Mubarek Gas Processing Plant

Mubarek Gas Processing Plant is an unitary subsidiary of Uzneftegazdobycha Joint Stock Company operating under the Uzbekneftegaя National Holding Company. The Mubarek GPP removes acidic content (hydrogen sulfide and carbon dioxide) and dehydrates natural gas producing technical sulfur and stabilized gas condensate, with parallel production of liquefied propane-butane mixture.

Mubarek Gas Processing Plant Mubarek GPP is a Category 1 enterprise contaminating the atmosphere with harmful emissions. The design of technological blocks envisages flaring of acidic gases. Products of combustion as a result of flaring gas vented from technological units (expander gases, flash gases and de-ethanization gases) and of burning resurgent gas from the Clauss process in sulfur production plants’ afterburners are emitted into the atmosphere.

Mubarek Gas Processing Plant Maximum admissible emission of contaminants (in accordance with the draft regulation on MAEs from MGPP sources) : SubstancesEmission, t/yr Sulphur dioxide Hydrogen sulphide0.118 Nitric oxide277.2 Nitrogen dioxide Carbon monoxide Hydrocarbons Ammonia71.6 Methane123.1

OLD FLARE SYSTEM NEW FLARE SYSTEM PROCESS DIAGRAM FOR LOW PRESSURE FLARE SYSTEM

Mubarek Gas Processing Plant Flaring of products at MGPP’s process units Source – low temperature separation units Flow rate – thousand m 3 per hour. Composition, % vol. С1С1 С2С2 С3С3 iC 4 nС4nС4 iС5iС5 nС5nС5 С6С6 N2N2 СО 2 Н2SН2S Source – desorption units of sweet gas desulfurization units Flow rate – 75.5 thousand m 3 per hour Composition, % vol. Н2SН2S2-4 СО СН Source – desulfurization expansers. Flow rate – 3.1 thousand m 3 per hour (flare makeup) Composition, % vol Sour gas unitSweet gas unit Н2SН2Sup to 4.0up to 0.03 СО 2 up to 14.1up to 0.14 Н 2 Оup to 1.0up to 0.83 СН

С1С1 С2С2 С3С3 iC 4 nС4nС4 iС5iС5 nС5nС5 С 6+выше С 5+выше N2N2 СО 2 Н2SН2S С1С1 С2С2 С3С3 iC 4 nС4nС Source - Condensate Stabilisation Unit (degassing). Flow – 0.3 thousand m 3 per hour Composition, % vol. Source – Plant Nr 14 (fuel gas) flare makeup. Flow rate – 16.5 thousand m 3 per hour. Composition, % vol. Mubarek Gas Processing Plant Flaring of products at MGPP’s process units

Gross Emissions, thousand tons

Specific Emissions, thousand tons/bln m3

MGPP’s environmental facilities Sweet acidic gas concentration unit Capacity of the sweet acidic gas concentration unit: 20.0 thousand m 3 per hour. Clauss process is used to produce 10.0 thousand tons of sulphur from concentrated acidic gases per year. Plant for cleanup of tail gases from Clauss Process using Sulphren method A process for cleanup of residual tail gases from the U-351 Clauss plant producing sulphur has been introduced in order to reduce emissions. Utilization of tail gases from the Clauss process that used to be burned in afterburners is organised using Sulphren Plant with a capacity of 17.0 thousand tons of sulphur per year Propane Refrigeration Cycle The plant includes a propane refrigeration plant generating cold for the low-temperature separation units of the PRC. As a result of PRC commissioning, ammonia emissions intrinsic to ammonia based refrigeration units have been substantially reduced Mubarek Gas Processing Plant

MGPP’s environmental measures The flaring system has been rehabilitated, introducing two high pressure and two low pressure flares in order to optimize utilization of emissions Clauss and Sulphren process catalysts are used at sulphur production plants that constitute the source of the most harmful emissions; these processes ensure maximum sulphur extraction and minimum sulphur dioxide content in combustion products A system forwarding expanse gases as a fuel to afterbuners at sulphur production plants was introduced in order to maximize utilization of process emissions Mubarek Gas Processing Plant

Planned flaring reduction activities 1. Reduction of greenhouse gas content in process emissions from MGPP’s units can only be ensured by latest technologies. For example, it should be feasibly to look for and to introduce a technology allowing to extract CO 2 from the gas flared, provided such technology proves economically viable 2. Installation of a unit for automatic monitoring of composition of gases coming from Clauss Process, with automatic adjustment of acidic gas to air ratio at the inlet Mubarek Gas Processing Plant

3. Construction of a unit for cleanup of tail gases from the Clauss process featuring adsorption at the catalyst’s cold layer. The process is similar to the Sulphren process. The only difference is that in Sulphren process, catalyst regeneration is done using heated tails gases from the Clauss process while the cold adsorption process takes heat required for sulphur desorbtion from the catalyst, using part of process gas coming from the Clauss process’s generator-reactor Planned flaring reduction activities Mubarek Gas Processing Plant

Issues preventing complete elimination of flaring at Mubarek GPP The technical facilities available at Mubarek GPP do not allow to stop the practice of flaring due to H 2 S content being up to 4.0% and CO 2 content being up to 94%. Mubarek GPP looks forward to receive active support from the GGFR to solve this issue

Mubarek Gas Processing Plant