The way to obtain olefinic hydrocarbons

 

Use: petrochemical industry. Essence: carry out the dehydrogenation of paraffin hydrocarbons in a fluidized bed of pulverulent alimohammadi catalyst circulating in the reactor - regenerator. The method includes preparing a mixture of direct and recycle streams paraffin hydrocarbons, evaporation, heating the obtained vapor by the heat contact of gas and overheating of the furnace with subsequent referral to dehydration, cooling gas in contact HRSG due to evaporation of water and condensation in the scrubber irrigation water, compressing the cooled gas contact, condensation and separation of fractions of paraffinic and olefinic hydrocarbons from hydrocarbon condensate by distillation using heat of water vapour, taken from waste-heat boilers. This further reduces the temperature of the gas to contact 125-180oThrough its cooling water condensate in heat exchangers that are installed after the boiler. Upon receipt of hot water condensate it is sent to the power boiler, and to obtain water vapor low settings it is served on the boilers of rectifica is talesfore, reducing energy consumption. 2 C.p. f-crystals, 1 Il.

Description text in facsimile form (see graphic part)x

Claims

1. The way to obtain olefinic hydrocarbons by dehydrogenation of paraffin hydrocarbons in a fluidized bed of pulverulent alimohammadi catalyst circulating in the reactor-regenerator, comprising preparing a mixture of direct and recycle streams paraffin hydrocarbons, evaporation, heating the obtained vapor by the heat contact of gas and overheating of the furnace with subsequent referral to dehydration, which also includes contact cooling gas in the HRSG due to evaporation of water and condensation in the scrubber irrigation water, burning of coke in the process of oxidation catalyst oxygen in the regenerator, the feeding of the regenerator fresh catalyst, recovering the oxidized catalyst hydrogen-matenadarani gas, desorption of the reaction products and the recovery of the catalyst with an inert gas, the transportation of the catalyst from the reactor to the regenerator and back, compressing the cooled gas contact, condensation and separation of fractions of paraffin and reinounido of waste heat boilers, characterized in that the lower the temperature of the gas to contact 125-180Through its additional cooling water condensate in heat exchangers that are installed after the boiler, and when receiving hot water condensate it is sent to the power boiler, and to obtain water vapor low settings it is served on the boilers of distillation columns, chilled contact the gas is sent to the scrubber irrigation.

2. The method according to p. 1, characterized in that as heat exchangers use the fridge vertical type or waste heat boilers.

3. The method according to p. 1, characterized in that exercise recharge regenerator fresh catalyst containing hexavalent chromium in the amount of 1.2-3.5 wt.%.

 

Same patents:

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FIELD: hydrogenation-dehydrogenation catalysts.

SUBSTANCE: invention relates to production of olefin or diolefin hydrocarbons via dehydrogenation of corresponding paraffinic C3-C5-hydrocarbons carried out in presence of catalyst comprising chromium oxide and alkali metal deposited on composite material including alumina and aluminum wherein percentage of pores larger than 0.1 μm is 10.0-88.5% based on the total volume of open pores equal to 0.10-0.88 cm3/g. Preparation of catalyst involves treatment of carrier with chromium compound solution and solution of modifying metal, preferably sodium or sodium and cerium. Carrier is prepared by from product resulting from thermochemical activation of amorphous hydrargillite depicted by formula Al2O3·nH2O, where 0.25<n<2.0, added to homogenous mass in amount 1.0 to 99.0% using, as additional material, powdered aluminum metal, which is partly oxidized in hydrothermal treatment and calcination stages. Hydrocarbon dehydrogenation process in presence of the above-defined catalyst is also described.

EFFECT: increased activity and selectivity of catalyst.

3 cl, 2 dwg, 4 tbl, 7 ex

FIELD: petrochemical processes.

SUBSTANCE: simultaneous dehydrogenation of mixture containing alkyl and alkylaromatic hydrocarbons is followed by separating thus obtained dehydrogenated alkyl hydrocarbon and recycling it to alkylation unit. Dehydrogenation reactor-regenerator employs C2-C5-alkyl hydrocarbon as catalyst-transportation carrying medium.

EFFECT: increased process flexibility and extended choice of catalysts.

36 cl

FIELD: petrochemical processes.

SUBSTANCE: 1,3-butadiene is obtained via catalytic dehydrogenation of n-butylenes at 580-640°C and essentially atmospheric pressure while diluting butylenes with water steam at molar ratio 1:(10-12) and supplying butylenes at space velocity 500-750 h-1. Catalyst is composed of, wt %: K2O 10-20, rare-earth elements (on conversion to CeO2) 2-6, CaO and/or MgO 5-10. MoO3 0.5-5, Co2O3 0.01-0.1, V2O5 0.01-0.1, and F2O3 the balance. Once steady condition is attained, dehydrogenation is carried out continuously during all service period of catalyst.

EFFECT: increased yield of 1,3-butadiene and process efficiency.

2 ex

FIELD: hydrogenation-dehydrogenation catalysts.

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EFFECT: increased mechanical strength and stability in paraffin dehydrogenation process.

9 cl, 1 dwg, 3 tbl, 7 ex

FIELD: petroleum chemistry, chemical technology.

SUBSTANCE: invention relates to dehydrogenation of isoamylenes to isoprene on iron oxide self-regenerating catalysts. Method involves addition of piperylenes in the concentration up to 4 wt.-% representing a by-side product in manufacturing process of isoprene by the indicated method to the parent isoamylenes before their dehydrogenation. Method provides enhancing selectivity of method for isoamylenes dehydrogenation to isoprene in the presence of iron oxide self-regenerating catalysts.

EFFECT: improved preparing method.

1 tbl, 6 ex

FIELD: chemistry of aromatic compounds, chemical technology.

SUBSTANCE: process involves the following stages: feeding (C2-C5)-alkane, for example, ethane and (C2-C5)-alkyl-substituted aromatic compound, for example, ethylbenzene into dehydrogenation reactor for the simultaneous dehydrogenation to (C2-C5)-alkene, for example, to ethylene, and (C2-C5)-alkenyl-substituted aromatic compound, for example, styrene; separation of the outlet dehydrogenation flow for extraction of gaseous flow containing alkene, hydrogen and alkane, and for extraction of aromatic compounds with the high effectiveness by cooling and compression; feeding a gaseous flow and (C6-C12)-aromatic compound into the alkylation reactor for preparing the corresponding (C2-C5)-alkyl-substituted aromatic compound that is recirculated into the dehydrogenation reactor; feeding the blowing flow from the alkylation unit containing alkane and hydrogen for the separation stage by using cryogenic separator for extraction of alkane that is recirculated into the dehydrogenation reactor, and hydrogen that is extracted with the purity value 99%. Invention provides the development of economic and highly effective process for preparing alkenyl-substituted aromatic compounds.

EFFECT: improved preparing method.

61 cl, 2 tbl, 2 dwg, 2 ex

FIELD: petroleum chemistry, organic chemistry, chemical technology.

SUBSTANCE: method involves contacting the parent raw flow in the flow-type reactor with oxygen-free gas flow at increased temperature with a catalyst comprising a precious metal of VII group of the periodic system of elements. The industrial isomerization platinum-containing catalyst SI-1 or industrial hydrogenation catalyst "palladium on active aluminum oxide in sulfured form" is used as a catalyst. Contact of the parent raw with catalyst is carried out by its feeding in inert gas flow, for example, nitrogen at the volume rate 1-2 h-1 at temperature 320-370°C in the presence of the additive representing a solution of hydroquinone or p-benzoquinone in isopropyl alcohol and taken in the concentration 0.01-0.5 mole/l wherein the additive is fed to the parent raw flow in the amount 5-30 vol.%. Invention provides carrying out the highly selective isomerization and cyclization of light petroleum fractions in on industrial Pt- and/or Pd-containing catalysts with the high yield of the end products no containing aromatic compounds and not requiring the presence of hydrogen or hydrogen-containing gas for its realization and regeneration of the catalyst.

EFFECT: improved method for isomerization.

4 cl, 2 tbl, 2 ex

FIELD: hydrogenation-dehydrogenation catalysts.

SUBSTANCE: invention provides catalytic composition for dehydration of alkylaromatic hydrocarbons optionally combined with ethane comprising: carrier consisting of alumina in δ phase or in θ phase, or in mixed δ+θ or θ+α, or δ+θ+α phase, modified with silicon oxide and having surface area less than 150 m2/g as measured by BET method; 0.1-35% gallium in the form of Ca2O3; 0.01-5% manganese in the form of Mn2O3; 0-100 ppm platinum; and 0.05-4% alkali or alkali-earth metal oxide, all percentages being based on the total weight of composition. Other variants of composition are also covered by invention. Methods of preparing such catalytic composition (options) envisage use of alumina-based carrier in the form of particles corresponding to group A of the Geldart Classification. Process of dehydration of alkylaromatic hydrocarbons optionally combined with ethane comprises: (i) dehydration of hydrocarbon stream optionally mixed with inert gas in fluidized-bed reactor in presence of catalytic composition consisted of alumina-supported and silica-modified gallium and manganese at temperature within a range of 400 to 700°C, total pressure within a range of 0.1 to 3 atmospheres, and gas hourly space velocity from 50 to 10000 h-1; and (ii) regeneration and heating of catalyst caused by catalytic oxidation of fuel in fluidized-bed reactor at temperature above 400°C.

EFFECT: increased activity of catalytic composition and prolonged lifetime thereof.

22 cl, 2 tbl, 16 ex

FIELD: organic chemistry, chemical technology, catalysts.

SUBSTANCE: invention describes a catalyst for dehydrogenation of (C2-C5)-hydrocarbons that comprises aluminum, chrome oxides, compound of modifying metal, alkaline and/or alkaline-earth metal. Catalyst comprises additionally silicon and/or boron compounds and as a modifying agent the proposed catalyst comprises at least one compound chosen from the following group: zirconium, titanium, iron, gallium, cobalt, molybdenum, manganese, tin. The catalyst is formed in the process of thermal treatment of aluminum compound of the formula Al2O3. n H2O wherein n = 0.3-1.5 and in common with compounds of abovementioned elements and shows the following composition, wt.-% (as measure for oxide): chrome oxide as measured for Cr2O3, 12-23; compound of a modifying metal from the group: Zr, Ti, Ga, Co, Sn, Mo and Mn, 0.1-1.5; silicon and/or boron compound, 0.1-10.0; alkaline and/or alkaline-earth metal compound, 0.5-3.5, and aluminum oxide, the balance. Catalyst shows the specific surface value 50-150 m2/g, the pore volume value 0.15-0.4 cm3/g and particles size 40-200 mcm. Also, invention describes a method for preparing this catalyst. Invention provides preparing the catalyst showing the enhanced strength and catalytic activity.

EFFECT: improved and valuable properties of catalyst.

12 cl, 2 tbl

FIELD: petrochemical industry; methods of production of styrene.

SUBSTANCE: the invention is pertaining to the field of petrochemical industry, in particular, to the method of production of styrene. The invention provides for dehydrogenation of the ethylbenzene charge gained after mixing of the fresh ethylbenzene with the recycled ethylbenzene on the ferrioxide catalytic agent at presence of the steam at the mass ratio of the raw to the steam of no less than 1:2, at the temperature of 580-640°С and the volumetric speed of feeding of the ethylbenzene charge of 0.23-0.45 m3/h. The hydrocarbon condensate (the product of the dehydrogenation) containing styrene, the unreacted ethylbenzene, the by-products including the phenyl acetylene impurity before the stage of the rectification is hydrogenated using the palladium-containing catalytic agents at the temperature of 20-30°С, the volumetric speed of 4.5-5.0 m3/h-1 and at the volumetric ratio of the hydrogen : raw - 35-45. The technical result of the invention is the increased purity of the produced styrene without reduction of productivity of the whole process of the marketable styrene.

EFFECT: the invention ensures the increased purity of the produced styrene without reduction of productivity of the whole process of the marketable styrene.

1 tbl, 8 ex

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