TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal oxide/hydroxide is an oxide/hydroxide of magnesium, calcium, strontium, barium, zinc and/or cadmium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method produces an algal biomass i.e. more readily separable from water and an aqueous phase containing organic chemicals. The method further comprises concentrating the heated algal biomass to produce a concentrated aqueous dispersion comprising a mixture of algal biomass and water. The aqueous slurry is heated at an autogenous pressure such that the aqueous slurry is maintained in the liquid phase. The aqueous slurry is heated at a pressure of 0.1-9 MPa for 1-300 minutes. The algal biomass is concentrated or separated by filtration, centrifugation or settling. The aqueous phase is extracted with an organic solvent immiscible in water. The concentrated aqueous dispersion is heated in water to supercritical temperatures. The aqueous phase, optionally following extraction to remove nitrogenous material, is heated to supercritical temperatures. The concentrated aqueous dispersion or solids obtained from the concentrated aqueous dispersion are treated with acid to recover fatty acids essentially free of nitrogenous material. Preferred Components: The aqueous slurry comprises 1-80 wt.% of algal biomass and 1-30 wt.% of separation agent. The concentrated aqueous slurry comprises at least 30-99 wt.% of algal biomass. The solvent is methylene chloride and other halogenated hydrocarbons, toluene and other aromatic hydrocarbons, petroleum spirit, esters or ethers. The organic chemical products are nitrogen heterocycles, lipid acids or hydrocarbons. The nitrogen heterocycles are indole, pyrimidine, methyl pyrazine, 2,5-dimethyl pyrazine, 2-ethyl-6-methyl pyrazine, trimethyl pyrazine, 2-ethyl-3,6-dimethyl pyrazine, 3,6-diisobutyl-2,5-piperazinedione, 2-piperidinone, 2-methyl piperidine, N-methyl-2-pyrrolidinone, N-ethyl-2-pyrrolidinone, N-butyl-2-pyrrolidinone or N-ethyl piperidine. ACTIVITY - Fertilizer.    MECHANISM OF ACTION - None given.    EXAMPLE - No suitable example given.