y02P20/10C07C69/003C07C69/01C07C69/16C07C69/15
Inventor V·J·约翰斯顿J·H·津克L·陈B·F·金米奇J·T·查普曼
Owner CELANESE INT CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com