SU1294816A1 - Method of producing olefin hydrocarbons - Google Patents

Abstract

The invention relates to petrochemistry, in particular to a method for producing olefinic hydrocarbons (OU). An increase in the yield of the OS (ethylene and the amount of unsaturated hydrocarbons — C2 – C4) is achieved by using a catalyst (kg) of a different composition and other process conditions. OU is obtained by pyrolysis at 775-785 C of gasoline fractions in the presence of hydrogen, water vapor and CG composition, wt.%: Indium oxide chromium 1-2; ceramic carrier up to 100. The yield of ethylene is increased to 42.2%, and the amount of unsaturated hydrocarbons to 60.7%. 1 3.p.f-ly. with

Description

. The invention relates to a process for the production of olefinic hydrocarbons from petroleum feedstock and may find application in the petrochemical industry.

The aim of the invention is to increase the yield of ethylene and the amount of unsaturated hydrocarbons of composition Cj-C

Example 1, Pyrolysis of gasoline fraction 28-165 C, containing 63.4 wt.% Paraffin, 31 wt.% Naphthenic and 5.7 wt.% Aromatic hydrocarbons in the presence of a catalyst, containing 10 wt.% Indium oxide and 1 wt.% chromium oxide, on a ceramic carrier at 775 ° C, bulk flow rate 3 h, molar ratio hydrogen; one . steam: raw materials 0,5: 1,5: 1. The overflow of products for the skipped raw materials is, wt%: ethylene 42.2; propylene: 14.6; the amount of unsaturated hydrocarbons composition 60,6. Gas generation 90.8%.

Example 2. It differs from Example 1 in that the pyrolysis is carried out in the presence of a catalyst containing 7% by weight of indium oxide and 2% by weight of chromium oxide on a ceramic

carrier, molar ratio

catalyst containing 7% by weight of indium oxide and 2% by weight of chromium oxide, on a ceramic carrier, at 785 ° C, volumetric rate I

hydrogen: water vapor: raw materials 0.8: 2: 1.

The yield of products on the missed raw cottage raw materials 3, molar ratio

% by weight: ethylene 42.0; hydrogen: water vapor: raw materials 0.8: 1.5: 1.

propylene 14.5, the amount of unsaturated. The yield of products on the missing raw materials 60,7. Gas formation of 89.8 wt.% 35 is, wt.%: Ethylene 42.1,

Example 3. Diffusion of propylene 14.3, the amount of unsaturated

Example 1 in that the pyrolysis of the wire mC2-C4 60,5. Gas formation

in the presence of a catalyst, with a content of 91.0 wt.%.

- Example 8. Differs from 40

10% by weight of indium oxide and 0.5% by weight of chromium oxide, on a ceramic support, with a molar ratio of hydrogen: water vapor: raw materials 0.8: 1.5: 1. The yield of products on the missing raw material is, wt.%: Total ethylene is 41.0; propylene 15.2; and the amount of unsaturated hydrocarbons composition 60,6, Gassing 89,4 wt.%

45

Example 7 in that the pyrolysis is carried out at 740 ° C. The yield of products on the missing raw material is, wt.%: Ethylene 31.7, propylene 18.1, the amount of unsaturated 55.6. Gas generation 77.9 wt.%.

Example 9, differs from example 7 in that the pyrolysis is carried out at 800 ° C and a molar ratio of hydrogen:: water: phosphorus 0.8: 2: 1, The yield of the products for the feedstock is, wt%: ethylene 41.9, propylene 11.9 ,. the amount of unsaturated 56.5. Gas generation 92.1 wt.%. Conducting the pyrolysis process at temperatures below 775 ° C reduces the yield of target products, and at temperatures above does not have a significant effect.

Example 4. It differs from Example 1 in that the pyrolysis is carried out in the presence of a catalyst containing 13% by weight of indium oxide and 1% by weight of chromium oxide on a ceramic support. The yield of products on the missing raw material is, wt.% Ethylene 41.8 propylene 14.7, however, the amount of unsaturated hydrocarbons composition

„

begins to decline: 60.4, hectare concentration-91.1 wt.%

Example 5, differs from example 1 in that the pyrolysis is carried out in the presence of a catalyst containing 7% by weight of indium oxide and 4% by weight of chromium oxide on a ceramic carrier, with a molar ratio of hydrogen: water vapor: raw materials 0.5 : 2: 1. The ethylene yield is 42.0% by weight of the feedstock, however, the yield of propylene and the amount of unsaturated hydrocarbons is only 14.3 and 60.3% by weight, respectively. Gas generation 90.1 wt.%

Example 6. It differs from Example 1 in that the pyrolysis is carried out in the presence of a catalyst containing. 4% by weight of indium oxide and 2% by weight of chromium oxide, on a ceramic carrier, with a molar ratio of hydrogen: water vapor: raw materials 0.8: 1.5: 1. The yield of products for the missing raw material is, wt.%: Ethylene, 39.3, propylene, 15.8% of the amount of unsaturated 58.9. Gas generation 87.0 wt.%.

Example 7. Pyrolysis of gasoline fraction 28-165. C is carried out in the presence of 5

0

thirty

catalyst containing 7% by weight of indium oxide and 2% by weight of chromium oxide, on a ceramic carrier, at 785 ° C, volumetric rate I

 raw material dachas 3 molar terms

- Example 8. Differs from 40

45

Example 7 in that the pyrolysis is carried out at 740 ° C. The yield of products on the missing raw material is, wt.%: Ethylene 31.7, propylene 18.1, the amount of unsaturated 55.6. Gas generation 77.9 wt.%.

Example 9, differs from example 7 in that the pyrolysis is carried out at 800 ° C and a molar ratio of hydrogen:: water vapor: phosphorus 0.8: 2: 1, Yield - products for the skipped raw material, wt.%: Ethylene 41.9, propylene 11.9 ,. the amount of unsaturated 56.5. Gas generation 92.1 wt.%. Conducting the pyrolysis process at temperatures below 775 ° C reduces the yield of target products, and at temperatures above does not have a significant effect.

50

31

Pyrolysis of the same gasoline fraction under the conditions of a known method yields an ethylene yield of only 41.5 wt.% For the feedstock.

The data presented show that increasing the content of indium oxide in the catalyst from 10 to 13% does not have a noticeable effect on the yield of target samples, therefore, it is not advisable to introduce indium oxide into the catalyst in an amount of more than 10% (increase in the cost of the catalyst. At the same time a decrease in the content of indium oxide from 7 to 4% leads to a noticeable decrease in the yield of ethylene and the amount of unsaturated. Therefore, it is also impractical to introduce indium oxide into the catalyst in an amount of less than 7%.

Similarly, an increase in the chromium oxide content in the catalyst from 2 to 4% does not significantly affect the yield of the target products. Therefore, enter into

Compiled by N. Bogdanova Editor N. Egorova Tekhred LeOleinikKorrektor E.Roshko

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catalyst composition of more than 2% chromium oxide is impractical.

Claims (2)

Invention Formula 1, a method for producing olefinic hydrocarbons by pyrolysis of gasoline fractions in the presence of water vapor and a catalyst on a ceramic carrier containing indium oxide, characterized in that, in order to increase the yield of the target products, the process is carried out in the presence of hydrogen and a catalyst that additionally contains oxide chromium, in the following ratio of components, May,%: Indium Oxide .7-10 Chromium oxide1-2 Ceramic carrierUp to 100 2. The method according to claim 1, characterized in that the process is carried out at 775-785 ° C.