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8.
Product Standard
9.
Quality inspection
1) Qualitative inspection
Add 1 drop of 10% ferric chloride solution to the aqueous solution of the sample to turn purple
.
2) Assay
Weigh 0.
5g sample (accurately to 0.
0002g), place it in a 150mL Erlenmeyer flask, and add 13mL 95% ethanol
.
After dissolving, add 12 mL of water, add 3 drops of phenolphthalein indicator, and use 0.
1 mol/L NaOH standard solution to drip until the solution is reddish for 30 seconds, which is the end point
Where: V 1 ——The volume of NaOH consumed by the titration sample, mL;
V 2 ——The volume of NaOH consumed in the blank experiment, mL;
c——The molar concentration of NaOH standard solution, mol/L;
m——the mass of the sample, g
.
3) Determination of free phenol
(1) Reagents
.
0.
5mol/L NaOH standard solution; NH 3 -NH 4 Cl buffer solution: 20g NH 4 C1 dissolved in 200mL water, add 72mL ammonia and dilute to 1000mL with water; 8% potassium ferricyanide solution; 2% 4-aminoantibiotic Billing solution (use period 7d); phenol standard solution: 0.
5g phenol (accurate to 0.
0002g) dissolved in water, dilute to 500mL, shake well, then accurately draw 10mL, dilute to the mark in a 100mL volumetric flask, shake well, Equipped when used
(2) Determination
.
Standard colorimetric tube preparation: accurately weigh 0.
1000g of salicylic acid without phenol , add 2mL ethanol to dissolve it in a 25mL colorimetric tube , add 1.
Weigh 0.
1000g sample (accurately to 0.
0001g) in a 25mL colorimetric tube, add 2mL ethanol, then add 1.
4mL 0.
5mol/L NaOH standard solution, 2mL NH 3 -NH 4 C1 buffer solution
.
Then dilute with an appropriate amount of water to the same volume as the standard colorimetric tube, and add 10 drops of 2% 4-aminoantipyrine solution
.
Where: V——Volume of phenol standard solution in standard colorimetric tube, mL;
m——the mass of the sample, g
.
10.
Product use
This product has a wide range of applications in the pharmaceutical synthesis industry, dye industry, and food industry
.
In the pharmaceutical industry, drug itself is used as disinfectant antiseptic for topical skin hyperplasia and skin fungal infections; as pharmaceutical intermediates for the production of killer on, vasopressin, acetylated aspirin, sodium salicylate, salicylamide , pargyline Drugs such as sugar, niclosamide, phenyl salicylate, ethyl p-hydroxybenzoate, and bismuth subsalicylate
.
11.
(1) This product stimulates the skin and mucous membranes, has a corrosive effect, and its toxicity is lower than that of phenol.
(2) Packed in woven bags lined with plastic bags, protected from light and moisture, stored in a cool, ventilated place, and stored separately from oxides and explosives
Related links: Product performance and technical formula of salicylic acid
