An integrated process for production of urea and urea-ammonium sulphate (UAS) comprises: a urea synthesis step carried out in a urea synthesis reactor; a recovery and concentration step, wherein a urea solution produced in the urea synthesis step is progressively concentrated in at least one recovery section and in a concentration section, recovering unreacted ammonia and carbon dioxide and water from said urea solution; a step of producing ammonium sulphate by reaction of sulphuric acid and ammonia in an ammonium sulphate production apparatus; a step of mixing said ammonium sulphate with concentrated urea coming from the concentration section to produce a UAS mixture; in the ammonium sulphate production step, at least a part of the ammonia is provided by at least one off-gas containing ammonia and recovered from the recovery and concentration step.

An integrated process for production of urea and urea-ammonium sulphate (UAS) comprises: a urea synthesis step carried out in a urea synthesis reactor; a recovery and concentration step, wherein a urea solution produced in the urea synthesis step is progressively concentrated in at least one recovery section and in a concentration section, recovering unreacted ammonia and carbon dioxide and water from said urea solution; a step of producing ammonium sulphate by reaction of sulphuric acid and ammonia in an ammonium sulphate production apparatus; a step of mixing said ammonium sulphate with concentrated urea coming from the concentration section to produce a UAS mixture; in the ammonium sulphate production step, at least a part of the ammonia is provided by at least one off-gas containing ammonia and recovered from the recovery and concentration step.

A system for the production of ammonium sulfate granules including a pipe cross reactor (PCR) configured to contact concentrated sulfuric acid with anhydrous ammonia to produce a PCR product comprising ammonium sulfate; and a granulator fluidly connected to the PCR, whereby PCR product extracted from the PCR can be introduced into the granulator, an inlet for ammonium sulfate seed material, an ammonia sparger configured to spray liquid anhydrous ammonia onto a bed of ammonium sulfate granules within the granulator, and a granulator product outlet configured for extraction of granulator product comprising ammonium sulfate granules from the granulator. A method of producing ammonium sulfate granules is also provided.

A system for the production of ammonium sulfate granules including a pipe cross reactor (PCR) configured to contact concentrated sulfuric acid with anhydrous ammonia to produce a PCR product comprising ammonium sulfate; and a granulator fluidly connected to the PCR, whereby PCR product extracted from the PCR can be introduced into the granulator, an inlet for ammonium sulfate seed material, an ammonia sparger configured to spray liquid anhydrous ammonia onto a bed of ammonium sulfate granules within the granulator, and a granulator product outlet configured for extraction of granulator product comprising ammonium sulfate granules from the granulator. A method of producing ammonium sulfate granules is also provided.

Provided is a method for recycling supercritical waste liquid and a method for producing a silica aerogel blanket capable of reducing the production costs and preventing the deterioration in thermal insulation performance of a silica aerogel blanket, the method including adding sulfuric acid to supercritical waste liquid to remove ammonium ions in the form of ammonium sulfate salt, the ammonium ions which are present in the supercritical waste liquid, and reusing supercritical waste liquid from which the ammonium ions are removed.

Provided is a method for recycling supercritical waste liquid and a method for producing a silica aerogel blanket capable of reducing the production costs and preventing the deterioration in thermal insulation performance of a silica aerogel blanket, the method including adding sulfuric acid to supercritical waste liquid to remove ammonium ions in the form of ammonium sulfate salt, the ammonium ions which are present in the supercritical waste liquid, and reusing supercritical waste liquid from which the ammonium ions are removed.

An agriculture treatment solution may include one or more metal salts and a base product fluid. The base product fluid may include a molecular compound that is a chelating compound. The molecular compound may have the formula: ((NH.sub.4).sub.2SO.sub.4).sub.a.(H.sub.2SO.sub.4).sub.b.(H.sub.2O).sub.c.(NH.sub.4HSO.sub.4).sub.x. In the formula, a may be between 1 and 5, b may be between 1 and 5, c may be between 1 and 5, and x may be between 1 and 10. The agriculture treatment solution may be formed by adding the one or more metal salts to the base product fluid and water. The agriculture treatment solution may be added to an agricultural crop to deliver at least one of the metal salts to the agricultural crop. The at least one metal salt may be a micronutrient for the agricultural crop.

An agriculture treatment solution may include one or more metal salts and a base product fluid. The base product fluid may include a molecular compound that is a chelating compound. The molecular compound may have the formula: ((NH.sub.4).sub.2SO.sub.4).sub.a.(H.sub.2SO.sub.4).sub.b.(H.sub.2O).sub.c.(NH.sub.4HSO.sub.4).sub.x. In the formula, a may be between 1 and 5, b may be between 1 and 5, c may be between 1 and 5, and x may be between 1 and 10. The agriculture treatment solution may be formed by adding the one or more metal salts to the base product fluid and water. The agriculture treatment solution may be added to an agricultural crop to deliver at least one of the metal salts to the agricultural crop. The at least one metal salt may be a micronutrient for the agricultural crop.

A method can include: processing precursors, electrochemically oxidizing sulfur dioxide, processing sulfuric acid and hydrogen, and/or any suitable steps.

A method can include: processing precursors, electrochemically oxidizing sulfur dioxide, processing sulfuric acid and hydrogen, and/or any suitable steps.