A method for revamping a self-stripping urea plant comprising the installation of a new CO2-stripping synthesis section (6), wherein at least part of the aqueous urea solution (10) leaving said new section (6) is directed to the existing low pressure recovery section (4) of the self-stripping plant, by-passing the existing self-stripping high-pressure section (2) and medium pressure treatment section (3).

A method for revamping a self-stripping urea plant comprising the installation of a new CO2-stripping synthesis section (6), wherein at least part of the aqueous urea solution (10) leaving said new section (6) is directed to the existing low pressure recovery section (4) of the self-stripping plant, by-passing the existing self-stripping high-pressure section (2) and medium pressure treatment section (3).

The invention pertains to an integrated process for capturing CO.sub.2. The process involves desorbing gaseous CO.sub.2 from a CO.sub.2 containing aqueous solution comprising carbonate, bicarbonate, sesquicarbonate, carbamate, or a mixture thereof. The desorbing of gaseous CO.sub.2 is conducted in the presence of a suitable water soluble substance. If desired, the process may also at least partially recover the soluble substance using a membrane, distillation, or another technique.

The invention pertains to an integrated process for capturing CO.sub.2. The process involves desorbing gaseous CO.sub.2 from a CO.sub.2 containing aqueous solution comprising carbonate, bicarbonate, sesquicarbonate, carbamate, or a mixture thereof. The desorbing of gaseous CO.sub.2 is conducted in the presence of a suitable water soluble substance. If desired, the process may also at least partially recover the soluble substance using a membrane, distillation, or another technique.

A method is disclosed for stripping in a stripper a urea synthesis solution received from a urea forming process wherein ammonia and CO2 are reacted under urea forming conditions. The shell space of the stripper comprises a continuous vertical zone.

Disclosed herein is a system and method for sulphur-assisted carbon capture and utilization. The system includes a sulphur depolarized electrolyser (SDE) for receiving electricity, H.sub.2O and SO.sub.2 and for electrolysing the H.sub.2O and SO.sub.2 to produce hydrogen and sulphuric acid (H.sub.2SO.sub.4), a decomposition reactor for receiving and decomposing the H.sub.2SO.sub.4 into SO.sub.3 and H.sub.2O, wherein the H.sub.2O is recycled to the SDE, a sulphur submerged combustor for converting the SO.sub.3 to SO.sub.2 and producing S.sub.n vapor, a sulphur power plant for combusting S.sub.n vapor to produce SO.sub.2, electricity and heat and for supplying the SO.sub.2 and the electricity to the SDE and for supplying the heat to the decomposition reactor. The hydrogen is delivered to a carbon capture and utilization facility. An optional Flue Gas Desulphurisation (FGD) regenerable system removes SO.sub.2 from flue gas, a CO.sub.2 converter generates COS, and a separator separates the COS from the flue gas.

A process for synthesis of urea from CO.sub.2 and NH.sub.3 wherein a steam flow (13) produced in the condenser (3) of a high-pressure synthesis loop is compressed to raise its pressure and temperature before using the steam as a heat source for a downstream step of the process.

A process for synthesis of urea from CO.sub.2 and NH.sub.3 wherein a steam flow (13) produced in the condenser (3) of a high-pressure synthesis loop is compressed to raise its pressure and temperature before using the steam as a heat source for a downstream step of the process.

The invention relates to a virtual sensing method and system for controlling at least one composition variable in a urea production process, based on a plurality of online measured process variables and a model, wherein the model is used to estimate, during the urea production process, the at least one composition variable indicative of a urea content on the basis of the plurality of online measured process variables, and modifying at least one of the plurality of online measured process variables for ensuring that a value of the at least one composition variable is within a predetermined range. The invention also relates to determining the model.

The invention relates to a virtual sensing method and system for controlling at least one composition variable in a urea production process, based on a plurality of online measured process variables and a model, wherein the model is used to estimate, during the urea production process, the at least one composition variable indicative of a urea content on the basis of the plurality of online measured process variables, and modifying at least one of the plurality of online measured process variables for ensuring that a value of the at least one composition variable is within a predetermined range. The invention also relates to determining the model.