RU2224735C1

RU2224735C1 - Olefin hydrocarbon production process

Info

Publication number: RU2224735C1
Application number: RU2002128898/04A
Authority: RU
Inventors: Г.Т. Щербань; Ю.И. Федотов; Н.И. Китёв; П.А. Мальковский; Л.Е. Жернаков; В.А. Ли; В.М. Никитин; И.А. Магсумов
Original assignee: Щербань Георгий Трофимович
Priority date: 2002-10-28
Filing date: 2002-10-28
Publication date: 2004-02-27

Abstract

FIELD: petrochemical processes. SUBSTANCE: paraffin hydrocarbons are dehydrogenated in fluidized bed of powder-like alumino-chromium catalyst circulating within reactor-regenerator circuit. Process comprises: preparation of mixture from forward and recycle streams of paraffin hydrocarbons; vaporization of the mixture; heating resulting vapors at the expense of contact gas heat and overheating them in furnace followed by routing them to hydrogenation; cooling contact gas in exhaust-heat boiler at the expense of water condensate vaporization and in water-irrigation scrubber; compressing cooled contact gas; condensation and rectification-mediated isolation of paraffin and olefin hydrocarbon fractions from hydrocarbon condensate utilizing heat of water steam escaping exhaust-heat boilers. In addition, contact gas temperature is further lowered to 125-180 C by cooling contact gas with water condensate on heat-exchange apparatuses installed after exhaust-heat boiler. Once obtained, hot water condensate is conveyed to feed exhaust-heat boiler and, when low-parameter water steam is obtained, it is fed on heaters of rectification columns. Cooled gas is fed into irrigation scrubber. EFFECT: lowered raw material and catalyst losses and reduced power consumption. 3 cl, 1 dwg, 10 ex

Description

Текст описания в факсимильном виде (см. графическую часть)х Description text in facsimile form (see graphic part) x

Claims

1. A method of producing olefin hydrocarbons by dehydrogenation of paraffin hydrocarbons in a fluidized bed of a dust-like alumina-chromium catalyst circulating in a reactor-regenerator system, comprising preparing a mixture of direct and recycle streams of paraffin hydrocarbons, evaporating it, heating the resulting vapors due to the heat of the contact gas and their overheating in the furnace followed by dehydrogenation, which also includes cooling the contact gas in the recovery boiler by evaporation of the water condensate and in the oro scrubber water, burning coke during oxidation of the catalyst with atmospheric oxygen in the regenerator, replenishing the regenerator with a fresh catalyst, recovering the oxidized catalyst with hydrogen-methane-containing gas, desorbing the reaction products and reducing the catalyst with inert gas, transporting the catalyst from the reactor to the regenerator and vice versa, compressing the cooled contact gas, condensation and separation of the fraction of paraffinic and olefinic hydrocarbons from hydrocarbon condensate by distillation using t rafts of water vapor taken from recovery boilers, characterized in that they reduce the temperature of the contact gas to 125-180 ° C by additional cooling with water condensate in heat exchangers installed after the recovery boiler, and when receiving hot water condensate it is sent to power the recovery boiler, and upon receipt of low-level steam, it is fed to the boilers of distillation columns, the cooled contact gas is sent to the irrigation scrubber.

2. The method according to claim 1, characterized in that the heat exchangers use a vertical type refrigerator or waste heat boilers.

3. The method according to claim 1, characterized in that the regenerator is fed with a fresh catalyst containing hexavalent chromium in an amount of 1.2-3.5 wt.%.