The method of producing styrene

 

(57) Abstract:

Usage: petrochemistry. Essence: carry out the catalytic dehydrogenation of ethylbenzene at 550-650C in the presence of water vapor and mixtures of isoamylenes or cumene, which previously administered in ethylbenzene before beginning the process of dehydrogenation, when the molar ratio of ethylbenzene: mixture of isoamylenes:water vapor, respectively 0,9-0,8:0,1-0,2:18:21 or ethylbenzene:cumene:water vapor 0,05-0,1:0,95-0,99:18-21. Technical result: the expansion of the Arsenal of methods of obtaining styrene and reduce energy consumption to receive it.

The invention relates to a method for producing styrene and can be used in the petrochemical industry.

A known method of producing styrene by dehydrogenation of ethylbenzene on micaceous iron catalysts containing 55-80% of iron oxide, 2-28% of chromium oxide, 15-35% potassium carbonate and some other oxide additives, in a current of steam. The presence of water vapor is a necessary condition for stable operation samoreguliruemaja catalysts based on iron oxide used for the dehydrogenation of alkylaromatic compounds. When dehydrogenating the molar ratio of ethylbenzene:water is a mini-synthesis. Chemistry, 1988, S. 459-464).

The disadvantage of this method is not a high yield of styrene equal to 45 wt.%.

There is also known a method of producing styrene by the catalytic dehydrogenation of ethylbenzene at 590-S in the presence of steam at a mass ratio of the ethyl benzene:water vapor equal to 1:2,6 respectively (see P. Kirpichnikov, A., Beresnev Century Century Album of technological schemes of the main production of the synthetic rubber industry. - L.: Chemistry, 1976, S. 51 and 52).

The disadvantage of this method is not a high yield of styrene is equal to 40 wt.%.

Closest to the invention is a method of producing styrene by the catalytic dehydrogenation of ethylbenzene at 550-650C in the presence of water vapor and hydrocarbons toluene and benzene, which is injected throughout the process of dehydrogenation. The molar ratio of benzene: benzene: toluene: water vapor is 1:0,04-0,11: 0,11-0,25:14-18 respectively (see SU inventor's certificate 1018935, IPC C 07 C 15/46, 1983).

The disadvantage of this method is the need for input of hydrocarbons throughout the process of dehydrogenation at a constant heating hydrocarbon diluents to high temperatures, which requires to the styrene and the reduction of energy consumption.

Technically, the problem is solved by a method of producing styrene by the catalytic dehydrogenation of ethylbenzene at 550-650C in the presence of water vapor and hydrocarbons, which as a hydrocarbon, a mixture of isoamylenes or isopropylbenzene, which previously administered in ethylbenzene before beginning the process of dehydrogenation, when the molar sootnoshenii ethylbenzene:mixture of isoamylenes:water vapor, respectively 0,9-0,8 0,1 to 0,2:18-21 or ethylbenzene: cumene: water vapor 0,05-0,01:0,95-0,99:18-21.

Technical solution allows you to expand the Arsenal of methods for producing styrene and reduce the energy consumption to receive it.

Characteristics of substances used in the process:

Agilent - GOST 9385-77.

A mixture of isoamylenes - isomeric composition of isoamylenes: 2-methylbutan-2,2-methylbutan-1, 3-methylbutan-1.

Isopropylbenzene, colorless transparent liquid, TKip=152,39 C.

Use micaceous iron catalyst K-24AND TO 24.

This invention is illustrated by the following examples of specific performance.

Example 1. In the reactor zone of constant temperature, which is a tube of steel HT with an inner diameter of 20 mm, load 15 seem subjected to activate the steam-air mixture, consists of heating the catalyst in a stream of air up to 400C, and then in an atmosphere of water vapor (water is supplied at a rate of two times smaller than in contact) to 600C. At this temperature, the catalyst was allowed to stand for 1 h in a current of steam-air mixture, and then into the reactor serves ethylbenzene. in pre-injected with a mixture of isoamylenes.

Ethylbenzene from a mixture of isoamylenes served for 15 min at 600C with a bulk velocity of 1.2 h-1. The molar ratio of ethylbenzene:mixture of isoamylenes: water vapor, respectively, of 0.9:0,1:18. Then the flow of ethylbenzene and a mixture of isoamylenes stop and serves water vapor at the same rate within 1 h after a specified time served ethylbenzene and keep dehydration at 600C, space velocity of ethylbenzene 1,2 h-1and dilution steam 1:18 moles.

The monitoring process is conducted according to chromatographic analysis, the content in the reaction mass of ethylbenzene and styrene.

The output of styrene 61,46%.

Example 2. Similar to example 1. The difference is that ethyl benzene with a mixture of isoamylenes served within 30 minutes Yield of styrene 65,72%.

Example 3. Similar to example 1. The difference is that the iMER 1. The difference is that ethyl benzene with a mixture of isoamylenes served within 120 minutes the Yield of styrene 63,99%.

Example 5. Similar to example 1. The difference is that ethyl benzene with a mixture of isoamylenes served within 180 minutes Yield of styrene 66,75%.

Example 6. Similar to example 1. The difference is that using the molar ratio of ethylbenzene: mixture of isoamylenes: water vapor, respectively 0,8:0,2:18. Ethylbenzene from a mixture of isoamylenes served within 30 minutes Yield of styrene 66,69%.

Example 7. Similar to example 6. The difference is that ethyl benzene with a mixture of isoamylenes served within 60 minutes Yield of styrene 68,19%.

Example 8. Similar to example 6. The difference is that using the molar ratio of ethylbenzene: mixture of isoamylenes:water vapor, respectively 0,8:0,2:21. Ethylbenzene from a mixture of isoamylenes served within 120 minutes the Yield of styrene 64,80%.

Example 9. Preparation of the catalyst to work similar to example 1. The difference is that in the reactor for 45 min serves ethylbenzene, in which pre-enter isopropylbenzene. The molar ratio of ethylbenzene: cumene: water vapor, respectively, of 0.05:0.95:18. The output of styrene 63,33%.

Example 10. Podgotovkata, in which pre-enter isopropylbenzene. The molar ratio of ethylbenzene: cumene: water vapor, respectively 0,01:0,99:21. The output of styrene 63,65%.

An example of a specific implementation of the prototype.

Catalytic dehydrogenation of ethylbenzene is carried out at 550-650C in the presence of water vapor and hydrocarbons toluene and benzene, which is injected throughout the process of dehydrogenation. The molar ratio of benzene: benzene: toluene: water vapor 1:0,04-0,11:0,11-0,25:14-18 respectively. The output of styrene 59,05-68.75 kilopascals%.

Thus, as can be seen from the examples of embodiment, the yield of the target product - styrene remains at the level of the prototype 61,46 - 68,19%. The item allows you to expand the Arsenal of methods for producing styrene with less power.

The method of producing styrene by the catalytic dehydrogenation of ethylbenzene at 550-650C in the presence of water vapor and hydrocarbons, characterized in that as a hydrocarbon, a mixture of isoamylenes or isopropylbenzene, which previously administered in ethylbenzene before beginning the process of dehydrogenation, when the molar ratio of ethylbenzene:mixture of isoamylenes:water vapor, respectively 0,9-0,8:0,1-0,2:18:21 or Ativ the

 

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FIELD: petrochemical processes.

SUBSTANCE: method provides for three-stage isolation of aromatic hydrocarbons in the separation, absorption, and separation stages using, as absorbent, ethylbenzene rectification bottom residue. Loaded absorbent containing diethylbenzene isomer mixture serves as starting material for production of alkylaromatic hydrocarbons including divinylbenzene.

EFFECT: reduced loss of aromatic hydrocarbons and improved economical efficiency of styrene production process.

2 dwg, 1 tbl, 5 ex

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