WO2013159161A1 - Catalisadores à base de nióbio para a conversão de glicerol a éteres - Google Patents
Catalisadores à base de nióbio para a conversão de glicerol a éteres Download PDFInfo
- Publication number
- WO2013159161A1 WO2013159161A1 PCT/BR2012/000115 BR2012000115W WO2013159161A1 WO 2013159161 A1 WO2013159161 A1 WO 2013159161A1 BR 2012000115 W BR2012000115 W BR 2012000115W WO 2013159161 A1 WO2013159161 A1 WO 2013159161A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glycerol
- niobium
- conversion
- ethers
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/12—Oxidising
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/09—Preparation of ethers by dehydration of compounds containing hydroxy groups
Definitions
- the present invention is directed to the synthesis of peroxoniobate-based catalysts used for commercial glycerine condensation from biodiesel synthesis to carbon chain ethers ranging from C5-C9.
- the reaction of obtaining glycerine ethers involves a reaction using a glycerol-water mixture, the concentration of glycerol in this mixture varying from 10 to 100% by volume, in temperatures ranging from 100 to 250 ° C.
- the products obtained may be used in various applications, mainly as fuel additives.
- US 5387720 discloses a process for the preparation of acrolein and US 7790934 discloses tungsten-based catalysts for dehydrating glycerol at temperatures between 180 and 350 ° C and pressures between 0.1 and 200 atm.
- US 7910771 discloses the obtainment of gas phase acrylic acid from glycerol using Mo, V, W, Re, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sn, Te, Sb, Bi, Pt, Pd, Ru and Rh, at temperatures between 250 and 350 ° C.
- US Patent Application 2007/0232817 - discloses a process for obtaining biodiesel by esterification of fatty acids employing niobic acid (Nb 2 0 5 .nH 2 0) as a catalyst in the proportion of 1 to 2% by weight in the reaction medium. at a temperature in the range 80 - 200 ° C.
- Carboxylic acid fatty acids containing from 6 to 24 carbon atoms from refining vegetable oils are used, the catalyst is subjected to a calcination pretreatment to activate its acid sites.
- Methanol or ethanol are used as esterifying agents.
- the patent application US 2008/0295393 describes a transesterification process for producing fatty acid esters from vegetable oils and fats, using solid catalyst based on Nb 2 0 5 supported on alumina. The process is conducted at a temperature in the range of 65 to 290 ° C for a time of 1 to 8h, and the catalyzed molar ratio in the range of 1: 3 to 1: 30.
- BRPI0618899 (A2) describes a process for obtaining ether from the reaction of glycerine with epoxides for use as surfactants.
- glycerol is one of the major technological barriers to the production of high amounts of biodiesel in plants.
- the patents disclosed so far are economically unfeasible, as in most cases they use high temperatures and high pressure, the others use homogeneous catalysts that are difficult to remove after the process, and others report the use of microorganisms that by In turn, it requires strict pH and temperature control of the reaction medium.
- the process of the present invention is within this context and is intended to solve problems regarding catalyst efficiency, process operating costs, ease of product separation and catalyst reuse, among other advantages.
- the present invention deals with a process of producing glycerol derivatives, mainly di- and tri-glycerol, from commercial glycerin, a byproduct of biodiesel synthesis.
- glycerol derivatives mainly di- and tri-glycerol
- niobium-based heterogeneous catalysts were developed, which were later modified by the formation of peroxide groups on the catalyst surface. This modification of the catalyst directs the reaction to further glycerol condensation with the formation of molecules that have the potential to be used as fuel bioadditives.
- the conversion of glycerine to ethers achieved was approximately 96%.
- the invention relates to the use of modified catalysts to convert glycerol to chain ethers containing C5 -C9 carbon numbers.
- ethers of suitable carbon chain size which may range from 6 to 9 carbon atoms, which favor their use in the formulation of bioadditives, such as metal sequestration chelators in aqueous solutions or in obtaining nitrated ethers, used as additives for increasing the cetane number in diesel.
- the present invention proposes new niobium-based catalysts, which are treated and have surface characteristics that give them greater catalytic activity in the glycerol-ether conversion reactions.
- the catalysts of the present invention are synthesized by following these steps:
- the process of the present invention is innovative and has features that make it highly advantageous, namely:
- (i) uses mild temperature and pressure conditions, and heterogeneous catalyst based on niobium compounds: synthetic and modified niobium oxide by treatment with highly reactive and selective hydrogen peroxide;
- the peroxo niobate catalyst may be regenerated and reused with a simple treatment with 2.8% (v / v) aqueous hydrogen peroxide solution which disregards the catalyst surface peroxide groups; and (v) the reaction is performed without the use of organic solvents, which makes the process simpler.
- Niobian catalyst is synthesized by slowly adding 30 mL of aqueous NaOH solution (1.0 mol / l) over 15 g of niobium ammonium acetate (NH 4 [NbO (C204) 2 (H 2 O)] (H 2 O) n) under constant stirring at a temperature of 70 ° C. The resulting white solid (niobium oxide) is then washed with distilled water until the wash water is neutral pH and oven dried at 70 ° C for 12 hours.
- the synthesized material as described above is called synthetic niobium oxide.
- Modification of the synthetic niobium oxide obtained for generation of the peroxoniobate phase is conducted using a 2.8% (v / v) aqueous H 2 O 2 solution. Then the yellowish-colored solid obtained (peroxoniobate) is washed with distilled water until the wash water is neutral pH and oven dried for 12h at 70 ° C.
- Synthetic niobium oxide after treatment with hydrogen peroxide solution was called peroxoniobate.
- niobium salts may be employed as feedstock, as well as different concentrations of aqueous hydrogen peroxide (H 2 O 2 ) solution.
- the modified peroxoniobate catalyst has greater selectivity for glycerol ether production with a carbon chain containing between six and nine carbons.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR112013025441A BR112013025441A2 (pt) | 2012-04-26 | 2012-04-26 | catalisadores à base de nióbio para a conversão de glicerol a éteres |
| PCT/BR2012/000115 WO2013159161A1 (pt) | 2012-04-26 | 2012-04-26 | Catalisadores à base de nióbio para a conversão de glicerol a éteres |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/BR2012/000115 WO2013159161A1 (pt) | 2012-04-26 | 2012-04-26 | Catalisadores à base de nióbio para a conversão de glicerol a éteres |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2013159161A1 true WO2013159161A1 (pt) | 2013-10-31 |
Family
ID=49482039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2012/000115 Ceased WO2013159161A1 (pt) | 2012-04-26 | 2012-04-26 | Catalisadores à base de nióbio para a conversão de glicerol a éteres |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BR112013025441A2 (pt) |
| WO (1) | WO2013159161A1 (pt) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0705991A2 (pt) * | 2007-10-25 | 2009-06-23 | Univ Fed Lavras | produção e uso de compostos de nióbio reativos em processos catalìticos pelo tratamento com peróxidos |
| BRPI0904580A2 (pt) * | 2009-09-08 | 2011-05-17 | Univ Fed Lavras | obtenção de acroleìna a partir de glicerol residual da produção de biodiesel |
-
2012
- 2012-04-26 BR BR112013025441A patent/BR112013025441A2/pt not_active Application Discontinuation
- 2012-04-26 WO PCT/BR2012/000115 patent/WO2013159161A1/pt not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BRPI0705991A2 (pt) * | 2007-10-25 | 2009-06-23 | Univ Fed Lavras | produção e uso de compostos de nióbio reativos em processos catalìticos pelo tratamento com peróxidos |
| BRPI0904580A2 (pt) * | 2009-09-08 | 2011-05-17 | Univ Fed Lavras | obtenção de acroleìna a partir de glicerol residual da produção de biodiesel |
Non-Patent Citations (2)
| Title |
|---|
| ESTEVES, A. ET AL.: "New Materials based on modified synthetic Nb2Os as photocatalyst for oxidation of,organic contaminants", CATALYSIS COMMUNICATIONS, vol. 10, 2008, pages 330 - 332, XP025655634, DOI: doi:10.1016/j.catcom.2008.09.012 * |
| OLIVEIRA, L. C. A. ET AL.: "Modified niobia as a bifunctional catalyst for simultaneous dehydration and oxidation of glycerol", APPLIED CATALYSIS B: ENVIROMENTAL, vol. 117-118, 6 January 2012 (2012-01-06), pages 29 - 35. * |
Also Published As
| Publication number | Publication date |
|---|---|
| BR112013025441A2 (pt) | 2019-12-03 |
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