# US 8,771,603 B2 · Method for removal of hydrogen sulfide from geothermal steam and condensate

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- Number: US 8,771,603 B2
- Document ID: US8771603B2
- Status: Granted
- Kind: B2
- Application number: 13/712,331
- Filed: 2012-12-12
- Published: 2013-04-25
- Granted: 2014-07-08
- Earliest claimed: 2012-12-12
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Multi-Chem Group, LLC
- Inventors: Michael L. Harless; Daniel K. Durham
- Web page: https://patentgrep.com/patent/US8771603B2

## CPC

- B01D 53/52: Hydrogen sulfide
- B01D 53/002: {by condensation}
- B01D 2257/304: Hydrogen sulfide
- C02F 2101/101: {Sulfur compounds}
- C02F 2103/023: {Water in cooling circuits}
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

## Abstract

A method for scavenging hydrogen sulfide from geothermal steam in a condenser under vacuum. A fine curtain of atomized acrolein-water droplets may be sprayed into geothermal steam condensers in an amount of approximately 2:1 molar ratio of acrolein to H2S based on hydrogen sulfide in the incoming steam from the turbine. The range being approximately 0.1 ppm to 500 ppm of sulfide. The acrolein is allowed to react with the gas phase H2S to form non-volatile aldehyde byproducts which partition into the water phase, are returned to the cooling tower and ultimately removed by normal cooling-tower blow down.

## Claims

### Claim 1

A system comprising:
a cooling tower comprising cooling water;
an acrolein feed line in fluid communication with the cooling tower;
a condenser, where the condenser is in fluid communication with the cooling tower through a flow line;
a geothermal steam line in fluid communication with the condenser; and
a plurality of spray nozzles, the spray nozzles in fluid communication with the flow line and adapted to spray acrolein-water droplets inside the condenser.

### Claim 2 (depends on 1)

The system of claim 1, further comprising:
an acrolein reservoir in fluid communication with the acrolein feed line; and
a bisulfate scrubber in fluid communication with the acrolein reservoir.

### Claim 3 (depends on 1)

The system of claim 1 further comprising:
a cooling water return line in fluid communication with the cooling tower and the condenser.

### Claim 4 (depends on 1)

The system of claim 1, further comprising:
a cooling tower sump outlet line in fluid communication with the cooling tower and the flow line; and
an acrolein injector in fluid communication with the acrolein feed line and the cooling tower sump outlet line.

### Claim 5 (depends on 1)

The system of claim 1 further comprising a hydrogen sulfide sensor adapted to measure hydrogen sulfide in a non-condensible gas layer in the condenser.

### Claim 6 (depends on 1)

The system of claim 1, wherein the acrolein-water droplets comprise acrolein the aqueous phase.

### Claim 7 (depends on 1)

The system of claim 1 wherein the condenser is under vacuum.

### Claim 8 (depends on 1)

The system of claim 1, wherein the geothermal steam line comprises geothermal steam from power plant turbines and wherein the geothermal steam comprises hydrogen sulfide.

### Claim 9 (depends on 8)

The system of claim 8, wherein the condenser is adapted to react the hydrogen sulfide from in the geothermal steam in the vapor phase with the acrolein-water droplets.

### Claim 10 (depends on 9)

The system of claim 9, wherein the condenser has a temperature of approximately 250° F.

### Claim 11 (depends on 9)

The system of claim 9, wherein the amount of acrolein in the acrolein water droplets is approximately 0.1 ppm to approximately 20 ppm per hydrogen sulfide (w/w) in the geothermal steam.