Method for determining the content of N, N-dihydroxyethyl glycine in alcohol amine solution
A bishydroxyethylglycine and alcohol amine solution technology, applied in the field of chemical detection, can solve the problems of difficult quantitative operation, weak ionization tendency, and impossibility, and achieve the effect of accurate measurement
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Embodiment 1
[0087] This embodiment provides a method for determining the content of N,N-dihydroxyethylglycine in an alcohol amine solution, the method comprising the following steps:
[0088] Glass wool is placed at the bottom of the ion exchange resin column tube, and 50 g of cation exchange resin is added.
[0089] Adopt 100mL deionized water to rinse this cation exchange resin, then add mass concentration and be 3% hydrochloric acid solution 100mL, make hydrochloric acid solution with 4hr -1 Slowly flow through the cation exchange resin. After the hydrochloric acid solution is exhausted, the cation exchange resin is rinsed with deionized water until the effluent is neutral.
[0090] Add 4 g of alcohol amine solution sample (accurate to 0.01 mg) to the resin column by decrement method. Then, 20 g of ethyl acetate was added to the resin column.
[0091] Accurately weigh a clean, dry, empty beaker and place it directly under the ion exchange resin column. Slowly open the bottom plug o...
Embodiment 2
[0116] The operation steps of this embodiment are the same as those of Embodiment 1. The difference is: the alcohol amine solution sample used in this embodiment is different from that of Example 1 (that is, the content of N,N-bishydroxyethylglycine in it is different);
[0117] The alcohol amine solution sample quality that adds in the ion exchange resin column is 3g, after adding the alcohol amine solution sample, the ethyl acetate that adds in the ion exchange resin column is 23g;
[0118] The gas chromatograph model is Agilent 7890A;
[0119] The column model is DB-1;
[0120] The column temperature is constant at 160°C;
[0121] Column flow (nitrogen) is 1.6mL / min;
[0122] Detector: The detector temperature is 280°C, the gas (hydrogen) flow rate is 1.4mL / min, and the assisted gas (air) flow rate is 14mL / min.
[0123] Measurement result:
[0124] Measure the mass fraction of N,N-bicine in the effluent for 5 times, obtain the content of N,N-bicine in the alcohol amin...
Embodiment 3
[0134] The operation steps of this embodiment are the same as those of Embodiment 1. The difference is: the alcohol amine solution sample used in this embodiment is different from that of Example 1 (that is, the content of N,N-bishydroxyethylglycine in it is different);
[0135] The type of cation exchange resin used is D113;
[0136] The alcohol amine solution sample quality that adds in the ion exchange resin column is 2g, after adding the alcohol amine solution sample, the ethyl acetate that adds in the ion exchange resin column is 23g;
[0137] The speed at which the effluent drips into the beaker is 3hr -1 ;
[0138] The column model is PH-5;
[0139] The gasification chamber temperature is 300°C;
[0140] The column temperature is programmed temperature rise (initial temperature 150°C, rising to 230°C at 10°C / min);
[0141] The column flow rate (nitrogen) was changed from 1.5mL / min to 1.8mL / min;
[0142] Detector: gas (hydrogen) flow rate is 1.8mL / min, assisted gas...
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