# US 5,352,846 A · Process for the production of an olefin-free tert, amyl alkyl ether-rich fraction and a n-pentane rich paraffin fraction

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- Number: US 5,352,846 A
- Document ID: US5352846A
- Status: Granted
- Kind: A
- Application number: 08/142,107
- Filed: 1993-10-28
- Granted: 1994-10-04
- Earliest claimed: 1991-08-23
- Assignees: Institut Francais du Petrole
- Inventors: Patrick Sarrazin; Jean Cosyns; Alain Forestiere; Jean-Paul Boitiaux
- Web page: https://patentgrep.com/patent/US5352846A

## CPC

- C10G 69/02: plural serial stages only
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES

## Abstract

The simultaneous production of an olefin-free, tert.amyl alkyl, ether-rich fraction an n-pentane-rich paraffin fraction, wherein a charge based on isopentenes is hydrogenated (1) under appropriate conditions to bring about a distribution of the methyl butenes close to thermodynamic equilibrium and then the hydrogenation effluent is treated in an etherification zone (2).

## Claims

### Claim 1

A process for the simultaneous production of an olefin-free, tert-amyl alkyl ether-rich fraction and an n-pentane-rich paraffin fraction, comprising (a) in a first stage, hydrogenating a charge containing isopentenes (methyl butenes) cyclopentene and cyclopentadiene under hydrogenation and isomerization conditions sufficient to eliminate diolefins, cycloolefins, and straight-chain olefins and to obtain a distribution of the methyl butenes close to thermodynamic equilibrium; (b) in a second stage, feeding at least a fraction of the resultant hydrogenation effluent into an etherification zone for etherifying iso-olefins therein with an alcohol; and (c) distilling the resultant etherified stream from the etherification zone to collect (A) an olefin-free tert-amyl alkyl ether-rich fraction containing cyclopentane and (B) an n-pentane-rich fraction free of straight-chain olefins and cycloolefins.

### Claim 2 (depends on 1)

A process according to claim 1, wherein the charge is a steam cracking effluent.

### Claim 3 (depends on 1)

A process according to claim 1, wherein the hydrogenation stage (a) is performed by the passage of said charge with hydrogen and 2 to 50 ppm of at least one sulfur compound (ppm by weight sulfur based on the charge) into contact with a supported catalyst containing at least one noble metal from Group VIII at a temperature of 20.degree. to 150.degree. C. and under a pressure of 5 to 100 bar.

### Claim 4 (depends on 1)

A process according to claim 1, wherein the alcohol is methanol and the ether produced is tert-amyl methyl ether.

### Claim 5 (depends on 1)

A process according to claim 1, wherein at the end of the hydrogenation stage (a) and before the etherification stage (b), subjecting the hydrogenation effluent to fractionation to form a C.sub.5 -rich fraction and a C.sub.6+ -fraction and passing the C.sub.5 -rich fraction into the etherification zone.

### Claim 6 (depends on 3)

A process according to claim 3, wherein the charge is a steam cracking effluent.

### Claim 7 (depends on 6)

A process according to claim 6, wherein the alcohol is methanol and the ether produced is tert-amyl methyl ether.

### Claim 8 (depends on 7)

A process according to claim 7, wherein at the end of the hydrogenation stage (a) and before the etherification stage (b), subjecting the hydrogenation effluent to fractionation to form a C.sub.5 -rich fraction and a C.sub.6+ -fraction and passing the C.sub.5 -rich fraction into the etherification zone.

### Claim 9 (depends on 2)

A process according to claim 2, wherein the n-pentane rich fraction (B) is passed as a feed into the steam cracker from which the steam cracking effluent used as the charge is produced.

### Claim 10 (depends on 6)

A process according to claim 6, wherein the n-pentane rich fraction (B) is passed as a feed into the steam cracker from which the steam cracking effluent used as the charge is produced.

### Claim 11 (depends on 7)

A process according to claim 7, wherein the n-pentane rich fraction (B) is passed as a feed into the steam cracker from which the steam cracking effluent used as the charge is produced.

### Claim 12 (depends on 8)

A process according to claim 8, wherein the n-pentane rich fraction (B) is passed as a feed into the steam cracker from which the steam cracking effluent used as the charge is produced.