A METHOD FOR PRODUCING A SYNTHESIS GAS WITH LOW AMOUNTS OF HYDROGEN CYANIDE

摘要

A method for producing a synthesis gas having the reduced HCN content is provided. A method for producing a synthesis gas, including: a first step of obtaining the synthesis gas containing H2 and CO from natural gas through the steam reforming process; a second step of contacting the synthesis gas obtained by the preceding step with a catalyst at a temperature of 350 to 550°C and decomposing HCN contained in the synthesis gas to thereby obtain the synthesis gas that contains NH3, wherein as the catalyst, a catalyst containing ZnO is used; optionally a third step of lowering the temperature of the synthesis gas; a fourth step of separating water and NH3 from the synthesis gas in which the temperature is lowered in the preceding step; a fifth step of separating H2 from the synthesis gas from which water and NH3 are separated in the preceding step; and a sixth step of further separating the remaining NH3 from the synthesis gas from which H2 is separated in the preceding step.