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Converting sugars to sugar alcohols by aqueous phase .

@article{osti_921798, title = {Converting sugars to sugar alcohols by aqueous phase catalytic hydrogenation}, author = {Elliott, Douglas C and Werpy, Todd A and Wang, Yong and Frye, Jr., John G.}, abstractNote = {The present invention provides a method of converting sugars to their corresponding sugar alcohols by catalytic hydrogenation in the aqueous phase.

Solvent effects in catalytic hydrogenation - ScienceDirect

Chemical Engineering Science, Vol. 41, No. 7, pp. 1765 1770, 1986. Printed in Great Britain. 0009 2509/86 53.00 / 0.00 Pergamon Journals Ltd. SOLVENT EFFECTS IN CATALYTIC HYDROGENATION R. A. RAJADHYAKSHAt and S. L. KARWA Department of Chemical Technology, University of Bombay, Matunga, Bombay 400019, India (Received 27 November 1984) Abstract Solvents are known to have .

Direct Hydrogenation of Amides to Alcohols and Amines .

The selective, direct hydrogenation of amides to the corresponding alcohols and amines with cleavage of the C−N bond was discovered. The expected products of C−O cleavage are not formed (except as traces in the case of anilides). The reaction proceeds under mild pressure and neutral, homogeneous conditions using a dearomatized, bipyridyl-based PNN Ru(II) pincer complex as a catalyst.

Asymmetric Hydrogenation of Allylic Alcohols via Dynamic .

Jun 14, 2018 · However, the complex mixture obtained in the hydrogenation of some acid sensitive allylic alcohols made it difficult to interpret the results. The project was suspended for a short time but work began again in late 2011 with the key breakthrough in the summer of 2012 when we repeated the experiment using the optically pure (2R)-1 and (2S)-1 as .

Sugar Hydrogenation Over Supported Ru/C—Kinetics and .

May 25, 2010 · The hydrogenation kinetics of some natural sugars to corresponding sugar alcohols in aqueous solutions was investigated on Ru/C catalysts in a pressurized slurry reactor. The kinetic data were well described by a Langmuir-Hinshelwood model assuming that the hydrogenation step on the catalyst surface is rate determining.

Production of C5/C6 Sugar Alcohols by Hydrolytic .

Producing chemicals from lignocellulosic biomass is important in view of the huge availability of biomass and positive environmental significance by reducing carbon emission due to fast carbon cycle during biomass growth and applications. Here, we prepared zirconium based solid acids for hydrolytic hydrogenation of raw lignocelluloses to coproduce C5/C6 sugar alcohols (the important platform .

Polyol - Wikipedia

Sugar alcohols. Sugar alcohols, a class of polyols, are commonly obtained by hydrogenation of sugars. They have the formula (CHOH) n H 2, where n = 4–6. Sugar alcohols are added to foods because of their lower caloric content than sugars; however, they are also, in general, less sweet, and are often combined with high-intensity sweeteners.They are also added to chewing gum because they are .

Method for hydrogenation of acetone to isopropanol

Reactor of the first stage can be circulation reaction, and at the second stage - tube reactor. For hydrogenation reaction acetone containing 1.0 wt.-% of water, not less, is used. Invention provides carrying out the process with high selectivity to yield isopropanol containing impurities in the concentration less 300 mole fr., preferably, less .

(PDF) Sugar Alcohols: Chemistry, Production, Health .

The sugar alcohols commonly found in foods are sorbitol, mannitol, xylitol, erythritol, isomalt, and hydrogenated starch hydrolysates. Sugar alcohols come from plant products such as fruits and .

Continuous Hydrogenation of L‐Arabinose and D‐Galactose in .

Aug 17, 2017 · The continuous hydrogenation of a mixture of L‐arabinose and D‐galactose over a Ru/C catalyst was investigated in a miniaturized packed‐bed reactor.The reaction is one important step of the transformation of the naturally occurring hemicellulose arabinogalactan into valuable sugar alcohols.

Monolith loop reactor for hydrogenation of glucose .

1. Introduction. The hydrogenation of glucose (Eq. ) is a heterogeneously catalyzed reaction for producing the sugar alcohol sorbitol, which is an important industrial product with a world capacity of more than 1 Mt/a.

Sugar Alcohol - an overview | ScienceDirect Topics

Feb 12, 1999 · Polyols are reduced-calorie, sugar-free bulk sweeteners. They are sugar alcohols or polyhydric alcohols that are derived from saccharides by the reduction of the aldehyde or ketone group to an alcohol group through chemical or biochemical process. A majority of polyols are naturally occurring substances. Erythritol, sorbitol, xylitol and mannitol can be found in plants (Table 8.1) .

Sugar Hydrogenation – HHT Services

Home / Chemical Reactor Technology / Hydrogenation Loop Reactor Types / Sugar Hydrogenation The technology supply for the manufacturing of hydrogenated sugars to manufacture sorbitol, xylitol, mannitol or lactitol comprises the supply for the Loop Reactor, catalyst filtration, catalyst recycling (up to 200 times) and a special pH control system.

What is Hydrogenation?

Hydrogenation is a chemical reaction between molecular hydrogen and other compounds and elements. Hydrogenation is used in many applications such as the food industry, petrochemical industry and the pharmaceutical manufacturing industry. . the dextrose is then hydrogenated to create sorbitol or sugar alcohol. In the Petroleum Industry .

Hydrogenated starch hydrolysates - Wikipedia

Hydrogenated starch hydrolysates (HSHs) are mixtures of several sugar alcohols (a type of sugar substitute). Hydrogenated starch hydrolysates were developed by the Swedish company Lyckeby Starch in the 1960s. The HSH family of polyols is an approved food ingredient in Canada, Japan, and Australia.

What is Hydrogenation?

Hydrogenation is a chemical reaction between molecular hydrogen and other compounds and elements. Hydrogenation is used in many applications such as the food industry, petrochemical industry and the pharmaceutical manufacturing industry. . the dextrose is then hydrogenated to create sorbitol or sugar alcohol. In the Petroleum Industry .

Hydrogenation of lactose for the production of lactitol .

Dec 10, 2018 · Lactitol is the primary sugar alcohol derived from lactose through a set of chemical reactions known as catalytic hydrogenation. Reaction products are strongly dependent on the reaction conditions and catalyst type. The purpose of this review is to examine the production of lactitol through hydrogenation of lactose. Technological aspects of .

Synthesis of sugar alcohols by hydrolytic hydrogenation of .

Cellulose is converted into sorbitol and related sugar compounds over water-tolerant and durable carbon-supported Pt catalysts under aqueous hydrogenation conditions. Pre-treatment of cellulose with ball-milling effectively reduces the crystallinity and particle .

Sugar hydrogenation in continuous reactors: From catalyst .

The simulations suggested the use of small catalyst particles or structured catalysts in continuous hydrogenation of the sugars to sugar alcohols. Continuous hydrogenation of l -arabinose was carried out in a laboratory-scale fixed bed reactor with ruthenium catalysts on three different supports (active carbon clothes, carbon nanotubes on .

Sugar Alcohols: Good or Bad?

Sep 19, 2018 · Sugar alcohols have a number of other potential benefits worth highlighting: Prebiotic: Sugar alcohols may feed the friendly bacteria in your gut, having a prebiotic effect like dietary fiber (13 .

Direct Hydrogenation of Amides to Alcohols and Amines .

The selective, direct hydrogenation of amides to the corresponding alcohols and amines with cleavage of the C−N bond was discovered. The expected products of C−O cleavage are not formed (except as traces in the case of anilides). The reaction proceeds under mild pressure and neutral, homogeneous conditions using a dearomatized, bipyridyl-based PNN Ru(II) pincer complex as a catalyst.

Catalytic hydrogenation of alginic acid into sugar .

The formation of C4 and C5 sugar alcohols from sorbitol follows terminal C-C cleavage by decarbonylation or internal C-C cleavage by retro-aldol reaction. The proposed mechanism of C-C scission involves a metallic site for dehydrogenation of sorbitol and hydrogenation of .

Hydrogen Gas-Mediated Deoxydehydration/Hydrogenation .

DODH/hydrogenation sequence (entry 8). Spurred on by these promising results, conditions that promoted the ring-opening reaction of 3-Et were explored in order toimprove the yield of the desired diethyladipate. During the synthesis of various potential substrates, we observed choice ofesterifying alcohol had asignificantimpact onthe equilibrium

Secondary hydrogenation device for sugar alcohol .

The secondary hydrogenation device for sugar alcohol structurally comprises a primary reaction kettle, a secondary reaction kettle and a sedimentation tank, wherein the liquid outlet of the primary reaction kettle is communicated with the liquid inlet of a hydrogenation liquid intermediate tank through a pipeline after being connected in .

Asymmetric Hydrogenation of Allylic Alcohols via Dynamic .

Jun 14, 2018 · However, the complex mixture obtained in the hydrogenation of some acid sensitive allylic alcohols made it difficult to interpret the results. The project was suspended for a short time but work began again in late 2011 with the key breakthrough in the summer of 2012 when we repeated the experiment using the optically pure (2R)-1 and (2S)-1 as .

Sugar Hydrogenation Over Supported Ru/C—Kinetics and .

May 25, 2010 · The hydrogenation kinetics of some natural sugars to corresponding sugar alcohols in aqueous solutions was investigated on Ru/C catalysts in a pressurized slurry reactor. The kinetic data were well described by a Langmuir-Hinshelwood model assuming that the hydrogenation step on the catalyst surface is rate determining. The density, viscosity and hydrogen solubility of the reacting .

ORGANIC CHEMISTRY Anti-Markovnikovalcoholsvia epoxide .

Mn powder, have made the reaction catalytic in Ti. The Norton group has shown that CpCr(CO) 3H 3, which has a bond dissociation energy of only 62 kcal mol−1, can transfer H† to organic radi-cals (36–40). Compound3 should thus react to form Ti(IV) alkoxides 5 by H† transfer to 2. The regeneration of 3, by the hydrogenation of CpCr(CO)

Hydrogenation - Wikipedia

Sugar alcohols are sweeteners that have about half the calories of regular sugar.They occur naturally in certain fruits and vegetables, but some are man-made and are added to processed foods .

Hydrogenation of Glucose to Sorbitol over Nickel and .

The hydrolytic hydrogenation of these sugar polymers produces sugar alcohols, which are used as low-calorie and low-cariogenic sweeteners and sugar substitutes for diabetics, as humectants in .

Production of C5/C6 Sugar Alcohols by Hydrolytic .

Producing chemicals from lignocellulosic biomass is important in view of the huge availability of biomass and positive environmental significance by reducing carbon emission due to fast carbon cycle during biomass growth and applications. Here, we prepared zirconium based solid acids for hydrolytic hydrogenation of raw lignocelluloses to coproduce C5/C6 sugar alcohols (the important platform .