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Thread: Do you know these three industrial manufacturing process of toluene

  1. #1 Do you know these three industrial manufacturing process of toluene 
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    Toluene is an aromatic hydrocarbon that is widely used as an industrial feedstock and as a solvent. Toluene occurs naturally at low levels in pine oil and is usually produced in the processes of gasoline via a catalytic reformer, in an ethylene cracker or making coke from coal. Final separation, either via distillation or solvent extraction, takes place in one of the many available processes for extraction of benzene, toluene and xylene isomers.

    Alternate Catalytic Reforming Processes.

    Several catalytic reforming processes have been developed by various organizations.
    The processes differ in details, operating conditions, and type of catalyst used. Some of these processes are listed below.
    Fluid Hydroforming Process uses a fluidized solids technique in the reactor and continuous regeneration of the molybdenum on alumina catalyst in a separate vessel.
    Platforming is a fixed bed process using several reactors in series with intermediate reheating. Catforming is also a fixed process using a platinum catalyst.


    Present day the method used to produce Toluene is by separating the aromatic Mixture.


    The methods used to separating benzene, toluene and xylene are grouped as -

    a. Fractional distillation - The various components of crude oil have different sizes, weights and boiling temperatures; so, the first step is to separate these components. Because they have different boiling temperatures, they can be separated easily by a process called fractional distillation. Hence, toluene is separated by boiling components at different boiling points.

    b. Azeotropic distillation - Azeotropic distillation can be defined as distillation in which the added substance forms an azeotrope. Two commercial processes have been developed for the separation of toluene using azeotropic distillation. One using an aqueous solution of methyl ethyl ketone and water and the other using methanol. Both processes operate on a narrow boiling range concentration gradient.

    c. Extractive distillation Extractive distillation can be defined as distillation in the presence of a substance which is relatively non-volatile compared to the components to be separated, and which, therefore, is charged continuously near the top of the fractionating tower, so that an appreciable concentration is maintained on all plates in the tower below its entry.

    The extractive distillation involves the use of a solvent for liquid-liquid extraction. Many different solvents are suitable, including sulfolane (C4H8O2S), furfural (C5H4O2), tetraethylene glycol (C8H18O5), dimethylsulfoxide (C2H6OS), and N-methyl-2-pyrrolidone (C5H9NO).


    d. Solvent extraction - The most important requirement for a solvent in a solvent extraction process are that it should have a high selectivity for aromatics against non- aromatics, that a two- phase system is obtained in a reasonable range of temperature, and that the phases should separate within a reasonable range of temperature; of course it must also be non- corrosive, non- reactive and thermally stable.

    References:
    3 widely used toluene industrial production methods Hydroforming, Catalytic Reforming, Coal Gas

    http://www.sbioinformatics.com/desig...Production.pdf



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    Genius Duck Dywyddyr's Avatar
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    And?


    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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    Universal Mind John Galt's Avatar
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    Moderator Comment: bejoy this is a discussion forum, not a blog. What is it you wish to discuss?
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    Bullshit Intolerant PhDemon's Avatar
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    I'm coming to the conclusion it's spam for this "World of Chemicals" site...
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    okay i will only discuss from now on i though i would sahre something which is very inresting to users, anyways i will only post when i have some thing to discuss thanks for letting me know anyway
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    exchemist
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    Quote Originally Posted by bejoy View Post
    okay i will only discuss from now on i though i would sahre something which is very inresting to users, anyways i will only post when i have some thing to discuss thanks for letting me know anyway
    Bejoy, why do you think it is of interest to send us randomly chosen chunks of information, about randomly chosen substances? We can look this sort of thing up if we need to know. It's like sending out random pages of the telephone directory.
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