Low cost high yield Iso-octene/ Isooctane process with capability to revamp the MTBE units

Abstract

This invention covers a process for dimerizing of isobutylene to Iso-octene and unique configuration is being disclosed, where the Feed is diluted to low level with recycle which has essentially no Iso-octene, dual catalyst system, new selectivator (IPA) and successive catalyst stages if needed to enhance the conversion. The process is very selective and provides higher isobutylene conversion.Additionally the invention also covers the hydrogenation of olefins to Paraffin, Iso-octene to Iso-octane product under moderate conditions and with dual or single catalyst system.

Description

FIELD OF THE INVENTION[0001]The invention relates to producing dimer of Isobutylene especially but covers the dimerazation of Isoamylenes as well. The Isobutylene dimerization provides a dimer but some of the normal butylenes' react with iso-butylene to produces some of isomers of these dimers. This dimer which is di-isobutylene is called commonly as Iso-octene is high octane compound similar to MTBE but without the environmental problems of MTBE. The major problem is this product is essentially olefinic and when there are specification as regards to olefin than it will have to be hydrogenated to Isooctane. Most of the MTBE plants can be converted to Iso-octene with little investment but one needs some higher capital investment for hydrogenation of Is-octene to Iso-octane. Additional drawback is that the Isooctene yield compared to MTBE is reducede by about 70 percent. The art of this invention relates specifically to a new selectivator for the catalyst and also unique configuration...

AI Technical Summary

Benefits of technology

The patent describes a process for the hydrogenation of iso-octene to iso-octane using a dual catalyst system. The process includes the use of a selectivator called isopropyl alcohol (IPA) which helps to enhance the hydrogenation process. The IPA is recycled back to the reactor and combined with the unreacted iso-butylene to form a bottom product. The process is designed to have low propylene content in the feed, with the recycle stream containing low amounts of iso-octene. The recycle stream is sent to a debutanizer column to separate the iso-octene from the non-reactive components. The process provides high selectivity and yield, and the use of the selectivator helps to enhance the selectivity and life of the catalyst. The process is simple and can be easily operated and changed while the unit is in operation. The invention also covers the use of a new selectivator called isopropyl alcohol.

Problems solved by technology

In recent years due leakage of MTBE from the gas stations storage tanks, some leaks from using it in water skies in lakes, and as solubility of the MTBE in water is high, it has created controversy as regards to suitability of the ethers in gasoline especially in USA.

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