Examples of 'e-caprolactam' in a sentence
Meaning of "e-caprolactam"
E-Caprolactam (noun) - A chemical compound used in the production of nylon. Example: The e-caprolactam market has seen fluctuations due to changes in demand
How to use "e-caprolactam" in a sentence
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e-caprolactam
The reaction to e-caprolactam can be performed continuously.
This polymer is obtained by the polymerization of e-caprolactam.
Liquid crude e-caprolactam is fed into a crystallizer.
No extraction is performed in this example to isolate e-caprolactam.
Many solvent for e-caprolactam are suitable.
Recovering the resulting purified e-caprolactam.
Separation of e-caprolactam and oligomers can thus be avoided.
These compounds are also known as e-caprolactam precursors.
In the examples e-caprolactam is isolated by extraction with chloroform.
This purification procedure results in e-caprolactam of very good quality.
Preferably, e-caprolactam is separated by extraction using an organic extraction agent.
The lactam is preferably e-caprolactam or laurolactam.
A low e-caprolactam content is advantageous as it allows of dissolution of a larger amount of hydrogen.
In a preferred embodiment to prepare e-caprolactam the following steps are performed,.
An e-caprolactam is manufactured according to the process disclosed in the patents cited above.
See also
If this ratio is too low the e-caprolactam yield is negatively influenced.
Oligomer formation is as a rule considered to be disadvantageous when the desired product is e-caprolactam.
Purification of the e-caprolactam is done by means of oxidation.
In addition, the present invention is useful in copolymerizations of e-caprolactam with other monomers.
High yields to e-caprolactam can be advantageously achieved at these higher concentrations.
It has been found that higher overall yields to e-caprolactam can then be achieved.
This overall yield to e-caprolactam is too low for a commercially attractive process.
Formation of these compounds will negatively influence the overal yield to e-caprolactam.
This object is achieved in that the crude e-caprolactam is purified by a crystallization process.
The invention relates to a process for the continuous purification of crude e-caprolactam.
The crystallized e-caprolactam resulting from concentrating is generally sufficiently pure to be used directly.
Cyclic dimer forms during the initial ring opening of e-caprolactam in the polymerization.
A part of the molten e-caprolactam crystals is recycled to the crystal washcolumn as washing liquid.
Formation of these compounds will then negatively influence the overall process yield to e-caprolactam.
After the reaction e-caprolactam is isolated from the reaction mixture through extraction or distillation.
A preferred class of alkyl phenols have a boiling point which is higher than that of e-caprolactam.
High yields of e-caprolactam of high quality can be obtained with these liquid phase processes.
In the crystallizer conditions are set such that e-caprolactam crystals and a mother liquid are formed.
The invention relates in particular to the conversion of cyclohexanone oxime into the corresponding e-caprolactam.
In the TNO-Thijssen hydraulic wash column the purified e-caprolactam is obtained as a liquid melt.
This disadvantage does not occur when extraction is used as the method for isolating e-caprolactam.
E-Caprolactam is useful as a raw material for nylon or the like.
Preferably, the solution of ammonium sulfate is produced from a process for producing e-caprolactam or acrylonitrile.
The specifications of the e-caprolactam formed in this way are reported in Table 2.
Higher residence time or a longer contact time will result in that more e-caprolactam is formed.
For example, e-caprolactam which is industrially useful is produced by Beckmann rearrangement of cyclohexanone oxime.
According to this article the formation of these oligomers is disadvantageous for the e-caprolactam yield.
According to Beckmann rearrangement result in crude e-caprolactam containing a different pattern of impurities.
Hindered alcohols are less susceptible to react to N-alkylation products of e-caprolactam.
The partition coefficient for e-caprolactam was as in Example I.
Actually, a suspension of LR in hot acetonitrile can be titrated by addition of e-caprolactam.
Process to prepare e-caprolactam wherein the following steps are performed,.
A back wash can be performed by extracting the alcohol phase containing the e-caprolactam with water.
The residue contains e-caprolactam + e-caprolactam precursors, comprising also some oligomers.
Example C corresponds to a polycaproamide obtained by polymerization of e-caprolactam.
