# US 7,608,745 B2 · Process for production of propylene and ethylbenzene from dilute ethylene streams

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- Number: US 7,608,745 B2
- Document ID: US7608745B2
- Status: Granted
- Kind: B2
- Application number: 11/981,392
- Filed: 2007-10-31
- Published: 2008-05-22
- Granted: 2009-10-27
- Earliest claimed: 2003-06-11
- Assignees: Lummus Technology Inc.
- Inventors: James M. Hildreth; Kerman Nariman Dukandar; Ronald M. Venner
- Web page: https://patentgrep.com/patent/US7608745B2

## CPC

- C07C 15/073: Ethylbenzene
- C07C 2/66: Catalytic processes
- C07C 6/00: Preparation of hydrocarbons from hydrocarbons containing a different number of carbon atoms by redistribution reactions
- C07C 6/04: at a carbon-to-carbon double bond
- C07C 11/06: Propene
- C10G 2400/20: C2-C4 olefins
- C10G 2400/30: Aromatics
- Y02P 20/10: Process efficiency
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A process for producing propylene is provided which includes directing an ethylene stream from an ethylene reaction zone to a propylene reaction zone; directing a butene stream to the propylene reaction zone; reacting the ethylene stream with the butene stream in the propylene reaction zone to produce a propylene reaction stream; and subjecting the propylene reaction stream to a recovery operation to recover propylene. A processes is also provided for producing an alkylaromatic by directing an ethylene stream from a propylene reaction zone to an alkylaromatic reaction zone; directing an aromatic stream to the alkylaromatic reaction zone; reacting the ethylene stream with the aromatic stream in the alkylaromatic reaction zone to produce an alkylaromatic reaction stream; and subjecting the alkylaromatic reaction stream to a recovery operation to recover alkylaromatics. A process for producing propylene and an alkylaromatic is also provided.

## Claims

### Claim 1

A process for producing propylene and an alkylaromatic, comprising:
a) reacting a feedstock in an ethylene reaction zone to produce a first ethylene stream from thermal cracking of hydrocarbons in the presence of steam;
b) directing the first ethylene stream to a propylene reaction zone;
c) directing a butene stream to the propylene reaction zone;
d) reacting the first ethylene stream with the butene stream in the propylene reaction zone to produce a propylene reaction stream;
e) subjecting the propylene reaction stream to a first recovery operation to recover the propylene and a second ethylene stream comprising above 60 mole percent ethylene to about 90 mole percent ethylene;
f) directing the second ethylene stream to an alkylaromatic reaction zone without recycling of any of the second ethylene stream to the propylene reaction zone;
g) directing an aromatic stream to the alkylaromatic reaction zone;
h) reacting the second ethylene stream with the aromatic stream in the alkylaromatic reaction zone to produce an alkylaromatic reaction stream; and
i) subjecting the alkylaromatic reaction stream to a second recovery operation to recover the alkylaromatic.

### Claim 2 (depends on 1)

The process of claim 1, further comprises: condensing the ethylene stream before step (b).

### Claim 3 (depends on 1)

The process of claim 1, further comprising: removing acetylene from the ethylene stream before step (b).

### Claim 4 (depends on 1)

The process of claim 1, further comprising: partially fractionating the ethylene stream before step (b).

### Claim 5 (depends on 1)

The process of claim 1, wherein the concentration of ethylene in the first ethylene stream is in the range of about 60 mol % to about 95 mol %.

### Claim 6 (depends on 5)

The process of claim 5, wherein the concentration of ethylene in the first ethylene stream is in the range of about 65 mol % to about 85 mol %.

### Claim 7 (depends on 6)

The process of claim 6, wherein the concentration of ethylene in the first ethylene stream is in the range of about 80 mol % to about 83 mol %.

### Claim 8 (depends on 1)

The process of claim 1, wherein the ethylene reaction zone comprises a thermal cracking device.

### Claim 9 (depends on 1)

The process of claim 1, wherein the propylene reaction zone comprises a metathesis or catalytic cracking reactor.

### Claim 10 (depends on 1)

The process of claim 1, wherein the alkylaromatic reaction zone comprises a fixed-bed reactor or a catalytic distillation reactor.

### Claim 11 (depends on 1)

The process of claim 1 wherein the first recovery operation comprises a fractionation column.

### Claim 12 (depends on 1)

The process of claim 1, wherein the second recovery operation comprises a fractionation column.

### Claim 13 (depends on 1)

The process of claim 1, wherein the feedstock is selected from the group consisting of ethane, propane, butane, naphtha, gas oils and hydrocracked vacuum gas oils.