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Solid acid ammonium terephthalates were synthesized. Their structure and IR spectrum were shown to remain unchanged at nitrogen contents down to 3.48 wt %, indicating the existence of a compound of variable composition with the general formula (NH4)xH2 – x(OOCC6H4COO) (x= 0.4–1.7).

Lithium-manganese oxide spinel LiMn2O4 was synthesized in hydrothermal conditions (400°C, 20 MPa) in the course of thermovaporous treatment mixtures of MnO2 and LiOH/or Li2CO3. The conditions of synthesis of the spinel as monophase product were determined. The obtained product has been characterized by means of various physical and chemical methods. The spinel has been used for manufacturing cathodes of rechargeable lithium cells. The cells discharged in the potential range 2.8-3.5 V. The specific capacity was 100-140mAh/g.

Analytical expressions are obtained for the longitudinal temperature profiles of the wall and the stream of cryogen during the cooling of a cryogenic pipeline. A comparison of the calculated data with experiment gives their good agreement.

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