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Title Prevention of tar formation during the heating of the BTX fraction in hydropurification
Creator/Author Krichko, A.A. ; Vol-Epshtein, A.B. ; Yulin, M.K. ; Shpil`berg, M.B. ; Privalov, V.E. ; Shustikov, V.I.
Publication Date1977 Jan 01
OSTI IdentifierOSTI ID: 7092150
Other Number(s)CODEN: COKCA
Resource TypeJournal Article
Resource RelationCoke Chem., USSR (Engl. Transl.) ; Vol/Issue: 5; Translated from Koks Khim.; No. 5, 39-40(1977)
Subject010500 -- Coal, Lignite, & Peat-- Products & By-Products; ;AROMATICS-- PRODUCTION; BENZENE;CATALYSTS;COAL TAR;DEACTIVATION;DEPOSITS;HYDROGENATION;PROCESSING;TOLUENE;XYLENES
Related SubjectAROMATICS;CHEMICAL REACTIONS;HYDROCARBONS;ORGANIC COMPOUNDS;OTHER ORGANIC COMPOUNDS;TAR
Description/Abstract The BTX fraction is subjected to hydropurification for isolation of pure aromatic hydrocarbons.^The diene hydrocarbons present in the feedstock (cyclopentadiene, indene, and coumarone) have a tendency to polymerize when heated, especially at temperatures above 200/sup 0/C, forming tars that produce coke-like deposits on the heating surfaces of the heat-exchange apparatus and on the catalyst.^This disrupts normal equipment operation and inactivates the catalyst.^In order to prevent catalyst inactivation, the main stage of the hydropurification process is carried out with a stage-I reactor operating at relatively low temperature (210 to 230/sup 0/C).^Most of the diene compounds are hydrogenated here and the resultant hydrogenate contains principally monoolefins.^The latter can be heated to 500/sup 0/C without formation of high-boiling tars.^In order to isolate the tars formed during heating, the initial feedstock is evaporated in a special cascade-type unit before delivery to the stage-I reactor.^It has been shown that addition of 0.01 mass-% Ionol to the BTX fraction prevents polymerization leading to formation of tar deposits on the heating surfaces and catalyst.^Addition of this inhibitor increases heater efficiency and improves evaporation of the feedstock, simplifying the operation of the apparatus.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 53-54
System Entry Date2001 May 13

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