Methods for the production of ammonium salts from sour water stripper gas

A method for the production of an ammonium salt, comprising the steps of:

• (i) providing a gaseous process stream A comprising more than 20 mol % (by total of the process stream A) of hydrogen sulfide (H2S), more than 20 mol % (by total of the process stream A) of ammonia (NH3) and more than 20 mol % (by total of the process stream A) of water vapor (H2O);
• (ii) optionally providing a gaseous process stream B comprising more than 60 mol % (by total of the process stream B) hydrogen sulfide (H2S);
• (iii) optionally providing a process stream C comprising ammonia (NH3);
• (iv) optionally providing a gaseous process stream D comprising sulfur dioxide (SO2);
• (v) reacting process stream A provided in step (i) and optionally one or more of the process streams provided in steps (ii)-(iv) with an aqueous medium to form an aqueous solution of a first ammonium salt;
• (vi) optionally submitting the aqueous solution of the first ammonium salt to one or more further reaction steps to form an aqueous solution of a second ammonium salt;
• (vii) recovering the aqueous solution of the first ammonium salt of step (v) and/or the aqueous solution of the second ammonium salt of step (vi);
• and
• (viii) optionally submitting one or both of the aqueous solutions recovered in step (vii) to a treatment T2 to reduce the concentration of organic compounds in the aqueous solution;
• wherein
• step (iii) is performed and step (v) comprises reacting streams A and C such that the ratio (mol:mol) of the total amount of ammonia (NH3) provided by stream A to the total amount of ammonia (NH3) provided by stream C is at least 1:20.

A method for the production of an ammonium salt, comprising the steps of:

• (i) providing a gaseous process stream A comprising more than 20 mol % (by total of the process stream A) of hydrogen sulfide (H2S), more than 20 mol % (by total of the process stream A) of ammonia (NH3) and more than 20 mol % (by total of the process stream A) of water vapor (H2O);
• (ii) optionally providing a gaseous process stream B comprising more than 60 mol % (by total of the process stream B) hydrogen sulfide (H2S);
• (iii) optionally providing a process stream C comprising ammonia (NH3);
• (iv) optionally providing a gaseous process stream D comprising sulfur dioxide (SO2);
• (v) reacting process stream A provided in step (i) and optionally one or more of the process streams provided in steps (ii)-(iv) with an aqueous medium to form an aqueous solution of a first ammonium salt;
• (vi) optionally submitting the aqueous solution of the first ammonium salt to one or more further reaction steps to form an aqueous solution of a second ammonium salt;
• (vii) recovering the aqueous solution of the first ammonium salt of step (v) and/or the aqueous solution of the second ammonium salt of step (vi);
• and
• (viii) optionally submitting one or both of the aqueous solutions recovered in step (vii) to a treatment T2 to reduce the concentration of organic compounds in the aqueous solution;
• wherein the total amount of acyclic C1-C9 saturated hydrocarbons comprised in process stream A is less than 0.2 mol % (by total of the process stream A).