FIELD OF THE INVENTION

The present invention relates to a composition for removal of a sulfur-containing compound in a liquid or gas.

BACKGROUND OF THE INVENTION

As a method for removing a sulfur-containing compound (in particular, hydrogen sulfide, a compound containing an —SH group, etc.) which is included in a liquid or gas and in which its toxicity, an offensive odor, or the like is regarded as a problem, a method in which an aldehyde, such as formaldehyde, glyoxal, glutaraldehyde, 3-methylglutaraldehyde, 1,9-nonanedial, and 2-methyl-1,8-octanedial, or a metal salt, such as zinc oxide, zinc sulfate, zinc carbonate, tetranuclear oxo zinc octoate, calcium oxide, calcium carbonate, and an amino acid metal chelate, is added to the system, thereby converting the sulfur-containing compound into a compound with a low odor or a compound with a low toxicity, and so on are known (see PTLs 1 to 14).

CITATION LIST

Patent Literature

PTL 1: U.S. Pat. No. 1,991,765 A

PTL 2: U.S. Pat. No. 4,680,127 A

PTL 3: U.S. Pat. No. 5,284,635 A

PTL 4: WO 2011/087540 A

PTL 5: JP 2012-525964 A

PTL 6: JP 2013-544305 A

PTL 7: US 2013/0090271 A

PTL 8: US 2013/0089460 A

PTL 9: WO 2015/141535 A

PTL 10: WO 2016/121747 A

PTL 11: US 2009/0145330 A

PTL 12: JP 2013-513718 A

PTL 13: JP 2009-007479 A

PTL 14: JP 2017-505866 A

SUMMARY OF THE INVENTION

Technical Problem

Although it is possible to remove a sulfur-containing compound included in a liquid or gas, particularly a sulfur-containing compound included in a hydrocarbon which is a liquid or gas by the aforementioned method, there is still room for improvement on the removal efficiency.

Solution to Problem

An object of the present invention is to provide a composition and a method, by which the sulfur-containing compound (at least one selected from the group consisting of hydrogen sulfide and a compound containing an —SH group) included in a liquid or gas can be efficiently removed.

The present inventors have found that as compared with the case of using an aldehyde alone, the sulfur-containing compound can be efficiently removed through a joint use of an aldehyde and a specified amine and further made extensive and intensive investigations on a basis of the foregoing finding, thereby leading to accomplishment of the present invention.

The present invention is concerned with the following [1] to [13].

[1] A composition for removal of a sulfur-containing compound in a liquid or gas, wherein the sulfur-containing compound is at least one selected from the group consisting of hydrogen sulfide and a compound containing an —SH group, and the composition contains an aldehyde and a polyvalent amine represented by the following general formula (1) (hereinafter sometimes referred to as “polyvalent amine (1)”).



In the formula, W represents a methylene group, a dimethylene group, or a trimethylene group; R1to R5each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms, provided that R1and R2may be connected with each other to form a ring and R3and R4may be connected with each other to form a ring; n represents an integer of 0 to 3,000; W may be substituted with at least one R6(where R6represents an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or an aryl group having 6 to 12 carbon atoms); R1to R6may be each substituted with a hydroxyl group or an alkoxy group having 1 to 6 carbon atoms; and in the case where a plurality of W are present, they are not necessarily the same group, in the case where a plurality of R5are present, they are not necessarily the same group, and in the case where a plurality of R6are present, they are not necessarily the same group.

[2] The composition as set forth in [1], wherein in the general formula (1), all of W are a dimethylene group.

[3] The composition as set forth in [1] or [2], wherein in the general formula (1), n is an integer of 0 to 5.

[4] The composition as set forth in any of [1] to [3], wherein the aldehyde is at least one selected from the group consisting of an α,β-unsaturated aldehyde and a dialdehyde.

[5] The composition as set forth in any of [1] to [3], wherein the aldehyde is at least one selected from the group consisting of acrolein, senecioaldehyde, glyoxal, glutaraldehyde, 3-methylglutaraldehyde, 1,9-nonanedial, and 2-methyl-1,8-octanedial.

[6] The composition as set forth in any of [1] to [5], wherein the liquid or gas is a hydrocarbon.

[7] The composition as set forth in any of [1] to [5], wherein the liquid or gas is at least one selected from the group consisting of natural gas, liquefied natural gas (LNG), liquefied petroleum gas (LPG), sour gas, dry gas, wet gas, oil field gas, associated gas, tail gas, dimethyl ether, crude oil, naphtha, heavy aromatic naphtha, gasoline, kerosene, diesel oil, light oil, lubricating oil, heavy oil, A-heavy oil, B-heavy oil, C-heavy oil, jet fuel oil, FCC slurry, asphalt, condensate, bitumen, extra heavy oil, tar, gas to liquid (GTL), coal to liquid (CTL), asphaltene, aromatic hydrocarbons, alkylates, base oil, kerogen, coke, black oil, synthetic crude oil, reformed gasoline, isomerate gasoline, regenerated heavy oil, residual oil, gasoline and distilled oil, raffinate, wax, biomass fuel, biomass to liquid (BTL), biogasoline, bioethanol, bio-ETBE, and biodiesel.
[8] A method for removal of a sulfur-containing compound in a liquid or gas, the method including bringing the composition as set forth in any of [1] to [7] into contact with the liquid or gas, the sulfur-containing compound being at least one selected from the group consisting of hydrogen sulfide and a compound containing an —SH group.
[9] The method as set forth in [8], wherein the composition is brought into contact with the liquid or gas such that the amount of the aldehyde included in the composition is 0.1 to 5,000 parts by mass based on 1 part by mass of the sulfur-containing compound included in the liquid or gas.
[10] The method as set forth in [8] or [9], wherein the composition is brought into contact with the liquid or gas at a temperature ranging from −30 to 500° C.
[11] Use of the composition as set forth in any of [1] to [7] for removal of a sulfur-containing compound in a liquid or gas, wherein the sulfur-containing compound is at least one selected from the group consisting of hydrogen sulfide and a compound containing an —SH group.
[12] A hydrocarbon containing the composition as set forth in any of [1] to [5].
[13] An asphalt containing the composition as set forth in any of [1] to [5].

The composition of the present invention is excellent in the removal efficiency of a sulfur-containing compound (at least one selected from the group consisting of hydrogen sulfide and a compound containing an —SH group) in a liquid or gas.

