TH12432B - Minimizing the deactivation of the ether synthesis catalyst. - Google Patents

Abstract

The method for the production of alkylterchery alkyl ethers consists of delivering a feed containing including ivoolifin, alcohol and dialkyl sulfide into the feed zone. of the reactor, feed contact with reacting material in the reaction zone and isoolifin-alcohol catalysis under conditions where Support for the desired ether formation and inhibition of dialkyl sulfide reaction with catalyst materials.

Claims (24)

1. The method for producing alkyltersia alkyl ethers consists of: (a) supplying a feed current consisting of isoolefins, alcohols, and dialkyl sulfide to the reactor; (b) causing this feed current to undergo a catalytic reaction in the aforementioned reactor containing an acidic resin catalyst under reaction conditions conducive to the formation of the resulting ether, and generating a discharge current from the reactor consisting of the resulting ether, the inactive isoolefins, and the aforementioned alcohols; (c) feeding the discharge current from the aforementioned reactor into a distillation column containing a catalytic distillation reaction zone containing an acidic resin catalyst to separate the resulting ether from the inactive isoolefins and the aforementioned alcohols; and (d) preparing at least 45% by weight of the discharge current from the aforementioned reactor into the catalytic distillation reaction zone of selective oxygenates from the group of ether-alcohols and a mixture of ether-alcohols to suppress the dialkyl reaction. Sulfite is catalyzed by the aforementioned acidic resin in the reaction zone of the catalytic distillation. 2. The method prescribed under claim 1 herein shall provide that the alkyl sulfide shall be present in an amount up to approximately 4% by weight in the discharge stream from the aforementioned reactor in the reaction zone of the catalytic distillation described above. 3. The method prescribed under claim 2 herein shall provide for the presence of the alkyl sulfide in an amount up to 50 parts per million in the discharge stream from the aforementioned reactor in the reaction zone of the catalytic distillation described above. 4. The method prescribed under claim 3 herein shall provide for the presence of the alkyl sulfide in an amount up to 10 parts per million in the discharge stream from the aforementioned reactor in the reaction zone of the catalytic distillation described above. 5. The method is as prescribed under Claim 1, whereby the alcohol is methanol and the ether obtained is methyl teresiary butyl ether. 6. In accordance with the method prescribed under Claim 1, the aforementioned isolefins were selected from a group consisting of isobutylene and isoamiline. 7. The method prescribed under claim 6 herein, the alcohols are selected from a group consisting of methanol and ethanol. 8. The method prescribed under claim 7 herein, the obtained ether was selected from a group consisting of methyl tertiary butyl ether, ethyl tertiary butyl ether, tertiary amyl methyl ether, and tertiary amyl ethyl ether. 9. As defined in claim No. 2 herein, the acidic resin catalyst in the reaction zone of the aforementioned catalytic distillation is a cation exchange resin catalyst. 10. The method as defined in claim 9 herein, the cation exchange resin catalyst is a large-chain sulfonic acid cation exchange resin catalyst. 11. The method prescribed under Claim 1 herein shall be used to select the ethers obtained from a group consisting of methyl tertiary butyl ether and tertiary amyl methyl ether. 12. In accordance with the method prescribed by claim No. 11 herein, the ether received is ethresiary emil methyl ether. 13. The method prescribed under Claim 1 herein, for which the alcohols are selected is from a group comprising C3 alcohol, C4 alcohol, C5 alcohol, ethanol, and methanol. 14. The method prescribed under claim 13 herein refers to the alcohol as methanol. 15. The method prescribed under Claim 1 herein applies to the aforementioned dialkyl sulfide, which is a dimethyl sulfide. 16. In accordance with the procedure set forth in claim 15 herein, the aforementioned isolefins and the aforementioned alcohols in the feed stream are isobutene and methanol, respectively, and the received ether is methyl teresiary butyl ether. 17. In accordance with the method prescribed under claim 16 herein, the methanol shall be available in a stoichiometric quantity for the reaction with the aforementioned isobutene. 18. The method provided for under claim 17 herein shall allow the dimethyl sulfide to be present in an amount up to approximately 4% by weight in the feed current. 19. The method provided for under claim 17 herein shall allow the dimethyl sulfide to be present in an amount up to approximately 50 parts per million in the feed stream. 20. The method prescribed under claim 2 herein, the acidic resin catalyst in the reaction field reactor of the aforementioned catalytic distillation, is used as a catalyst for the cation exchange resin. 21. The method as defined in claim 20 herein, the catalytic material of the said cation exchange resin in the reaction field reactor with the catalytic material described above is a catalyst for the sulfonic acid-modified large-network cation exchange resin. 22. The method prescribed by Claim 1 herein for the provision of such oxygen consists of combining such oxygenate with the stream discharged from the aforementioned reactor to form a mixture of oxygenate and stream discharged from the reactor and inducing this mixture into the feed zone of the reaction zone of the catalytic distillation herein. 23. In accordance with the method set forth in Claim 22 herein, the oxygenate is prepared by select members from a pool of newly supplied oxygenates, recycled oxygenates recovered as a byproduct of catalytic distillation, and a mixture of newly supplied and recycled oxygenates. 24. The method prescribed by Claim 23 herein is to select the ether from a group consisting of methyl tertiary butyl ether and tertiary amyl methyl ether.