TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Apparatus: (A1) comprises heater for preheating (g1). The supplier for (g1) and (g3) are connected with a single source of (g1). The supplier of (g3) is arranged at a location of the reactor where formation of methanol and formaldehyde is substantially completed. (A1) further comprises device for regulating a quantity of the supplied (g1) so as to produce methanol and formaldehyde; cooler for cooling a reaction mixture which is received from the reactor including a heat-exchanger for heat exchanging between the reaction mixture which left the reactor and the separated methanol-containing fraction; and device for separating from the cooled reaction mixture, (g1) for supplying back to the source, and a methanol-containing fraction for obtaining methanol from the methanol-containing fraction. The cooler for cooling the reaction mixture received from the reactor includes the heat exchanger and device for a subsequent air-cooling.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: (P1) involves performing the reaction in a homogenous phase by a partial combustion without presence of a heterogeneous catalyst; and preheating (g1) before the supplying it into the reactor. The supplying of (g1) and (g3) includes taking (g1) from a single source, heating one portion of (g1) taken from the source to produce the heated (g1) for supplying into the reactor; and supplying another portion of (g1) from the same source as the cold (g1) into the reactor. (g3) is supplied at the stage when formation of methanol and formaldehyde is substantially completed. The quantity of the cold hydrocarbon-containing gas is regulated so as to produce a desired quantity of methanol and formaldehyde in the reactor. (P1) further involves cooling a reaction mixture, which is received from the reactor and separating from the cooled reaction mixture (g1) for supplying back to the source, and a methanol-containing fraction for obtaining methanol. The cooling of the reaction mixture includes a heat-exchange between the reaction mixture, which left the reactor and the separated methanol-containing fraction. The cooling of the reaction mixture received from the reactor includes cooling of the reaction mixture by the heat exchange and a subsequent air-cooling. EXAMPLE - A methanol was prepared either without cooling (comparative) or with cooling (test) operation of the apparatus with the capacity of 6,000 t/year, with cooling of the reaction mixture by 30degreesC. The reaction conditions for (comparative/test) were as follows: Natural gas supply (m3/hour (kg/hour)) 56800(40570)/60208(43004); Gas consumption in reaction (m3/hour (kg/hour)) 1700(1215)/1700(1215); Conversion degree (%) 3/3; Oxygen concentration in reaction entry zones (%) 2/2; Pressure in reactor (MPa) 7/7; Cooling in regulation zone no cooling/direct mixing with cold gas; Methanol yield (kg/hour) 800/800; Formaldehyde yield (kg/hour) 115/230; Total organic products yield (kg/hour) 920/1040; initial temperature (degreesC) 450/450; Reaction temperature (degreesC) 530/530; temperature in regulation zone (degreesC) 530/500. Thus, with introduction of the cold gas when the formation of methanol and formaldehyde was completed, the temperature of a final period of the reaction was reduced, so that formaldehyde could not decompose and reduce its concentration. Since methanol remained stable, its concentration remained constant, while content of formaldehyde increased.