Process for producing catalyst for methacrylic acid...

Details Process for producing catalyst for methacrylic acid... Process for producing catalyst for methacrylic acid...

2004-10-27

2010-02-16

Puttlitz, Karl J (Department: 1621)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Phosphorus or compound containing same

C502S209000, C502S210000, C502S211000, C502S212000, C502S213000, C502S305000, C502S308000, C502S311000, C502S317000, C502S319000, C502S321000, C502S324000, C502S325000, C502S344000, C502S345000, C502S353000, C502S355000

Reexamination Certificate

active

07662742

ABSTRACT:
A method for producing a catalyst containing given atoms in a given atomic proportion for use in producing methacrylic acid through gas-phase catalytic oxidation of methacrolein with molecular oxygen comprising the steps of:(i) preparing a solution or slurry containing at least molybdenum, phosphorus, and vanadium (liquid I);(ii) preparing a solution or slurry containing ammonium radical (liquid II);(iii) preparing a mixture of the liquid I and the liquid II by introducing one liquid (liquid PR) of the liquid I and the liquid II into a tank (tank A) and pouring the other liquid (liquid LA) on a continuous region in the surface of the liquid PR, the continuous region occupying 0.01 to 10% of the whole area of the surface of the liquid PR; and(iv) drying and calcining the resultant solution or slurry containing a catalyst precursor comprising all the catalyst constituents.

REFERENCES:
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U.S. Appl. No. 11/631,107, filed Dec. 28, 2006, Fukui, et al.

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