SYNTHESIS GAS PRODUCTION PROCESS CONTROL METHOD FOR THE LOW-TONNAGE METHANOL PRODUCTION Russian patent published in 2019 - IPC C01B3/38 C10J3/00 C07C31/04 

FIELD: chemistry.

SUBSTANCE: invention relates to production of synthesis gas for low-tonnage production of methanol. Method is realized by partial oxidation of hydrocarbon gases (HCG) at pressure 6.0–7.0 MPa in gas generator equipped with HCG and oxidizer input units. Further, synthesis gas from the gas generator outlet is supplied to a waste heat boiler and cooled to 320–370 °C by flow of chemically purified water. Utilization of waste heat boiler is connected with input of synthesis gas composition correction unit, including: (1) a unit for correcting the ratio of volumetric concentrations of hydrogen and carbon monoxide in synthesis gas, comprising a first mixer and a first limiter connected to the output of the waste heat boiler, first pipeline of first branch pipe is connected directly to first mixer, the second pipeline of the first branch pipe is connected to the first mixer through series-connected controlled high-temperature throttle and converter with catalyst of steam conversion of carbon monoxide; (2) a carbon dioxide content correction unit, including a heat exchanger-cooler, in which synthesis gas from the first mixer outlet is cooled to 30–70 °C by a stream of chemically purified water and fed into a separator, in which from the cooled vapour-gas mixture water condensate is separated, then from the output of the separator dry synthesis gas is supplied to the input of the second branch pipe, the first pipeline of which is directly connected to the second mixer, from the outlet of which synthesis gas is supplied to the methanol synthesis unit, second pipeline of second branch pipe is connected to second mixer via in-series controlled throttle and carbon dioxide adsorber; (3) a gas analyzer connected to the synthesis gas pipeline downstream of the second mixer. Controlling ratio of volumetric concentrations of hydrogen and carbon monoxide in range H₂/CO = 2.2–2.6 and stoichiometric ratio of its components in the range M = 2.0–2.3 is carried out using an automated control and monitoring system, which is based on results of the information on the current hydrogen concentration discretely coming from the gas analyzer and carbon oxides in synthesis gas from output of second mixer automatically calculates corrected control signals, which in form of control voltages are supplied to input of controlled high-temperature throttle unit for correction of ratio H₂/CO and to inlet of controlled throttle of carbon dioxide content correction unit.

EFFECT: technical result is optimization of composition of synthesis gas for subsequent catalytic synthesis of methanol.

1 cl, 1 dwg, 4 tbl, 4 ex