GB1374282A - Process for the production of phthalic anhydride - Google Patents
Process for the production of phthalic anhydrideInfo
- Publication number
- GB1374282A GB1374282A GB4772871A GB4772871A GB1374282A GB 1374282 A GB1374282 A GB 1374282A GB 4772871 A GB4772871 A GB 4772871A GB 4772871 A GB4772871 A GB 4772871A GB 1374282 A GB1374282 A GB 1374282A
- Authority
- GB
- United Kingdom
- Prior art keywords
- naphthalene
- orthoxylene
- catalyst
- weight
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
- C07C51/313—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting with molecular oxygen
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Furan Compounds (AREA)
- Catalysts (AREA)
Abstract
1374282 Phthalic anhydride KOPPERS CO Inc 13 Oct 1971 [16 Oct 1970] 47728/71 Heading C2C Phthalic anhydride is obtained by oxidation of naphthalene or ortho-xylene by passing, at elevated temperature and pressure, a mixture of oxygen-containing gas and naphthalene or ortho-xylene through a bed of an appropriate catalyst to fluidize the catalyst, wherein (1) the contact ratio, (i.e. the weight of naphthalene or orthoxylene per weight of catalyst in a reactor at any given moment), of naphthalene or orthoxylene to catalyst is at least 4À0 Î 10<SP>-4</SP>, (2) the ratio of oxygen to naphthalene or orthoxylene is within the range of from 1À4 : 1 to 2À0 : 1 by weight, and (3) the naphthalene or orthoxylene loading is within the range of from 0À08 to 0À50 pounds of naphthalene, or orthoxylene, per hour per pound of fluidized catalyst. The process is suitably effected at a temperature of 320-400‹ C., a pressure of at least 25 p.s.i.g., preferably 38-500 p.s.i.g., and with the use of a catalyst which is, in the case of naphthalene being employed as starting material, vanadium pentoxide supported on silica gel. The oxygencontaining gas may be air, in which case the air to naphthalene or orthoxylene weight ratio should be within the range of from 6À0 : 1 to 8À5 : 1, oxygen-enriched air, and/or recycled tail gas plus air. A suitable form of apparatus for carrying out the process is described in a flow diagram.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8133470A | 1970-10-16 | 1970-10-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1374282A true GB1374282A (en) | 1974-11-20 |
Family
ID=22163518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4772871A Expired GB1374282A (en) | 1970-10-16 | 1971-10-13 | Process for the production of phthalic anhydride |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA963473A (en) |
| GB (1) | GB1374282A (en) |
-
1971
- 1971-06-07 CA CA114,996A patent/CA963473A/en not_active Expired
- 1971-10-13 GB GB4772871A patent/GB1374282A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA963473A (en) | 1975-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |