Min.Order Quantity: 10 Ton
Port: Shanghai
Payment Terms: T/T
Chemwin is a leading propylene glycol dealer in China and a professional propylene glycol manufacturer. We are committed to providing customers with the best quality propylene glycol products and services. As a professional chemical enterprise, we have advanced production equipment and technology, which can efficiently produce propylene glycol and ensure the stable and reliable quality of each batch.
Our propylene glycol is widely used in coatings, paints, fibers, plastics, pesticides and other fields, and has become an indispensable and important raw material in these industries. Our products are deeply trusted and praised by customers at home and abroad, and have been steadily supplied for many years, winning a good reputation in the market.
We always adhere to the principle of customer first, and establish a good image of integrity and reliability in the propylene glycol trade to meet the growing needs of customers. We can handle orders in small or large quantities quickly and efficiently. In the industry, we deliver on time, stabilize quality and respond quickly.
Our mission is to become a world-class propylene glycol supplier and provide better service to customers. We will continue to lead the development of the propylene glycol industry and continuously improve our competitiveness. Our contributions and efforts to the industry are worthy of customers' trust and reliance. We sincerely welcome all customers to come for consultation, negotiation and establish long-term strategic cooperation with us.
1,2-propanediol is an organic compound with chemical formula C3H8O2, and is miscible with water, ethanol and various organic solvents. Under normal conditions, it is colorless viscous liquid, almost tasteless, and slightly sweet. Propylene glycol can be used as the raw material of unsaturated polyester resin, and can be used as a wetting agent in combination with glycerin or sorbitol in cosmetics, toothpaste and soap. It is used as a moisture regulator, hair leveler, antifreeze, cellophane, plasticizer and pharmaceutical industry in hair dyes.
|
Unit |
Value |
|
|
Purity |
% |
99.5 min |
|
Color |
APHA |
10max |
|
Water Content |
% |
0.05max |
|
Appearance |
- |
Colorless transparent liquid,less smell |
1. Flammable liquid. It is hygroscopic and non-corrosive to metal. It reacts with dibasic acid to form polyester, reacts with nitric acid to form nitrate ester, and reacts with hydrochloric acid to form chlorohydrin. It is heated with dilute sulfuric acid at 170 ℃ and converted into propionaldehyde. Hydroxyacetic acid, oxalic acid, acetic acid, etc. are produced by oxidation with nitric acid or chromic acid. React with aldehydes to form acetals. 1,2-propanediol is dehydrated to produce propylene oxide or polyethylene glycol.
2. The toxicity and irritation are very small, and no victims have been found. LD50: 7000-8000mg/kg by intravenous injection and intraperitoneal injection in rats, and LD50: 2800mg/kg by oral injection. However, it has also been reported that when it is added to food and drink at one time, it may cause fatal false sleep and kidney disorders.
3. It exists in tobacco leaves and smoke.
1,2-propanediol is an important raw material for unsaturated polyester, epoxy resin, polyurethane resin, plasticizer, and surfactant. Its consumption accounts for about 45% of the total consumption of propylene glycol. This kind of unsaturated polyester is widely used in surface coatings and reinforced plastics. 1,2-propanediol has good viscosity and hygroscopicity, and is widely used as hygroscopic agent, antifreeze, lubricant and solvent in food, medicine and cosmetics industry. In the food industry, 1,2-propanediol reacts with fatty acid to produce propylene glycol fatty acid ester, which is mainly used as food emulsifier; 1,2-propanediol is an excellent solvent for condiments and pigments. Due to its low toxicity, it is used as a solvent for spices and food pigments in the food industry. 1,2-propanediol is commonly used in the pharmaceutical industry as a solvent, softener and excipient for manufacturing various ointments and ointments, and as a solvent for blending agent, preservative, ointment, vitamin, penicillin, etc. in the pharmaceutical industry. Because propylene glycol has good solubility with various spices, it is also used as a solvent and softener for cosmetics. 1,2-propanediol is also used as tobacco humidifier, mildew inhibitor, lubricant for food processing equipment and solvent for food marking ink. The aqueous solution of 1,2-propanediol is an effective antifreeze. It is also used as tobacco wetting agent, mildew inhibitor, fruit ripening preservative, antifreeze and heat carrier.
1. The direct hydration method of propylene oxide is the pressurized non-catalytic hydrolysis method. It is prepared by direct hydration of propylene oxide and water at 150-160 ℃ and 0.78-0.98 MPa pressure. The reaction product is evaporated and rectified to obtain the finished product.
2. Indirect hydration of propylene oxide is prepared by indirect hydration of propylene oxide and water with sulfuric acid as catalyst.
3. Direct catalytic oxidation of propylene.
4. Use 1,2-dichloropropane as raw material:
This method has two process routes:
1、 Dichloropropane is directly hydrolyzed into propylene glycol in weak alkaline aqueous solution;
2、 Dichloropropane reacts with carboxylate to form ester, and the ester is hydrolyzed to propylene glycol.
（1） Direct hydrolysis process: add 1,2-dichloropropane, water, sodium bicarbonate and cetyltributyl phosphate bromide into the reactor, and react for 18h at 100 ℃ carbon dioxide partial pressure of 1.0MPa to obtain 80% propylene glycol. Control the feeding speed of dichloropropane, that is, the feeding speed is fast at high temperature and slow at low temperature. Example: add 60g of calcium carbonate and 150g of water into a 300mL autoclave, stir and raise the temperature to 230 ℃, and continuously add dichloropropane for 11.5h at the rate of 0.03g/(min · 100g H2O); Continue stirring at this temperature for 30min, and then quench to room temperature. The yield of propylene glycol is about 95%. When the temperature is controlled within 130-300 ℃, the yield of propylene glycol can reach more than 95% as long as the feeding rate of dichloropropane is changed accordingly.
（2） Two-step hydrolysis process: first, the raw material is reacted in a kettle reactor. After dichloropropane reaches a certain conversion rate, the material is pumped into a piston-flow reactor to continue the reaction, and finally hydrolyzed to propylene glycol. Example: add 606kg of dichloropropane into a 2m3 reactor, add 800kg of sodium acetate, 556kg of 1,2-propanediol, 10kg of acetic acid and 1kg of water, stir and heat up to 180 ℃, cool to 120 ℃ after 4h, extract the material, heat up to 180 ℃ through the preheater, pass through a 400m long, 25mm inner diameter, 230L volume piston flow reactor at a speed of 500L/h, collect the product in the second reactor, cool to room temperature, and analyze the product as 44kg of dichloropropane 334kg propylene glycol, 32kg sodium acetate, 44kg acetic acid, 234kg 1,2-diacetyloxypropane, 693kg propylene glycol monoacetate, 45kg 1-chloropropene, 547kg NaCl and 1kg water.
| Nature of inquiries | Department | Location | Telephone | |
|---|---|---|---|---|
| Sales/distribution | Sales team of propylene glycol industrial chain | China | +86-19117288062 | service@skychemwin.com |