DEP0049016DA - Process for the continuous purification of benzene hydrocarbons into pure goods - Google Patents

Description

Process for the continuous purification of

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To replace the ^ ehargenweise treatment agitator in an effort _ninth does one have ? * mpol ^ ₁ BeTIg q ^ P ^ -} · ττΡ4 ^ ν ή "Tien

Operation to wash .Man

for this purpose in a finely divided state continuously through one or more using tower-like containers Layers of ion-centered sulfuric acid rise "given = if the sulfuric acid should also rise continuously in the Countercurrent to the benzene- "are carried out.

_{Unfortunately, 9} it turned out that the intended purpose is only incompletely achieved "In contrast to the agitator, in which a large amount of hydrocarbons is washed with relatively little acid, there is a large excess of acid over a small amount of benzene flowing through the wash tower." Although it guarantees complete cleaning, the acid is attacked very intensively, so that undesirable, even harmless, useful benzene companions are attacked. The strong formation of resin quickly manifests itself in clogging of the washer due to excessive clumping.

The obvious reduction of the acid concentration can indeed withdraw resin formation but _for the cleaning is insufficient and the hydrocarbons obtained no longer meet the purity requirements made.

The present invention now shows the way in which the continuous washing can be operated properly. It combines this washing with a known catalytic pressure-free treatment of the hydrocarbons "which in turn does not lead to pure goods" the presence of reducing gases with and without water _s = dampf9, it is possible to achieve a partial removal or conversion us saturated benzene companion into useful hydrocarbons.

Surprisingly, it has been shown that a sufficient effect even without the presence of reducing gases or water = The hydrocarbons via suitable contacts such as minette, bauxite and similar known contacts are sufficient to conduct substances - the temperatures vary depending on the type of contact and vary between 300 and 600 8 ^ SI- um

a conversion of some of the resin formers to cause. The most reactive benzene companions are preferably ent = far away, that is to say precisely those "who cause the disturbances in the continuous Wa = see" The remaining, more slowly rea = yawing benzene companions are elegantly and safely removed from the powerful continuous wash.

In this process, increasing the output of usable hydrocarbons remains a desirable addition

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the catalytic treatment completely received ^ death Although _s provide when selecting suitable contacts without catalysis with hydrogen or water vapor to bewirken.Innere rearrangements likewise the notwen = ended hydrogen, is hydrogen by Abspal = tung of side chains, and incorporation of the cleavage products supplied.

Surface-active substances such as activated charcoal or silica gel have proven to be particularly suitable for this In the case of silica gel, soaking the adsorbent substance with an iron salt solution, preferably the acetate, increases the Effectiveness of the contact »The cheapest weighting is 10-20 $ Ei senal'et at, based on the GreloThese contacts are very superior to the known ones with regard to the mild rearrangement of the saturated ones, especially in the absence of reducing gases. Another great advantage arises in the way the invention works. The undesirable organic sulfur compounds Bonds such as carbon disulfide, mercaptans, thioethers, thiophene and the "w" are completely split during the catalytic treatment. The resulting hydrogen sulfide can easily be bound. This can be done through the refining contact, but it is better especially for the sulfur removal the actual refining = contact-for example the iron-soaked silica gel-one upstream a small furnace with a cheap iron contact, which splits off the sulfur and binds it at the same time for continuous contact withdrawal, the sulfur-saturated contact can be continuously renewed without interruptions.

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after treatment in the sense of the present inventor

sulfur-free pure goods suitable for sale. as none of the known processes has, plus the fact that the products obtained are sulfur-free.

An embodiment explains the operation

Embodiment

A preliminary product of benzene production, from which

After the vapors have been brought to 450 degrees in an exchanger and a heater, they enter a small contact furnace of the same temperature. Here, 1 cbm of contact space is required per ton of hourly throughput Granulated lux mass with 15 1 » soda content is used here.

The vapors then come into an oven at the same temperature. Here, four cubic meters of contact space are calculated on an hourly output of one tonne of benzene. Silica gel is used as contact, to which 25 $> of its weight in iron acetate has been added. After the heat has been released in the exchanger, the vapors are condensed.

The condensed hydrocarbons now enter the continuous acid wash, which consists of three cascading towers, each of which contains sulfuric acid of 78-98 ° or 60-66% concentrated at a layer height of two meters, the hydrocarbons rise through the sulfuric acid layer are washed.

The product leaving the apparatus is a finished product and satisfies all the required tests. In addition, the organic sulfur compounds _9, of which only carbon disulfide is represented in a proportion of 0.2, have been completely removed »

Depending on the type of contact, the pre-contact and the relocation contact can have the same or different temperatures »

Should the market situation require the removal of the pyridine with usable recovery of the same, then the washing can be done with fion-centered acid a washer with about 37% sulfur = acid - also operated continuously - can be switched on "

Claims (2)

to? continuous f, characterized by ₉ that one = the coals Hydrogen before continuous acid treatment is depressurized at temperatures between 300 - 600 ft ^ sÄ above contact substances which is known to cause the conversion of some of the undesired benzene companions into usable hydrocarbons 2.) A process according to / x7), _$ dadurchbgekennzeichnet that contacts particularly as surface active substances such
Activated charcoal or silica gel are used « 3 «) Procedure nachrT !; and 2. ) ₉ thereby identified = records ₉ that the catalytic treatment in the presence of water = _f material hydrogen-containing gas mixtures, or ^ reducing gases going on " 4 *) Method according to 1.) - 3.) »characterized by the fact that in front of the transformation contacts - in particular the surface-active substances '' ^^^^ ^; Zt) - approve a container »
simple iron contacts switches, in which the vapors from below. rise, and the contact can be continuously or temporarily withdrawn and renewed.