Catalysts and methods for alcohol dehydration

A technology for dehydration catalysts and compounds, applied in chemical instruments and methods, catalyst regeneration/reactivation, physical/chemical process catalysts, etc., can solve problems such as expensive, difficult to handle, and rapid deactivation of catalysts

Inactive Publication Date: 2016-01-20
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of thorium oxide is its radioactive nature, which makes its handling difficult and potentially expensive
Furthermore, in recent years, the supply of thorium oxide has been largely unavailable worldwide, putting incumbent DPO manufacturers using this technology in crisis
In addition, other catalysts used for the gas phase dehydration of phenol, such as zeolite catalysts, titania, zirconia, and tungsten oxides, generally suffer from lower activity, significantly higher levels of impurities, and rapid catalyst deactivation

Method used

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  • Catalysts and methods for alcohol dehydration
  • Catalysts and methods for alcohol dehydration
  • Catalysts and methods for alcohol dehydration

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation of the dehydration catalyst can be performed such that it provides a BET surface area high enough to enable commercially viable product yields. Synthetic methods known to those skilled in the art can be performed to maximize the active surface area for selective production of the desired product. These methods include, but are not limited to, sol-gel preparation, flame pyrolysis, colloidal routes, molding methods, and grinding. Additionally, compounds such as, but not limited to, sacrificial porogens, structure directing compounds, stripping agents, and / or pillaring agents may be added to increase surface area. The BET surface area of ​​the dehydration catalyst is preferably greater than 5m 2 / g, more preferably greater than 50m 2 / g, and more preferably greater than 150m 2 / g.

[0026] The dehydration catalyst in the reaction vessel may optionally contain a binder and / or matrix material other than the oxides of rare earth elements. Non-limiting exa...

example 1

[0058] Synthesis of Lanthanum Oxychloride by Thermal Decomposition of LaCl 3 ·7H 2 O execute. A sample (about 10 g) of the powdered precursor was calcined in air in a static calcination furnace with the following temperature profile: 1.41 °C / min ramp to 550 °C, 3 hour dwell at 550 °C, cooling to room temperature. The elemental composition of the catalyst was analyzed by X-ray fluorescence spectroscopy (XRF) to be 17.23 wt.% chlorine, 69.63 wt.% lanthanum and 13.14 wt.% oxygen (remainder). Therefore, the elemental composition of the catalyst is La 1.00 o 1.64 Cl 0.97 . The specific surface area (BET) of the catalyst sample was measured to be 6.2m 2 / g and its pore volume is 0.013cm 3 / g. XRD data showed the presence of a lanthanum oxychloride phase.

example 2

[0060] The lanthanum oxychloride catalyst from Example 1 was used for the dehydration of phenol. The powder is pressed and sieved to obtain particles with a diameter of 0.60 mm to 0.85 mm. Particles were loaded into an electrically heated stainless steel reactor tube and heated to reaction temperature with nitrogen gas flowing through the tube. After reaching the reaction temperature, gas phase phenol was passed through the reactor tube. The conversion of phenol was performed at 1 weight hourly space velocity (WHSV=g phenol / g catalyst-hour) and at 500°C. Test conditions and results are shown in Table 1.

[0061] Table 1

[0062]

[0063]

[0064] OPP: o-phenylphenol. DBF: Dibenzofuran. O-BIPPE: o-biphenylphenyl ether. M-BIPPE: m-biphenylphenyl ether. P-BIPPE: p-biphenylphenyl ether. PhOH: phenol. N2: Nitrogen. ToS: Reaction time (defined as ToS = 0 hours at the start of phenol flow).

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Abstract

Provided is a method for preparing a diaryl ether compound through the dehydration of an aromatic alcohol compound in the presence of a halogenated rare earth element oxide catalyst, wherein the used dehydration catalyst may be regenerated by a halogenation step. The rare earth element oxide is an oxide of a light rare earth element, an oxide of a medium rare earth element, an oxide of a heavy rare earth element, an oxide of yttrium, or a mixtures of two or more thereof.

Description

technical field [0001] The present invention generally relates to catalysts and methods for the dehydration of aromatic alcohol compounds to ethers. More specifically, the present invention uses halogenated rare earth element oxide catalysts for the dehydration of aromatic alcohol compounds to diaryl ethers. Background technique [0002] Diaryl ethers are an important class of industrial materials. Diphenyl ether (DPO), for example, has many uses, most notably as a major component of eutectic mixtures of DPO and biphenyl, the standard heat transfer fluid for the concentrated solar power (CSP) industry. With the current surge in CSPs that has occurred, there has been a tight supply of DPOs in general and questions surrounding the sustainability of the technology. [0003] Diaryl ethers are currently produced commercially via two main routes: the reaction of haloaryl compounds with aryl alcohols; or the gas-phase dehydration of aryl alcohols. The first route, such as the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/125B01J38/44B01J38/42B01J35/10C07C41/09C09K5/10B01J27/08B01J27/06
CPCB01J38/42B01J38/44B01J27/06B01J27/08B01J27/125B01J35/1014C09K5/10C07C41/58Y02P20/584C07C41/09C07C43/275B01J27/32
Inventor P·R·艾洛维D·G·巴顿A·霍耶茨基B·A·克洛斯D·W·朱厄尔A·S·斯拉克B·D·霍克
Owner DOW GLOBAL TECH LLC
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