The method of producing monoalkylbenzenes

 

(57) Abstract:

The invention relates to the field of petrochemicals, in particular the production of monoalkylbenzenes interaction of benzene with olefins in the presence of aluminum chloride recycle of polyalkylbenzenes. The technical result - the reduction of output polyalkylbenzenes resin. To do this, hold separate parallel alkylation reaction and parallelomania in two special devices. Parallelomania subjected fraction polyalkylbenzenes (Pubs) with content of heavy Pubs no more than 3 wt. % if 80oC and above. 2 C.p. f-crystals, 1 Il.

The invention relates to a method of producing monoalkylbenzenes interaction of benzene with olefins in the presence of a catalyst system based on aluminum chloride recycle of polyalkylbenzenes.

A known method of producing ethylbenzene by parallelomania polyalkylbenzenes resin in the presence of benzene and catalyst complex on the basis of aluminum chloride (ed. St. USSR N 988801, publ. 15.01.83,)

The disadvantage of this method is that in terms of parallelomania heavy polyalkylbenzene (Penta, exaustively) and deep-condensing (resin) contribute to the SS="ptx2">

Closest to the proposed method is two-stage process for the production of cumene, which are consistently implemented alkylation reaction of benzene with propylene and parallelomania of polyalkylbenzenes involving alkylate the first stage in two special devices (see R. 3.Akhmedov, B. C. Lobkin, M. A. Dalin // refining and petrochemicals, N 6 - 1976 S. 34). The disadvantage of this method is the flow in the reactor parallelomania alkylate with a high content of cumene. Raw materials entering the reactor has a composition close to equilibrium with the presence of higher polyalkylbenzenes. When this catalyst system based on aluminum chloride, prone to active adsorption polyalkylbenzenes, quickly deactivated and, in the case of keeping this system in the reactor for a long time, leads to the formation of heavy hydrocarbons and resins. This not only reduces the yield of cumene, but increases the consumption of catalyst and other material and energy costs.

The invention solves the problem of reducing the formation of products of deep alkylation of benzene with olefins and the condensation products (resin).

To achieve the outlined technical R is a diversified holding alkylation reaction and parallelomania in two reactors. In the first reactor, flows through the reaction of alkylation of benzene with olefins in the second reaction parallelomania fraction polyalkylbenzenes containing not more than 3 wt.% heavy polyalkylbenzenes involving benzene.

Distinctive features of the proposed method are simultaneous parallel conducting the alkylation reaction and parallelomania in two separately installed reactors involvement in the process of parallelomania at 80oC and higher fraction of light (di-, tri-) polyalkylbenzenes, this prevents flow in peralkylated significant amounts of monoalkylbenzenes (alkylate) and heavy polyalkylbenzenes (resin) that prevents overrun of the catalyst complex and reduces the yield of tar.

The proposed method is illustrated by a drawing, which shows a diagram of the two-stage gain monoalkylbenzenes.

The diagram shows peralkylated 1, alkylator 2.

The method is as follows.

In peralkylated 1 arrive fresh (I) or a mixture of fresh and return (I+IV) catalyst complex, benzene (II) 50 to 70 wt.% and the fraction of polyalkylbenzenes (III) 25 to 32 wt.%.

In alkylator 2 arrive fresh EAGA system sludge and separation from the catalyst complex, come to the distillation Assembly. Using the proposed method allows to take into account peculiarities of the alkylation reaction and parallelomania separately and hold them in optimal conditions. This prevents the circulation of heavy polyalkylbenzenes in peralkylated, decrease the condensation reaction and the output polyalkylbenzenes resin.

The method is illustrated by the following examples were conducted at the same time and pressure.

Example 1. In peralkylated 1 arrive fresh catalyst complex, benzene, and the fraction of polyalkylbenzenes. The composition of the initial reaction mixture, wt. %: benzene 59,9; ethylbenzene 1,8; sum (di-, tri-) ethylbenzol 26,5 and the amount of polyalkylbenzenes above trialkylborane (heavy polyalkylbenzenes) of 1.4. The reaction mass after dealkylation system sludge from the catalyst complex contains the Mac. %: benzene 50,5; ethylbenzene 40,0; (di-, tri-) ethylbenzol 7,2; heavy 1,8; aluminium chloride 0,13 - temperature dealkylation 150oC.

Example 2. In peralkylated arrive fresh catalyst complex, benzene, and the fraction of polyalkylbenzenes. The composition of the initial reaction mixture, wt. %: benzene 57,4; ethylbenzene 4,8; polyalkylbenzene 31,6; heavy 6,9. Recently 14,9; heavy 6,0; aluminium chloride is 0.25. The temperature in dealkylation 80oC.

Example 3. In peralkylated 1 arrive fresh catalyst complex, benzene, and the fraction of polyalkylbenzenes. The composition of the initial reaction mixture, wt. %: benzene 59,2; ethylbenzene 8,1; polyalkylbenzene 29,4, heavy 2,9. Reaction mass dealkylation contains, wt%: benzene 44,9; ethylbenzene 42,2; (di-, tri-) ethylbenzol 9,6; heavy 3,0; aluminium chloride 0,19. The temperature in dealkylation 110oC.

Example 4. In peralkylated 1 receives a mixture of fresh and return of the catalyst complex in the ratio 1:1, benzene and the fraction of polyalkylbenzenes.

The composition of the initial reaction mixture, wt.%: benzene 71,4; diisopropylphenol 26,8; heavy polyalkylbenzene of 1.6. The reaction mass after dealkylation system sludge contains, wt%: benzene 59,4; isopropanol 31,9; diisopropylphenol 5,8; heavy polyalkylbenzene 0,4; aluminium chloride 0,12. The temperature in dealkylation 80oC.

Example 5. In alkylator 1 arrive fresh catalyst complex, benzene, and the fraction of polyalkylbenzenes. The composition of the initial reaction mixture, wt.%: benzene 69,9; ethylbenzene 1,7; (di-, tri-) ethylbenzol 26,5, heavy 1,4. Reaction mass dealkylation posy of 0.4. The temperature in dealkylation 75oC.

As seen from the above examples, the process of parallelomania fraction polyalkylbenzenes precluding admission peralkylated heavy polyalkylbenzenes and monoalkylphenol provides effective dealkylation (di-, tri-) ethylbenzol and yield heavy (resins).

1. The method of producing monoalkylbenzenes by two-stage implementation process of alkylation and parallelomania in two special apparatus in the presence of a catalyst system based on aluminum chloride, characterized in that parallelomania subjected fraction polyalkylbenzenes with content of heavy polyalkylbenzenes not more than 3 wt.%.

2. The method according to p. 1, characterized in that the process parallelomania conduct parallel to the alkylation process.

3. The method according to p. 1 or 2, characterized in that the process parallelomania carried out at 80oC and above.

 

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