Foreign companies producing o-phenylphenol are mainly concentrated in Japan, the United States and Germany. The industrial production process and core technology of o-phenylphenol are controlled by Bayer of Germany, Sanko of Japan, and Dow Chemical of the United States. The Dow Chemical Company of the United States is the world's earliest manufacturer of synthetic o-phenylphenol, mainly using chlorobenzene as raw material; Bayer Company of Germany mainly uses cyclohexanone as raw material to produce o-phenylphenol through dimer dehydrogenation.
The production process of OPP by cyclohexanone condensation dehydrogenation method of Bayer Company in Germany is shown in Table 1 below.
Table 1
Project
Bayer Company
Cyclohexanone unit consumption
1.5-1.55
p>Cyclohexanone condensation catalyst
Concentrated sulfuric acid
Wastewater
There is wastewater
Dehydrogenation catalyst usage time
p>
More than 16,000 hours
Utilization of by-product hydrogen
Complete utilization
O-phenylphenol content
≥99.5%
Color of o-phenylphenol
White flaky crystals
Production scale (t/a)
20000 o-phenylphenol in my country Production began in the late 1970s. Tianjin Weijin Chemical Plant, Shanghai Dyestuff Chemical Plant, Dalian Chemical Research and Design Institute and other units recover o-phenylphenol from the distillation residue of phenol produced by the sulfonation method, and the extraction purity can reach 98%. However, due to backward technology and limited raw material sources, there are not many domestic companies using this technology to produce, and the output is limited. As the domestic phenol production equipment by sulfonation method is shut down and converted, the output of o-phenylphenol is getting less and less. Domestic demand mainly relies on imports, which severely restricts the development of my country's new flame-retardant fibers and materials, LED luminous matrices, fruit and vegetable preservation, plastic heat stabilizers and other industries.
In the early 1990s, as the demand for o-phenylphenol gradually increased at home and abroad, my country launched an o-phenylphenol development boom, and many domestic scientific research institutions began to produce o-phenylphenol. The study of craftsmanship. From 1992 to 1994, the Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences conducted research on the polymerization and dehydrogenation of cyclohexanone to synthesize o-phenylphenol; from 1993 to 1995, the Beijing Research Institute of Chemical Industry conducted research on the polymerization and dehydrogenation of cyclohexanone to synthesize o-phenylphenol. According to the research, a production line was invested and built in Nanjing, but due to the high cost, the product could not be sold, and it is now in a semi-stop production state; Yancheng Huaye Pharmaceutical Chemical Co., Ltd. has conducted technical research and market demonstration on OPP since 1998. The OPP laboratory was established in 2000. In 2001, Yancheng Huaye Pharmaceutical Chemical Co., Ltd. cooperated with two domestic colleges and universities to successfully develop a new process for the synthesis of o-phenylphenol via the cyclohexanone route, which has greatly improved the catalyst activity. Innovatively, the palladium ZSM-5 molecular sieves Pd/H-ZSM-5 and Pd/Mg-ZSM-5 produced by the ion exchange method are used as catalysts. The activity decay rate is significantly reduced during the synthesis of o-phenylphenol, solving the problem of catalysts in this process. activity problem. In 2003, it was the first in China to build a 200t/a OPP pilot production device and pass the provincial scientific and technological achievements appraisal. In 2004, it established the Yancheng City OPP Engineering Technology Research Center and devoted itself to OPP industrialization research and OPP application research, achieving this for the first time in China. large-scale industrial production. The construction of a 10,000t/a o-phenylphenol project will start in 2005. With the implementation of the 10,000t/a OPP project of Yancheng Huaye Pharmaceutical Chemical Co., Ltd., my country's current "three In the market competition pattern of "sharing the world", chlorine and bromine series flame retardant materials in areas closely related to human health will accelerate their withdrawal from the market. The technological upgrading of the flame retardant material industry is unstoppable, and flame retardant materials will "share the world".
OPP is an important new fine chemical and an important chemical intermediate. It is widely used as a preservative for food, fruits and vegetables. It is widely used in Europe, America and Japan to preserve citrus, which can reduce rot to a minimum. It is also allowed to be used in vegetables, such as apples, pears, pineapples, and honey in the United States, Britain, Japan and other countries. Preservation of peaches, strawberries, etc. This product is a powerful bactericide, disinfectant, antiseptic and preservative, tuberculocide, microbial resistant, and antifungal agent.
The U.S. Environmental Protection Agency (EPA) allows the use of nearly 200 varieties of antiseptic soaps, sterilizing and deodorizing cleaning agents, and antiseptic preservatives with o-phenylphenol or its sodium salt as the main ingredient, and considers such products to be non-toxic. In addition, it is also used in cellulose and protein materials, including wood, leather, paper antiseptics, plasticizers, flame retardants and other products. It should be pointed out that o-phenylphenol for the above uses is limited to those produced by the cyclohexanone process. o-phenylphenol produced by other processes cannot be used for the above products.
Qingdao Xinshuo Fine Chemical Co., Ltd., a joint venture between Taiwan Sanhe Chemical in mainland China and the Qingdao Chemical Industry Research Institute, also successfully developed and matured this product in 2006, reaching the level of Japan's Sanko, and passed Taiwan The parent company exports to European and American countries.