Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Organics dehydration

However frequently the support material does have a very important function. This is particularly so when the support acts as a (Bronsted) acid or a base. An example is in the catalytic cracking, alkylation, and isomerization of hydrocarbons (Section 5.2.6) The role of the transition metal is in oxidation or hydrogen transfer reactions while the support, for example acidic oxides such as aluminosilicates, act to protonate, rearrange and dehydrate organic species. [Pg.277]

R. Altman was the first to report microscopic investigations of freeze-dried tissue in 1890. Arrhenius, and later Becquerel, proposed that life originated by freeze-dried organisms that arrived on this planet from outer space and then were reconstituted by water. Becquerel calculated that if a dehydrated organism could live for one year at 10 C, then it could live for 70 billion years at -270 °C, the temperature of outer space. [Pg.85]

The controlled formation of polymeric Pu(IV) is important to the sol-gel process for the production of spherical PUO2 particles. Ammonia is added to a nitric acid solution of Pu(IV) to precipitate Pu(OH)4, which is subsequently peptized at 50°C with dilute nitric acid to produce sols of 1 to 3 M Pu with a NOs /Pu ratio of 0.1 to 03. The sols, which remain stable over periods of a few months, are dispersed in a dehydrating organic solvent to form a gel, which is ignited to form spherical particles of PuOj [K2]. [Pg.440]

The same water couples often intervene in non-aqueous media (e.g., when imperfectly dehydrated organic solvents are in question). But in this case thermodynamic data adapted to these media must be used (particular attention must be paid to the reference states chosen forwater). [Pg.59]

Wee et aL (2(X)8) wrote a review on Monhrane Separation Process-Pervaporalion Through Zeolite Monbrane. The focus of this review was on zeolite membrane covering (i) Synthesis of zeolite monbranes (ii) Membrane characterization (iii) PV studies and (iv) Applications in alcohol dehydration, organic-organic separations. [Pg.260]

As can be seen from table 1.8, pervaporation is the only membrane process where a phase transition occurs with the feed being a liquid and the permeate a v un This means that at least the heat of vaporisation of the permeated product has to be supplied. Pervaporation is mainly used to dehydrate organic mixmres. It seems that in the case of membrane contactors the feed (phase 1) can be a gas and phase 2 a liquid. However phase two is the extractant in this case and in fact the gaseous component which has been removed from the feed ans is dissolved in this liquid extractant must be removed as well (e.g. by distillation) which again results in a gaseous phase. [Pg.19]

Sulfurylchloride is used as a chemical for selective chlorination of side chains of aromatics. Sulfurylchloride also sulfonates and dehydrates organic compounds. In the industry it is used as intermediate for the production of organics for colouring agent, for pesticides, for disinfection matters and for pharmaceutical products [13]. Sulfurylchloride is also used at the production of sulfonic acid and for the sulfochlorination of polyethylene. Sulfurylchloride is produced from sulfur dioxide and chloride... [Pg.765]

As already described here, an HA aqueous solution suddenly increases the viscosity at pH = 2.4. When this solution is in contact with either ethanol or an acetone aqueous solution, it dehydrates, hardens, and forms a transparent gel. The modulus of this gel can be adjusted by the concentration and molecular weight of HA, and the concentration and amount of the dehydrating organic solvent. Figure 7 depicts an example of an HA gel that was prepared in a 50 ml beaker. The gel on the left is perfectly... [Pg.479]

As described above, the water vapor permeability in the polyimide is much larger than other gases. This property of the polyimide makes it possible to dehydrate organic compounds with the polyimide membrane module. Compared to a conventional distillation process. [Pg.595]


See other pages where Organics dehydration is mentioned: [Pg.56]    [Pg.335]    [Pg.5]    [Pg.842]    [Pg.335]    [Pg.5]    [Pg.144]    [Pg.115]    [Pg.99]    [Pg.156]    [Pg.147]    [Pg.452]    [Pg.513]    [Pg.442]    [Pg.480]    [Pg.212]    [Pg.470]    [Pg.723]    [Pg.19]    [Pg.27]   
See also in sourсe #XX -- [ Pg.321 ]




SEARCH



Dehydrating agents, organic

Dehydration of organic liquids

Dehydration of organics

Dehydration organic compounds

Dehydration-Activation of Inorganic and Organic Salts

Organic dehydration, with zeolite membranes

Pervaporation dehydration of organics

© 2024 chempedia.info