Pretreatment equipment for hydrocarbon gas to be liquefied and shipping base equipment

1. A method of using a liquefaction pretreatment facility for a hydrocarbon gas, wherein the liquefaction pretreatment facility comprises:

an adsorption vessel which is connected to a treatment gas line, the adsorption vessel is packed with synthetic zeolite;

a regeneration gas line connected to the adsorption vessel; and

a temperature control system configured to control a heating temperature of a regeneration gas in the regeneration gas line;

and wherein the method comprises:

supplying a hydrocarbon gas containing water, hydrogen sulfide, and oxygen from the treatment gas line to the adsorption vessel, and adsorbing and removing water in the hydrocarbon gas supplied from the treatment gas line using the synthetic zeolite in the adsorption vessel;

supplying a preheated regeneration gas from the regeneration gas line to the adsorption vessel so as to regenerate the synthetic zeolite having adsorbed water through heating; and

controlling a heating temperature of the regeneration gas using the temperature control system so that a temperature in the adsorption vessel during regeneration of the synthetic zeolite is a set temperature that is preliminarily set,

wherein the set temperature is in a range from 200° C. to 230° C.

2. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 , wherein the synthetic zeolite has an average pore diameter of 3 angstroms or less.

3. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 , wherein the regeneration gas comprises the hydrocarbon gas after removal of water in the adsorption vessel.

4. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 ,

wherein the adsorption vessel comprises a first adsorption vessel and a second adsorption vessel, and the method further comprises:

supplying the hydrocarbon gas from the treatment gas line to another one of the adsorption vessel to adsorb and remove water in the hydrocarbon gas when the synthetic zeolite in one of the adsorption vessels is regenerated.

5. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 ,

wherein the hydrocarbon gas further contains carbon dioxide, and

wherein the liquefaction pretreatment facility further comprises:

an absorption vessel which is arranged on an upstream side of the adsorption vessel; and

a regeneration vessel; and

wherein the method further comprises:

using the absorption vessel to absorb carbon dioxide and hydrogen sulfide contained in the hydrocarbon gas by bringing the hydrocarbon gas into contact with an absorption liquid containing an amine compound;

and using the regeneration vessel to regenerate the absorption liquid having been brought into contact with the hydrocarbon gas in the absorption vessel by heating the absorption liquid to allow the absorption liquid to emit carbon dioxide and hydrogen sulfide.

6. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 ,

wherein the hydrocarbon gas further contains mercury, and

wherein the liquefaction pretreatment facility further comprises a mercury removal unit which is arranged on an upstream side of the adsorption vessel; and

wherein the method further comprises:

using the mercury removal unit to remove mercury contained in the hydrocarbon gas by bringing the hydrocarbon gas into contact with a mercury removal agent in which sulfur is supported on activated carbon.

7. A method of using a shipping terminal facility, comprising:

pretreating a hydrocarbon gas by using the method of using the liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 ; and

using a liquefaction facility to liquefy the hydrocarbon gas treated in the liquefaction pretreatment facility.

8. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 , wherein 20 ppm by mole or more of the oxygen is supplied from the treatment gas line to the adsorption vessel.

9. The method of using a liquefaction pretreatment facility for a hydrocarbon gas according to claim 1 , wherein after the water removal step, a content of water in the hydrocarbon gas coming out from an outlet of the adsorption vessel is 1 ppm by mole or less.