Global Patent Index - EP 0949317 A1

EP 0949317 A1 19991013 - Process for the isomerisation of gasolines with high benzene content

Title (en)

Process for the isomerisation of gasolines with high benzene content

Title (de)

Verfahren zur Isomerizierung von Benzinen mit hohem Benzolgehalt

Title (fr)

Procédé f d'isomérisation d'essences à teneur élevée en benzène

Publication

EP 0949317 A1 19991013 (FR)

Application

EP 99400568 A 19990309

Priority

FR 9803958 A 19980331

Abstract (en)

Upstream of the reactor a balance fluid is introduced, which, at 40 degrees C and atmospheric pressure, is a gas and has a density less than or equal to that of pentane under the same conditions. The paraffins have 5 or 6 atoms and more than 2 wt.% benzene, in which the load is passed through a reactor (5) containing an isomerization catalyst in the presence of hydrogen, at a total pressure greater than 10 x 10<5> Pa (10 bars) and a mean temperature of 100-200 degrees C. The balance fluid is injected immediately upstream of the first isomerization reactor, at a level in the introduction zone where the fluids are mixed, at mid- height of the catalyst bed (6), and after preheating of the reaction mixture and before injecting the mixture into the reactor. The balance fluid contains a substantial quantity of hydrogen and/or hydrocarbons with 1-5 (or 1-4) C. The fluid also contains a small quantity of hydrocarbons with 6 or 7 C and/or inert gases such as nitrogen or other appropriate light fluid. The fluid contains a substantial quantity of the light components from a fractionating column (20) for the effluents from the isomerization unit. The composition and/or flow rate of the balance fluid is optimized as a function of the characteristics of the load to be treated, in particular its benzene content. The balance fluid is injected at a rate of 5-150 Nm<3>/m<3> of load, preferably 5-60 Nm<3>/m<3> of load, and at a temperature less than or equal to that of the reactants, preferably 20-180 degrees C. The isomerization unit contains several reactors in series (5, 8) and a section rich in non-isomerized paraffins with 5 or 6 C containing naphthenes, is separated from the effluent of the isomerization unit and is recycled immediately downstream of the first reactor. Independent claims are included for: (i) the apparatus for the above process; and (ii) the use of the unit to isomerize light petrols from catalytic cracking, on their own or part of a mixture.

Abstract (fr)

L'invention concerne un procédé d'isomérisation d'une charge hydrocarbonée contenant une quantité substantielle d'hydrocarbures paraffiniques à 5 ou 6 atomes de carbone et du benzène à une teneur supérieure ou égale à 2 % en poids, dans lequel la charge à traiter passe, en présence d'hydrogène, à une pression totale supérieure ou égale à 10.10<5> Pa (10 bars) et à une température moyenne comprise entre 100 et 200°C, dans au moins un réacteur (5) contenant un catalyseur. Selon l'invention, on introduit, dans la partie amont de la zone réactionnelle, un fluide d'appoint qui, à 40°C et sous pression atmosphérique (1,0134.10<5> Pa), se trouve à l'état gazeux et possède une densité inférieure ou égale à celle du normal-pentane considéré dans les mêmes conditions. <IMAGE>

IPC 1-7

C10G 45/58; C10G 65/08

IPC 8 full level

C10G 49/02 (2006.01); C10G 45/58 (2006.01); C10G 65/08 (2006.01)

CPC (source: EP US)

C10G 45/58 (2013.01 - EP US); C10G 2400/02 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

DOCDB simple family (publication)

US 2002139712 A1 20021003; US 6881385 B2 20050419; AT E267239 T1 20040615; DE 69917363 D1 20040624; DE 69917363 T2 20050512; EP 0949317 A1 19991013; EP 0949317 B1 20040519; ES 2221327 T3 20041216; FR 2776667 A1 19991001; FR 2776667 B1 20000616; JP 4112114 B2 20080702; JP H11323356 A 19991126; US 6416657 B1 20020709; ZA 992450 B 19991001

DOCDB simple family (application)

US 10747702 A 20020328; AT 99400568 T 19990309; DE 69917363 T 19990309; EP 99400568 A 19990309; ES 99400568 T 19990309; FR 9803958 A 19980331; JP 9214899 A 19990331; US 28244299 A 19990331; ZA 992450 A 19990330