摘要:
Butane-1,4-diol is produced by converting allyl alcohol to an allyl t-alkyl or -cycloalkyl ether of the general formula: ##STR1## wherein R.sub.1 and R.sub.2 each, independently of the other, represent a C.sub.1 to C.sub.4 alkyl radical, and R.sub.3 and R.sub.4 each, independently of the other, represent a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, or wherein R.sub.1 represents a C.sub.1 to C.sub.4 alkyl radical, R.sub.2 and R.sub.3 together with the carbon atoms to which they are attached form a 5-membered or 6-membered cycloaliphatic ring, and R.sub.4 represents a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, followed by reacting resulting compound of formula (III) under hydroformylation conditions with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst to form a corresponding aldehyde-ether of the general formula: ##STR2## reducing resulting aldehyde-ether of the general formula (II) to form a corresponding hydroxy-ether of the general formula: ##STR3## and cleaving resulting hydroxy-ether of the general formula (II) to give butane-1,4-diol. Typically R.sub.1 and R.sub.2 each represent a methyl group while R.sub.3 and R.sub.4 each represent a hydrogen atom. The alkene of the general formula: ##STR4## released upon cleavage of the hydroxy-ether of formula (II) can be recycled for reaction with further allyl alcohol to form a further quantity of the ether of the general formula (III).
摘要:
Aldehyde ethers of the general formula ##STR1## wherein R.sub.1 and R.sub.2 each, independently of the other, represent a C.sub.1 to C.sub.4 alkyl radical, and R.sub.3 and R.sub.4 each, independently of the other, represent a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, or wherein R.sub.1 represents a C.sub.1 to C.sub.4 alkyl radical, R.sub.2 and R.sub.3 together with the carbon atoms to which they are attached form a 5-membered or 6-membered cycloaliphatic ring, and R.sub.4 represents a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, and wherein Y represents --CH.sub.2 --CH.sub.2 --C.sub.2 or --CH.sub.2 --CH (CH.sub.3)--, are prepared by hydroformylation of a corresponding compound of formula: ##STR2## by reaction with hydrogen and carbon monoxide in the presence of a hydroformylation catalyst, e.g. a rhodium complex catalyst. Preferred compounds include 4-t-butoxybutyraldehyde and 3-t-butoxy-2-methylpropionaldehyde. The compounds are useful chemical intermediates in the production of, for example, butane-1,4-diol, butyrolactone and tetrahydrofuran.
摘要:
Tetrahydrofuran is produced by converting allyl alcohol to an allyl t-alkyl or -cycloalkyl ether of the general formula: ##STR1## wherein R.sub.1 and R.sub.2 each, independently of the other, represent a C.sub.1 to C.sub.4 alkyl radical, and R.sub.3 and R.sub.4 each, independently of the other, represent a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, or wherein R.sub.1 represents a C.sub.1 to C.sub.4 alkyl radical, R.sub.2 and R.sub.3 together with the carbon atoms to which they are attached form a 5-membered or 6-membered cycloaliphatic ring, and R.sub.4 represents a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, followed by reacting resulting compound of formula (III) under hydroformylation conditions with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst to form a corresponding aldehyde-ether of the general formula: ##STR2## reducing resulting aldehyde-ether of the general formula (I) a corresponding hydroxy-ether of the general formula: ##STR3## and cleaving resulting hydroxy-ether of the general formula (II) under dehydrating conditions to produce tetrahydrofuran. Typically R.sub.1 and R.sub.2 each represent a methyl group while R.sub.3 and R.sub.4 each represent a hydrogen atom. The alkene of the general formula: ##STR4## released upon cleavage of the hydroxy-ether of formula (II) can be recycled for reaction with further allyl alcohol to form a further quantity of the ether of the general formula (III).
摘要:
Aldehyde ethers of the general formula ##STR1## wherein R.sub.1 and R.sub.2 each, independently of the other, represent a C.sub.1 to C.sub.4 alkyl radical, and R.sub.3 and R.sub.4 each, independently of the other, represent a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, or wherein R.sub.1 represents a C.sub.1 to C.sub.4 alkyl radical, R.sub.2 and R.sub.3 together with the carbon atoms to which they are attached form a 5-membered or 6-membered cycloaliphatic ring, and R.sub.4 represents a hydrogen atom or a C.sub.1 to C.sub.3 alkyl radical, and wherein Y represents --CH.sub.2 --CH.sub.2 --CH.sub.2 or --CH.sub.2 --CH (CH.sub.3)--, are prepared by hydroformylation of a corresponding compound of formula. ##STR2## by reaction with hydrogen and carbon monoxide in the presence of a hydroformylation catalyst, e.g. a rhodium complex catalyst. Preferred compounds include 4-t-butoxybutyraldehyde and 3-t-butoxy-2-methylpropionaldehyde. The compounds are useful chemical intermediates in the production of, for example, butane-1,4-diol, butyrolactone and tetrahydrofuran.
摘要:
A process is described for the production of substantially pure gamma-butyrolactone from a feed mixture containing a major amount of gamma-butyrolactone and a minor amount of diethyl succinate which comprises fractionally distilling the mixture in a fractionation zone in the presence of added diethyl maleate and recovering from the fractionation zone an overhead vaporous product comprising gamma-butyrolactone which is substantially free from diethyl succinate and a liquid bottom product comprising diethyl maleate and diethyl succinate in admixture one with another. This procedure can be used to separate a gamma-butyrolactone rich fraction obtained by distillation in one or more stages of a crude reaction product obtained by hydrogenation of a C.sub.4 dicarboxylic acid ester feedstock that contains a major molar amount of diethyl maleate and a minor molar amount of diethyl succinate, using a diethyl maleate feedstock from an esterification plant to provide both diethyl maleate for use in the fractionation zone and also diethyl maleate for use as feedstock for the hydrogenation process.
摘要:
n-Valeraldehyde is produced by hydroformylation of butene-1 in the presence of one or more of cis- and trans-butene-2 and iso-butylene using a rhodium complex catalyst such as HRh(CO)PPh.sub.3).sub.3. Reaction conditions include use of at least about 100 moles of free triorganophosphine per gram atom of rhodium, a temperature of about 80.degree. C. to about 130.degree. C., a total pressure of not more than about 50 kg/cm.sup.2 absolute, a partial pressure of carbon monoxide of not more than about 1.5 kg/cm.sup.2 absolute, and a partial pressure of hydrogen of from about 1.0 to about 7.5 kg/cm.sup.2 absolute. An n-/iso-ratio of 20:1 and a conversion efficiency of butene-1 to n-valeraldehyde of over 85% are possible under these conditions with essentially no resin formation despite the presence of iso-butylene. The n-/iso-valeraldehyde mixture can be aldolized and reduced without intermediate purification to give a commercially acceptable C.sub.10 -plasticizer alcohol.
摘要:
A rotor for a high speed generator is constructed of a plurality of laminations and interlamination disks, which are disposed between each of the laminations. A coil support assembly is disposed within each of the rotor interpole regions and is secured to the interlamination disks.
摘要:
A wedge-shaped member to restrain coil windings of a generator rotor from moving under centrifugal force. The wedge-shaped, substantially hollow member including a first plate, a second plate positioned opposite the first plate and positioned at an angle relative to the first plate, and one or more reinforcing members coupled between the first plate and the second plate. The wedge-shaped member is configured to fit between the core poles of a generator. A plurality of holes in the first and/or second plates permit a bonding material to adhere to adjacent coil windings and spread through the holes.
摘要:
Butane-1,4-diol is produced by vapor phase hydrogenolysis of an alkyl ester of a C.sub.4 dicarboxylic acid, e.g. diethyl maleate, over a reduced Cu-Cr or Cu-Zn mixed oxide catalyst. Two adiabatic hydrogenolysis zones are used. The mixture exiting the first of these zones is cooled (by, for example, 5.degree. C.) and the resulting cooled mixture is fed to the second zone in which is reequilibriates at a lower temperature to increase the butane-1,4-diol yield at the expense of gamma-butyrolactone. Typical reaction conditions include use of temperatures of 150.degree. C. to 200.degree. C., pressures of 25 to 70 bar, and a H.sub.2 :ester molar ratio of 100:1 to 800:1. When using a maleate ester it is often advantageous to hydrogenate this to the corresponding succinate ester in an upstream hydrogenation zone prior to entry to the first hyrogenolysis zone.
摘要:
A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the presence of hydrogen in a selective hydrogenation zone maintained under selective hydrogenation conditions effective for selective hydrogenation of impurities containing reactive carbonyl groups thereby to hydrogenate the impurities to the corresponding alcohols. After recovery from the selective hydrogenation zone of a selectively hydrogenated reaction product mixture including the alkyl alkanoate and the corresponding alcohols, this is distilled in one or more distillation zones so as to produce substantially pure alkyl alkanoate therefrom which is recovered.