# US 7,744,750 B2 · Process for reducing Bromine Index of hydrocarbon feedstocks

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- Number: US 7,744,750 B2
- Document ID: US7744750B2
- Status: Granted
- Kind: B2
- Application number: 11/282,002
- Filed: 2005-11-17
- Published: 2007-05-17
- Granted: 2010-06-29
- Earliest claimed: 2005-11-17
- Assignees: ExxonMobil Chemical Patents Inc.
- Inventors: Stephen H. Brown; James R. Waldecker; Khavinet Lourvanij
- Web page: https://patentgrep.com/patent/US7744750B2

## CPC

- C07C 7/13: by molecular-sieve technique
- C10G 29/16: Metal oxides
- C10G 2300/1096: Aromatics or polyaromatics
- C10G 2300/20: Characteristics of the feedstock or the products
- C10G 2300/4018: Spatial velocity, e.g. LHSV, WHSV
- C10G 2300/4081: Recycling aspects
- C10G 2300/701: Use of spent catalysts
- 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

## Abstract

This invention relates to a process for reducing the Bromine Index of a hydrocarbon feedstock having less than 5 wppm oxygenates-oxygen, comprising the step of contacting the feedstock with a catalyst at conversion conditions to form a first effluent, wherein the catalyst includes a molecular sieve having a zeolite structure type of MWW.

## Claims

### Claim 1

A process for reducing the Bromine Index of an aromatic hydrocarbon feedstock, comprising the steps of:
(a) pretreating said feedstock with a catalyst or absorbent to reduce oxygenates-oxygen in said feedstock to less than 5 wppm; and
(b) contacting said pretreated feedstock with a catalyst to form a first effluent,
wherein said catalyst in step (b) includes a molecular sieve having a zeolite structure type of MWW;
then
(c) passing said first effluent from step (b) to a para-xylene production process.

### Claim 2 (depends on 1)

The process according to claim 1, wherein said material of step (a) comprises at least one of silica, alumina, silica-alumina, high surface area carbon, molecular sieve, zeolite, and clay.

### Claim 3 (depends on 1)

The process according to claim 1, wherein said feedstock has at least 95 wt. % of C6-C7 aromatics.

### Claim 4 (depends on 1)

The process according to claim 1, wherein said feedstock has at least 98 wt. % of benzene.

### Claim 5 (depends on 1)

The process according to claim 1, wherein said molecular sieve having a zeolite structure type of MWW comprises at least one of MCM-22, MCM-49, MCM-56, and ITQ-1.

### Claim 6 (depends on 1)

The process according to claim 1, wherein said molecular sieve comprises a spent molecular sieve.

### Claim 7 (depends on 1)

The process according to claim 1, wherein said catalyst further comprises a clay.

### Claim 8 (depends on 1)

The process according to claim 1, wherein said feedstock has a Bromine Index of at least 5.

### Claim 9 (depends on 1)

The process according to claim 1, further comprising a step of recycling at least a portion of said first effluent to step (b).

### Claim 10 (depends on 1)

The process according to claim 1, further comprising a step of recycling at least a portion of said first effluent to step (a).

### Claim 11 (depends on 1)

The process according to claim 1, wherein said first effluent has less than 5 wppm of dienes.

### Claim 12 (depends on 1)

The process according to claim 1, wherein said conversion conditions comprise a temperature range from about 150° C. to about 270° C., a pressure range from about 136 kPa-a to about 6996 kPa-a, and a WHSV from about 0.2 hr−1 to about 100 hr−1.

### Claim 13 (depends on 1)

The process according to claim 1, further comprising a step of regenerating said catalyst with an oxidative agent under regeneration conditions having a temperature range of about 30 to 900° C., a pressure range of about 10 to 20000 kPa-a, and a WHSV from about 0.1 hr−1 to about 1000 hr−.

### Claim 14 (depends on 1)

The process according to claim 1, further comprising a step of rejuvenating said catalyst with a reductive agent under rejuvenation conditions having a temperature range of about 30 to 900° C., a pressure range of about 10 to 20000 kPa-a, and a WHSV from about 0.1 hr−1 to about 1000 hr−1.

### Claim 15 (depends on 1)

The process according to claim 1, wherein said feedstock has a flowrate of at least 100 kg per day.

### Claim 16 (depends on 1)

The process according to claim 1, wherein said first effluent has less than 5 wppm of dienes.