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pounds and unreactive solid oxy-compounds are listed in Table III following: 

clave runs and in •a continuous reaction unit for the d1- merization of propene. 

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Particle size of Ca,(PO$_{4}$ h too small. 

The above data considered in connection with that of Table II show that polar organic compounds are generally unsatisfactory for the production of stable alkali metal containing allyl alkylation catalysts in the absence of criti- cal amounts of sized unreactive solid oxy-compounds. This fact is even apparent for many polar compounds in a simple batch test, for the others relatively short testing under continuous allyl alkylation conditions soon estab› lishes a deficiency. Functionally, the organic compounds may be said to require a polar component capable of gen› erating a dipole moment of at least one Debye unit and preferably one having a pKa below about 28, and a hydro› carbon component, dielectric in nature, which is stable under allyl alkylation conditions. • From -the examples, it is to be seen that the hydrocarbon component may be sup› plied by a group as small as a methyl group and as large as an 18 carbon atom alkyl or alkenyl group and larger. Hydrocarbon components containing from 1 to 20 car› bon atoms per group are clearly useful. The groups may be normal alkyl, branched alkyl, cyclic, acyclic, and phenyl. 5 

Where an easy safe disposition of spent catalyst is of particular importance, catalysts prepared from alkali metal, meta- and orthosilicates, i.e., water soluble oxy› compounds and stable polar organic compounds whose hydrocarbon component contains from 1-10 carbon atoms per group, are preferred. A further advantage of these catalysts using the alkali metal solid oxy.compounds are their nonacidic nature, which appears to make them use- ful where 1-alkene product maximization is desired. 

Within a range a definite amount of a polar organic compound is required to produce stable ally! alkylation catalysts. The results listed in Table N following were obtained by preparing -the catalysts in the preferred man- ner except that the amount of the organic compound, oleic acid, was varied as indicated. For each gram atom of potassium, 13.4 cc. of a mixed silicate, a metamorphic talc, was used. The catalysts were tested in batch auto- 

## EXAMPLE4 

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These data and the data of Table III indicate that from about 1.0x,10-3 to LOX 10- 2 mols of a polar material of the molecular weight in the range of oleic acid, used in conjunction with an unreactive oxy-compound having a particle size in the range 1-10 microns, is required in the formulation of a stable allyl alkylation catalyst. In the use of polar organic compounds having smaller mo› lecular weights, for example, of the order of acetic acid up to a C$_{10 }$ carboxylic acid, whether of branched or normal carbon chain configuration, the operable amounts of polar organic compound relative to the alkali metal is some- what larger, being from about LOX 10- 3 up to about LOX 10-1 mols of -the material per gram atom of the alkali metal. These lower molecular weight materials are distinctly advantageous ()IVer the higher molecular weight materials for several reasons; among which are the absence of any tendency to produce foam and more favor• able medium viscosities. 

Particle size.-Allyl alkylation catalyst complexes pre› pared from oxy•compounds having an appreciable frac› tion of particles in sizes ranging above about 20 microns are in general unsatisfactory for use in a continuous 

## EXAMPLE 5 

