Ethylhexanol From Propylene and Synthesis Gas - Scribd
2-ETHYLHEXANOL | Alcohols | Organic synthesis | …
Provide A Synthesis Of 2-ethylhexanol Using ..
SUBSTANCE: invention relates to a method for synthesis of 2-ethylhexanol that is used in manufacturing plasticizing agents of high quality, solvents and lubricating materials. Method involves the hydrogenation reaction of 2-ethylhexenal at increased temperature and pressure in regiment of incomplete conversion of 2-ethylhexenal and recycle of nonconverted 2-ethylhexenal to the hydrogenation step and isolation of the end 2-ethylhexanol by rectification and hydropurification on nickel-containing catalyst at increased temperature and pressure. Concentrate of 2-ethylhexenal is used a raw for hydrogenation prepared by condensation of n-butyric aldehyde, and the hydrogenation process is carried out in liquid phase under pressure 200-300 atm, temperature 100-2200C and using nickel-containing catalyst. Isolation of crude 2-ethylhexanol from hydrogenizate containing, except for 2-ethylhexanol, also C8-aldehydes, C8-unsaturated alcohols, C12-acetals, C12-ethers and esters and other oxygen-containing impurities with boiling point near that of 2-ethylhexanol is carried out by rectification under vacuum in four columns: in the first column light impurities are isolated, in the second column unreacted C8-aldehydes are isolated, in the third column crude 2-ethylhexanol is isolated, and in the fourth column 2-ethylhexanol is extracted additionally from the third column vat residue. As a recycle to the hydrogenation mixture of fraction of unreacted C8-aldehydes from upper part of column and 2-ethylhexanol taken in the mass ratio of sum of C8-aldehydes to 2-ethylhexanol in the range = (0.03-0.5):1, and in the mass ratio fresh raw : recycle = (0.3-3):1 is fed to the hydrogenation step. Isolation of recycle fraction of C8-aldehydes in the second column is carried out at the pressure value on upper part of column 50-200 mm of mercury column, temperature difference between 12-th theoretic plate from upper and upper part of column 15-350C with consumption wherein potential removal of 2-ethylhexanol in column distillate is 1-5 wt.-%. Method provides synthesis of 2-ethylhexanol of high quality and high yield and to prolong working life of the hydrogenation catalyst.
SUBSTANCE: invention relates to a method for synthesis of 2-ethylhexanol by hydrogenating 2-ethylhexenal in liquid phase on an industrial aluminium-nickel-titanium catalyst at temperature of 160-200°C, pressure of up to 30 MPa and bulk speed of feeding material of 0.3-0.5 h-1. The process is carried out in two reactors, in each of which 2-ethylhexanal is independently fed with the same bulk speed and a hydrogenation product comes out of each, and after separation from the hydrogenation product after the first reactor circulation hydrogen is fed into the second reactor while simultaneously replenishing it with fresh hydrogen in an amount which ensures the same pressure as hydrogen pressure at the input of the first reactor.
2-Ethylhexanol (2-EH) Production and Manufacturing Process
Almost all 2-ethylhexanol manufactured is used as a precursor for the synthesis of the diester bis(2-ethylhexyl) phthalate (DEHP), a plasticizer. since it is a fatty alcohol, its esters tend to have emollient properties. E.g., the sunscreen octocrylene contains a 2-ethylhexyl ester for this purpose.
The invention relates to the field of chemistry and petrochemistry, namely a process for the production of 2-ethylhexanol by hydrogenation of 2-ethylhexenal. The original product - 2-ethylhexenal in the industry is produced by crotonic condensation nmassage aldehyde in the presence of aqueous alkali. The obtained 2-ethylhexenal then subjected to catalytic hydrogenation in 2-ethylhexanol. (Hankin V.Y., H.S. Gurevich, Technology oxosynthesis. - L.: Chemistry, 1984, s). A method of obtaining 2-ethylhexanol by hydrogenation of 2-ethylhexanal to two stages (DE, patent 3932331,1991 g). The first stage of an unsaturated aldehyde hydronaut on copper-containing catalyst in the vapor phase at a temperature of 100-200°C and hydrogen pressure of 0.05-2.0 MPa in a tubular reactor, at the second stage hydrogenation product is subjected to further hydrogenation in the liquid phase Nickel-containing catalyst at a temperature of 60-160°C and a hydrogen pressure of 0.1 to 25 MPa in the adiabatic reactor at a flow rate of 2-ethylhexenal a total of two levels of 0.5-0.7 h-1. Conversion of the original unsaturated aldehyde reaches of 99.5%.
2-Ethylhexanol | C8H18O | ChemSpider
The synthesis and basic properties of 2-ethylhexanol based innovative nonionic surfactants are described in this paper. 2-Ethylhexanol as an available and relatively inexpensive raw material was used as the hydrophobe source modified by propoxylation and followed by polyethoxylation. As the result, six series of 2-ethylhexyl alcohol polyalkoxylates (EHP m E n ) were obtained with three steps of propoxylation, each followed by polyethoxylation and two series only with polyethoxylation (EHE n ). Two different catalysts were used, a dimetalcyanide and KOH. Values of average conversion rates and chemical content of the obtained products (GC, TG and GPC techniques) were compared. The influence of the applied catalyst and polyaddition degree on the homologue distribution, reactant conversion and amount of byproducts is discussed. The basic physicochemical parameters including refractive index, solubility in polar media, foaming properties and wettability were investigated and compared. Furthermore, surface activity parameters, i.e. surface tension (γ CMC) and critical micelle concentrations were determined. Results are compared to C12–14 alcohol ethoxylates (LaE n ). Accordingly, it was found that the studied 2-ethylhexyl alcohol based compounds are effective, low foaming nonionic surfactants.
WHO Food Additives Series No. 42, 1999 - INCHEM
Acetaldehyde (EHC 167, 1995) - IPCS INCHEM
2-Ethylhexanol - Wikipedia
Government and NGOs | IHS Markit
Encyclopedia of Chemical Processing and Design
Structure, properties, spectra, suppliers and links for: 2-Ethylhexanol, 104-76-7.
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