METHOD OF PRODUCING METHANOL FROM CARBON DIOXIDE AND HYDROGEN WITH QUANTITATIVE UTILIZATION OF CARBON DIOXIDE Russian patent published in 2024 - IPC C07C29/151 C07C31/04 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing methanol. This method includes the following stages: (a) stream (I) containing carbon dioxide and hydrogen in methanol synthesis plant (A) at temperature from 150 to 300°C and pressure from 3 to 10 MPa abs. in the presence of a methanol synthesis catalyst, it is converted into a reaction mixture containing methanol, water, carbon dioxide, carbon monoxide, hydrogen, dimethyl ether and methane, from said reaction mixture condensing a stream of crude methanol (II) enriched with methanol and water, and outputting from methanol synthesis unit (A) a stream of crude methanol (II) and a gaseous stream (III) containing carbon dioxide, carbon monoxide, hydrogen and methane, (b) a stream of crude methanol (II) from step (a) is subjected to reduced pressure in range of 0.1 to 2 MPa abs. in reduced pressure plant (B) and produced during pressure reduction gas (IV) containing carbon dioxide and methane, as well as a degassed stream of crude methanol (V) enriched with methanol and water, (c) from the degassed stream of crude methanol (V) from step (b) in a distillation device (C), a stream of low-boiling components (VI) containing carbon dioxide and dimethyl ether is separated by distillation, and a still stream (VII) enriched with methanol and water, and (d) from bottom stream (VII) from step (c) in additional distillation device (D) water-containing stream of high-boiling components (VIII) is separated and methanol is separated by distillation in the form of stream (IX). At that: (e) valuable components - carbon dioxide, carbon monoxide, simple dimethyl ether and methane - stream (III), as well as at least one of two streams (IV) and (VI), are fed into combustion plant (E), and combusting therein while feeding oxygen-containing gas (X), which has an oxygen content of 30 to 100 vol.%, and obtaining carbon dioxide-containing flue gas (XI), (f) from carbon dioxide-containing flue gas (XI) from step (e) in a carbon dioxide recovery unit (F), a stream (XIII) enriched with carbon dioxide is separated to form an exhaust gas stream (XII), (g) stream (XIII) separated in carbon dioxide recovery unit (F) and enriched with carbon dioxide from step (f) is returned to methanol synthesis unit (A) of step (a) as a source containing carbon dioxide, stream (I), (h) hydrogen starting material (XIV) is fed into methanol synthesis unit (A) of step (a) as a hydrogen-containing source of stream (I), (i) initial carbon dioxide material (XV) is fed into carbon dioxide-containing flue gas (XI) and/or into a methanol synthesis unit (A) of step (a) as a source of carbon dioxide-containing stream (I).

EFFECT: development of a method of producing methanol from carbon dioxide and hydrogen, which almost completely converts carbon dioxide with hydrogen into methanol using a technology with zero carbon dioxide emissions.

15 cl, 6 dwg, 2 tbl, 2 ex