Salt separator and a method for producing a methane-containing gas mixture from biomass using a salt separator

A combination, comprising:

• a salt separator for separating at least one of salts or solid materials from a pumpable aqueous fluid mixture under process conditions;
• and
• a catalytic converter configured for performing a methanation reaction;
• the salt separator including:
• a case with walls defining a reaction zone in a form of a cavity for transforming the pumpable aqueous fluid mixture into a raw mixture for further processing, said case having a bottom;
• a rising pipe having a feed opening for feeding the pumpable aqueous fluid mixture to said cavity, said rising pipe protruding through said bottom of said case and into said cavity such that said feed opening is displaced away from said bottom of said case;
• said cavity having an upper region with a first extraction opening formed therein for the raw mixture, wherein the raw mixture at said first extraction opening has been freed from at least one of the salts or the solid materials, said first extraction opening configured for supplying the raw mixture, which has been freed from at least one of the salts or the solid materials, to said catalytic converter;
• and
• said cavity having a lower region with a second extraction opening formed therein for a brine containing at least one of the salts or the solid materials, said second extraction opening is disposed lower down than said feed opening.