Methods for recovering and analyzing amines
AssigneeKabushiki Kaisha Toshiba
InventorsHiroko Watando, Takashi Kuboki
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Abstract
The objects of embodiments in the present disclosure are to provide a method capable of recovering two or more amine compounds at the same time from a gas or solution, and also to provide a method capable of analyzing the recovered amines. The amine-recovering method comprises the steps (A) and (B). In the step (A), the gas or solution is brought into contact with a solid adsorbent so that the adsorbent may retain the amines. In the step (B), the amines retained by the adsorbent in the step (A) are eluted out by use of a basic compound-containing organic solvent. The solid adsorbent has a substituent group represented by —SO3M (M is H or an alkali metal).
Claims17
A method for recovering at least one nitrosamine contained in a solution, comprising:
- controlling a pH value of solution in the range of from 1 to 7 and bringing the solution into contact with a solid adsorbent packed in a cartridge or column so that the solid adsorbent retains the at least one nitrosamine, the solid adsorbent comprising an adsorbent support and a substituent group combining with the adsorbent support, said adsorbent support being selected from the group consisting of silica gel, alumina, glass, kaolin, mica, talc, hydrated alumina, Wollastonite, iron powder, potassium titanate, titanium oxide, zinc oxide, silicon carbide, silicon nitride, calcium carbonate, carbon, barium sulfate, boron, ferrite, cellulose, and activated carbon, and
- said substituent group being represented by —(CH2)w—C6H4—SO3H or —Si(CH3)2—CH2—C6H4—SO3H,
- wherein w is an integer satisfying the condition of 4≤w≤1000;
- and
- eluting out the at least one nitrosamine retained by the solid adsorbent with a basic compound-containing organic solvent, wherein said eluting is performed while applying a pressure,
- wherein the organic solvent is selected from the group consisting of methanol, ethanol, 2-propanol, and acetone.
Dependencies are inferred from the claim text.