In-feed and Amine Sweetening 11/4/09 TEAGUE TREATING PLANT In-feed and Amine Sweetening 11/4/09

Intended Gas Pressure- 800 to 875 psig Intended Flows- 330 MMSCFD Expected Gas Composition ~400 ppm H2S, ~3% CO2

Primary Separation Increased diameter velocity reduction Gravity Intended Level- 10% to 70% of span Intended Gas Pressure- 800 to 875 psig Intended Gas Flow - 330MMSCFD

1 Micron filter Critical to performance of amine contactor Removes residual contaminants prior to gas treatment Intended Level- 10% to 70% of span Intended Gas Pressure- 800 to 875 psig Intended Gas Flow - 330MMSCFD

This slide shows the Inlet Gas flow through the shell side of the Feed Heater and into the Amine Contactor. It will also explain how the Amine Contactor is used to put the Inlet Gas in contact with the Lean Amine and absorb the Acid Gas from the Inlet Gas. Untreated Gas Flow Amine Contactor Amine Contactor Feed Heater (exchanger)

Amine Contactor Feed Heater (exchanger) 4 Purpose: To recover the heat from the Treated Gas and exchange with the Inlet Gas so that the Inlet Gas can approach the Lean Amine temperature. By exchanging the warmer Treated Gas (the gas coming out of the Amine Contactor) with the cooler Inlet Gas, the Inlet Gas is warmed up to a temperature that approaches the Lean Amine temperature. It is desirable that the Inlet Gas and the Lean Amine temperatures be within 10 DEGF of each other. Inlet Gas flows through Shell Side of exchanger through the baffles and around the tubes. Warmer Treated Gas is flowing through the tubes. Inlet Gas from Inlet Filter to Shell Side of the Amine Contactor Feed Heater (exchanger)

Shell and Tube Heat Exchanger Maintain Gas Inlet Temp Maximize utilization of BTU’s = <$ To Amine Contactor A Sour Gas Outlet From Inlet Filter C Sour Gas Inlet From Inlet Filter To Amine Contactor

This drawing shows the Treated Gas Flow from the Amine Contactor through the final equipment to Sales. Treated Gas Flow Amine Contactor Overhead Scrubber Amine Contactor Gas Cooler Amine Contactor Feed Heater Gas to Gas After Scrubber

Inlet Gas moves up through the 20 trays and the Acid Gas is removed from the Inlet Gas to the Sales Gas specification levels by coming in contact with the liquid Lean Amine on each tray. The Lean Amine absorbs the Acid Gas into solution. Amine Contactor Inlet Gas from Amine Contactor Feed Heater (exchanger) entering Amine Contactor Treated Gas Leaving top of Amine Contactor and going to the Overhead Scrubber

Intended Level- 10% to 70% of span Intended Gas Pressure- 800 to 875 psig Intended Gas Flow - 330MMSCFD 12 Trays total 4 solvent inlets for CO2 slip at Trays #1, #3, #5, and #7

Amine Contactor Lean Amine Feed Points This Amine Contactor has four (4) different feed point for the Lean Amine to enter. This is to allow for CO2 slippage. The top feed point will produce the least amount of CO2 slippage and the lowest feed point will produce the greatest amount of CO2 slippage. If more CO2 is being absorbed out of the Inlet Gas into the Lean Amine than is required (exp. Pipeline specification is 2% and the actual Sales Gas is at 1.6%) then by lowering the Lean Amine feed point, some of the CO2 could be “slipped” through the Contactor and thereby moving the Sales Gas CO2 concentration (from the 1.6%) closer to the actual Pipeline specification (2%) saving operational costs. Amine Contactor Lean Amine Feed Points Top Lean Amine Feed Point going in on Tray # 1 Second Lean Amine Feed Point going in on Tray # 5 Third Lean Amine Feed Point going in on Tray # 9 Bottom Lean Amine Feed Point going in on Tray # 13 Lean Amine flow to Amine Contactor feed points.

Amine Contactor Lean Amine Feed Points and Time Top Lean Amine Feed Point Top Feed Second Lean Amine Feed Point Third Lean Amine Feed Point Bottom Lean Amine Feed Point Bottom Feed Length of time the gas is in contact with the Amine The Lower the Lean Amine Feed point that is used to deliver the Lean Amine into the Contactor, the more CO2 that can be slipped. It is a function of TIME. It takes TIME for the CO2 to be absorbed from the Inlet Gas into the Amine. The lower the Feed Point the less time the Inlet Gas is in actual contact with the Amine. Therefore if it is necessary to “slip” CO2 from the Inlet Gas (leave more CO2 in the Inlet Gas), lowering the Lean Amine feed point is one effective way to do so. Inlet Gas

Amine Contactor Lean Amine Feed Points and Trays Example shows Lean Amine going into the Top Feed Valve. Other Feed Valves Closed. Four (4) different Lean Amine feed points into Amine Contactor. Typical diagram of Bubble Cap Trays Lean Amine enters on Tray #1. The liquid amine level is set by the height of the weir plate on each tray (this is typically in the 2” range). As the liquid amine level rises it will spill over the tray weir and travel down the downcomer onto the next tray. These trays can be either “sieve” or “bubble cap” type trays. The Inlet Gas enters in the bottom of the Contactor and moves up through the trays, coming in contact with the Amine on the trays. As this contact between the Lean Amine and the Inlet Gas occurs, the Acid Gas (CO2 & H2S) is absorbed from the Inlet Gas. As the Inlet Gas travels up the trays and the Lean Amine moves down the trays; the Inlet Gas becomes the Treated Gas and the Lean Amine becomes the Rich Amine.

Amine Contactor “Bulge Temperature” Example shows Lean Amine going into the Top Feed Valve. Other Feed Valves Closed. 130 135 140 145 150 155 160 165 170 125 120 115 Typical Temperatures in DEGF of the Gas as it moves through the Tower. This example assumes an Inlet Gas Temperature of 110 DEGF and a Lean Amine Temperature of 120 DEGF Four (4) different Lean Amine feed points into Amine Contactor. BULGE TEMPERATURE The Acid Gas being absorbed from the Inlet Gas into the Amine is a chemical reaction and the energy expended from this chemical reaction is in the form of heat. Under normal operations the greatest chemical reaction and thereby the highest temperature should occur at about the half way point of the Inlet Gas’s travel up through the trays ( in the middle of the Tower). The point at which this high temperature occurs in the Tower is known as the “Bulge Temperature”. The bulge temperature location in the Tower can be a good indication of the overall operation of the Contactor.

Amine Contactor Integral Overhead Scrubber Treated Gas to Overhead Scrubber Amine Contactor Integral Overhead Scrubber Internal Head Treated Gas to Amine Contactor Gas Cooler Internal Overhead Scrubber

Amine Contactor Overhead Scrubber The Treated Inlet Gas leaves the top of the Amine Contactor and enters the Overhead Scrubber. This is an internal vessel to the Amine Contactor. There is an internal head separating the Amine Contactor from this Scrubber. The purpose of this scrubber is to remove liquid amine that is carried over the top of the Amine Contactor. Treated Gas leaving the top of the Amine Contactor and entering the integral scrubber in the bottom of the Tower. Internal head separating Amine Contactor from the Overhead Scrubber.

Amine Contactor Overhead Scrubber The Treated Gas leaves the Amine Contactor (internal) Overhead Scrubber and goes to the Amine Contactor Gas Cooler Treated Gas to Amine Contactor Gas Cooler

This drawing shows the Treated Gas Flow from the Amine Contactor through the final equipment to Sales Treated Gas Flow Amine Contactor Overhead Scrubber Amine Contactor Gas Cooler Amine Contactor Feed Heater Gas to Gas After Scrubber

Intended Level- 10% to 70% of span Intended Gas Pressure- 800 to 875 psig Intended Gas Flow - 330MMSCFD 12 Trays total 4 solvent inlets for CO2 slip at Trays #1, #3, #5, and #7 To Sweet Gas Inlet

Amine Contactor Gas Cooler Treated Gas to Amine Contactor Feed Heater (exchanger) Amine Contactor Feed Heater (exchanger) Amine Contactor Gas Cooler Amine Contactor Gas Cooler Treated Gas existing the Amine Contactor Gas Cooler and traveling to the shell side of the Amine Contactor Feed Heater. This Amine Contactor Gas Cooler provides some additional cooling of the Treated Gas prior to entering the Amine Contactor Feed Heater. This provides additional flexibility in controlling the Inlet Gas temperature existing the tube side of the Amine Contactor Feed Heater. If additional heat is needed in the Inlet Gas entering the Amine Contactor, Operations can simply turn off some fans and this will provided the extra heat.

This drawing shows the Treated Gas Flow from the Amine Contactor through the final equipment to Sales. Treated Gas Flow Amine Contactor Overhead Scrubber Amine Contactor Gas Cooler Amine Contactor Feed Heater Gas to Gas After Scrubber

Shell and Tube Heat Exchanger Maintain Gas Inlet Temp Maximize utilization of BTU’s = <$ From Gas Cooler B From Gas Cooler To Gas Afterscrubber Sweet Gas Inlet D Sweet Gas Outlet

Treated Gas to Gas to Gas After Scrubber Amine Contactor Feed Heater (exchanger) Treated Gas flow to Gas to Gas After Scrubber Treated Gas flow from tube side of Amine Contactor Feed Heater (exchanger) to the Gas to Gas After Scrubber. The flow is from the tube side of the exchanger.

This drawing shows the Treated Gas Flow from the Amine Contactor through the final equipment to Sales. Treated Gas Flow Amine Contactor Overhead Scrubber Amine Contactor Gas Cooler Amine Contactor Feed Heater Gas to Gas After Scrubber

Recover condensed liquids Final process step before gas enters refrigeration Water removed using cold temperatures To Refrigeration Plant Gas/Gas Heat Exchangers From Amine Feed Heater

THIS IS A SUMMARY PAGE OF THE GAS FLOW IN AN AMINE PLANT. Treated Gas Un-Treated Inlet Gas

Walkthrough Video