Systems and methods for gas hydrate slurry formation

Patent metadata

Field	Value
Publication number	US-10047311-B2
Application number	US-201415103172-A
Country	US
Kind code	B2
Filing date	Dec 11, 2014
Priority date	Dec 12, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

Gas hydrate slurry formation systems are provided. The gas hydrate slurry formation system includes a cavitation chamber configured to receive a fluid and a cavitation device placed within the cavitation chamber. The cavitation device is configured to form a plurality of bubbles within the fluid in the cavitation chamber. The gas hydrate slurry formation system also includes a gas inlet configured to introduce a gas within the cavitation chamber such that the gas is entrained in the plurality of bubbles to form a plurality of gas-entrained bubbles. The plurality of gas-entrained bubbles implode within the cavitation chamber to form a gas hydrate slurry.

First claim

I claim:

1. A method of forming a gas hydrate slurry, the method comprising:
introducing a fluid within a cavitation chamber;
introducing one or more thermodynamic and kinetic promoters within the cavitation chamber to facilitate formation of the gas hydrate slurry, wherein the one or more thermodynamic and kinetic promoters include at least one member selected from the group consisting of tetra-n-butylammonium bromide (TBAB), tetra-n-butylammonium chloride (TBAC), tetra-n-butylammonium fluoride (TBAF), tetrahydrofuran (THF), sodium dodecyl sulphate (SDS), and combinations thereof;
forming a plurality of bubbles within the fluid in the cavitation chamber by a cavitation device, wherein forming the plurality of bubbles comprises forming the plurality of bubbles in-situ, by a hydrodynamic cavitation, an acoustic cavitation, or a combination thereof, wherein the hydrodynamic cavitation involves a turbine to reduce pressure of the fluid below a vapor pressure of the fluid to facilitate formation of the plurality of bubbles, wherein a rotation speed of the turbine ranges between 50 rpm to 10 10 rpm;
entraining a gas in the plurality of bubbles to form a plurality of gas-entrained bubbles; and
converting the plurality of gas-entrained bubbles to the gas hydrate slurry.

2. The method of claim 1 , wherein the fluid comprises water, alcohol, heptanes, octane (C 8 H 18 ), decane (C 10 H 22 ), do-decane (C 12 H 26 ), benzene (C 6 H 6 ), toluene (C 7 H 8 ), diesel, petrol, a gas condensate, a hydrate forming fluid, or combinations thereof.

3. The method of claim 1 , wherein the gas comprises methane (CH 4 ), ethane (C 2 H 6 ), propane (C 3 H 8 ), butane (C 4 H 10 ), pentane (C 5 H 12 ), heptane (C 7 H 16 ), carbon dioxide (CO 2 ), nitrogen (N 2 ), hydrogen (H 2 ), or combinations thereof.

4. The method of claim 1 , wherein entraining the gas in the plurality of bubbles further comprises introducing the gas at a location downstream of the cavitation device.

5. The method of claim 1 , wherein forming the plurality of bubbles comprises subjecting the fluid to the pressure that is sufficient to pressurize the fluid to form the plurality of bubbles.

6. The method of claim 5 , wherein the pressure of the fluid within the plurality of gas-entrained bubbles is about 2 bars to about 200 bars as the gas-entrained bubbles implode within the cavitation chamber.

7. The method of claim 1 , wherein converting the plurality of gas-entrained bubbles to the gas hydrate slurry comprises maintaining the cavitation chamber at a temperature of about −50° C. to about 50° C.

8. The method of claim 7 , wherein the plurality of gas-entrained bubbles implode within the cavitation chamber to form the gas hydrate slurry.

9. The method of claim 1 , further comprising transporting the gas hydrate slurry from the cavitation chamber to another location using a pipeline, a transport vehicle, or a combination thereof.

10. A method of forming a gas hydrate slurry, the method comprising:
introducing a fluid within a cavitation chamber;
introducing one or more thermodynamic and kinetic promoters within the cavitation chamber to facilitate formation of the gas hydrate slurry, wherein the one or more thermodynamic and kinetic promoters include at least one member selected from the group consisting of tetra-n-butylammonium bromide (TBAB), tetra-n-butylammonium chloride (TBAC), tetra-n-butylammonium fluoride (TBAF), tetrahydrofuran (THF), sodium dodecyl sulphate (SDS), and combinations thereof;
forming a plurality of bubbles within the fluid in the cavitation chamber by a cavitation device, wherein forming the plurality of bubbles comprises forming the plurality of bubbles in-situ, by a hydrodynamic cavitation, an acoustic cavitation, or a combination thereof, wherein the hydrodynamic cavitation involves a turbine to reduce pressure of the fluid below a vapor pressure of the fluid to facilitate formation of the plurality of bubbles, wherein a rotation speed of the turbine ranges between 50 rpm to 10 10 rpm;
entraining a gas in the plurality of bubbles to form a plurality of gas-entrained bubbles; and
regulating a temperature of the cavitation chamber to form the gas hydrate slurry, wherein the plurality of gas-entrained bubbles implode within the cavitation chamber to form the gas hydrate slurry.

11. The method of claim 10 , wherein the fluid comprises water, alcohol, heptanes, octane (C 8 H 18 ), decane (C 10 H 22 ), do-decane (C 12 H 26 ), benzene (C 6 H 6 ), toluene (C 7 H 8 ), diesel, petrol, a gas condensate, a hydrate forming fluid, or combinations thereof.

12. The method of claim 10 , wherein the gas comprises methane (CH 4 ), ethane (C 2 H 6 ), propane (C 3 H 8 ), butane (C 4 H 10 ), pentane (C 5 H 12 ), heptane (C 7 H 16 ), carbon dioxide (CO 2 ), nitrogen (N 2 ), hydrogen (H 2 ), or combinations thereof.

Assignees

• Indian Institute Of Tech Madras

Inventors

• Sangwai Jitendra

Classifications

• C07C7/20

  Use of additives, e.g. for stabilisation · CPC title

• B01F2215/045

  Numerical flow-rate values · CPC title

• B01J19/008

  Processes for carrying out reactions under cavitation conditions · CPC title

• B01F2215/0454

  Numerical frequency values · CPC title

• B01F2215/0427

  Numerical distance values, e.g. separation, position · CPC title