| 摘要 |
In the process for preparing dialkali metal (e.g. sodium, potassium or lithium) derivatives of dimers of conjugated aliphatic diolefins in an inert ether medium as described in Specification 756,385, the alkali metal is used in a finely dispersed form in which more than about 30 per cent of the particles are less than five microns in size. Preferably the average particle size is not more than 10 microns or less. The process may be carried out if desired without the use of activating agents and attrition agents as described in Specification 761,842. The reaction conditions, the nature of the ether medium and conversion of the reaction products to dicarboxylic acids are as in the prior patents. The dispersion is prepared by milling in a preheated homogenizer a dispersion of the alkali metal in an inert hydrocarbon solvent prepared by agitation in the presence of an emulsifier such as dimerized linoleic acid. Copper oleate, aluminium stearate, oleic acid, aluminium octanoate, calcium stearate, aluminium laurate, lead naphthenate, zinc stearate and lecithin may also be used. |
