SU168661A1 - - Google Patents

Description

The known methods of hydrotreatment of hydrocarbons boiling B within the range of 50–208 ° C, from thermally unstable and sulfur-containing compounds in one step on hydrogenation catalysts, for example metals of the 8th group on the carrier, or simply by heat treatment under pressure to remove polymerizing components do not allow high purity product. In addition, the process catalyst is rapidly coked.

To increase the service life of the catalyst and increase the purity of the product, a three-stage catalytic method for hydrotreating hydrocarbons is proposed. At the first stage of purification, raw materials containing polymerizable and sulfur-containing components are fed at a temperature of 45-100 ° C and a pressure of 10-200 at a catalyst containing an 8th group metal, such as nickel, palladium, and hydrotreated from unstable components in a liquid phase with the addition of a portion of the gas required for the process. At the second stage of hydrotreatment, hydrogenation at a temperature of 200-250 ° C is fed to a catalyst consisting of nickel sulfide and tungsten. And at the third stage, the purification is carried out at a temperature of 300-400 ° C on a catalyst consisting of nickel oxide

molybdenum on a carrier or cobalt oxide and molybdenum oxide on a carrier.

Example. 1.6 kg / hour of sulfur-containing pyrolysis gasoline rich in aromatics is heated together with 200 liters / hour of hydrogen-containing gas under a pressure of 100 at 45 ° C and passed over 0.6 l of a catalyst consisting of palladium and a-alumina as a carrier. Bromine number of gasoline in

In this case, it decreased to 35 g of Br / 100 g. The content of styrene decreased from 3.65 to 0.9%, and the content of cyclopentadiene and dicyclopentadiene from 3.6 to 0.8 ° / o. The product is further heated to 200 ° C and at this temperature evaporates in an evaporator operating under pressure, with a countercurrent from 3 preheated hydrogen-containing gas. About 10% of the above boiling fractions are removed as a bottoms residue continuously through the bottom of the evaporator. The mixture of hydrogenation gas and vapor-gasoline released through the slit is passed at a temperature of 200 ° C over 0.6 liters of catalyst consisting of nickel sulphide and tungsten sulphide. The content of styrene and gasoline is reduced to 0.1%. Cyclopentadiene and dicyclopentadiene cannot be determined. The bromine number is only 23 g of Br / 100 g. The stabilized mixture of gas and steam is heated to 340 ° C.

the nickel oxide, molybdenum oxide and alumina oxide are freed from the remaining contaminants with olefins, sulfur compounds and nitrogen compounds. The sulfur content in the raffinate is 0.002o / o wt., In the raw product 0.250 / 0 weight.

Subject invention

The method of catalytic hydrotreatment of carbon species thrown in the range of 50-208 ° from thermally unstable and sulfur-containing compounds, characterized in that, in order to increase the period of continuous operation of the installation and improve the quality of the obtained

product, the process is carried out in three stages, the first of which is the catalytic hydrogenation of raw materials in the liquid phase on hydrogenation catalysts, including metal of the 8th group, for example nickel, and pressure from 10 to 200 atm, the second is hydrogenation of hydrogenate a catalyst consisting of nickel sulphide and tungsten at a temperature of 200-250 ° C, with further hydrogenation in the 3rd stage of the obtained product at a temperature of 300-400 ° C on catalysts consisting of nickel oxide, supported molybdenum oxide, or oxide cobalt and molybdenum oxide on ositele.