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Process And Reactor Systems For Converting Sugars And Sugar Alcohols

A hydrogenation catalyst and pressure technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of catalyst performance degradation, time-consuming, high cost, etc.

Inactive Publication Date: 2012-11-28
VIRENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As these deposits accumulate, access to the catalytic sites on the surface becomes restricted and the performance of the catalyst decreases, resulting in lower conversion and polyol product yields
Frequent replacement of hydrogenation catalysts is time-consuming and costly, especially for on-line continuous processes

Method used

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  • Process And Reactor Systems For Converting Sugars And Sugar Alcohols
  • Process And Reactor Systems For Converting Sugars And Sugar Alcohols
  • Process And Reactor Systems For Converting Sugars And Sugar Alcohols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Hydrogenation catalyst regeneration proceeds as follows. The feed was initially switched from sucrose to deionized water to flush soluble components out of the system. The temperature within the catalyst bed was then reduced to less than about 100°C by turning off the electric heater in contact with the reactor wall. During cooling, hydrogen was circulated through the system at a gas hourly space velocity (GHSV) of 500 standard gas volume / catalyst volume / hour using a recycle compressor. A pressure of 1200 psig was maintained on the system. After flushing with more than four reactor volumes of water, the water flow was stopped, the recycle compressor was stopped, and the system was depressurized to atmospheric pressure.

[0084] Hydrogen flow through the catalyst bed is maintained during depressurization and further cooling to remove adsorbed water from the catalyst. The system pressure was then raised to 1000 psig using hydrogen, and the reactor temperature was raise...

Embodiment 2

[0086] The procedure of Example 1 was followed except that after maintaining the temperature at 340°C for 8 hours, the temperature was increased to 400°C to determine if additional carbon was removed at the higher temperature. Less than 0.1% of additional carbon by initial catalyst weight was removed between 340°C and 400°C. This shows that regeneration is substantially complete at 340°C.

Embodiment 3

[0088] The procedure of Example 1 was followed except that the temperature was ramped to 400°C and the pressure was maintained at 700 psig during regeneration. The yields of polyols (sorbitol + mannitol) from sucrose before and after regeneration are shown in Figure 6 . Under the same operating conditions, this procedure resulted in a 26% increase in the conversion of the regenerated catalyst compared to that of the deactivated catalyst.

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Abstract

Processes and reactor systems are provided for the conversion of sugars to sugar alcohols using a hydrogenation catalyst, which includes apparatus and method for in-line regeneration of the hydrogenation catalyst to remove carbonaceous deposits.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 221,942, filed June 30, 2009. [0003] Statement Regarding Federally Sponsored Research or Development [0004] Not applicable. Background of the invention [0005] Aqueous phase reforming (APR) is a catalytic reforming process that produces hydrogen and hydrocarbons from oxygenates derived from a wide range of biomass, including glycerol, sugars, sugar alcohols, and the like. Various APR methods and techniques are described in U.S. Patent Nos. 6,699,457; 6,964,757; 6,964,758; and 7,618,612 (all to Cortright et al., and entitled "Low-Temperature Hydrogen Production from Oxygenated Hydrocarbon" ); U.S. Patent No. 6,953,873 (by Cortright et al., and titled "Low-Temperature Hydrocarbon Production from Oxygenated Hydrocarbon (from low-temperature hydrocarbon generation of oxygenated hydrocarbons)"); U.S. Patent Application Serial No. 2008 / 0025903 (by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/10C07C29/141C07C31/26
CPCC07C29/132B01J38/10Y02P20/584C07C31/26C07C29/141
Inventor 保罗·乔治·布鲁麦伊丽莎白·M·伍兹迈克尔·J·沃纳亚伦·詹姆斯·伊姆里兰迪·D·寇特莱特
Owner VIRENT