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Method for researching smell characteristics of multi-component gas in dynamic mixing mode

A technology of dynamic mixing and mixing of gases, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of decreased odor intensity, inability to fully reflect the influence of odor grade and type, and inability to reflect the impact, etc. The effect of research speed

Pending Publication Date: 2022-01-28
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found through research that such a fixed-proportion mixed gas exhibits the same odor characteristics as the single-component trend. For example, when the mixed gas of A and B is considered to be a single substance of C, the odor studied by the olfactory diluter The law mainly expresses the law of C, and cannot reflect the influence of A and B on different dilution levels of C
Since the two substances will be diluted in the same proportion, the obtained odor intensity will also decrease at the same time, which cannot fully reflect the impact of a certain substance among multiple substances on the final odor level and type

Method used

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  • Method for researching smell characteristics of multi-component gas in dynamic mixing mode
  • Method for researching smell characteristics of multi-component gas in dynamic mixing mode
  • Method for researching smell characteristics of multi-component gas in dynamic mixing mode

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0086] Evaluation of gas preparation: Take n-butanol as an example, prepare a 10L air bag, fill the air bag with 5L nitrogen, close the valve of the air bag, inject 10 μL of n-butanol standard from the injection port of the air bag with a sampling needle, and Equilibrate at 40°C for 30 minutes. Then fill in 5L of gas and mix thoroughly to obtain a high-concentration gas as the original sample for dilution and olfactory identification.

[0087] Aging and cleaning of equipment pipelines: Due to the adsorption of odorous gases, high-temperature aging is required for the gas circuit after each test. The aging temperature is 65°C and the time is 5 minutes. After aging, clean the pipelines with pure nitrogen and purge for 2 minutes.

[0088] Equipment dilution process: Connect more than two groups of mixed gases to the multi-channel dynamic olfactory diluter, and set the dilution ratio of each gas channel through the instrument, such as 4000 times for A channel and 3000 times for B ...

Embodiment 1

[0107] The research on the concentration and odor level of the two single substances is the same as in Comparative Example 1. The relationship between the subjective odor level of acetic acid and the objective concentration is D=0.9837.logC+4.0726, and the relationship between benzothiazole obtained in the same way is D=0.9837.logC+3.4096.

[0108] According to the dilution method of this standard, connect two bags of gas to the A channel and B channel of the multi-channel olfactory diluter. The original concentration of the A air bag is 116ng / mL, and the original concentration of the B air bag is 275ng / mL. Dilute and combine the two bags of gas according to the proportions in Table 4 for odor identification. Through the dilution ratios in the table, 16 combinations can be obtained. The olfactory personnel conduct the identification and record the results, as shown in Table 5

[0109] Table 4 Two-component dilution ratio table

[0110]

[0111] Table 5 Odor rating results o...

Embodiment 2

[0117] The research on the concentration and odor level of multiple single substances is the same as that in Comparative Example 1. For each substance, a fitting line of D=a logC+b can be obtained, which together constitute an odor estimation map, as shown in Figure 9 shown.

[0118] According to the dilution method of this standard, connect the four bags of gas to the channels A to D of the multi-channel olfactory diluter. The original concentration of the A bag is 116ng / mL, and the original concentration of the B bag is 275ng / mL. The original concentration of airbag C is 305ng / mL, and the original concentration of airbag D is 122ng / mL. The two bags of gas are diluted and combined according to the ratio in Table 6 for odor identification. Through the dilution ratio in the table, 16 kinds can be obtained Combination, the olfactory staff conducts the olfactory identification and records the olfactory identification results, as shown in Table 7.

[0119] Table 6 Four-component d...

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Abstract

The invention provides a method for researching smell characteristics of multi-component gas in a dynamic mixing mode. The method comprises the following steps of S1, preparing a single-component standard gas for a plurality of single substances by using a standard solution and nitrogen; S2, researching the relationship between the odor grade and the concentration of the plurality of single-substance standard gases obtained in the step S1 through a sniffing dilution instrument; and S3, mixing the plurality of single-substance standard gases obtained in the S1, exporting the mixed gas to a sniffing port, and judging the relationship of the mixed gas. According to the method for researching the smell characteristics of the multi-component gas in the dynamic mixing mode, a problem that the concentration ratio of the smell substances is fixed is solved, the concentration of each smell substance in each test can be set at will, the research speed is greatly increased, and the requirement for consumption of smell bag consumables is reduced.

Description

technical field [0001] The invention belongs to the field of odor detection, and in particular relates to a method for studying the odor characteristics of multi-component gases in a dynamic mixing mode. Background technique [0002] When studying the law of odor levels in the traditional way, micro-sampling needles are used to inject high-purity liquids into fixed-volume air bags, and nitrogen shocks are used to mix and prepare high-concentration standard gases to be evaluated. Long-term evaluation of odors will reduce the sensitivity to odors. Sensitivity, from the maximum dilution ratio of 14000 times, gradually diluted to 1 times. There is a proportional relationship between the concentration of the dilution gas and the concentration of the standard gas, as shown in formula (1). [0003] [0004] In the formula: C 0 - standard gas concentration; [0005] C i - standard gas concentration; [0006] k—dilution ratio; [0007] At the dilution olfactory mouth, strict...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0001
Inventor 姚谦王焰孟李传杰刘亚林胡俊艳李骊璇武金娜冯世豪李晶王崇
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD
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