Process for production of xylene
AssigneeToray Industries, Inc.
InventorsHajime Kato, Hitoshi Tanaka, Kazuyoshi Iwayama, Ryoji Ichioka
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Abstract
Disclosed herein is a catalyst composition for transalkylation of alkylaromatic hydrocarbons which exhibits the percent conversion of ethyltoluene higher than 50 wt %, is composed of mordenite (100 pbw), inorganic oxide and/or clay (25-150 pbw), and at least one metal component of rhenium, platinum, and nickel, and contains mordenite such that the maximum diameter of secondary particles of mordenite is smaller than 10 μm. Disclosed also herein is a process for producing xylene by the aid of said catalyst from alkylaromatic hydrocarbons containing C9 alkylaromatic hydrocarbons containing more than 5 wt % ethyltoluene and less than 0.5 wt % naphthalene, in the presence of hydrogen.
Claims22
A process for producing xylene from alkylaromatic hydrocarbons containing C9 alkylaromatic hydrocarbons, said process comprising dealkylation to convert ethyltoluene into toluene and subsequent transalkylation to convert toluene or toluene and trimethylbenzene in the C9 alkylaromatic hydrocarbons into xylene,
- in the presence of a catalyst composition for transalkylation of alkylaromatic C9 hydrocarbons to toluene, comprising:
- (a) 100 pbw of a hydrogen-type mordenite;
- (b) at least one material selected from the group consisting of an inorganic oxide and a clay and present in an amount of 40 to 150 parts by weight per 100 parts by weight of mordenite;
- and
- (c) at least one metallic substance supported on said support material and comprising a metal or metallic compound selected from the group consisting of platinum and nickel compounds, wherein said metallic substance is provided in the following concentration ranges expressed as parts by weight (“pbw”) of the metal component per 100 parts by weight of said mordenite:
- platinum:
- not more than 0.005
- nickel:
- 0.05-1.5.
A process for producing xylene from alkylaromatic hydrocarbons containing C9 alkylaromatic hydrocarbons, said process comprising dealkylation to convert ethyltoluene into toluene and subsequent transalkylation to convert toluene or toluene and trimethylbenzene in the C9 alkylaromatic hydrocarbons into xylene,
- in the presence of a catalyst composition for transalkylation of alkylaromatic C9 hydrocarbons to toluene, comprising:
- (a) 100 pbw of a hydrogen-type mordenite;
- (b) 40-150 pbw of at least one support member selected from the group consisting of an inorganic oxide and a clay;
- and
- (c) a substance comprising rhenium, said substance being present in an amount ranging from about 0.1 to 2.0 parts by weight of said rhenium, expressed as weight of metal, per 100 parts by weight of said support member, said rhenium being present in an amount of at least 0.05 parts, expressed as metal per 100 parts of said mordenite,
- wherein said catalyst has the ability to achieve the percent conversion of ethyltoluene of higher than 50 under the following conditions:
- Ratio of ethyltoluene to (trimethylbenzene plus ethyltoluene)=35 wt %
- Reactions conditions:
- Temperature:
- 400° C. Pressure:
- 3 MPa-G WHSV (weight space velocity):
- 2.1 h−1 H2/feedstock:
- 4.0 mol/mol
- Percent conversion of ethyltoluene (wt %)=(A−B)/A×100
- where
- A:
- concentration of ethyltoluene in feedstock (wt %)
- B:
- concentration of ethyltoluene after reaction (wt %).
Dependencies are inferred from the claim text.