... in North China, our factory is the biggest 2-Ethyl Anthraquinone factory, which is a government-owned factory with a history of over ... 20 years. Based on our advanced production techniques and good products quality, we have attained the ... of ISO9001-2000 Q.C. After the rennovation of the production techniques, the annual output of the 2-Ethyl anthraquinone crude slice has ...