SU1328369A1 - Method of protecting metal surfaces of reactors for high-temperature processing of hydrocarbons from coke deposits - Google Patents

Abstract

The invention relates to methods for protecting the metal surfaces of reactors for high-temperature treatment of hydrocarbons from coke deposits and reduces the coke formation on metal surfaces. The surface of the reactor is sequentially treated with a 3-5% solution of sulfur in toluene, dried surfaces sequentially in a stream of nitrogen and hydrogen, and then treated with a 20-30% aqueous solution of liquid glass and dried. 06- the equipment is processed by the proposed method before it is put into operation or during the repair period. 1 tab.

Description

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The invention relates to petrochemistry and can be used in processes for the production of hydrocarbons by dehydrogenation and pyrolysis.

The purpose of the invention is to reduce coke formation on metal surfaces of reactors for high temperature treatment of hydrocarbons.

Example: The experiments were carried out on samples of steel grade Х18Н10Т, size 200 to 10 X 3 (mm). Two samples are placed in a vertical cylindrical quartz reactor, equipped with an electrical winding for heating and a pocket for thermocouple.

Hydrocarbons C (composition, wt.%: C, H, about 40; 56; 4) are fed at a constant rate of 25 l / h into the reactor at a fixed temperature, Coke formation is controlled by the weighing method by weighing the samples before and after the experiment. One of the samples is not processed (standard) J the other is processed according to the proposed method. During the experiments, one of the test parameters is varied. In each example, a fresh pair of samples is used. The test data is tabulated.

As can be seen from the table, the method provides a sharp decrease in coke images on stainless steel specimens. The optimal solution treatment time is at least 10 minutes.

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With a longer processing time, no more significant reduction in coke formation is observed. The concentration of sulfur in toluene should be at the level of 35 wt.%

More concentrated solutions of sulfur are difficult to obtain under normal conditions because of its physico-chemical

10 properties. The use of low concentrated solutions reduces the desired effect. The optimum concentration of liquid glass in water is 20-30 wt.%.

Processing equipment by the proposed method can be carried out. the period of its repair without significant renovations and costs,

F o rmula of the invention

A method for protecting coke metal from metal surfaces of reactors for high-temperature processing of hydrocarbons, including surface treatment with a solution of sulfur in an organic solvent, characterized in that, to reduce coke formation on metal surfaces, they are treated with a 3-5% solution of sulfur in toluene, and the surface is dried successively in a stream of nitrogen and hydrogen, then treat the surface with a 20–30% aqueous solution of liquid glass and dry.

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0.272 100 0.025 9.2 0.345 100 0,0007 0.20 0.320 100 0,0005 0.16

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Table continuation

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0.391,100 0.0008 0.20. 0.384 100 0.0091 2.37 0.275 100 0.0008 0.29 0.305 100 0.0003 0.01 0.396 100 0.0008 0.20 0.296 100 0.0068 2.30 0.372 100 0,0009 0.24 0.328 100 0.0007 0.21 0.268 100 0.0076 2.83 0.328 100

0.0007 0.21 0.351 100

0.0006 0.17 0.362 100

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Editor T Patrushev

Compiled by N. Ageenko

Tehred A. Kravchuk Proofreader L. Pilipenko

Order 3451/28, Circulation 462 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow., Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table continuation

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670

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0,0066 1,82 3,681,100 0,0801 2,18

Claims (2)

SUMMARY OF THE INVENTION A method of protecting against coke deposits on metal surfaces of '5 reactors for high-temperature processing of hydrocarbons, comprising treating surfaces with a solution of sulfur in an organic solvent, characterized in that, in order to reduce coke formation on metal surfaces, they are treated with a 3-5% solution sulfur in toluene, the surfaces are dried sequentially in a stream of nitrogen and hydrogen, then the surfaces are treated with a 20-30% aqueous solution of water glass and dried. Example 'Sample Sample processing conditions' Coke formation conditions Coke weight gain, Processing time, min Concentration wt.% G%, t, s Time, solution of sulfur in toluene with a solution of liquid glass of sulfur in toluene. water glass in water 1 1 2 5 10 4 2 1 - - - 2 10 10 4 3 1 - - - 2 20 · 10 4 - 650 3 0.272 100 20 0,025 9.2 - 650 3 0.345 100 20 0,0007 0.20 - 650 '3 0.320 100 20 0,0005 0.16 [riiep Sample Sample processing conditions Processing time, min The concentration of wt. X solution solution sulfur in liquid sulfur rum rum liquid toluo glass in tolu whom Le in water le glass 9 Table continuation Coke formation conditions Time, Weight gain of coke, g Z 4 1 2 60 10 4 20 650 3 0.391 0,0008 100 0.20 5 1 - - - - 0.384 100 650 3 2 ' 10 5 4 20 0.0091 2,37 • 6 1 - - - 0.275 100 650 3 2 10 10 4 20 0,0008 0.29 7 1 - - - - 0,305 100 λ 650 3 2 10 20 4 20 0,0003 0.01 8 1 - - - - 0.396 100 650 3 2 10 ⁶⁰ 4 20 0,0008 0.20 9 1 - - - - 0.296 100 650 3 2 10 10 2 20 0.0068 2,30 10 1 - - - - 0.372 100 650 3 2 10 10 3 20 0,0009 0.24 eleven " 1 - - - - 0.328 100 650 . 3 2 10 10 4 20 0,0007 0.21 12 1 - - - - 0.268 100 650 3 2 10 10 4 fifteen 0.0076 2.83 thirteen 1 - - - - 0.328 100 650 3 2 10 10 4 20 0,0007 0.21 1.4 1 - - - - 0.351 100* 650 3 2 10 10 . 4 thirty 0,0006 0.17 fifteen 1 - - - 0.362 100 II table continuation At- Sample Sample Processing Conditions Coke formation conditions Weight gain of coke measures % □ rHIMS V4Jpel W'1 J4F1 j min linceltracil wt.% about T, C Time h _____ solution of sulfur in toluene ____.1_____ liquid glass solution sulfur in toluene water glass in water 2 10 10 4 35 650 3 0.0066 1, 82 16 1 - - - - 670 100 3,681 100 2 10 10 4 20 0.0801 2.18 Compiled by N. Ageenko Editor T. Patrusheva Tehred A. Kravchuk Proofreader L. Pilipenko Order 3451/28 Circulation 462 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow., Zh-35, Raushskaya nab., 4/5 Production and printing company, Uzhhorod, st. Project, 4