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7.
Product Standard
8.
Quality inspection
1) Assay
(1) Reagents
.
Acetic anhydride and pyridine mixture ( acetic anhydride : pyridine =1:5, volume ratio); cresol red indicator: 0.
1% aqueous solution, neutralized with 0.
(2) Determination
.
Weigh 1-1.
3g of sample (weigh to 0.
(3) Calculation
.
In the formula: V 1 ——the volume of sodium hydroxide standard solution consumed in the blank experiment, mL;
V 2 ——The volume of sodium hydroxide standard solution consumed for titrating the sample, mL;
c——The molar concentration of sodium oxygen oxide standard solution, mo/L;
G—The mass of the sample, g
.
(4) Description
.
①The acetic anhydride and pyridine mixture must be freshly prepared
.
②The acetic anhydride and pyridine used must be of high purity, and must be sealed after use to prevent moisture absorption
.
2) Determination of aldehyde content
(1) Reagents
.
Hydroxylamine hydrochloride solution: Dissolve 50g hydroxylamine hydrochloride in 150mL water, dilute with 95% ethanol to 1000mL, and dissolve 0.
04g bromophenol blue indicator; sodium oxide: 0.
1mol/L standard solution; 95% ethanol
.
(2) Determination
.
Weigh 20g±0.
1g sample (or draw 25mL sample) into a 300mL Erlenmeyer flask, accurately draw 10mL hydroxylamine hydrochloride solution and add it to the above solution, shake it well, and place it for 1h
Add 20mL 95% ethanol, titrate with 0.
1mol/L sodium hydroxide standard solution until the color of the sample changes from yellow to green, which is the end point, and do a blank experiment at the same time
.
(3) Calculation
.
Aldehyde content:
In the formula: V 1 ——The volume of sodium hydroxide standard solution consumed by the titration sample, mL;
V 2 ——The volume of sodium hydroxide standard solution consumed in the blank experiment, mL;
c——The molar concentration of sodium oxygen oxide standard solution, mol/L;
G-sample quality, g;
V——The volume of the sample taken, mL;
d——The density of the sample, g/cm 3
.
3) Qualitative inspection
(1) Reagents
.
1,4-Dioxane; cerium ammonium nitrate reagent: take 2g of cerium ammonium nitrate [(NH 4 ) 2 Ce(NO 3 ) 6 ], add 5mL 2mol/L nitric acid , heat to dissolve cerium ammonium nitrate, let cool, This reagent is yellow
.
(2) Determination
.
① The appearance should be a colorless, slightly viscous liquid
.
②Take 0.
5mL of cerium ammonium nitrate reagent into a test tube, add 3mL of 1,4-dioxane, if the precipitate precipitates, add 3 to 4 drops of water to make the solution clear, then add 5 drops of sample, and it will turn red after shaking
.
9.
Product use
Octanol itself is a useful solvent, defoamer, dispersant, lubricant, and its series of products are mainly plasticizers such as dioctyl phthalate and octyl acrylate
.
In China, it is mainly used for the preparation of diisooctyl phthalate and aliphatic dibasic acid isooctyl ester plastics; it is also used as a raw material for synthetic lubricants and antioxidants
.
2-Ethylhexanol is also a solvent and a good defoamer, and can also be used in paper sizing, photography, latex, textile printing and dyeing
.
10.
Security measures
(1) This product is slightly toxic, and good ventilation in the workshop should be maintained
.
Pay attention to the airtightness of the equipment, and the operator should wear labor protection equipment
.
(2) This product is flammable, and may cause burning hazard when exposed to open flames, high heat, and oxidants.
Keep it away from fire and heat sources, prevent sun exposure, and store it separately from oxidants
.
In case of fire, use sand, dry powder, foam, carbon dioxide to extinguish the fire
.
(3) Packed in galvanized iron drums, should be marked "flammable", and stored in a low-temperature, ventilated warehouse
.
Related links: Product performance and production principle of 2-ethylhexanol