FIELD: chemistry.
SUBSTANCE: present invention relates to a methanol synthesis method involving the following steps: (i) reforming hydrocarbon starting material and separation of water from the resulting mixture with gas reforming to obtain freshly prepared gas containing hydrogen and carbon oxides, where the said mixture with freshly prepared gas has stoichiometric coefficient R defined by the formula: R=([H2]-[CO2])/([CO2]+[CO]), which is less than 2.0; (ii) formation of a mixture of synthetic gas consisting of a stream of said freshly prepared gas, unreacted synthetic gas and hydrogen; (iii) passing the mixture with synthetic gas at high temperature and pressure through a methanol synthesis catalyst bed to obtain a stream of product containing methanol and unreacted synthetic gas; (iv) cooling said stream of product with extraction of a stream of crude methanol from said unreacted synthetic gas; (v) removal of a portion of said unreacted synthetic gas as blowout gas, and (vi) feeding the remaining unreacted synthetic gas to step (ii). Hydrogen is extracted from at least a portion of said blowout gas and a portion of said freshly prepared gas and the extracted hydrogen is added to the mixture with synthetic gas.
EFFECT: disclosed method lowers volume of catalyst and amount of wastes, reduces size of reactors and simplifies purification of crude methanol, which lowers cost of the process.
12 cl, 3 ex, 3 dwg
