Sunday, November 9, 2014

Notes For Toluene Transport

Toluene could only transport by enterprises owned tanker on the railway. At the same time, they must apply to the relevant departments for approval. The transport vehicle which used for transporting toluene should be equipped with the varieties and number of fire fighting equipment and leakage emergency treatment equipment.

In summer days, we suggest people transport the toluene in the morning or evening. Groove which is used for transporting toluene had better set hole partition to reduce the shock and even let it not produce static electricity. Don’t mixed with oxidant or food chemicals. Toluene transit should prevent insolation, drench, anti high temperature. Keep far away from fire, heat source and the high temperature region. The shipment of vehicle exhaust pipe must be equipped with fire resistance device. Don’t handle them with machine equipment and tool which is easy to produce sparks. Driving according the prescribed route in the highway transportation, don’t stay in the residential areas and densely populated area.

Toluene is often storage in a cool and ventilated warehouse. It is usually kept far away from fire and heat resource. The room temperature can not be higher than 37℃ and the containers must be sealed.




Sunday, October 26, 2014

How To Storage Trichloroethylene

Trichloroethylene is a good solvent. It is always regarded as cleaning agent and extracting agent. Trichloroethylene is used as an anthelmintic drug for producing four vinyl chloride. But it is used for veterinary anthelmintics for producing hexachloroethane.


Trichloroethylene is storage in the warehouse which is shade and ventilation. At the same time, you should keep far away from fire and heat source. The room temperature can not higher than 25℃ and relative humidity can not more than 75%. Package of trichloroethylene is required to seal up and it could not contact with air. Trichloroethylene should be separate from oxidizing agent, reducing agent, alkali, metal powder and edible chemicals. Don’t put them together. There must be varieties kinds and number of fire fighting equipment.

Worker who operate the trichloroethylene should wear self filter mask and protecting glass, antivirus working clothes and anti chemical gloves. People would like to use explosion-proof ventilation systems and equipment in order to prevent the steam leakage in the air of workplace. Workers should pay more attention while carrying trichloroethylene to avoid damaging the packaging and containers. Sometimes the empty containers may remain harmful substances.




Friday, October 10, 2014

Application Of Good Dimethylformamide

Dimethylformamide is widely used as a chemical raw material and it is often regarded as a good solvent. In the process of synthetic fiber of wet spinning and polyurethane, dimethylformamide is necessary. In daily life, people is habit to use dimethylformamide to remove the paint. Some pigment who always has the characteristic of dye because that can dissolve pigment which with some low solubility.

Dimethylformamide can used as a gas absorbent in the petroleum chemical industry. Certainly it is also an important intermediate in organic reaction. Dimethylformamide can be used for the production of chlordimeform in pesticide industry. It can be used in to form many drugs in the pharmaceutical industry. Such as Iodine amine pyrimidine, iodine glycosides, antitumor ammonia acid, tranexamic acid, dexamethasone, megestrol acetate and chlorpheniramine sensitivity. It has catalysis in the reaction of hydrogenation, dehydrogenation, dehydration and dehydrohalogenation.

People must evacuate quickly to a safe area once leakage. Experts always suggest that emergency treatment staff wear self positive pressure respirator and protective clothing for firefighters. Of course, people could use sand or other non combustible material to absorption if there is a small amount of leakage.

Dimethylformamide

Tuesday, September 23, 2014

Cyclohexanone Manufacture Process

High concentrations of cyclohexanone vapors have narcotic which have inhibitory effect on central nervous system. At the same time, cyclohexanone having a stimulating effect to skin and mucous membrane.  As we known, there are three method to make cyclohexanone. They are phenol method, cyclohexane oxidation mehod and hydrogenation of benzene oxidation method.

Phenol method usually use nickel as catalyst. Adding hydrogenation to the phenol, we can get cyclohexanol. Then using the zinc as catalyst to move the hydrogenation, so that we can get cyclohexanone. Cyclohexane oxidation method is always regarded cyclohexane as material and after a series of treatment, we will get qualified products.

High concentrations of cyclohexanone poisoning will damage the blood vessel and cause cardiac muscle, lung, liver, spleen, kidney and brain lesions. Even it may cause large coagulation necrosis. Then absorbed by skin. Finally there will be tremors anesthesia, reduce temperature and until to death. Cyclohexanone is widely used for coating producing, synthetic resin dissolved and preparing paint stripping agent. It also could be regarded as penicillin, tetracycline production solvent. Cyclohexanone is an important chemical raw material for a wide range of application. It is mainly used as intermediate of caprolactam, adipate acid and its salt.  It has good dissolving capacity, little poison and relatively low price.




Wednesday, September 10, 2014

Methylene Chloride In Different Industries

Methylene chloride is widely used in many industries. It can not only used for chemical industry, but also applicated in pharmaceutical industry. Methylene chloride has the advantages of strong dissolving capacity and low toxicity. It is widely used for safety film and polycarbonate. It is also regarded as paint solvent, metal degreasing agent, aerosol sprays, polyurethane foaming agent, release agent, paint remover and correction fluid.

Methylene chloride is a colorless liquid. It can used as a reaction medium in pharmaceutical industry and also can make into oil dewaxing solvents, aerosol propellants and synthetic organic extractant. On the research of plant genetic, methylene chloride can used as solvent and mutagens.

In China, methylene chloride is mainly used for film production and medical field. Consumption of film production accounted for 50% of total consumption. Medical field only account for 20%. Cleaning agent and chemical industry consumption accounted for 20% of the total consumption. Generally speaking, methylene chloride is synthesis of chlorinated with methane. Methane chloride by chlorination can get a pile of mixture which has four kinds. Because of their boiling point distance is relatively large, people can separation and purification through ordinary fractionation technique.


Monday, August 25, 2014

Xylene Migration And Transformation

Xylene is mainly used in chemical industry. The industries who use xylene more are organic solvents and synthetic medicine. Such as paint, resins, dyes, detergents, detergent, pesticide, dynamite and so on. Xylene is also one of the components for aviation fuel.

Xylene can discharged into water bodies with the industrial wastewater in the process of industrial production. But there is no persistent pollution to water because that the xylene has strong fugacity in the water.

Generally speaking xylene will degrade in the environment. Xylene transfer speed is slower than the volatile speed in aqueous solution. The xylene will also be photolysis after volatile into the air. The photolysis process is the main migration and transformation process. The xylene harm is not badly than we imagine. The xylene incoming and metabolism to human body is very fast. However the xylene in the human body could excreted totally if it stop to contact with xylene in 18 hours. At the same time, it has no effect on human health. So not contacting or incoming the xylene will not affect human health unduly. Xylene is belong to moderate flammable items and xylene vapor is heavier than the air. So xylene often close to the ground and spread along the ground when burning.


Monday, August 11, 2014

Production Technology In Aniline Industry

Aniline is regarded as an organic intermediates. It is widely used in synthetic materials, rubber additives,dyes,pigments,pharmaceuticals and other organic chemical products. Recent years, with the demand of global polyurethane raw material MDI growth, it has become the main consumer areas of aniline. According to statistics, global aniline capacity has been reached 3.773 million t/a in 2004, annual output is 2.315 million tons and the apparent consumption was 2.24 million tons.

Aniline industry has began in 1857. Aniline industry adopt nitrobenzene iron reduction method. This method needs big equipment and also in serious corrosion, big iron consumption, serious pollution. Catalytic hydrogenation of nitrobenzene method instead of it until 1950s. At present, this method has accounted for 85% of the total capacity of aniline. Phenol ammoniation is occupied about 10% and iron powder reduction method is occupied about 5%.

Nitrobenzene iron reduction method is using intermittent production and reduction nitrobenzene into aniline through hydrochloric acid medium under about 100 ℃. There are many devices adopt this method in China because that method can  byproduct of iron oxide pigments. The rapid development of MDI and other downstream products brought hitherto unknown opportunities to the development of aniline industry. The experts recommended that small and medium sized enterprises must develop Adiabatic Nitration Technology with independent intellectual property rights, reduce energy consumption and cost in order to improve China’s aniline industry competitiveness in the international market.