Pure salicylic acid of the properties

Physical properties of pure salicylic acid appearance and properties: white needle-like crystals or hairy crystalline powder. Solubility: Easily soluble in ethanol, ethylene, dilute chlorine, slightly water, and dissolves in boiling water. Melting point: 159°C Boiling point: 211℃, sublimation at 76℃. Pure salicylic acid chemical properties Stable at room temperature. 

Has the generality of part of the acid. It has obvious skin and mucous membranes, which can react with the tissues, so it has a corrosive effect. The toxicity is weaker than phenol, but large consumption can cause vomiting, appetite, headache, sweating, skin rash, shortness of breath, acidosis and excitement. Its aqueous solution is acidic. Has antipyretic and analgesic effects. Quick food solution, dye disinfectant, etc. The LD50 is 1.5～2.0g/kg; it has a moderate irritation effect and is toxic through skin and oral dose. The low lethality is estimated to be about 5 to 15g, and some people think that it is 20 to 30g. Poisoning can occur when the blood concentration is 55-85%, 80-11mg% is moderately poisoned, 125-145mg% is severely poisoned, and 160-180mg% can cause death. 

The role and use of pure salicylic acid

 1. Standards for alkalimetry and iodometric titration. Indicator indicator, complex indicator. 

 2. Rubber is used in rubber industry as rubber ballistics and production of adsorbents and earphones. 

3. The tool is matched with indicator and masking agent. Prominence and protection of titanium, dispersant, and tungsten plasma.

 4. Salicylic acid is used as an additive in some weakly acidic aqueous solutions, and can also be used as a complexing agent for paint or electroless plating. 

5. Cosmetic swelling. Mainly used in watery foods such as toilet water, prickly heat water, quinine water. In addition to the effect of phlegm, it also has the functions of removing sweat and odor, relieving itching and swelling, relieving pain and inflammation. 

6. It is mainly used as a raw material for the pharmaceutical industry to prepare aspirin, salicylic apricot, salicylic acid, Zhitongling, salicylidene blood, and anti-67 drugs. In the dye industry, it is used to prepare media for dyeing pure yellow, direct brown 3GN, solar cell yellow, etc. It also includes rubber floor equipment and disinfection. 

7. The accelerator of dye curing agent can also be used as raw material. It can be processed to prepare salicylic acid, salicylic acid and other surface adsorption fragrances. Dyestuff industry pigments are raw materials for the preparation of direct dyes and dyes and dyes. Rubber anti-scorching agent, disinfectant, etc. 

8. A small amount is used in important and important formulations of animal flavors in food. Used in small amounts in food, industry plays a role. It is the raw material of medicine. volume_upcontent_copyshare