PROCESS FOR PREPARING METHYL PROPIONATE AND METHYL METHACRYLATE Russian patent published in 2016 - IPC C07C69/24 C07C67/38 C07C69/54 C07C67/30 C07C4/04 C07C11/04 

FIELD: oil industry.

SUBSTANCE: invention relates to processes for conversion of hydrocarbon gas to produce liquid chemical products with high added value. Method for processing natural or associated gas and hydrocarbon petroleum gas with a high content of heavy homologues of methane and low methane number, to obtain methyl propionate and methyl methacrylate, is two-stage selective direct homogeneous oxidation of hydrocarbon gas and subsequent catalytic carbonylation mixture to form methyl propionate, condensation portion obtained methyl propionate with formaldehyde to produce methyl methacrylate, and at one stage of oxidation of hydrocarbon gas, conducted at temperature of 700-800 °C and pressure of 1-30 bar, gas mixture containing ethylene and CO, and other steps performed at pressure of 30-80 bar and initial temperature of 350-420 °C, produced methanol and CO, wherein the first or hydrocarbon gas is oxidized at step carried out at temperature of 700-800 °C, to obtain ethylene and then oxidized in step conducted at initial temperature of 350-420 °C, first hydrocarbon gas is oxidized on stage carried out at initial temperature of 350-420 °C, followed by condensation of resulting methanol, formaldehyde and water, and then resultant oxidized gas mixture at step carried out at temperature of 700-800 °C, followed by addition of methanol first stage; and then resultant mixture was treated with two-step oxidation at elevated temperatures and pressures in presence of catalyst for carbonylation reaction of ethylene, methanol and CO, and hydrocarbon gas is obtained with high methane number and liquid products from which methyl propionate was isolated, portion of which is further treated with formaldehyde. Method for processing natural or associated gas and hydrocarbon petroleum gas with a high content of heavy homologues of methane and a low methane number, to obtain methyl propionate and methyl methacrylate, is selectively direct the homogeneous oxidation of hydrocarbon gas and subsequent catalytic carbonylation mixture to produce methyl propionate, condensation of the resulting methyl propionate with formaldehyde to produce methyl methacrylate, with a portion of the hydrocarbon gas is subjected to an oxidative conversion step carried out at a pressure of 30-80 bar and the initial temperature of 350-420 °C, followed by condensation of the liquid products and recovering the methanol and another portion of the hydrocarbon gas is subjected to an oxidative conversion step carried out at a temperature of 700-800 °C and a pressure of 1-30 bar to give a gas mixture containing ethylene and CO, which, after cooling, was bubbled through the resulting methanol in the presence of a catalyst for the carbonylation reaction of ethylene, methanol and CO at elevated temperatures and pressures to give a hydrocarbon gas with a high methane number and liquid products from which the methyl propionate was isolated, a portion of which is further treated with formaldehyde.

EFFECT: technical result is more simple and economical process for preparing desired products while obtaining purified "dry" gas with increased compared to starting hydrocarbon gas methane number.

2 cl, 3 ex