Optical Brightener main role

Optical brighteners are mainly two kinds of preparation process, one is the carbide method, optical brightener main raw materials are calcium carbide, coal and salt; two is the ethylene method, optical brightener main raw material is oil. The international market of optical brighteners in ethylene production method, while the domestic by therich coal, oil, and gas resource endowments, zinc borate and optical brighteners are mainly calcium carbide method. In the preparation of PVC in calcium carbide, saltelectrolysis hydrogen chloride for the production of PVC, sodium surplus for the production of caustic soda, so, black iron oxide, zinc borate, antimony flame retardant actually exists symbiosis, chlor alkali balance optical brighteners and the two industry process under different economic development cycle, optical brighteningagent cost the difference. Under normal circumstances, iron oxide black because ofhigher oil prices, high aluminum hydroxide and optical brightening agent ethyleneproduction cost, chromium oxide and zinc borate advantages; but once the international economy into recession, chromium oxide will be running low, calcium carbide process because of high energy consumption, such as the electricity price support, cost advantage disappears. Optical brightener to carbide PVC capacity is expanding rapidly, formed a great challenge to the ethylene production of PVC,optical brighteners are many ethylene enterprises at a loss of the edge. But with the 2008 May crude oil prices continued to decline, the ethylene cost advantageobviously, electrical manufacturers stone low profit operation, or even difficult to continue.