FIELD: chemistry.
SUBSTANCE: present invention refers to the method of catalyst for phthalic anhydride production improvement or optimisation by the way of ortho-xilene and/or naphthalene vapour-phase oxidation. The said method includes the following stages: a) preparation of the initial catalyst containing at least the first layer positioned from the gas input side and the second layer positioned near the gas output with catalyst layers preferentially having the corresponding active mass containing the titanium oxide TiO2; b) partial change of the first layer for the catalyst prelayer having enhanced activity in order to obtain the improved catalyst. The improved catalyst obtained thereby, method for phthalic anhydride production and its application for phthalic anhydride production by the way of ortho-xilene and/or naphthalene vapour-phase oxidation are described also.
EFFECT: increase of the catalyst life cycle at constant or even increased product yield.
30 cl, 1 tbl, 1 ex
| Title | Year | Author | Number |
|---|---|---|---|
| APPLICATION OF HONEYCOMB CATALYST FOR MAKING PHTHALIC ANHYDRIDE | 2006 |
|
RU2396113C2 |
| CATALYST FOR PREPARING PHTHALIC ANHYDRIDE | 1991 |
|
RU2047351C1 |
| CATALYST FOR PREPARING PHTHALIC ANHYDRIDE | 1992 |
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| MULTILAYER CATALYST FOR PRODUCING PHTHALIC ACID ANHYDRIDE | 2005 |
|
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| CATALYST FOR OXIDIZATION OF THE VANADIUM OXIDE PARTICLES IN THE GASEOUS PHASE WITH THE CERTAIN SIZE DISTRIBUTION | 2004 |
|
RU2314867C2 |
| USING TITANIUM DIOXIDE-CONTAINING CATALYST, PARTICULARLY TO OBTAIN PHTHALIC ANHYDRIDE, METHOD OF OBTAINING CATALYST AND METHOD OF USING CATALYST | 2007 |
|
RU2434840C2 |
| CATALYST FOR PHTHALIC ANHYDRIDE SYNTHESIS | 1992 |
|
RU2054317C1 |
| CATALYST FOR OXIDIZING O-XYLENE INTO PHTHALIC ANHYDRIDE; TECHNIQUE | 1992 |
|
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