# US 10,307,742 B2 · Beta zeolite catalyst for preparation of mixture of BTEX (benzene, toluene, ethylbenzene, xylene) from poly aromatic hydrocarbons and preparation method thereof

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- Number: US 10,307,742 B2
- Document ID: US10307742B2
- Status: Granted
- Kind: B2
- Application number: 15/272,687
- Filed: 2016-09-22
- Published: 2017-04-13
- Granted: 2019-06-04
- Earliest claimed: 2015-10-07
- Assignees: Korea Research Institute of Chemical Technology
- Applicants: Korea Research Institute of Chemical Technology
- Inventors: Jeong-Rang Kim; Soon Yong Jeong; Chul Ung Kim; Tae Wan Kim; Youjin Lee; Eun Sang Kim; Joo Wan Kim
- Web page: https://patentgrep.com/patent/US10307742B2

## CPC

- B01J 29/7815: {Zeolite Beta}
- C07C 4/06: Catalytic processes {(C07C4/025 takes precedence)}
- C10G 45/64: containing crystalline alumino-silicates, e.g. molecular sieves
- C07C 2529/78: containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- C10G 2400/30: Aromatics
- Y02P 20/52: using catalysts, e.g. selective catalysts
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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 beta zeolite catalyst for the preparation of a BTEX (benzene, toluene, ethylbenzene, xylene) mixture from polyaromatic hydrocarbons and a preparation method of the same are disclosed. The beta zeolite catalyst demonstrates high conversion of polyaromatic hydrocarbons and high BTEX production yield by containing optimum contents of the group VIB metals and cocatalysts, so that it can be effectively used as a beta zeolite catalyst for the production of BTEX.

## Claims

### Claim 1

A beta zeolite catalyst for preparing BTEX from polyaromatic hydrocarbons comprising 1-methylnaphthalene, which comprises a beta zeolite, tungsten, and one cocatalyst selected from the group consisting of phosphorus and aluminum, wherein a content of the tungsten is about 1.1 mmol in 1 g of the beta zeolite catalyst, and a content of the cocatalyst is 0.18-0.37 mmol in 1 g of the beta zeolite catalyst.

### Claim 2 (depends on 1)

The beta zeolite catalyst for the preparation of BTEX from polyaromatic hydrocarbons according to claim 1, wherein the beta zeolite comprises SiO2 and Al2O3 at a molar ratio of 25-60:1.

### Claim 3 (depends on 1)

The beta zeolite catalyst for the preparation of BTEX from polyaromatic hydrocarbons according to claim 1, wherein the tungsten is included in a form of a sulfide.

### Claim 4 (depends on 1)

A method for preparing the beta zeolite catalyst of claim 1 comprising the following steps:
calcinating a beta zeolite;
preparing a precursor solution by mixing a tungsten precursor and one cocatalyst precursor selected from the group consisting of a compound containing phosphorus and a compound containing aluminum;
impregnating the calcinated beta zeolite with the precursor solution to obtain an impregnated beta zeolite; and
drying and calcinating the impregnated beta zeolite to obtain the beta zeolite catalyst.

### Claim 5 (depends on 4)

The method for preparing the beta zeolite catalyst according to claim 4, wherein the tungsten precursor is selected from the group consisting of ammonium metatungstate hydrate and tungstic acid.

### Claim 6 (depends on 4)

The method for preparing the beta zeolite catalyst according to claim 4, wherein when the cocatalyst is phosphorus, the cocatalyst precursor is selected from the group consisting of phosphoric acid, meta phosphoric acid, and dibutyl phosphate.

### Claim 7 (depends on 4)

The method for preparing the beta zeolite catalyst according to claim 4, wherein the beta zeolite catalyst is additionally treated by sulfidation.

### Claim 8 (depends on 1)

A method for preparing BTEX from polyaromatic hydrocarbons comprising reacting polyaromatic hydrocarbons in a presence of the beta zeolite catalyst of claim 1 to produce said BTEX,
wherein the polyaromatic hydrocarbons comprise 1-methylnaphthalene.

### Claim 9 (depends on 8)

The method for preparing BTEX from polyaromatic hydrocarbons according to claim 8, wherein reacting the polyaromatic hydrocarbons is performed at a temperature of 300-500° C.

### Claim 10 (depends on 8)

The method for preparing BTEX from polyaromatic hydrocarbons according to claim 8, wherein reacting the polyaromatic hydrocarbons is accomplished by a selective ring-opening reaction.